CN116040988B - Anti-freezing asphalt pavement composition and pavement construction method - Google Patents

Abstract

The application relates to the technical field of asphalt mixtures, and particularly discloses an antifreezing asphalt pavement composition and a pavement construction method. The antifreeze asphalt pavement composition comprises the following raw materials in parts by weight: 80-100 parts of emulsified asphalt, 70-110 parts of coarse aggregate, 180-260 parts of fine aggregate, 10-18 parts of stearic acid modified calcium sulfate whisker, 10-15 parts of aluminum powder, 6-10 parts of expanding agent, 5-10 parts of silane coupling agent and 1-3 parts of N-ethyl-p-toluenesulfonamide. The antifreeze asphalt pavement composition has excellent antifreeze performance and meets the market demand.

Description

Anti-freezing asphalt pavement composition and pavement construction method

Technical Field

The invention relates to the technical field of asphalt mixtures, in particular to an antifreezing asphalt pavement composition and a pavement construction method.

Background

With the rapid increase in traffic volume, the demand for road quality is also increasing. At present, in order to improve the smoothness of a pavement, so that the pavement is more suitable for high-speed traffic of vehicles, an asphalt concrete pavement is generally adopted.

However, in some areas of our country, the winter is long and cold, the summer is short and hot, the climate change is severe in spring and autumn, and the daily temperature difference and the annual temperature difference are large. Asphalt concrete pavement is subject to frequent freeze-thaw cycles in areas with large temperature differences. Frequent freeze-thaw cycles severely deteriorate the durability of asphalt concrete pavement. Moisture permeates into the interior of the pavement from voids in the asphalt concrete pavement. And when the temperature is lower than zero degree, the water permeated into the pavement is frozen, and the volume of the frozen water is increased, so that the void inside the asphalt concrete is frozen and swelled. Under the influence of repeated freeze thawing cycle, the gaps of the asphalt concrete pavement are greatly increased, so that more water enters the asphalt concrete pavement, and the asphalt mixture in the asphalt concrete pavement is caused to generate the phenomena of loose aggregate, particle falling, pit and the like. On the other hand, the water permeates into the asphalt concrete pavement base along the freeze-thawing expansion joint with large depth, so that the damage degree of the asphalt concrete pavement is increased, and the durability of the asphalt concrete pavement is further reduced. Therefore, it is urgent to develop an antifreeze asphalt pavement composition capable of improving the anti-freezing performance of asphalt concrete pavement.

Disclosure of Invention

In order to improve the freezing resistance of an asphalt concrete pavement, the application provides a freezing resistant asphalt pavement composition and a pavement construction method.

In a first aspect, the present application provides an antifreeze asphalt pavement composition, which adopts the following technical scheme.

The antifreeze asphalt pavement composition comprises the following raw materials in parts by weight: 80-100 parts of emulsified asphalt, 70-110 parts of coarse aggregate, 180-260 parts of fine aggregate, 10-18 parts of stearic acid modified calcium sulfate whisker, 10-15 parts of aluminum powder, 6-10 parts of expanding agent, 5-10 parts of silane coupling agent and 1-3 parts of N-ethyl-p-toluenesulfonamide.

By adopting the technical scheme, the antifreeze asphalt pavement composition has excellent antifreeze performance. The range of cracking index of the antifreeze asphalt pavement composition is 2-5%; the antifreeze rating ranges from F300 to > F400; the range of the brittle points is-34 to-26 ℃. Through the mutual synergistic effect of the raw materials in the antifreeze asphalt pavement composition, the antifreeze performance of the antifreeze asphalt pavement composition is obviously improved, and the market demand is met.

