阅读说明：本技术 一种填充粉煤灰基地聚合物的半柔性沥青路面材料及其制备方法 (Semi-flexible asphalt pavement material filled with fly ash-based polymer and preparation method thereof ) 是由 白桃 李成 李元元 蒋欣 毛春光 窦衍竹 王刚 管世玉 黄正红 于 2021-10-20 设计创作，主要内容包括：本发明属于路面工程材料技术领域,具体公开了一种填充粉煤灰基地聚合物的半柔性沥青路面材料,它由大孔隙沥青混合料和粉煤灰基地聚合物灌浆料组成,二者所占体积百分比为：大孔隙沥青混合料70-80％,灌浆料20-30％；所述大孔隙沥青混合料以矿料、填料和基质沥青为主要原料制备而成；灌浆料以粉煤灰、水玻璃、水、氢氧化钠、防沉降性铝酸酯ASA为主要原料制备而成。本发明首次提出采用粉煤灰基地聚物灌浆材料替换传统的水泥基灌浆材料,所得半柔性沥青路面材料具有高温抗车辙能力、水稳定性强、耐久性和疲劳寿命长等优点,且大孔隙沥青混合料与灌浆料结合性好、节能环保,可实现固体废弃物循环利用,具有重要的经济和环境效益。(The invention belongs to the technical field of pavement engineering materials, and particularly discloses a semi-flexible asphalt pavement material filled with a fly ash-based polymer, which consists of a macroporous asphalt mixture and a fly ash-based polymer grouting material, wherein the volume percentages of the two materials are as follows: 70-80% of macroporous asphalt mixture and 20-30% of grouting material; the macroporous asphalt mixture is prepared by taking mineral aggregate, filler and matrix asphalt as main raw materials; the grouting material is prepared by using fly ash, water glass, water, sodium hydroxide and anti-settling aluminate ASA as main raw materials. The invention firstly proposes that the fly ash-based geopolymer grouting material is adopted to replace the traditional cement-based grouting material, the obtained semi-flexible asphalt pavement material has the advantages of high-temperature anti-rutting capability, strong water stability, long durability and fatigue life, and the like, and the macroporous asphalt mixture and the grouting material have good bonding property, are energy-saving and environment-friendly, can realize the recycling of solid wastes, and have important economic and environmental benefits.)

1. The semi-flexible asphalt pavement material filled with the fly ash-based polymer is characterized by comprising a macroporous asphalt mixture and a fly ash-based polymer grouting material, wherein the volume percentages of the macroporous asphalt mixture and the fly ash-based polymer grouting material are as follows: 70-80% of macroporous asphalt mixture and 20-30% of coal ash based polymer grouting material; the coal ash-based polymer grouting material is prepared from the main raw materials of coal ash, water glass, water, sodium hydroxide and anti-settling aluminate.

2. The semi-flexible asphalt pavement material as claimed in claim 1, wherein the fly ash based polymer grouting material comprises the following components in parts by weight: 60-80 parts of fly ash, 15-30 parts of water glass, 5-10 parts of water, 3-10 parts of sodium hydroxide and 3-10 parts of anti-settling aluminate.

3. The semi-flexible asphalt pavement material according to claim 1 or 2, wherein the fly ash is class I fly ash; the modulus of the water glass is 3.2-3.4, and the solid content is 32-35%.

4. The semi-flexible asphalt pavement material according to claim 1, wherein the macroporous asphalt mixture has a interconnected porosity of > 20% and a stability of > 3.5 kN.

5. The semi-flexible asphalt pavement material according to claim 1, wherein the macroporous asphalt mixture comprises the following components in parts by weight: 90-95 parts of mineral aggregate, 2-4 parts of filler and 2-5 parts of matrix asphalt.

6. The semi-flexible bituminous pavement material according to claim 5, characterized in that said mineral aggregate is limestone, basalt, granite or diabase; the filler is limestone mineral powder; the mixture gradation range of the mineral aggregate and the filler is as follows: the sieve has the advantages that the 26.5mm sieve mesh passing rate is 100%, the 19mm sieve mesh passing rate is 90-100%, the 16mm sieve mesh passing rate is 50-80%, the 13.2mm sieve mesh passing rate is 40-70%, the 9.5mm sieve mesh passing rate is 15-60%, the 4.75mm sieve mesh passing rate is 3-20%, and the 0.075mm sieve mesh passing rate is 1-3%.

7. The semi-flexible asphalt pavement material according to claim 1, wherein the preparation method of the coal ash based polymer grouting material comprises the following steps:

1) adding the weighed raw materials into water glass, water and sodium hydroxide in sequence, stirring, and standing at room temperature for 1-2 days;

2) adding the weighed fly ash and the anti-settling aluminate into the mixed solution obtained in the step 1), and uniformly stirring to obtain the fly ash-based polymer grouting material.

8. The semi-flexible asphalt pavement material according to claim 1, wherein the preparation method of the macroporous asphalt mixture comprises the following steps:

1) respectively heating the mineral aggregate, the filler and the matrix asphalt, wherein the heating temperature of the mineral aggregate and the filler is 145-150 ℃, and the heating temperature of the matrix asphalt is 140-145 ℃;

2) and putting the mineral aggregate, the matrix asphalt and the filler into a mixing pot with the temperature of 145-150 ℃ in sequence, and continuously stirring at constant temperature to obtain the macroporous asphalt mixture.

