阅读说明：本技术 一种煤间接液化残渣沥青混合料的制备方法 (Preparation method of coal indirect liquefied residue asphalt mixture ) 是由 季节 王哲 王子豪 韩秉烨 于 2021-10-14 设计创作，主要内容包括：本发明涉及一种煤间接液化残渣沥青混合料的制备方法,步骤一,测试煤间接液化残渣、沥青、集料、矿粉的各项性能指标；步骤二,采用马歇尔设计方法确定沥青混合料中沥青的最佳用量；步骤三,煤间接液化残渣以单一筛孔粒径、等体积的方式替换细集料,得到掺有煤间接液化残渣的集料；步骤四,将掺有煤间接液化残渣的集料、矿粉、沥青分别放置在烘箱内按照预设时间和预设温度进行预热；步骤五,将步骤四中预热后的集料、沥青、矿粉倒入拌合锅内拌合,最终制得煤间接液化残渣沥青混合料。本发明能够实现将煤间接液化残渣高附加值利用、变废为宝,混合料路用性能能够达到热拌沥青混合料的性能要求,具有明显的经济效益和和社会效益。(The invention relates to a preparation method of a coal indirect liquefaction residue asphalt mixture, comprising the following steps of testing various performance indexes of coal indirect liquefaction residue, asphalt, aggregate and mineral powder; determining the optimal amount of asphalt in the asphalt mixture by a Marshall design method; step three, replacing the fine aggregate with the coal indirect liquefaction residues in a mode of single sieve pore size and equal volume to obtain the aggregate doped with the coal indirect liquefaction residues; step four, respectively placing the aggregate, the mineral powder and the asphalt mixed with the coal indirect liquefaction residues in an oven for preheating according to preset time and preset temperature; and step five, pouring the aggregates, the asphalt and the mineral powder preheated in the step four into a mixing pot for mixing, and finally preparing the coal indirect liquefaction residue asphalt mixture. The invention can realize the high value-added utilization of the coal indirect liquefaction residues and change waste into valuable, the road performance of the mixture can meet the performance requirement of the hot-mix asphalt mixture, and the invention has obvious economic benefit and social benefit.)

1. A preparation method of coal indirect liquefaction residue asphalt mixture is characterized by comprising the following steps: the method comprises the following steps in sequence,

testing various performance indexes of coal indirect liquefaction residues, asphalt, aggregates and mineral powder, and ensuring that the performance indexes of the asphalt, the aggregates and the mineral powder used for preparing the asphalt mixture meet the related technical requirements in technical Specification for road asphalt pavement construction (JTG F40-2004);

secondly, selecting the type of the asphalt, and determining the optimal amount of the asphalt in the asphalt mixture by adopting a Marshall design method;

step three, preparing aggregates and mineral powder according to AC-20 median gradation, wherein fine aggregates in A-grade sieve pores in the aggregates are replaced by coal indirect liquefaction residues in a mode of single sieve pore size and equal volume, and the aggregates doped with the coal indirect liquefaction residues are obtained;

step four, respectively placing the aggregate, the mineral powder and the asphalt mixed with the coal indirect liquefaction residues in an oven for preheating according to preset time and preset temperature;

and step five, pouring the aggregates preheated in the step four into a mixing pot, then adding the asphalt with the optimal dosage determined in the step two into the mixing pot, mixing according to the first preset mixing time until the first preset mixing time is reached, finally adding mineral powder and mixing according to the second preset mixing time, and finally preparing the coal indirect liquefaction residue asphalt mixture.

2. The method for preparing the coal indirect liquefaction residue asphalt mixture according to claim 1, which is characterized by comprising the following steps of: in the second step, the asphalt is SK-90 asphalt, and the optimal asphalt amount accounts for 4.3% of the total mass of the aggregate and the mineral powder.

3. The method for preparing the coal indirect liquefaction residue asphalt mixture according to claim 1, which is characterized by comprising the following steps of: and screening the coal indirect liquefaction residues in the third step by using a screening device, wherein the screening time is 8-12 min, the coal indirect liquefaction residues corresponding to the A-grade screen holes are obtained, and the screening device is a continuous-grade formula screen.

4. The method for preparing the coal indirect liquefaction residue asphalt mixture according to claim 1, which is characterized by comprising the following steps of: the volume substitution mode in the third step is that on the premise that the densities of the coal indirect liquefaction residues and the natural fine aggregates are known, the coal indirect liquefaction residues with corresponding mass are added through mass conversion to enable the coal indirect liquefaction residues to be equal to the volumes of the substituted natural fine aggregates.