Applicants have found that low temperature cracking of asphalt concrete pavement is one of the major forms of pavement damage. The low-temperature cracking causes moisture to continuously enter the interior of the asphalt concrete pavement from the cracks, so that the low-temperature cracking phenomenon of the asphalt concrete pavement is further aggravated. At present, the brittle points are generally used for characterizing the performance of the antifreeze asphalt pavement composition at low temperature. Therefore, the interaction force between the raw materials in the anti-freezing asphalt pavement composition is improved, the anti-cracking performance is further improved, the brittle point is reduced, and the anti-freezing asphalt pavement composition is an effective way for improving the anti-freezing performance of asphalt concrete pavement.

In the application, the stearic acid modified calcium sulfate whisker is added into the antifreeze asphalt pavement composition, so that the antifreeze performance of the antifreeze asphalt pavement composition is improved. The calcium sulfate whisker has the advantages of high strength, high modulus and high toughness, integrates the advantages of reinforcing fibers and inorganic fillers, is easy to compound with polymers, and can improve the toughness, strength and crack resistance of the anti-freezing asphalt pavement composition and reduce the brittle points of the anti-freezing asphalt pavement composition when being added into the anti-freezing asphalt pavement composition. However, the compatibility between the calcium sulfate whiskers and the rest of the raw materials in the antifreeze asphalt pavement composition is poor. The stearic acid is used for modifying the calcium sulfate whisker, so that the stearic acid is coated on the surface of the calcium sulfate whisker, and the compatibility between the calcium sulfate whisker and the rest raw materials in the antifreeze asphalt pavement composition is enhanced. And calcium stearate films which are difficult to dissolve in water are easy to generate on the surfaces of the calcium sulfate whiskers, so that the cracking resistance of the antifreeze asphalt pavement composition is further improved.

In addition, N-ethyl-p-toluenesulfonamide and a silane coupling agent are also added into the antifreeze asphalt pavement composition. The addition of N-ethyl-p-toluenesulfonamide can effectively improve the toughness of emulsified asphalt, thereby improving the crack resistance of the antifreeze asphalt pavement composition. The interaction force exists between the polar group of the silane coupling agent and the polar group in the N-ethyl p-toluenesulfonamide, and meanwhile, the silane coupling agent can also generate intermolecular interaction force with the stearic acid modified calcium sulfate whisker, so that the interaction synergistic effect exists among the three, and further, the anti-cracking performance, the embrittlement point and the anti-freezing performance of the anti-freezing asphalt pavement composition are obviously improved.

Optionally, the emulsified asphalt comprises the following raw materials in parts by weight: 55-70 parts of asphalt, 1-3 parts of cationic emulsifier, 0.1-0.4 part of zwitterionic emulsifier, 2-4 parts of polyvinyl alcohol, 0.6-1 part of cellulose nanofiber, 5-8 parts of dimethyl sulfoxide, 0.01-0.05 part of thickener, 0.1-0.5 part of water reducer, 0.05-0.1 part of defoamer, 30-35 parts of water and 0.5-3 parts of alcohol.

By adopting the technical scheme, the polyvinyl alcohol and the cellulose nanofiber are added into the emulsified asphalt, gel is formed in the mixed solution of dimethyl sulfoxide and water, the emulsified asphalt has excellent toughness and low temperature resistance, and the mechanical property and the low temperature resistance of the emulsified asphalt can be improved by adding the polyvinyl alcohol nanofiber and the cellulose nanofiber into the emulsified asphalt, so that the freezing resistance of the freezing-resistant asphalt pavement composition is improved.

Optionally, the emulsified asphalt is prepared by the following method:

uniformly mixing 1/3 of the total amount of dimethyl sulfoxide and water, adding polyvinyl alcohol and cellulose nanofiber under stirring, continuously stirring for 20-30min, adding zwitterionic emulsifier under stirring, and stirring to uniformly mix to obtain a material I;

heating asphalt to 110-165 ℃ to obtain a material II;

adding a cationic emulsifier into the rest water to prepare soap solution, and heating to 45-50 ℃ to obtain a material III;

adding a water reducing agent and a defoaming agent into alcohol, stirring until the mixture is uniform, then adding a thickening agent under the stirring condition, and stirring until the mixture is uniform to obtain a material IV;

and respectively conveying the materials I, II, III and IV into a colloid mill, uniformly dispersing by the colloid mill to form an oil-in-water emulsion, and discharging the emulsion from the system when the temperature of the emulsion is reduced to 50-70 ℃ to obtain the emulsified asphalt.