9. The method for producing a semi-flexible asphalt pavement material filled with a fly ash based geopolymer according to any one of claims 1 to 8, comprising the steps of: under the vibration condition, the fly ash based geopolymer grouting material is poured into a macroporous asphalt mixture, wherein the fly ash based geopolymer grouting material accounts for 20-30% of the volume percentage, and curing is carried out in a curing box, so as to obtain the semi-flexible asphalt pavement material filled with the fly ash based geopolymer.

Technical Field

The invention belongs to the technical field of engineering materials, and particularly relates to a semi-flexible asphalt pavement material filled with a fly ash-based polymer and a preparation method thereof.

Background

With the continuous development of the transportation industry of China, the traffic volume and the traffic axle load are increased day by day, so that the requirement on the performance of the pavement material is increased day by day. Because asphalt belongs to a viscoelastic temperature sensing material, track diseases are easily caused on an asphalt pavement under the repeated action of vehicle loads at high temperature in summer, particularly in an entrance and an exit of a highway toll station, a route intersection, a long and large longitudinal slope road section and the like, the track diseases on the pavement are more serious due to frequent braking and starting operations of vehicles, and the driving comfort and the safety are greatly influenced. Compared with asphalt pavement, the cement concrete pavement does not have the problems, but the driving comfort is seriously influenced due to the existence of the joint; meanwhile, the cement concrete pavement has the defects of complex construction, difficult later maintenance, slow open traffic and the like. The development requirements of diversification and functionalization of the pavement are met, and the novel semi-flexible pavement with respective advantages of the asphalt pavement and the cement concrete pavement is produced.

The traditional semi-flexible asphalt pavement material is characterized in that a cement-based grouting material is poured into a matrix asphalt mixture, and the material strength is formed by mutual embedding and extruding action between matrix asphalt mixture aggregates and cement-based slurry, so that the load resisting capacity of a pavement structure layer is improved, and the pavement has the characteristics of rigidity and flexibility. Although the traditional semi-flexible asphalt pavement material has excellent high-temperature performance, can resist vehicle load and greatly reduce pavement track diseases, because the grouting material belongs to a cement-based material, a large amount of heat energy can be released during hydration reaction, the volume is expanded, and the temperature is reduced after hardening to generate temperature shrinkage and dry shrinkage; meanwhile, the conventional cement-based grouting material usually needs to be added with standard sand to improve the pavement performance of the mixture, so that the preparation cost is increased to a certain extent and certain influence is caused on the environment.

Disclosure of Invention

The invention mainly aims to provide a semi-flexible asphalt pavement material filled with a fly ash-based polymer, which has the advantages of good high-temperature anti-rutting property, strong water stability, long durability, long fatigue life and the like, and the macroporous asphalt mixture has good binding property with grouting material, small temperature shrinkage and dry shrinkage cracks, energy conservation and environmental protection, can realize the cyclic utilization of solid wastes, does not need to further introduce fine aggregates such as sand and the like, and has good economic and environmental benefits.

In order to achieve the purpose, the invention adopts the technical scheme that:

a semi-flexible asphalt pavement material filled with fly ash-based polymer comprises a macroporous asphalt mixture and a fly ash-based polymer grouting material, wherein the volume percentage of the macroporous asphalt mixture and the fly ash-based polymer grouting material is as follows: 70-80% of macroporous asphalt mixture and 20-30% of coal ash based polymer grouting material; the coal ash-based polymer grouting material is prepared from the main raw materials of coal ash, water glass, water, sodium hydroxide and anti-settling aluminate.

In the scheme, the macroporous asphalt mixture comprises the following components in parts by weight: 90-95 parts of mineral aggregate, 2-4 parts of filler and 2-5 parts of matrix asphalt.

In the scheme, the mineral aggregate can be selected from limestone, basalt, granite or diabase and the like; the filler can be selected from limestone mineral powder and the like; the mixture gradation range of the mineral aggregate and the filler is as follows: the sieve has the advantages that the 26.5mm sieve mesh passing rate is 100%, the 19mm sieve mesh passing rate is 90-100%, the 16mm sieve mesh passing rate is 50-80%, the 13.2mm sieve mesh passing rate is 40-70%, the 9.5mm sieve mesh passing rate is 15-60%, the 4.75mm sieve mesh passing rate is 3-20%, and the 0.075mm sieve mesh passing rate is 1-3%.

In the scheme, the base asphalt can be No. 50, No. 70 or No. 90 asphalt and the like.

In the scheme, the preparation method of the macroporous asphalt mixture comprises the following steps:

1) respectively heating the mineral aggregate, the filler and the matrix asphalt, wherein the heating temperature of the mineral aggregate and the filler is 145-150 ℃, and the heating temperature of the matrix asphalt is 140-145 ℃;

2) and putting the mineral aggregate, the matrix asphalt and the filler into a mixing pot at the temperature of 145-150 ℃ in sequence, continuously stirring at constant temperature, and compacting to obtain the macroporous asphalt mixture.

In the scheme, the communication porosity in the macroporous asphalt mixture is more than 20%, and the stability is more than or equal to 3.5 kN.

