阅读说明：本技术 一种化学反应型冷补沥青混合料的制备方法 (Preparation method of chemical reaction type cold-patch asphalt mixture ) 是由 沈凡 刘非易 韦国苏 余泳幸 满吉田 姜亦夏 张子艺 姜庭威 李国梁 陈楚琪 沈 于 2021-01-21 设计创作，主要内容包括：本发明提供一种化学反应型冷补沥青混合料的制备方法,该制备方法通过向沥青中掺入适量的特殊稀释剂,降低沥青的黏度,使得该种冷补沥青混合料可以在常温下施工,并通过在沥青混合料中掺入化学反应剂,在对路面进行修补后,该种化学反应剂可以与特殊稀释剂进行反应,不仅提高了沥青混合料之间的粘结作用,还使得冷补沥青混合料具有较好的施工和易性,而且通过煅烧CaCO-3、SiO-2与Fe-2O-3制备得到的煅烧物在冷补沥青混合料施工后可以缓慢进行水化,生成Ca(OH)-2,促使化学反应剂与油酸可以持续进行反应,生成脂肪酸盐,生成物不仅可以填充混合料的间隙,使沥青混合料结构更加密实,还可以提高混合料的水稳定性能与后期强度。(The invention provides a preparation method of a chemical reaction type cold patch asphalt mixture, which reduces the viscosity of asphalt by doping a proper amount of special diluent into the asphalt, so that the cold patch asphalt mixture can be constructed at normal temperature, and the chemical reactant is doped into the asphalt mixture, so that the chemical reactant can react with the special diluent after repairing a pavement, thereby not only improving the bonding effect between the asphalt mixtures, but also leading the cold patch asphalt mixture to have better construction workability, and calcining CaCO 3 、SiO 2 With Fe 2 O 3 The prepared calcined substance can be slowly hydrated after the construction of the cold patch asphalt mixture to generate Ca (OH) 2 The chemical reactant and the oleic acid can be promoted to continuously react to generate the fatty acid salt, and the product can not only fill the gap of the mixture to ensure that the asphalt mixture has a more compact structure, but also can be used for improving the quality of the asphalt mixtureHigh water stability and later strength of the mixture.)

1. The preparation method of the chemical reaction type cold-patch asphalt mixture is characterized by comprising the following steps of:

1) preparing a cold patch reactant:

mixing CaCO₃、SiO₂With Fe₂O₃Fully and uniformly mixing the raw materials according to the molar ratio of 2.5: 1: 0.006-3.5: 1: 0.006, then carrying out heat preservation calcination at 800-900 ℃ for 20min, then continuously heating to 1400-1500 ℃, carrying out heat preservation calcination for 30min, and carrying out quenching to obtain a calcined substance A;

mixing the calcined substance A and a chemical reactant according to the mass ratio of 1: 1-1: 0.5, and then carrying out ball milling to obtain a cold patch reactant;

2) preparing a reactive cold patch asphalt liquid:

heating and softening the matrix asphalt, adding a diluent, uniformly stirring at 90-100 ℃, and cooling to prepare a reactive cold patch asphalt solution; the diluent is obtained by uniformly mixing oleic acid, palmitic acid and lauric acid according to the mass ratio of 1: 1-3: 1;

3) preparing a chemical reaction type cold patch asphalt mixture:

preheating mineral aggregates with different particle sizes to 100-120 ℃, heating and softening the reactive cold patch asphalt liquid, and then preserving heat at 90-100 ℃;

uniformly stirring the heat-insulated mineral aggregates with different particle sizes at 90-100 ℃ according to a set gradation to obtain a mineral aggregate mixture;

and mixing the mineral aggregate mixture and the heat-insulating reactive cold patch asphalt liquid at 90-100 ℃, mixing uniformly, adding a cold patch reactant accounting for 0.5-1% of the mass of the mineral aggregate mixture, stirring uniformly, and cooling to room temperature to obtain the chemical reactive cold patch asphalt mixture.

2. The method for preparing a chemical reaction type cold patch asphalt mixture according to claim 1, wherein the chemical reactant in the step 1) is NaOH or Ca (OH)₂、CaO、NaCO₃One kind of (1).

3. The preparation method of the chemical reaction type cold-patch asphalt mixture according to claim 1, wherein the mass of the diluent in the step 2) is 20-25% of the mass of the reaction type cold-patch asphalt liquid.

4. The method for preparing the chemical reaction type cold patch asphalt mixture according to claim 1, wherein the base asphalt in the step 2) is one of grade A road petroleum asphalt 70#, grade A road petroleum asphalt 80# and grade A road petroleum asphalt 90 #.

5. The preparation method of the chemical reaction type cold-patch asphalt mixture according to claim 1, wherein the softening temperature of the matrix asphalt in the step 2) is 160-170 ℃.