Optionally, the zwitterionic emulsifier is one or more of N-tallow-beta-iminodipropionic acid disodium, N-lauryl-beta-aminopropionic acid and N-cocoyl-beta-aminopropionic acid.

Optionally, the alcohol is one or more of propanol, isopropanol and tert-butanol.

Optionally, the stearic acid modified calcium sulfate whisker comprises the following raw materials in parts by weight: 8-12 parts of stearic acid, 15-20 parts of calcium sulfate whisker and 100-120 parts of ethanol.

Through adopting above-mentioned technical scheme for the raw materials of stearic acid modified calcium sulfate whisker is simple easy-to-obtain, and through controlling stearic acid and calcium sulfate whisker's content, makes the modified calcium sulfate whisker hydrophilicity of stearic acid that obtains higher, when asphalt concrete pavement produced the crack, can reduce the infiltration of moisture to inside the asphalt concrete pavement, further improves the frost resistance of freezing-resistant asphalt pavement composition.

Optionally, the expanding agent is calcium sulfoaluminate expanding agent.

In a second aspect, the present application provides a pavement construction method, which adopts the following technical scheme.

A pavement construction method comprises the following steps:

step A: digging a groove;

and (B) step (B): paving a layer of stone with the grain diameter of 35+/-1 cm at the bottom of the groove to form a base layer;

step C: paving broken stone with the grain diameter of 3+/-1 cm on the surface of the base layer to form a cushion layer with the thickness of 12-15 cm;

step D: backfilling soil on the surface of the cushion layer, compacting to form a transition layer with the thickness of 4+/-1 cm;

step E: paving the antifreeze asphalt pavement composition of any one of the first aspect on the surface of the transition layer, compacting, and forming a surface layer with the thickness of 7-10 cm.

By adopting the technical scheme, the obtained asphalt concrete pavement has higher freezing resistance.

In summary, the present application has at least the following beneficial effects:

1. according to the antifreeze asphalt pavement composition, through the interaction synergistic effect among the stearic acid modified calcium sulfate whisker, the silane coupling agent and the N-ethyl-p-toluenesulfonamide, the interaction force among the raw materials of the antifreeze asphalt pavement composition is improved, so that the brittle points of the antifreeze asphalt pavement composition are reduced, the cracking resistance is improved, and the antifreeze performance of the antifreeze asphalt pavement composition is further improved;

2. in the emulsified asphalt in the antifreeze asphalt pavement composition, the antifreeze performance of the antifreeze asphalt pavement composition is further improved through the mutual synergistic effect between the polyvinyl alcohol and the cellulose nanofiber.

Detailed Description

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

Raw materials

Polyvinyl alcohol, model 2488; the model of the cellulose nanofiber is 9004-34-6; the emulsified asphalt of example 1, having a gauge 20200513, a penetration of 23mm, a ductility of 22cm, a softening point of 99 ℃, and a flash point of 99 ℃; the sulfonated melamine formaldehyde condensate water reducer is selected from Xingbang chemical building materials limited company in Suzhou; the model of the higher alcohol fatty acid ester is DSA-5; hydroxypropyl cellulose selected from the group consisting of gallery helch building materials, inc; the model of the calcium sulfate whisker is a superior product and is selected from Jinan green Yuan New Material Co., ltd; crushed stone with water content of 0.1% and clay content of 0.1% and selected from Jinzhou city spring premixed concrete Co., ltd; fine sand with bulk density of 1700kg/m ³ An apparent density of 1900kg/m ³ The porosity is 35%, the abrasion rate is 0.1%, the water content is 0.1%, the mud content is 0.1%, and the adsorption rate is 90%.