In the scheme, the coal ash based polymer grouting material comprises the following components in parts by weight: 60-80 parts of fly ash, 15-30 parts of water glass, 5-10 parts of water, 3-10 parts of sodium hydroxide and 3-10 parts of anti-settling aluminate.

Preferably, the mass ratio of the fly ash to the anti-settling aluminate is (12-15): 1

In the scheme, the fly ash is I-grade fly ash, the fineness is not more than 18%, and the density is 2.5-2.7g/cm³(ii) a The modulus of the water glass is 3.2-3.4, and the solid content is 32-35%; the sodium hydroxide is white flaky particles with the density of 2.1-2.3g/cm³(ii) a The anti-settling aluminate ASA has a melting point of 60-90 ℃ and is white.

In the scheme, the preparation method of the coal ash based polymer grouting material comprises the following steps:

1) adding the weighed raw materials into water glass, water and sodium hydroxide in sequence, stirring, and placing the prepared solution in a constant-temperature water bath (room temperature) for 1-2 days;

2) adding the weighed fly ash and the anti-settling aluminate into the mixed solution obtained in the step 1), and uniformly stirring to obtain the fly ash-based polymer grouting material.

In the scheme, the initial setting time of the coal ash based polymer grouting material is more than or equal to 120min, the compressive strength of the cured material for 7d is more than or equal to 25MPa, and the flexural strength of the cured material for 7d is more than or equal to 3 MPa.

According to the preparation method of the coal ash based geopolymer filled semi-flexible asphalt pavement material, the coal ash based geopolymer grouting material is poured into a macroporous asphalt mixture under a vibration condition, wherein the coal ash based geopolymer grouting material accounts for 20-30% of the volume percentage, and curing is carried out in a curing box, so that the coal ash based geopolymer filled semi-flexible asphalt pavement material is obtained.

Compared with the prior art, the invention has the beneficial effects that:

1) the invention firstly proposes that the fly ash-based geopolymer grouting material is adopted to replace the traditional cement-based grouting material, and anti-settling aluminate is further introduced, under the action of the fly ash-based geopolymer grouting material and the coupling agent anti-settling aluminate, the bonding property between the obtained grouting material and a macroporous asphalt mixture matrix can be further improved, and simultaneously the good high-temperature anti-rutting capability, low-temperature anti-cracking performance, strong water stability, durability and service life of the obtained semi-flexible asphalt pavement material are effectively considered, and particularly on the basis of no need of introducing fine aggregates such as sand and the like, a higher freeze-thaw splitting ratio can be obtained, and the high-temperature anti-rutting performance and water stability performance are further shown, the technical requirements on asphalt pavements by relevant specifications are far exceeded, and the application is wide;

2) the invention adopts the fly ash-based geopolymer to replace the cement-based material, can further effectively improve the service performance of the semi-flexible asphalt pavement material on the basis of realizing the recycling of solid wastes, and has important economic and environmental benefits.

Detailed Description

The following is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the invention is not to be restricted except in light of the above teachings, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

In the following examples, the macroporous asphalt mixture used comprises the following raw materials in parts by weight: 93.5 parts of mineral aggregate, 3 parts of filler and 3.5 parts of matrix asphalt.

The mineral aggregate can be selected from limestone, basalt, granite or diabase, etc., and the performance index of the mineral aggregate should meet the requirements of technical Specification for construction of road asphalt pavement (JTGF 40-2004).

The filler is limestone mineral powder, and the quality index of the limestone mineral powder meets the requirements of technical Specifications for road asphalt pavement construction (JTGF 40-2004).

The adopted coal ash is I-grade coal ash, the fineness is not more than 18 percent, and the density is 2.6g/cm³(ii) a The modulus of the water glass is 3.4, and the solid content is 34%; the sodium hydroxide is white flaky particles with the density of 2.3g/cm³(ii) a The anti-settling aluminate ASA has a melting point of 75 ℃ and is white.

Example 1

A semi-flexible asphalt pavement material filled with fly ash-based geopolymer is prepared by the following steps:

1) preparing macroporous asphalt mixed soil:

weighing 93.5 parts by weight of limestone mineral aggregate and heating to 150 ℃; 3 parts by weight of limestone mineral powder, and heating to 150 ℃, wherein the mixture of the limestone mineral powder and the limestone mineral powder (filler) is graded as follows: the sieve aperture passing rate of 26.5mm is 100%, the sieve aperture passing rate of 19mm is 95%, the sieve aperture passing rate of 16mm is 80%, the sieve aperture passing rate of 13.2mm is 52%, the sieve aperture passing rate of 9.5mm is 26.5%, the sieve aperture passing rate of 4.75mm is 15.5%, and the sieve aperture passing rate of 0.075mm is 2%; weighing 3.5 weight parts of AH-70 matrix asphalt, and heating to 142 ℃; pouring limestone ore materials into a stirring pot heated to 150 ℃, stirring for 60s, pouring matrix asphalt into the stirring pot, stirring for 60s, pouring the ore powder into the stirring pot, stirring for 60s, and finally performing positive and negative compaction on the asphalt mixture obtained after stirring by using an electric Marshall compaction instrument for 50 times to obtain the large-pore asphalt concrete, wherein the communication porosity of the large-pore asphalt concrete is 23.2%, and the Marshall stability is 4.0 kN;