6. The preparation method of the chemical reaction type cold patch asphalt mixture as claimed in claim 1, wherein the acid value of the palmitic acid in the step 2) is 220mg/g, the iodine value is less than or equal to 0.5%, and the content of the palmitic acid is greater than or equal to 99%; the oleic acid value is 190-203mg/g, the saponification value is 90-205mg/g, the iodine value is 80-100g/100g, the freezing point is less than 4.0 ℃, and the water content is less than 0.5 percent; the acid value of the lauric acid is 278-282mg/g, the saponification value is 279-283mg/g, and the iodine value is less than 0.5 percent.

7. The preparation method of the chemical reaction type cold patch asphalt mixture according to claim 1, wherein the softening temperature of the reaction type cold patch asphalt liquid in the step 3) is 130-140 ℃.

8. The preparation method of the chemical reaction type cold patch asphalt mixture according to claim 1, wherein the mineral aggregate in the step 3) is one or more of limestone, basalt, diabase and granite.

Technical Field

The invention relates to the technical field of road engineering, in particular to a preparation method of a chemical reaction type cold patch asphalt mixture.

Background

With the rapid development of the traffic industry in China, the asphalt pavement is widely applied to the construction of various highways such as expressways, urban roads and the like. In the long-term use process, various pavement diseases such as ruts, pits, cracks and the like gradually appear on the asphalt pavement under the action of natural conditions and vehicle loads. The pavement pit not only can affect the service performance and the driving comfort of the pavement, but also can harm the driving safety, so that the timely repair of the pavement pit is very important.

The cold-patch asphalt mixture is used as a high-efficiency and convenient road patching material, and can be suitable for road sections with small engineering quantity and dispersed pit slots. In addition, the cold-patch material is not limited by natural conditions and construction temperature, normal construction can be still performed when the temperature is lower in rainy season and winter, and traffic can be opened quickly after construction. The cold-patch asphalt mixture is convenient to store, repair at normal temperature and repair, and the characteristic that the traffic is opened immediately after construction makes up the limitation of a hot-patch method in repairing a road pit and a slot, so that the cold-patch asphalt mixture is more and more favored by road companies, particularly municipal construction departments. The cold patch asphalt mixture product mainly sold on the market at present is a solvent type cold patch asphalt material, and the asphalt is diluted into a liquid state by using organic solvents such as diesel oil or kerosene and the like, so that the prepared cold patch asphalt mixture has good construction performance at normal temperature, after the cold patch asphalt mixture is used for filling and compacting a pavement pit slot, the diesel oil in the mixture naturally volatilizes under the action of driving, the cohesive force between mineral aggregate becomes stronger, the internal structure of the mixture is gradually compact and compact, and the strength of the asphalt pavement is increased. However, the cold-patch asphalt mixture has obvious problems that the initial strength of the pavement is insufficient, the porosity is large, the water stability is poor, and diesel oil in the concrete is slow in volatilization and insufficient in volatilization, and the like.

Disclosure of Invention

In view of the above, the present invention aims to provide a method for preparing a chemical reaction type cold patch asphalt mixture, which is characterized in that a proper amount of a diluent is added into asphalt to reduce the viscosity of the asphalt, so that the cold patch asphalt mixture can be constructed at normal temperature; through doping the chemical reactant in the bituminous mixture, after repairing the road surface, this kind of chemical reactant can react with the diluent, can improve the adhesive effect between the bituminous mixture greatly, still can make cold patch bituminous mixture have better construction workability, has solved effectively that current cold patch bituminous mixture road surface initial strength is not enough, and the porosity is bigger than normal and leads to the water stability relatively poor, and the inside diesel oil of concrete volatilizes more slowly and volatilizees abundant problem inadequately.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a preparation method of a chemical reaction type cold patch asphalt mixture comprises the following steps:

1) preparing a cold patch reactant:

mixing CaCO₃、SiO₂With Fe₂O₃Fully and uniformly mixing the raw materials according to the molar ratio of 2.5: 1: 0.006-3.5: 1: 0.006, then carrying out heat preservation calcination at 800-900 ℃ for 20min, then continuously heating to 1400-1500 ℃, carrying out heat preservation calcination for 30min, and quenching to obtain a calcined product A, wherein CaCO in the calcined raw materials₃、SiO₂、Fe₂O₃The mass fractions are all more than or equal to 95 percent;

mixing the calcined substance A and a chemical reactant according to the mass ratio of 1: 1-1: 0.5, and then carrying out ball milling to obtain a cold patch reactant;

2) preparing a reactive cold patch asphalt liquid:

heating and softening the matrix asphalt, adding a diluent, uniformly stirring at 90-100 ℃, and cooling to prepare a reactive cold patch asphalt solution; the diluent is obtained by uniformly mixing oleic acid, palmitic acid and lauric acid according to the mass ratio of 1: 1-3: 1;