5. The method for preparing the coal indirect liquefaction residue asphalt mixture according to claim 1, which is characterized by comprising the following steps of: the size of the mesh of the grade A in the step three is 2.36mm or 1.18 mm.

6. The method for preparing the coal indirect liquefaction residue asphalt mixture according to claim 1, which is characterized by comprising the following steps of: in the fourth step, the preset temperature of the aggregate doped with the coal indirect liquefaction residues in the oven is 165 ℃, the preheating time is 4 hours, the preheating temperature of the mineral powder in the oven is 155 ℃, the preheating time is 4 hours, the preheating temperature of the asphalt in the oven is 160 ℃, and the preheating time is 2 hours.

7. The method for preparing the coal indirect liquefaction residue asphalt mixture according to claim 1, which is characterized by comprising the following steps of: in the fifth step, the heating temperature of the mixing pot is 165 ℃, and the first preset mixing time and the second preset mixing time are both 90 s.

8. The method for preparing the coal indirect liquefaction residue asphalt mixture according to claim 1, which is characterized by comprising the following steps of: the coal indirect liquefaction residue is used for replacing the natural fine aggregate of the grade by 100 percent of equivalent volume.

9. The method for preparing the coal indirect liquefaction residue asphalt mixture according to claim 1, which is characterized by comprising the following steps of: the adopted AC-20 median gradation is that the coarse aggregate with the diameter of 4.75 mm-26.5 mm accounts for 59 percent by mass, wherein the sieve openings with the diameter of 19mm, 16mm, 13.2mm, 9.5mm and 4.75mm account for 5 percent, 10 percent, 14 percent, 10 percent and 20 percent respectively; the mass percentage of fine aggregates of 0.075-4.75 mm is 36%, wherein the mass percentage of screen holes of 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm is 11%, 7.5%, 6.5%, 5%, 2.5% and 3.5% respectively; the mass percentage of the mineral powder is 5 percent.

10. The method for preparing the coal indirect liquefaction residue asphalt mixture according to claim 9, characterized by comprising the following steps: the coarse aggregate, the fine aggregate and the mineral powder are all limestone.

Technical Field

The invention relates to the technical field of preparation of road building materials, in particular to a preparation method of a coal indirect liquefied residue asphalt mixture.

Background

The indirect coal liquefaction technology is a process of gasifying, decarbonizing, desulfurizing and the like, then performing Fischer-Tropsch synthesis to generate a series of alkane and olefin compounds, and then performing tail gas treatment and product refining to obtain qualified oil products and chemical products. However, in the process of preparing oil products by coal liquefaction, an Indirect Coal Liquefaction Residue (ICLR), which is a byproduct accounting for about 20-30% of the raw coal, is inevitably generated. The mineral and chemical compositions of the coal indirect liquefaction residues are mainly rock-phase substances, wax residues and the like of gasification furnace slag, and have certain similarity with mineral components such as fly ash, incineration furnace slag and the like.

In the prior art, research on coal indirect liquefaction residues is carried out, wherein the octopiromyces and the like take the coal indirect liquefaction residues as raw materials and quicklime, cement, gypsum and the like as auxiliary materials, and baking-free bricks which meet the requirements of national standards and have good performances are prepared under the condition of steam curing at 100 ℃. The Zhang Long takes coal indirect liquefaction residues as experimental base materials, the porous ceramic materials are obtained by firing under different pore-forming agents and binders, and microscopic morphology characterization is carried out on products under different reference material ratios through a scanning electron microscope, so that the ceramic products with excellent performance and a microporous structure can be used for metal wastewater ion treatment, dust removal and gas purification.

The invention patent of application No. CN213671080U discloses a production unit for comprehensive utilization of coal indirect liquefaction residues, which is used for improving the utilization rate of the coal indirect liquefaction residues and avoiding component loss and waste in the residues in the production process, the invention patent of application No. CN203222714U discloses a hexagonal or octagonal coal indirect liquefaction residue water seepage brick with strip-shaped anti-slip grooves on the surface, a gap can be formed during laying so as to facilitate rainwater to be drained into soil, the invention patent of application No. CN103172320A discloses a coal indirect liquefaction residue baking-free brick and a production method thereof, the produced brick body is not easy to deform, crack and shrink, the brick surface is smooth and attractive, and residue reutilization is realized.