2) preparing a fly ash-based polymer grouting material:

respectively pouring the three materials into a beaker according to the sequence of 20 parts by weight of water glass, 10 parts by weight of water and 5 parts by weight of sodium hydroxide, immediately stirring by using a glass rod, then placing the prepared solution in a thermostatic water bath at 25 ℃, and placing for 1-2 days for later use; firstly, 60 parts by weight of fly ash is poured into a container, a stirrer is started, after the mixture is slowly stirred for 30s, the prepared solution and 3 parts by weight of anti-settling aluminate ASA are poured, the mixture is continuously stirred for 10-15min, and after the stirring is finished, the coal ash based polymer grouting material is obtained, wherein the 7d compressive strength of the coal ash based polymer grouting material can reach 22MPa, and the flexural strength of the coal ash based polymer grouting material can reach 2.5 MPa;

3) the prepared coal ash-based polymer grouting material is immediately poured into matrix macroporous asphalt mixed soil, and the concrete steps comprise: debugging a cement forming vibration table, and placing parent macroporous asphalt mixed soil on the cement vibration table; pouring the coal ash-based polymer grouting material on the parent macroporous asphalt mixed soil, wherein the volume ratio of the coal ash-based polymer grouting material to the parent macroporous asphalt mixed soil is 1:3, and pouring while vibrating; and (3) stopping the slurry from seeping, closing the vibrating table, scraping the slurry on the surface by a scraper, standing for 24 hours, and curing for 7 days in a curing oven with the temperature of 30 ℃ and the humidity of more than or equal to 90% to obtain the semi-flexible asphalt pavement material filled with the fly ash-based polymer. The semi-flexible asphalt pavement material filled with the fly ash-based polymer obtained in the embodiment is subjected to tests of high-temperature performance, low-temperature performance, water stability performance, bonding performance and the like, and the results are as follows:

(1) high temperature performance

And (3) testing the high-temperature anti-rutting performance, namely manufacturing the obtained semi-flexible asphalt pavement material into a rutting plate with the size of 300mm multiplied by 50mm, and performing a rutting test at the temperature of 60 ℃, wherein the test result shows that the high-temperature dynamic stability of the obtained semi-flexible asphalt pavement material is 36000 times/mm and is far greater than the rutting dynamic stability data of the asphalt material.

(2) Low temperature performance

Low temperature crack resistance test: preparing a matrix asphalt mixture into a cylindrical test piece with the size of 150mm in diameter and 50mm in height, filling the cylindrical test piece into fly ash based polymer slurry for curing and forming, and then testing the cylindrical test pieceThe semi-flexible asphalt pavement material is semi-cut along the radius to form a semi-circular test piece, a slit with the thickness of 5mm is formed in the middle of the semi-circular test piece, an SCB test is carried out at the temperature of minus 10 ℃, and the test result shows that the fracture energy of the semi-flexible asphalt pavement material obtained in the embodiment is 900.6J/m²。

(3) Freezing and thawing cleavage test

The freeze-thaw splitting test is adopted to test the water stability of the semi-flexible asphalt pavement material obtained in the embodiment, and the result shows that the freeze-thaw splitting ratio of the semi-flexible asphalt mixture filled with the fly ash-based polymer is 77.5% and is more than 75% of the standard requirement.

(4) Immersion marshall test

The water stability of the semi-flexible asphalt pavement material obtained in the embodiment is tested by a water immersion marshall test, and the result shows that the water immersion residual stability of the semi-flexible asphalt mixture filled with the fly ash-based polymer is 90.6%, which far exceeds 80% of the standard requirement.

(5) Bonding performance

The contact angle test is adopted to test the binding performance between the mixed material matrix and the fly ash grouting material in the embodiment, and the result shows that the interface between the mixed material matrix and the fly ash grouting material reaches 53.32mJ/m²The bonding performance is good.

Example 2

A semi-flexible asphalt pavement material filled with fly ash-based geopolymer is prepared by the following steps:

1) preparing macroporous asphalt mixed soil:

weighing 93.5 parts by weight of limestone mineral aggregate and heating to 150 ℃; 3 parts by weight of limestone mineral powder, and heating to 150 ℃, wherein the mixture of the limestone mineral powder and the limestone mineral powder (filler) is graded as follows: the sieve aperture passing rate of 26.5mm is 100%, the sieve aperture passing rate of 19mm is 95%, the sieve aperture passing rate of 16mm is 80%, the sieve aperture passing rate of 13.2mm is 52%, the sieve aperture passing rate of 9.5mm is 26.5%, the sieve aperture passing rate of 4.75mm is 15.5%, and the sieve aperture passing rate of 0.075mm is 2%; weighing 3.5 weight parts of AH-70 matrix asphalt, and heating to 142 ℃; pouring limestone ore materials into a stirring pot heated to 150 ℃, stirring for 60s, pouring matrix asphalt into the stirring pot, stirring for 60s, pouring the ore powder into the stirring pot, stirring for 60s, and finally performing positive and negative compaction on the asphalt mixture obtained after stirring by using an electric Marshall compaction instrument for 50 times to obtain the large-pore asphalt concrete, wherein the communication porosity of the large-pore asphalt concrete is 23.2%, and the Marshall stability is 4.0 kN;