3) preparing a chemical reaction type cold patch asphalt mixture:

preheating mineral aggregates with different particle sizes to 100-120 ℃, heating and softening the reactive cold patch asphalt liquid, and then preserving heat at 90-100 ℃;

uniformly stirring the heat-insulated mineral aggregates with different particle sizes at 90-100 ℃ according to a set gradation to obtain a mineral aggregate mixture;

mixing the mineral aggregate mixture and the heat-insulating reactive cold-patch asphalt liquid at 90-100 ℃, mixing uniformly, adding the cold-patch reactant accounting for 0.5-1% of the mass of the mineral aggregate mixture, stirring uniformly, and cooling to room temperature to obtain the chemical reactive cold-patch asphalt mixture, wherein the set gradation of the mineral aggregate is carried out by selecting any one gradation type in the table 1 when preparing the asphalt mixture.

TABLE 1

Optionally, the chemical reactant in step 1) is NaOH, Ca (OH)₂、CaO、NaCO₃Wherein, NaOH and Ca (OH)₂、CaO、NaCO₃Are all analytically pure, and the mass fraction of the total mass fraction is more than or equal to 99 percent.

Optionally, the mass of the diluent in the step 2) is 20-25% of the mass of the reactive cold patch asphalt liquid.

Optionally, the base asphalt in the step 2) is one of grade a 70#, grade a 80# and grade a 90 petroleum asphalt.

Optionally, the softening temperature of the base asphalt in the step 2) is 160-170 ℃.

Optionally, the acid value of the palmitic acid in the step 2) is 220mg/g, the iodine value is less than or equal to 0.5%, and the content of the palmitic acid is more than or equal to 99%; the oleic acid value is 190-203mg/g, the saponification value is 90-205mg/g, the iodine value is 80-100g/100g, the freezing point is less than 4.0 ℃, and the water content is less than 0.5 percent; the acid value of the lauric acid is 278-282mg/g, the saponification value is 279-283mg/g, and the iodine value is less than 0.5 percent.

Optionally, the softening temperature of the reactive cold patch asphalt liquid in the step 3) for heating and softening is 130-140 ℃.

Optionally, the mineral aggregate in step 3) is one or more of limestone, basalt, diabase and granite.

Compared with the prior art, the preparation method of the chemical reaction type cold-patch asphalt mixture has the following advantages:

1. after the chemical reaction type cold-patch asphalt mixture is constructed, a chemical reactant and oleic acid are reacted in a water environment according to a reaction formula of R-COOH + NaOH → R-COONa + H₂The O reacts to generate a fatty acid salt between the asphalt and the asphalt or between the asphalt and the mineral aggregate, the fatty acid salt can be quickly hardened, so that the bonding property between the asphalt mixtures is favorably improved, and the chemical curing reaction is quick, so that the cold-patch asphalt mixture after construction can obtain higher early strength in a short period, the problem of insufficient initial strength of the conventional cold patch is solved, the rapid traffic opening after pavement repair can be ensured, and meanwhile, CaCO is calcined to generate the fatty acid salt₃、SiO₂With Fe₂O₃The prepared calcined substance can be slowly hydrated after the construction of the cold patch asphalt mixture to generate Ca (OH)₂The chemical reactant and the oleic acid in the chemical reaction type cold-patch asphalt mixture can be promoted to continuously react to generate the fatty acid salt, and the product can not only fill the gap of the mixture, so that the asphalt mixture structure is more compact, and the water stability and the later strength of the mixture can be improved.

2. The invention takes industrial oleic acid as a main diluent, the solubility parameter Sigma (SI) of the oleic acid is 15.6, the solubility parameter Sigma (SI) of asphalt is about 16,the solubility parameters of the oleic acid and the asphalt are close to each other, so that the oleic acid can be well dispersed in an asphalt solution, the oleic acid and the asphalt are promoted to have good compatibility, the oleic acid is in a liquid state at normal temperature, and the density of the oleic acid is 0.89g/cm³In addition, the oleic acid is easy to store, has no pungent smell and is low in price, so that the preparation cost of the chemical reaction type cold patch asphalt mixture can be greatly reduced, and the popularization and the application of the chemical reaction type cold patch asphalt mixture in road engineering are promoted.

3. The chemical reaction type cold-patch asphalt mixture integrates the advantages of excellent road performance of the reaction type cold-patch asphalt mixture and convenience in repairing and easy to store of the solvent type cold-patch asphalt mixture, and promotes the development of the asphalt pavement cold-patch technology in the aspect of road maintenance.

4. The chemical reaction type cold-patch asphalt mixture has the advantages of simple preparation method, flexible process control, lower preparation cost and easy storage and construction, and can effectively inhibit the chemical reaction in the asphalt mixture only by sealing and storing, so that the asphalt mixture has good storage performance at normal temperature, thereby having important application and popularization values.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail with reference to examples.