In addition, the construction of asphalt pavement engineering needs a large amount of natural gravel aggregates, but nowadays, the shortage of gravel and the rise of price are violent, and the development of highway construction is restricted to a certain extent, so that a material capable of replacing the natural gravel aggregates in asphalt mixtures needs to be researched. The indirect coal liquefaction residue particles are different in size and have certain gradation, the indirect coal liquefaction residue particles have the possibility of being used as aggregates and admixtures in the production process of asphalt concrete, and if the indirect coal liquefaction residue can be applied to road engineering instead of sandstone aggregates, the indirect coal liquefaction residue can be recycled, the indirect coal liquefaction residue can be changed into valuable, the highway construction cost can be saved, the construction of national traffic infrastructures is assisted, and the indirect coal liquefaction residue particles have great economic and social benefits.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the preparation method of the coal indirect liquefaction residue asphalt mixture, which can realize the high value-added utilization of the coal indirect liquefaction residue and change waste into valuable, the pavement performance of the mixture can meet the performance requirement of the hot-mix asphalt mixture, and the high-temperature performance and the water stability performance of the mixture are superior to those of the hot-mix asphalt mixture, so that the preparation method has obvious economic benefit and social benefit.

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

a preparation method of coal indirect liquefied residue asphalt mixture comprises the following steps in sequence,

testing various performance indexes of coal indirect liquefaction residues, asphalt, aggregates and mineral powder, and ensuring that the performance indexes of the asphalt, the aggregates and the mineral powder used for preparing the asphalt mixture meet the related technical requirements in technical Specification for road asphalt pavement construction (JTG F40-2004);

secondly, selecting the type of the asphalt, and determining the optimal amount of the asphalt in the asphalt mixture by adopting a Marshall design method;

step three, preparing aggregates and mineral powder according to AC-20 median gradation, wherein fine aggregates in A-grade sieve pores in the aggregates are replaced by coal indirect liquefaction residues in a mode of single sieve pore size and equal volume, and the aggregates doped with the coal indirect liquefaction residues are obtained;

step four, respectively placing the aggregate, the mineral powder and the asphalt mixed with the coal indirect liquefaction residues in an oven for preheating according to preset time and preset temperature;

and step five, pouring the aggregates preheated in the step four into a mixing pot, then adding the asphalt with the optimal dosage determined in the step two into the mixing pot, mixing according to the first preset mixing time until the first preset mixing time is reached, finally adding mineral powder and mixing according to the second preset mixing time, and finally preparing the coal indirect liquefaction residue asphalt mixture.

In any of the above schemes, preferably, in the second step, the asphalt is SK-90 asphalt, and the optimal asphalt amount accounts for 4.3% of the total mass of the aggregate and the mineral powder.

In any of the above schemes, preferably, in the third step, the coal indirect liquefaction residues are screened by a screening device, the screening time is 8-12 min, the coal indirect liquefaction residues corresponding to the grade a sieve pores are obtained, and the screening device is a continuous-grade formula pore sieve.

In any of the above schemes, preferably, the volume substitution in the step three is carried out by adding the coal indirect liquefaction residue with corresponding mass through mass conversion to make the volume of the coal indirect liquefaction residue equal to the volume of the substituted natural fine aggregate on the premise that the densities of the coal indirect liquefaction residue and the natural fine aggregate are known.

In any of the above solutions, it is preferable that the size of the mesh of the grade a in the step three is 2.36mm or 1.18 mm.

In any of the above schemes, preferably, in the fourth step, the preset temperature of the aggregate doped with the coal indirect liquefaction residue in the oven is 165 ℃, the preheating time is 4 hours, the preheating temperature of the mineral powder in the oven is 155 ℃, the preheating time is 4 hours, the preheating temperature of the asphalt in the oven is 160 ℃, and the preheating time is 2 hours.

In any of the above schemes, preferably, in the fifth step, the heating temperature of the mixing pot is 165 ℃, and the first preset mixing time and the second preset mixing time are both 90 s.

In any of the above schemes, it is preferable that the coal indirect liquefaction residue is substituted for the natural fine aggregate of the grade by 100% in equal volume.

In any of the above schemes, the adopted AC-20 median gradation is that the mass proportion of coarse aggregates with the diameter of 4.75 mm-26.5 mm is 59 percent, wherein the mass proportion of screen holes with the diameter of 19mm, 16mm, 13.2mm, 9.5mm and 4.75mm is respectively 5 percent, 10 percent, 14 percent, 10 percent and 20 percent; the mass percentage of fine aggregates of 0.075-4.75 mm is 36%, wherein the mass percentage of screen holes of 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm is 11%, 7.5%, 6.5%, 5%, 2.5% and 3.5% respectively; the mass percentage of the mineral powder is 5 percent.