2) preparing a fly ash-based polymer grouting material:

respectively pouring the three materials into a beaker according to the sequence of 20 parts by weight of water glass, 10 parts by weight of water and 5 parts by weight of sodium hydroxide, immediately stirring by using a glass rod, then placing the prepared solution in a thermostatic water bath at 25 ℃, and placing for 1-2 days for later use; firstly, 60 parts by weight of fly ash is poured into a container, a stirrer is started, after the mixture is slowly stirred for 30s, the prepared solution and 5 parts by weight of anti-settling aluminate ASA are poured, the mixture is continuously stirred for 10-15min, and after the stirring is finished, the coal ash based polymer grouting material is obtained, wherein the 7d compressive strength can reach 25MPa, and the flexural strength can reach 3.5 MPa;

3) the prepared coal ash-based polymer grouting material is immediately poured into matrix macroporous asphalt mixed soil, and the concrete steps comprise: debugging a cement forming vibration table, and placing parent macroporous asphalt mixed soil on the cement vibration table; pouring the coal ash-based polymer grouting material on the parent macroporous asphalt mixed soil, wherein the volume ratio of the coal ash-based polymer grouting material to the parent macroporous asphalt mixed soil is 1:3, and pouring while vibrating; and (3) stopping the slurry from seeping, closing the vibrating table, scraping the slurry on the surface by a scraper, standing for 24 hours, and curing for 7 days in a curing oven with the temperature of 30 ℃ and the humidity of more than or equal to 90% to obtain the semi-flexible asphalt pavement material filled with the fly ash-based polymer. The semi-flexible asphalt pavement material filled with the fly ash-based polymer obtained in the embodiment is subjected to tests of high-temperature performance, low-temperature performance, water stability performance, bonding performance and the like, and the results are as follows:

(1) high temperature performance

And (3) testing the high-temperature anti-rutting performance, namely manufacturing the obtained semi-flexible asphalt pavement material into a rutting plate with the size of 300mm multiplied by 50mm, and performing a rutting test at the temperature of 60 ℃, wherein the test result shows that the high-temperature dynamic stability of the obtained semi-flexible asphalt pavement material is 45000 times/mm and is far greater than the rutting dynamic stability data of the asphalt material.

(2) Low temperature performance

Low temperature crack resistance test: the method comprises the steps of manufacturing a base asphalt mixture into a cylindrical test piece with the size of 150mm in diameter and 50mm in height, pouring fly ash-based polymer slurry for curing and forming, half-cutting the cylindrical test piece along the radius to form a semicircular test piece, cutting a slit with the thickness of 5mm in the middle of the semicircular test piece, and performing an SCB test at the temperature of-10 ℃, wherein test results show that the fracture energy of the semi-flexible asphalt pavement material obtained in the embodiment is 1000.6J/m²。

(3) Freezing and thawing cleavage test

The freeze-thaw splitting test is adopted to test the water stability of the semi-flexible asphalt pavement material obtained in the embodiment, and the result shows that the freeze-thaw splitting ratio of the semi-flexible asphalt mixture filled with the fly ash-based polymer is 79.5%, which is more than 75% of the standard requirement.

(4) Immersion marshall test

The water stability of the semi-flexible asphalt pavement material obtained in the embodiment is tested by a water immersion marshall test, and the result shows that the water immersion residual stability of the semi-flexible asphalt mixture filled with the fly ash-based polymer is 95.8 percent and far exceeds 80 percent of the standard requirement.

(5) Bonding performance

The contact angle test is adopted to test the binding performance between the mixed material matrix and the fly ash grouting material in the embodiment, and the result shows that the interface between the mixed material matrix and the fly ash grouting material reaches 60.32mJ/m²The bonding performance is good.

Example 3

A semi-flexible asphalt pavement material filled with fly ash-based geopolymer is prepared by the following steps:

1) preparing macroporous asphalt mixed soil:

weighing 93.5 parts by weight of limestone mineral aggregate and heating to 150 ℃; 3 parts by weight of limestone mineral powder, and heating to 150 ℃; wherein the mixture of the mineral aggregate and the filler is graded as follows: the passing rate of a 26.5mm sieve pore is 100%, the passing rate of a 19mm sieve pore is 95%, the passing rate of a 16mm sieve pore is 80%, the passing rate of a 13.2mm sieve pore is 52%, the passing rate of a 9.5mm sieve pore is 26.5%, the passing rate of a 4.75mm sieve pore is 15.5%, and the passing rate of a 0.075mm sieve pore is 2%, and the corresponding weight of the mineral aggregate is weighed and heated to 150 ℃; weighing 3.5 weight parts of AH-70 matrix asphalt, and heating to 142 ℃; pouring limestone ore materials into a stirring pot heated to 150 ℃, stirring for 60s, pouring matrix asphalt into the stirring pot, stirring for 60s, pouring the ore powder into the stirring pot, stirring for 60s, and finally performing positive and negative compaction on the asphalt mixture obtained after stirring by using an electric Marshall compaction instrument for 50 times to obtain the large-pore asphalt concrete, wherein the communication porosity of the large-pore asphalt concrete is 23.2%, and the Marshall stability is 4.0 kN;