Example 1

A preparation method of a chemical reaction type cold patch asphalt mixture specifically comprises the following steps:

1) preparation of cold-patch reactant

Mixing CaCO₃、SiO₂With Fe₂O₃Mixing at a molar ratio of 3: 1: 0.006, heating to 800 deg.C in a high temperature furnace, maintaining for 20min, heating to 1500 deg.C again, maintaining for 30min, quenching the calcined product,obtaining a calcined product A in which CaCO in the raw material is calcined₃、SiO₂、Fe₂O₃The mass fractions are all more than or equal to 95 percent,

mixing the calcined product A and NaOH according to the mass ratio of 1: 0.5, and then placing the mixture into a ball mill to be ground into powder to obtain a cold patch reactant, wherein the NaOH is analytically pure and has the mass fraction of more than or equal to 99%;

2) preparation of reaction type cold patch asphalt liquid

Heating and softening matrix asphalt at 170 ℃, adding a diluent into the softened matrix asphalt solution, uniformly stirring at 100 ℃, and cooling to prepare a reactive cold patch asphalt solution, wherein the matrix asphalt is 70# A-grade road petroleum asphalt, the mass of the added diluent accounts for 20% of the mass of the mixed solution (the reactive cold patch asphalt solution), the diluent is obtained by uniformly mixing oleic acid, palmitic acid and lauric acid according to the mass ratio of 3: 1, the palmitic acid, the oleic acid and the lauric acid are industrial acids, the acid value of the palmitic acid is 220mg/g, the iodine value is less than or equal to 0.5%, and the content of the palmitic acid is more than or equal to 99%; the oleic acid value is 190-203mg/g, the saponification value is 90-205mg/g, the iodine value is 80-100g/100g, the freezing point is less than 4.0 ℃, and the water content is less than 0.5 percent; the acid value of lauric acid is 278-282mg/g, the saponification value is 279-283mg/g, and the iodine value is less than 0.5 percent;

3) preparation of chemical reaction type cold-patch asphalt mixture

Heating mineral aggregates with different particle sizes to 120 ℃, heating and softening the reaction type cold patch asphalt liquid at the temperature of 140 ℃, and placing the reaction type cold patch asphalt liquid in a 100 ℃ oven for heat preservation;

mixing and stirring the mineral aggregates with different particle sizes in the oven for 60s at 100 ℃ according to set gradation, so that the coarse mineral aggregates and the fine mineral aggregates are uniformly mixed to obtain a mineral aggregate mixture, wherein the mineral aggregate is limestone, and the set gradation of the mineral aggregates is performed according to gradation 5 in the table 1 when the mineral aggregate mixture is prepared;

and mixing and stirring the reactive cold patch asphalt liquid in the oven and the mineral aggregate mixture for 90 seconds at the temperature of 100 ℃, uniformly mixing, then adding a cold patch reactant accounting for 1% of the mass of the mineral aggregate mixture, stirring for 60 seconds, uniformly mixing, cooling the mixture to room temperature to obtain a chemical reactive cold patch asphalt mixture, and hermetically storing the obtained chemical reactive cold patch asphalt mixture to inhibit chemical reactions in the asphalt mixture and ensure that the asphalt mixture has good storage performance at normal temperature.

The specific construction method of the chemical reaction type cold patch asphalt mixture comprises the following steps:

when repairing the pavement pit slot, the chemical reaction type cold-patch asphalt mixture of the embodiment is poured into the cleaned pit slot, and the traffic can be opened after half an hour of uniform watering and compacting according to the proportion of adding 500ml of water into each kilogram of cold patch materials.

The performance of the chemical reaction type cold patch asphalt mixture of the embodiment is tested with reference to JTT 972-.

The detection proves that the initial Marshall stability of the chemical reaction type cold-patch asphalt mixture can reach 5kN, the Marshall stability after 7 days can exceed 10kN, the water stability reaches 86.2 percent, and the penetration strength reaches 3.02 MPa.