In any of the above embodiments, preferably, the coarse aggregate, the fine aggregate and the mineral powder are limestone.

Compared with the prior art, the preparation method of the coal indirect liquefaction residue asphalt mixture provided by the invention has the following beneficial effects:

the coal indirect liquefaction residue asphalt mixture can realize high added value utilization of coal indirect liquefaction residues and change waste into valuable, the operation links are convenient and clear, the preparation of the coal indirect liquefaction residue asphalt mixture is realized through the combination of raw material proportion and step parameters, the design idea is unique, the process is simple, the pavement performance of the mixture can meet the performance requirement of a hot-mix asphalt mixture, the high-temperature performance and the water stability performance are superior to those of the hot-mix asphalt mixture, the pavement performance is good, and the economic benefit and the social benefit are obvious.

Drawings

FIG. 1 is a schematic flow chart of a preparation method of a coal indirect liquefaction residue asphalt mixture provided by the invention.

Detailed Description

In order that the invention may be further understood, the invention will now be described in detail with reference to specific examples.

As shown in fig. 1, an embodiment of the method for preparing a coal indirect liquefied residue asphalt mixture according to the present invention includes the following steps in sequence,

testing various performance indexes of coal indirect liquefaction residues, asphalt, aggregates and mineral powder, and ensuring that the performance indexes of the asphalt, the aggregates and the mineral powder used for preparing the asphalt mixture meet the related technical requirements in technical Specification for road asphalt pavement construction (JTG F40-2004);

secondly, selecting the type of the asphalt, and determining the optimal amount of the asphalt in the asphalt mixture by adopting a Marshall design method;

step three, preparing aggregates and mineral powder according to AC-20 median gradation, wherein when the aggregates are prepared, fine aggregates with A-grade sieve pores in the aggregates are replaced by coal indirect liquefaction residues in a mode of single sieve pore size and equal volume, and natural aggregates doped with the coal indirect liquefaction residues are obtained;

step four, respectively placing the aggregate, the mineral powder and the asphalt mixed with the coal indirect liquefaction residues in an oven for preheating according to preset time and preset temperature;

and step five, pouring the aggregates preheated in the step four into a mixing pot, then adding the asphalt with the optimal dosage determined in the step two into the mixing pot, mixing according to the first preset mixing time until the first preset mixing time is reached, finally adding mineral powder and mixing according to the second preset mixing time, and finally preparing the coal indirect liquefaction residue asphalt mixture.

In the second step, the asphalt is SK-90 asphalt, and the optimal asphalt amount accounts for 4.3% of the total mass of the aggregate and the mineral powder.

Specifically, the asphalt dosage a corresponding to the bulk density of the SK-90 asphalt mixture₁4.3 percent of SK-90 asphalt dosage a corresponding to the maximum value of stability₂4.2 percent, and the corresponding SK-90 asphalt dosage a when the target void ratio is 4 percent₃4.3 percent of SK-90 dosage a corresponding to the median saturation value of asphalt₄When the average value is 4.6%, the average value is determined as OAC₁(a1+ a2+ a3+ a 4)/4.35%. When the asphalt consumption is 3.7-4.8%, all indexes meet the related technical standards in JTG F40-2004 technical Specification for road asphalt pavement construction, and at the moment, the OAC_min＝3.8％，OAC_max4.8%, average value OAC thereof₂＝(OAC_min+OAC_max) And/2 is 4.3%. Collecting OAC₁And OAC₂The average value of (A) is used as the calculated optimum amount of asphalt OAC (OAC) of SK-90₁+OAC₂)/2＝4.3％。

And screening the coal indirect liquefaction residues in the third step by using a screening device, wherein the screening time is 8-12 min, the coal indirect liquefaction residues corresponding to the A-grade screen holes are obtained, and the screening device is a continuous-grade formula screen.

The volume substitution mode in the third step is that on the premise that the densities of the coal indirect liquefaction residues and the natural fine aggregates are known, the coal indirect liquefaction residues with corresponding mass are added through mass conversion to enable the coal indirect liquefaction residues to be equal to the volumes of the substituted natural fine aggregates.

Preferably, the size of the mesh of the grade A in the step three is 2.36mm or 1.18 mm.