2) preparing a fly ash-based polymer grouting material:

respectively pouring the three materials into a beaker according to the sequence of 20 parts by weight of water glass, 10 parts by weight of water and 5 parts by weight of sodium hydroxide, immediately stirring by using a glass rod, then placing the prepared solution in a thermostatic water bath at 25 ℃, and placing for 1-2 days for later use; firstly, 70 parts by weight of fly ash is poured into a container, a stirrer is started, after the slow stirring is carried out for 30s, the prepared solution and 5 parts by weight of anti-settling aluminate ASA are poured, the stirring is continued for 10-15min, and after the stirring is finished, the fly ash-based polymer grouting material is obtained, wherein the 7d compressive strength can reach 30MPa, and the flexural strength can reach 4.0 MPa;

3) the prepared coal ash-based polymer grouting material is immediately poured into matrix macroporous asphalt mixed soil, and the concrete steps comprise: debugging a cement forming vibration table, and placing parent macroporous asphalt mixed soil on the cement vibration table; pouring the coal ash-based polymer grouting material on the parent macroporous asphalt mixed soil, wherein the volume ratio of the coal ash-based polymer grouting material to the parent macroporous asphalt mixed soil is 1:3, and pouring while vibrating; and (3) stopping the slurry from seeping, closing the vibrating table, scraping the slurry on the surface by a scraper, standing for 24 hours, and curing for 7 days in a curing oven with the temperature of 30 ℃ and the humidity of more than or equal to 90% to obtain the semi-flexible asphalt pavement material filled with the fly ash-based polymer.

The semi-flexible asphalt pavement material filled with the fly ash-based polymer obtained in the embodiment is subjected to tests of high-temperature performance, low-temperature performance, water stability performance, bonding performance and the like, and the results are as follows:

(1) high temperature stability

And (2) testing the high-temperature anti-rutting performance, namely manufacturing the obtained semi-flexible asphalt pavement material into a rutting plate with the size of 300mm multiplied by 50mm, and performing a rutting test at the temperature of 60 ℃, wherein the test result shows that the high-temperature dynamic stability of the obtained semi-flexible asphalt pavement material is 53000 times/mm and is far greater than the rutting dynamic stability data of the asphalt material.

(2) Low temperature crack resistance

Low temperature crack resistance test: the method comprises the steps of manufacturing a base asphalt mixture into a cylindrical test piece with the size of 150mm in diameter and 50mm in height, pouring fly ash-based polymer slurry for curing and forming, half-cutting the cylindrical test piece along the radius to form a semicircular test piece, cutting a slit with the thickness of 5mm in the middle of the semicircular test piece, and performing an SCB test at the temperature of-10 ℃, wherein test results show that the fracture energy of the semi-flexible asphalt pavement material obtained in the embodiment is 846.6J/m²。

(3) Freezing and thawing cleavage test

The freeze-thaw splitting test is adopted to test the water stability of the semi-flexible asphalt pavement material obtained in the embodiment, and the result shows that the freeze-thaw splitting ratio of the semi-flexible asphalt mixture filled with the fly ash-based polymer is 82.4% and is greater than 75% of the standard requirement.

(4) Immersion marshall test

The water stability of the semi-flexible asphalt pavement material obtained in the embodiment is tested by a water immersion marshall test, and the result shows that the water immersion residual stability of the semi-flexible asphalt pavement material filled with the fly ash-based polymer is 98.3%, which far exceeds 80% of the standard requirement.

(5) Bonding performance

The contact angle test is adopted to test the binding performance between the mixed material matrix and the fly ash grouting material in the embodiment, and the result shows that the interface between the mixed material matrix and the fly ash grouting material reaches 55.99mJ/m²The bonding performance is good.

Example 4

A semi-flexible asphalt pavement material filled with fly ash-based geopolymer is prepared by the following steps:

1) preparing macroporous asphalt mixed soil:

weighing 93.5 parts by weight of limestone mineral aggregate and heating to 150 ℃; 3 parts by weight of limestone mineral powder, and heating to 150 ℃, wherein the mixture of the limestone mineral powder and the limestone mineral powder (filler) is graded as follows: the sieve aperture passing rate of 26.5mm is 100%, the sieve aperture passing rate of 19mm is 95%, the sieve aperture passing rate of 16mm is 80%, the sieve aperture passing rate of 13.2mm is 52%, the sieve aperture passing rate of 9.5mm is 26.5%, the sieve aperture passing rate of 4.75mm is 15.5%, and the sieve aperture passing rate of 0.075mm is 2%; weighing 3.5 weight parts of AH-70 matrix asphalt, and heating to 142 ℃; pouring limestone ore materials into a stirring pot heated to 150 ℃, stirring for 60s, pouring matrix asphalt into the stirring pot, stirring for 60s, pouring the ore powder into the stirring pot, stirring for 60s, and finally compacting the asphalt mixture obtained after stirring positively and negatively for 50 times by using an electric Marshall compaction instrument to obtain the macroporous asphalt mixed soil; the interconnected porosity was 23.2%, and marshall stability was 4.0 kN;

2) preparing a fly ash-based polymer grouting material:

respectively pouring the three materials into a beaker according to the sequence of 20 parts by weight of water glass, 10 parts by weight of water and 5 parts by weight of sodium hydroxide, immediately stirring by using a glass rod, then placing the prepared solution in a thermostatic water bath at 25 ℃, and placing for 1-2 days for later use; firstly, 80 parts by weight of fly ash is poured into a container, a stirrer is started, after stirring is carried out for 30s slowly, the prepared solution and 5 parts by weight of anti-settling aluminate ASA are poured, stirring is continued for 10-15min, and after the stirring is finished, the fly ash-based polymer grouting material is obtained, wherein the 7d compressive strength can reach 35MPa, and the flexural strength can reach 4.5 MPa.