Example 2

A preparation method of a chemical reaction type cold patch asphalt mixture specifically comprises the following steps:

1) preparation of cold-patch reactant

Mixing CaCO₃、SiO₂With Fe₂O₃Mixing completely at a molar ratio of 3: 1: 0.006, heating to 800 deg.C in a high temperature furnace, maintaining for 20min, heating to 1500 deg.C again, maintaining for 30min, and quenching to obtain calcined product A, wherein CaCO in the raw material is calcined₃、SiO₂、Fe₂O₃The mass fractions are all more than or equal to 95 percent,

calcining A with Ca (OH)₂Mixing according to the mass ratio of 1: 0.5, placing the mixture into a ball mill, and grinding the mixture into powder to obtain the cold-patch reaction agent, wherein Ca (OH)₂The mass fraction is more than or equal to 99 percent for analytical purification;

2) preparation of reaction type cold patch asphalt liquid

Heating and softening matrix asphalt at 170 ℃, adding a diluent into the softened matrix asphalt solution, uniformly stirring at 100 ℃, and cooling to prepare a reactive cold patch asphalt solution, wherein the matrix asphalt is 70# A-grade road petroleum asphalt, the mass of the added diluent accounts for 20% of the mass of the mixed solution (the reactive cold patch asphalt solution), the diluent is obtained by uniformly mixing oleic acid, palmitic acid and lauric acid according to the mass ratio of 3: 1, the palmitic acid, the oleic acid and the lauric acid are industrial acids, the acid value of the palmitic acid is 220mg/g, the iodine value is less than or equal to 0.5%, and the content of the palmitic acid is more than or equal to 99%; the oleic acid value is 190-203mg/g, the saponification value is 90-205mg/g, the iodine value is 80-100g/100g, the freezing point is less than 4.0 ℃, and the water content is less than 0.5 percent; the acid value of lauric acid is 278-282mg/g, the saponification value is 279-283mg/g, and the iodine value is less than 0.5 percent;

3) preparation of chemical reaction type cold-patch asphalt mixture

Heating mineral aggregates with different particle sizes to 120 ℃, heating and softening the reaction type cold patch asphalt liquid at the temperature of 140 ℃, and placing the reaction type cold patch asphalt liquid in a 100 ℃ oven for heat preservation;

mixing and stirring the mineral aggregates with different particle sizes in the oven for 60s at 100 ℃ according to set gradation so as to uniformly mix the coarse mineral aggregates and the fine mineral aggregates to obtain a mineral aggregate mixture, wherein the mineral aggregate is limestone, and the set gradation of the mineral aggregates is selected from gradation 5 in the table 1 when the mineral aggregate mixture is prepared;

and mixing and stirring the reactive cold patch asphalt liquid in the oven and the mineral aggregate mixture for 90 seconds at the temperature of 100 ℃, uniformly mixing, then adding a cold patch reactant accounting for 1% of the mass of the mineral aggregate mixture, stirring for 60 seconds, uniformly mixing, cooling the mixture to room temperature to obtain a chemical reactive cold patch asphalt mixture, and hermetically storing the obtained chemical reactive cold patch asphalt mixture to inhibit chemical reactions in the asphalt mixture and ensure that the asphalt mixture has good storage performance at normal temperature.

The specific construction method of the chemical reaction type cold patch asphalt mixture comprises the following steps:

when repairing the pavement pit slot, the chemical reaction type cold-patch asphalt mixture of the embodiment is poured into the cleaned pit slot, and the traffic can be opened after half an hour of uniform watering and compacting according to the proportion of adding 500ml of water into each kilogram of cold patch materials.

The performance of the chemical reaction type cold patch asphalt mixture of the embodiment is tested with reference to JTT 972-.

The detection proves that the initial Marshall stability of the chemical reaction type cold-patch asphalt mixture can reach 6.3kN, the Marshall stability after 7 days can exceed 10kN, the water stability reaches 85.8 percent, and the penetration strength reaches 3.52 MPa.

Example 3

A preparation method of a chemical reaction type cold patch asphalt mixture specifically comprises the following steps:

1) preparation of cold-patch reactant

Mixing CaCO₃、SiO₂With Fe₂O₃Mixing completely at a molar ratio of 3: 1: 0.006, heating to 800 deg.C in a high temperature furnace, maintaining for 20min, heating to 1500 deg.C again, maintaining for 30min, and quenching to obtain calcined product A, wherein CaCO in the raw material is calcined₃、SiO₂、Fe₂O₃The mass fractions are all more than or equal to 95 percent,

mixing the calcined substance A and CaO in a mass ratio of 1:1, and grinding the mixture into powder in a ball mill to obtain a cold-patch reactant, wherein the CaO is analytically pure and has a mass fraction of more than or equal to 99%;

2) preparation of reaction type cold patch asphalt liquid

Heating and softening matrix asphalt at 170 ℃, adding a diluent into the softened matrix asphalt solution, uniformly stirring at 100 ℃, and cooling to prepare a reactive cold patch asphalt solution, wherein the matrix asphalt is 80# A-grade road petroleum asphalt, the mass of the added diluent accounts for 20% of the mass of the mixed solution (the reactive cold patch asphalt solution), the diluent is obtained by uniformly mixing oleic acid, palmitic acid and lauric acid according to the mass ratio of 3: 1, the palmitic acid, the oleic acid and the lauric acid are industrial acids, the acid value of the palmitic acid is 220mg/g, the iodine value is less than or equal to 0.5%, and the content of the palmitic acid is more than or equal to 99%; the oleic acid value is 190-203mg/g, the saponification value is 90-205mg/g, the iodine value is 80-100g/100g, the freezing point is less than 4.0 ℃, and the water content is less than 0.5 percent; the acid value of lauric acid is 278-282mg/g, the saponification value is 279-283mg/g, and the iodine value is less than 0.5 percent;