Specifically, the density of the coal indirect liquefaction residue at 25 ℃ is 2.52g/cm²(based on the measured value of the test), the density of the natural fine aggregate is 2.78g/cm³The passing rates of 2.36mm and 1.18mm sieve holes corresponding to the AC-20 median gradation are 11% and 7.5%, respectively (based on the measured values of the tests), so that in the case of substitution with the same volume, the mass ratio of the coal indirect liquefaction residues is 90.65% of the mass of the corresponding natural fine aggregates.

The coal indirect liquefaction residue is used for replacing the natural fine aggregate of the grade by 100 percent of equivalent volume.

In the fourth step, the preset temperature of the aggregate doped with the coal indirect liquefaction residues in the oven is 165 ℃, the preheating time is 4 hours, the preheating temperature of the mineral powder in the oven is 155 ℃, the preheating time is 4 hours, the preheating temperature of the asphalt in the oven is 160 ℃, and the preheating time is 2 hours.

In the fifth step, the heating temperature of the mixing pot is 165 ℃, and the first preset mixing time and the second preset mixing time are both 90 s.

The coal indirect liquefied residue asphalt mixture comprises coarse aggregates, fine aggregates, mineral powder, asphalt and coal indirect liquefied residues, wherein the AC-20 median gradation adopted by the mixture is that the mass proportion of the coarse aggregates of 4.75 mm-26.5 mm is 59%, and the sieve pore proportions of each grade of 19mm, 16mm, 13.2mm, 9.5mm and 4.75mm are respectively 5%, 10%, 14%, 10% and 20%; the mass percentage of fine aggregates of 0.075-4.75 mm is 36%, wherein the mass percentage of screen holes of 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm is 11%, 7.5%, 6.5%, 5%, 2.5% and 3.5% respectively; the mass percentage of the mineral powder is 5 percent.

Furthermore, the coarse aggregate, the fine aggregate and the mineral powder are all limestone.

It should be noted that both the coal indirect liquefaction residue and the coal direct liquefaction residue belong to two different substances. The coal indirect liquefaction residue adopted by the embodiment is a byproduct generated by coal under the indirect liquefaction process technology, is hard in texture, has density similar to that of natural sand stone, and cannot be melted at high temperature, so that the asphalt is not modified by adding the coal indirect liquefaction residue into asphalt, but the whole asphalt mixture can be modified by adding the coal indirect liquefaction residue into the mixture, namely the high-temperature deformation resistance and the water damage resistance of the asphalt mixture can be obviously improved under the condition that the low-temperature performance of the asphalt mixture is not reduced.

The coal direct liquefaction residue is a byproduct generated by coal in a direct liquefaction process technology, is light and crisp in texture and close to asphalt in density, can be melted at high temperature, can be added into a matrix to play a role in asphalt modification, and is further mixed with mineral aggregate to form a modified asphalt mixture.

The following will explain the concrete test. In the first step, various performance indexes of the coal indirect liquefaction residues, the asphalt, the aggregate and the mineral powder are tested, and the results are shown in tables 1 to 6.

TABLE 1 Properties of SK-90 Pitch

Item	Unit of	Test results	Technical requirements	Test method
					Penetration (25 ℃,5s,100g)	0.1mm	85	80-100	T0604
Softening point (R)&B)	℃	56	≥45	T0606
					Ductility at 10 DEG C	cm	53.2	≥20	T0605
Dynamic viscosity at 60 DEG C	Pa.s	215.7	≥160	T0620
					Change in mass	％	±0.1	±0.8	T0608
Residual penetration ratio (25 ℃ C.)	％	63.9	≥57	T0604
					Residual ductility (10 ℃ C.)	cm	8.1	≥8	T0605

TABLE 2 elemental analysis of coal indirect liquefaction residues

Index (I)

Apparent density (25 ℃ C.)

C

H

N

S

Weight loss ratio

Coal indirect liquefaction residue

2.52g/cm3

15％

40.5％

0

20.7％

8.81％

Note: the weight loss rate is the mass loss after burning for 2 hours at 800 ℃ by adopting an ash content determination method in GB/T212-2008.

TABLE 3 compositional analysis of coal indirect liquefaction residue

TABLE 4 Performance test results for coarse and fine aggregates

Performance test results of fine aggregates of 50-2.36 mm in Table

Test items	Test results	Technical index
			Apparent relative density	2.78	≥2.60
Bulk relative density	2.68	—
			Angular/s	43.2	≥30
Sand equivalent/%	65.0	≥60

TABLE 6 mineral powder Performance test results

Various indexes of SK-90 asphalt, coarse aggregate, fine aggregate and mineral powder all meet the related technical requirements of No. 90 asphalt in technical Specification for road asphalt pavement construction (JTG F40-2004). The performance indexes of the coarse aggregate, the fine aggregate and the mineral powder meet the related technical requirements in road engineering aggregate test regulations (JTG E42-2005).