3) The prepared coal ash-based polymer grouting material is immediately poured into matrix macroporous asphalt mixed soil, and the concrete steps comprise: debugging a cement forming vibration table, and placing parent macroporous asphalt mixed soil on the cement vibration table; pouring the coal ash-based polymer grouting material on the parent macroporous asphalt mixed soil, wherein the volume ratio of the coal ash-based polymer grouting material to the parent macroporous asphalt mixed soil is 1:3, and pouring while vibrating; and (3) stopping the slurry from seeping, closing the vibrating table, scraping the slurry on the surface by a scraper, standing for 24 hours, and curing for 7 days in a curing oven with the temperature of 30 ℃ and the humidity of more than or equal to 90% to obtain the semi-flexible asphalt pavement material filled with the fly ash-based polymer.

The semi-flexible asphalt pavement material filled with the fly ash-based polymer obtained in the embodiment is subjected to tests of high-temperature performance, low-temperature performance, water stability performance, bonding performance and the like, and the results are as follows:

(1) high temperature stability

And (3) testing the high-temperature anti-rutting performance, namely manufacturing the obtained semi-flexible asphalt pavement material into a rutting plate with the size of 300mm multiplied by 50mm, and performing a rutting test at the temperature of 60 ℃, wherein the test result shows that the high-temperature dynamic stability of the obtained semi-flexible asphalt pavement material is 63000 times/mm and is far greater than the rutting dynamic stability data of the asphalt material.

(2) Low temperature crack resistance

Low temperature crack resistance test: the method comprises the steps of manufacturing a base asphalt mixture into a cylindrical test piece with the size of 150mm in diameter and 50mm in height, pouring fly ash-based polymer slurry for curing and forming, half-cutting the cylindrical test piece along the radius to form a semicircular test piece, cutting a slit with the thickness of 5mm in the middle of the semicircular test piece, and performing an SCB test at the temperature of-10 ℃, wherein test results show that the fracture energy of the semi-flexible asphalt pavement material obtained in the embodiment is 668.1J/m²。

(3) Freezing and thawing cleavage test

The freeze-thaw splitting test is adopted to test the water stability of the semi-flexible asphalt pavement material obtained in the embodiment, and the result shows that the freeze-thaw splitting ratio of the semi-flexible asphalt pavement material filled with the fly ash-based polymer is 85.0% and is greater than 75% of the standard requirement.

(4) Immersion marshall test

The water stability of the semi-flexible asphalt pavement material obtained in the embodiment is tested by a water immersion marshall test, and the result shows that the water immersion residual stability of the semi-flexible asphalt pavement material filled with the fly ash-based polymer is 105%, which is far beyond 80% of the standard requirement.

(5) Bonding performance

The contact angle test is adopted to test the binding performance between the mixed material matrix and the fly ash grouting material in the embodiment, and the result shows that the interface between the mixed material matrix and the fly ash grouting material reaches 50.94mJ/m²The bonding performance is good.

Comparative example 1

A semi-flexible asphalt pavement material filled with fly ash-based geopolymer is prepared by the following steps:

1) preparing macroporous asphalt mixed soil:

weighing 93.5 parts by weight of limestone mineral aggregate and heating to 150 ℃; 3 parts by weight of limestone mineral powder, and heating to 150 ℃, wherein the mixture of the limestone mineral powder and the limestone mineral powder (filler) is graded as follows: the sieve aperture passing rate of 26.5mm is 100%, the sieve aperture passing rate of 19mm is 95%, the sieve aperture passing rate of 16mm is 80%, the sieve aperture passing rate of 13.2mm is 52%, the sieve aperture passing rate of 9.5mm is 26.5%, the sieve aperture passing rate of 4.75mm is 15.5%, and the sieve aperture passing rate of 0.075mm is 2%; weighing 3.5 weight parts of AH-70 matrix asphalt, and heating to 142 ℃; pouring limestone ore materials into a stirring pot heated to 150 ℃, stirring for 60s, pouring matrix asphalt into the stirring pot, stirring for 60s, pouring the ore powder into the stirring pot, stirring for 60s, and finally performing positive and negative compaction on the asphalt mixture obtained after stirring by using an electric Marshall compaction instrument for 50 times to obtain the large-pore asphalt concrete, wherein the communication porosity of the large-pore asphalt concrete is 23.2%, and the Marshall stability is 4.0 kN;

2) preparing a fly ash-based polymer grouting material:

respectively pouring the three materials into a beaker according to the sequence of 20 parts by weight of water glass, 10 parts by weight of water and 5 parts by weight of sodium hydroxide, immediately stirring by using a glass rod, then placing the prepared solution in a thermostatic water bath at 25 ℃, and placing for 1-2 days for later use; firstly, 60 parts by weight of fly ash is poured into a container, a stirrer is started, stirring is carried out for 10-15min, and after the stirring is finished, the fly ash-based polymer grouting material is obtained, wherein the 7d compressive strength of the grouting material can reach 20MPa, and the flexural strength of the grouting material can reach 2.0 MPa;

the prepared coal ash-based polymer grouting material is immediately poured into matrix macroporous asphalt mixed soil, and the concrete steps comprise: debugging a cement forming vibration table, and placing parent macroporous asphalt mixed soil on the cement vibration table; pouring the coal ash-based polymer grouting material on the parent macroporous asphalt mixed soil, wherein the volume ratio of the coal ash-based polymer grouting material to the parent macroporous asphalt mixed soil is 1:3, and pouring while vibrating; and (3) stopping the slurry from seeping, closing the vibrating table, scraping the slurry on the surface by a scraper, standing for 24 hours, and curing for 7 days in a curing oven with the temperature of 30 ℃ and the humidity of more than or equal to 90% to obtain the semi-flexible asphalt pavement material filled with the fly ash-based polymer.