3) preparation of chemical reaction type cold-patch asphalt mixture

Heating mineral aggregates with different particle sizes to 120 ℃, heating and softening the reaction type cold patch asphalt liquid at the temperature of 140 ℃, and placing the reaction type cold patch asphalt liquid in a 100 ℃ oven for heat preservation;

mixing and stirring the mineral aggregates with different particle sizes in the oven for 60s at 100 ℃ according to a set gradation so as to uniformly mix the coarse mineral aggregates and the fine mineral aggregates to obtain a mineral aggregate mixture, wherein the mineral aggregates are limestone and diabase, and the mineral aggregate mixture is prepared according to the gradation 2 in the table 1 after mixing the two mineral aggregates with each particle size according to the mass ratio of 1: 1;

and mixing and stirring the reactive cold patch asphalt liquid in the oven and the mineral aggregate mixture for 90 seconds at the temperature of 100 ℃, uniformly mixing, then adding a cold patch reactant accounting for 1% of the mass of the mineral aggregate mixture, stirring for 60 seconds, uniformly mixing, cooling the mixture to room temperature to obtain a chemical reactive cold patch asphalt mixture, and hermetically storing the obtained chemical reactive cold patch asphalt mixture to inhibit chemical reactions in the asphalt mixture and ensure that the asphalt mixture has good storage performance at normal temperature.

The specific construction method of the chemical reaction type cold patch asphalt mixture comprises the following steps:

when repairing the pavement pit slot, the chemical reaction type cold-patch asphalt mixture of the embodiment is poured into the cleaned pit slot, and the traffic can be opened after half an hour of uniform watering and compacting according to the proportion of adding 500ml of water into each kilogram of cold patch materials.

The performance of the chemical reaction type cold patch asphalt mixture of the embodiment is tested with reference to JTT 972-.

The detection proves that the initial Marshall stability of the chemical reaction type cold-patch asphalt mixture can reach 8kN, the Marshall stability after 7 days can exceed 11kN, the water stability reaches 90.8 percent, and the penetration strength reaches 2.84 MPa.

Example 4

A preparation method of a chemical reaction type cold patch asphalt mixture specifically comprises the following steps:

1) preparation of cold-patch reactant

Mixing CaCO₃、SiO₂With Fe₂O₃Mixing completely at a molar ratio of 3: 1: 0.006, heating to 800 deg.C in a high temperature furnace, maintaining for 20min, heating to 1500 deg.C again, maintaining for 30min, and quenching to obtain calcined product A, wherein CaCO in the raw material is calcined₃、SiO₂、Fe₂O₃The mass fractions are all more than or equal to 95 percent,

mixing the calcined substance A and CaO in a mass ratio of 1:1, and grinding the mixture into powder in a ball mill to obtain a cold-patch reactant, wherein the CaO is analytically pure and has a mass fraction of more than or equal to 99%;

2) preparation of reaction type cold patch asphalt liquid

Heating and softening matrix asphalt at 170 ℃, adding a diluent into the softened matrix asphalt solution, uniformly stirring at 100 ℃, and cooling to prepare a reactive cold patch asphalt solution, wherein the matrix asphalt is 80# A-grade road petroleum asphalt, the mass of the added diluent accounts for 25% of the mass of the mixed solution (the reactive cold patch asphalt solution), the diluent is obtained by uniformly mixing oleic acid, palmitic acid and lauric acid according to the mass ratio of 3: 1, the palmitic acid, the oleic acid and the lauric acid are industrial acids, the acid value of the palmitic acid is 220mg/g, the iodine value is less than or equal to 0.5%, and the content of the palmitic acid is more than or equal to 99%; the oleic acid value is 190-203mg/g, the saponification value is 90-205mg/g, the iodine value is 80-100g/100g, the freezing point is less than 4.0 ℃, and the water content is less than 0.5 percent; the acid value of lauric acid is 278-282mg/g, the saponification value is 279-283mg/g, and the iodine value is less than 0.5 percent;