SK-90 asphalt is selected, and the optimal asphalt dosage of the SK-90 asphalt mixture is determined to be 4.3% by adopting a Marshall design method.

The invention adopts the coal indirect liquefaction residues with 2.36mm or 1.18mm screen holes to respectively prepare the asphalt mixture, keeps the gradation passing rate unchanged, measures the using amount of the coal indirect liquefaction residues corresponding to the 2.36mm or 1.18mm screen holes, respectively replaces the coal indirect liquefaction residues with single grain diameter and equal volumeThe natural fine aggregate corresponding to the AC-20 grading median is removed, and the apparent density of the coal indirect liquefaction residue is 2.52g/cm³(because of slight difference in material source, the actual operation is based on the measured value), the apparent density of the natural fine aggregate is 2.78g/cm³(because of slight difference in material sources, the actual operation is based on the measured value), the composition of the AC-20 aggregate after replacing the fine aggregate is shown in Table 6.

TABLE 6 composition of AC-20 aggregates after replacement of fine aggregates by coal indirect liquefaction residues

The aggregates for the first grading test and the second grading test are respectively weighed, the aggregates corresponding to the first grading test and the second grading test are respectively preset in a 165 ℃ oven for 4 hours at constant temperature, SK-90 asphalt is preheated in a 160 ℃ oven for 2 hours, and mineral powder is preheated in a 155 ℃ oven for 4 hours.

And (3) preparing asphalt mixtures corresponding to the first gradation and the second gradation respectively, wherein the preparation methods are the same, and the preparation description is given by taking the first gradation as an example. Adjusting the temperature of the mixing pot to 165 ℃, taking out the corresponding aggregate of the gradation, pouring the aggregate into the mixing pot, pouring SK-90 asphalt with determined dosage, mixing for 90s, then adding mineral powder, mixing for 90s, and preparing the mixture of the coal indirect liquefied residue asphalt, wherein all performance indexes of Marshall test pieces prepared by the two methods are shown in Table 8.

TABLE 8 Marshall experiment results for coal indirect liquefaction residue asphalt mixture

The pavement performance of the coal indirect liquefied residue asphalt mixture is verified, and the test results are shown in tables 9 to 11.

TABLE 9 high-temperature Properties of coal-indirect liquefied residue asphalt mixture

Mix type	45min rut depth (mm)	60min rut depth (mm)	Degree of dynamic stability (times/mm)
				SK-90 asphalt mixture	4.151	4.629	1318
Gradation-asphalt mixture	3.213	3.552	1858
				Gradation asphalt mixture	3.168	3.476	2045

TABLE 10 Low-temp. Properties of coal-indirect liquefied residue asphalt mixture

Mix type	Flexural tensile Strength (MPa)	Flexural stiffness modulus (MPa)	Low temperature strain to failure (mu epsilon)
				SK-90 asphalt mixture	8.38	3812	2215
Gradation-asphalt mixture	8.61	3563	2376
				Gradation asphalt mixture	8.76	3439	2387

TABLE 11 Water stability of coal indirect liquefied residue asphalt mixture

In conclusion, the AC-20 median gradation is adopted, and the natural fine aggregate corresponding to the grade is respectively replaced by the 2.36mm sieve pore and the 1.18mm sieve pore in equal volume to prepare the first-gradation asphalt mixture and the second-gradation asphalt mixture, and the performances of the first-gradation asphalt mixture and the second-gradation asphalt mixture meet the related technical standards in the technical Specification for constructing asphalt pavements in road engineering (JTG F40-2004).

The coal indirect liquefaction residue asphalt mixture is unique in design idea, simple in process, convenient and clear in operation links, the preparation of the coal indirect liquefaction residue asphalt mixture is realized through the combination of raw material proportion and step parameters, the coal indirect liquefaction residue is applied to road engineering instead of gravel aggregates, the road performance is good, the coal indirect liquefaction residue can be recycled, the road construction cost can be saved, and the economic and social values are important.

It will be understood by those skilled in the art that the present invention includes any combination of the summary and detailed description of the invention described above and those illustrated in the accompanying drawings, which is not intended to be limited to the details and which, for the sake of brevity of this description, does not describe every aspect which may be formed by such combination. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.