The semi-flexible asphalt pavement material obtained in the comparative example was subjected to a performance test by the method described in reference example 1, and the freeze-thaw split ratio was 67.5%, and the fracture energy was 504.1J/m²High-temperature dynamic stability of 12000 times/mm and interface energy of 35.86mJ/m². Aiming at the sand-free fly ash based oligomer grouting material system in the comparative example, the water stability, high temperature performance, low temperature performance and bonding performance of the obtained semi-flexible asphalt pavement material are obviously reduced compared with those of the semi-flexible asphalt pavement material in the embodiments 1 to 3, and the water stability does not meet the specification requirement and cannot meet the construction requirement.

Comparative example 2

A semi-flexible asphalt pavement material filled with fly ash-based geopolymer is prepared by the following steps:

1) preparing macroporous asphalt mixed soil:

weighing 93.5 parts by weight of limestone mineral aggregate and heating to 150 ℃; 3 parts by weight of limestone mineral powder, and heating to 150 ℃, wherein the mixture of the limestone mineral powder and the limestone mineral powder (filler) is graded as follows: the sieve aperture passing rate of 26.5mm is 100%, the sieve aperture passing rate of 19mm is 95%, the sieve aperture passing rate of 16mm is 80%, the sieve aperture passing rate of 13.2mm is 52%, the sieve aperture passing rate of 9.5mm is 26.5%, the sieve aperture passing rate of 4.75mm is 15.5%, and the sieve aperture passing rate of 0.075mm is 2%; weighing 3.5 weight parts of AH-70 matrix asphalt, and heating to 142 ℃; pouring limestone ore materials into a stirring pot heated to 150 ℃, stirring for 60s, pouring matrix asphalt into the stirring pot, stirring for 60s, pouring the ore powder into the stirring pot, stirring for 60s, and finally performing positive and negative compaction on the asphalt mixture obtained after stirring by using an electric Marshall compaction instrument for 50 times to obtain the large-pore asphalt concrete, wherein the communication porosity of the large-pore asphalt concrete is 23.2%, and the Marshall stability is 4.0 kN;

2) preparing a fly ash-based polymer grouting material:

respectively pouring the three materials into a beaker according to the sequence of 20 parts by weight of water glass, 10 parts by weight of water and 5 parts by weight of sodium hydroxide, immediately stirring by using a glass rod, then placing the prepared solution in a thermostatic water bath at 25 ℃, and placing for 1-2 days for later use; firstly, 60 parts by weight of fly ash is poured into a container, a stirrer is started, the mixture is slowly stirred for 30s, then the prepared solution and 5 parts by weight of KH-550 silane coupling agent are poured, the mixture is continuously stirred for 10-15min, and after the stirring is finished, the fly ash-based polymer grouting material is obtained, wherein the 7d compressive strength can reach 22MPa, and the flexural strength can reach 2.5 MPa;

the prepared coal ash-based polymer grouting material is immediately poured into matrix macroporous asphalt mixed soil, and the concrete steps comprise: debugging a cement forming vibration table, and placing parent macroporous asphalt mixed soil on the cement vibration table; pouring the coal ash-based polymer grouting material on the parent macroporous asphalt mixed soil, wherein the volume ratio of the coal ash-based polymer grouting material to the parent macroporous asphalt mixed soil is 1:3, and pouring while vibrating; and (3) stopping the slurry from seeping, closing the vibrating table, scraping the slurry on the surface by a scraper, standing for 24 hours, and curing for 7 days in a curing oven with the temperature of 30 ℃ and the humidity of more than or equal to 90% to obtain the semi-flexible asphalt pavement material filled with the fly ash-based polymer.

The semi-flexible asphalt pavement material obtained in the comparative example was subjected to a performance test by the method described in reference example 1, and had a freeze-thaw split ratio of 75.5% and a fracture energy of 554.71J/m²The high-temperature dynamic stability is 16000 times/mm, and the interface energy is 40.54mJ/m². Wherein the water stability, high temperature performance, low temperature performance and combination performance are obviously reduced compared with those of the embodiments 1-3.

The results show that the filler-fly ash based polymer slurry of the semi-flexible asphalt mixture obtained by the invention has uniform and stable slurry body, the strength and the bonding performance are high after the filler-fly ash based polymer slurry is poured into the matrix mixture, and the obtained semi-flexible asphalt pavement material can simultaneously give consideration to excellent high-temperature stability, low-temperature crack resistance, water stability and the like.

The above examples of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations will be apparent to persons skilled in the art upon consideration of the foregoing description. All embodiments need not be exhaustive, and the upper and lower limits and intervals of the raw materials can be used to practice the present invention.