3) preparation of chemical reaction type cold-patch asphalt mixture

Heating mineral aggregates with different particle sizes to 120 ℃, heating and softening the reaction type cold patch asphalt liquid at the temperature of 140 ℃, and placing the reaction type cold patch asphalt liquid in a 100 ℃ oven for heat preservation;

mixing and stirring the mineral aggregates with different particle sizes in the oven for 60s at 100 ℃ according to a set gradation so as to uniformly mix the coarse mineral aggregates and the fine mineral aggregates to obtain a mineral aggregate mixture, wherein the mineral aggregates are limestone and diabase, and the mineral aggregate mixture is prepared according to the gradation 5 in the table 1 after mixing the two mineral aggregates with each particle size according to the mass ratio of 1: 1;

and mixing and stirring the reactive cold patch asphalt liquid in the oven and the mineral aggregate mixture for 90 seconds at the temperature of 100 ℃, uniformly mixing, then adding a cold patch reactant accounting for 1% of the mass of the mineral aggregate mixture, stirring for 60 seconds, uniformly mixing, cooling the mixture to room temperature to obtain a chemical reactive cold patch asphalt mixture, and hermetically storing the obtained chemical reactive cold patch asphalt mixture to inhibit chemical reactions in the asphalt mixture and ensure that the asphalt mixture has good storage performance at normal temperature.

The specific construction method of the chemical reaction type cold patch asphalt mixture comprises the following steps:

when repairing the pavement pit slot, the chemical reaction type cold-patch asphalt mixture of the embodiment is poured into the cleaned pit slot, and the traffic can be opened after half an hour of uniform watering and compacting according to the proportion of adding 500ml of water into each kilogram of cold patch materials.

The performance of the chemical reaction type cold patch asphalt mixture of the embodiment is tested with reference to JTT 972-.

The detection proves that the initial Marshall stability of the chemical reaction type cold-patch asphalt mixture can reach 10kN, the Marshall stability after 7 days can exceed 14kN, the water stability reaches 91.8%, and the penetration strength reaches 2.96 MPa.

Example 5

A preparation method of a chemical reaction type cold patch asphalt mixture specifically comprises the following steps:

1) preparation of cold-patch reactant

Mixing CaCO₃、SiO₂With Fe₂O₃Mixing at a molar ratio of 3: 1: 0.006, and addingHeating to 800 deg.C in a high temperature furnace, maintaining the temperature for 20min, heating to 1500 deg.C again, maintaining the temperature for 30min, quenching the calcined product to obtain calcined product A, wherein CaCO in the calcined material₃、SiO₂、Fe₂O₃The mass fractions are all more than or equal to 95 percent,

mixing the calcined product A with Na₂CO₃Mixing according to the mass ratio of 1:1, putting the mixture into a ball mill, and grinding the mixture into powder to obtain the cold-patch reaction agent, wherein Na is₂CO₃The mass fraction is more than or equal to 99 percent for analytical purification;

2) preparation of reaction type cold patch asphalt liquid

Heating and softening matrix asphalt at 170 ℃, adding a diluent into the softened matrix asphalt solution, uniformly stirring at 100 ℃, and cooling to prepare a reactive cold patch asphalt solution, wherein the matrix asphalt is 70# A-grade road petroleum asphalt, the mass of the added diluent accounts for 20% of the mass of the mixed solution (the reactive cold patch asphalt solution), the diluent is obtained by uniformly mixing oleic acid, palmitic acid and lauric acid according to the mass ratio of 3: 1, the palmitic acid, the oleic acid and the lauric acid are industrial acids, the acid value of the palmitic acid is 220mg/g, the iodine value is less than or equal to 0.5%, and the content of the palmitic acid is more than or equal to 99%; the oleic acid value is 190-203mg/g, the saponification value is 90-205mg/g, the iodine value is 80-100g/100g, the freezing point is less than 4.0 ℃, and the water content is less than 0.5 percent; the acid value of lauric acid is 278-282mg/g, the saponification value is 279-283mg/g, and the iodine value is less than 0.5 percent;

3) preparation of chemical reaction type cold-patch asphalt mixture

Heating mineral aggregates with different particle sizes to 120 ℃, heating and softening the reaction type cold patch asphalt liquid at the temperature of 140 ℃, and placing the reaction type cold patch asphalt liquid in a 100 ℃ oven for heat preservation;

mixing and stirring the mineral aggregates with different particle sizes in the oven for 60s at 100 ℃ according to set gradation, so that the coarse mineral aggregates and the fine mineral aggregates are uniformly mixed to obtain a mineral aggregate mixture, wherein the mineral aggregate is basalt, and the set gradation of the mineral aggregates in the preparation of the mineral aggregate mixture is performed by selecting gradation 2 in the table 1;

and mixing and stirring the reactive cold patch asphalt liquid in the oven and the mineral aggregate mixture for 90 seconds at the temperature of 100 ℃, uniformly mixing, then adding a cold patch reactant accounting for 1% of the mass of the mineral aggregate mixture, stirring for 60 seconds, uniformly mixing, cooling the mixture to room temperature to obtain a chemical reactive cold patch asphalt mixture, and hermetically storing the obtained chemical reactive cold patch asphalt mixture to inhibit chemical reactions in the asphalt mixture and ensure that the asphalt mixture has good storage performance at normal temperature.

The specific construction method of the chemical reaction type cold patch asphalt mixture comprises the following steps:

when repairing the pavement pit slot, the chemical reaction type cold-patch asphalt mixture of the embodiment is poured into the cleaned pit slot, and the traffic can be opened after half an hour of uniform watering and compacting according to the proportion of adding 500ml of water into each kilogram of cold patch materials.

The performance of the chemical reaction type cold patch asphalt mixture of the embodiment is tested with reference to JTT 972-.

The detection proves that the initial Marshall stability of the chemical reaction type cold-patch asphalt mixture can reach 8kN, the Marshall stability after 7 days can exceed 12kN, the water stability reaches 89.1%, and the penetration strength reaches 3.10 MPa.

Example 6

A preparation method of a chemical reaction type cold patch asphalt mixture specifically comprises the following steps:

1) preparation of cold-patch reactant

Mixing CaCO₃、SiO₂With Fe₂O₃Mixing completely at a molar ratio of 3: 1: 0.006, heating to 800 deg.C in a high temperature furnace, maintaining for 20min, heating to 1500 deg.C again, maintaining for 30min, and quenching to obtain calcined product A, wherein CaCO in the raw material is calcined₃、SiO₂、Fe₂O₃The mass fractions are all more than or equal to 95 percent,

mixing the calcined product A with Na₂CO₃Mixing the components according to the mass ratio of 1:1, putting the mixture into a ball mill, and grinding the mixture into powder to obtain the cold-patch reaction agentWherein, Na₂CO₃The mass fraction is more than or equal to 99 percent for analytical purification;

2) preparation of reaction type cold patch asphalt liquid

Heating and softening matrix asphalt at 170 ℃, adding a diluent into the softened matrix asphalt solution, uniformly stirring at 100 ℃, and cooling to prepare a reactive cold patch asphalt solution, wherein the matrix asphalt is 70# A-grade road petroleum asphalt, the mass of the added diluent accounts for 20% of the mass of the mixed solution (the reactive cold patch asphalt solution), the diluent is obtained by uniformly mixing oleic acid, palmitic acid and lauric acid according to the mass ratio of 3: 1, the palmitic acid, the oleic acid and the lauric acid are industrial acids, the acid value of the palmitic acid is 220mg/g, the iodine value is less than or equal to 0.5%, and the content of the palmitic acid is more than or equal to 99%; the oleic acid value is 190-203mg/g, the saponification value is 90-205mg/g, the iodine value is 80-100g/100g, the freezing point is less than 4.0 ℃, and the water content is less than 0.5 percent; the acid value of lauric acid is 278-282mg/g, the saponification value is 279-283mg/g, and the iodine value is less than 0.5 percent;

3) preparation of chemical reaction type cold-patch asphalt mixture

Heating mineral aggregates with different particle sizes to 120 ℃, heating and softening the reaction type cold patch asphalt liquid at the temperature of 140 ℃, and placing the reaction type cold patch asphalt liquid in a 100 ℃ oven for heat preservation;

mixing and stirring the mineral aggregates with different particle sizes in the oven for 60s at 100 ℃ according to set gradation, so that the coarse mineral aggregates and the fine mineral aggregates are uniformly mixed to obtain a mineral aggregate mixture, wherein the mineral aggregate is basalt, and the set gradation of the mineral aggregates in the preparation of the mineral aggregate mixture is selected from gradation 5 in the table 1;

and mixing and stirring the reactive cold patch asphalt liquid in the oven and the mineral aggregate mixture for 90 seconds at the temperature of 100 ℃, uniformly mixing, then adding a cold patch reactant accounting for 1% of the mass of the mineral aggregate mixture, stirring for 60 seconds, uniformly mixing, cooling the mixture to room temperature to obtain a chemical reactive cold patch asphalt mixture, and hermetically storing the obtained chemical reactive cold patch asphalt mixture to inhibit chemical reactions in the asphalt mixture and ensure that the asphalt mixture has good storage performance at normal temperature.

The specific construction method of the chemical reaction type cold patch asphalt mixture comprises the following steps:

when repairing the pavement pit slot, the chemical reaction type cold-patch asphalt mixture of the embodiment is poured into the cleaned pit slot, and the traffic can be opened after half an hour of uniform watering and compacting according to the proportion of adding 500ml of water into each kilogram of cold patch materials.

The performance of the chemical reaction type cold patch asphalt mixture of the embodiment is tested with reference to JTT 972-.

The detection proves that the initial Marshall stability of the chemical reaction type cold-patch asphalt mixture can reach 7kN, the Marshall stability after 7 days can exceed 11kN, the water stability reaches 89.5%, and the penetration strength reaches 3.64 MPa.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.