Preparation example I

Preparation example I-1

An emulsified asphalt is prepared by the following method:

uniformly mixing 6kg of dimethyl sulfoxide and 11kg of water, then adding 3kg of polyvinyl alcohol and 0.8kg of cellulose nanofiber under stirring, continuously stirring for 30min, then adding 0.2kg of zwitterionic surfactant under stirring, and stirring until uniformly mixing to obtain a material I, wherein the zwitterionic emulsifier is N-tallow-beta-iminodipropionate disodium;

heating 60kg of asphalt to 160 ℃ to obtain a material II;

adding 1.8kg of cationic emulsifier into 22kg of water to prepare soap solution, and heating to 45 ℃ to obtain a material III, wherein the cationic emulsifier is hexadecyl trimethyl ammonium chloride;

adding 0.2 water reducer and 0.08 defoamer into 2kg of alcohol, stirring until the mixture is uniform, then adding 0.02kg of thickener under stirring, and stirring until the mixture is uniform to obtain a material IV, wherein the water reducer is sulfonated melamine formaldehyde condensate, the defoamer is higher alcohol fatty acid ester, the alcohol is tertiary butanol, and the thickener is hydroxypropyl cellulose;

and respectively conveying the materials I, II, III and IV into a colloid mill, uniformly dispersing by the colloid mill to form an oil-in-water emulsion, and discharging the emulsion from the system when the temperature of the emulsion is reduced to 55 ℃ to obtain the emulsified asphalt.

Preparation example II

Preparation example II-1

The stearic acid modified calcium sulfate whisker is prepared by the following method:

adding 11kg of stearic acid into 110kg of ethanol, heating to 90 ℃ in a water bath, stirring under the condition of heating in the water bath until the mixture is uniform, then adding 16kg of calcium sulfate whisker under the stirring condition, stirring for 20min at the stirring speed of 2000r/min, filtering, discarding the filtrate, and drying the filter residue to obtain the stearic acid modified calcium sulfate whisker.

Examples

Example 1

An antifreezing asphalt pavement composition comprises the following raw materials: 90kg of emulsified asphalt, 100kg of coarse aggregate, 210kg of fine aggregate, 10kg of stearic acid modified calcium sulfate whisker prepared in preparation example II-1, 10kg of aluminum powder, 8kg of expanding agent, 6kg of silane coupling agent and 1kg of N-ethyl-p-toluenesulfonamide;

wherein, the emulsified asphalt is conventional commercial emulsified asphalt; the coarse aggregate is crushed stone; the fine aggregate is fine sand; the expanding agent is calcium sulfoaluminate (UEA) expanding agent; the silane coupling agent is vinyl triethoxysilane.

A method for preparing an antifreeze asphalt pavement composition, comprising the following steps:

stirring emulsified asphalt, stearic acid modified calcium sulfate whisker, an expanding agent, a silane coupling agent and N-ethyl-p-toluenesulfonamide until the emulsified asphalt, the stearic acid modified calcium sulfate whisker, the expanding agent, the silane coupling agent and the N-ethyl-p-toluenesulfonamide are uniformly mixed to obtain an asphalt premix;

adding fine aggregate into the asphalt premix, stirring for 10min at the rotating speed of 80r/min, then adding coarse aggregate, stirring for 15min at the rotating speed of 40r/min, then adding aluminum powder under the stirring condition, and stirring for 20min at the rotating speed of 50r/min to obtain the antifreeze asphalt pavement composition.

Example 2

An antifreeze asphalt pavement composition is provided, which is different from the embodiment 1 in that the emulsified asphalt is the emulsified asphalt prepared in the preparation example I-1, and the rest is the same as the embodiment 1.

Example 3

An antifreeze asphalt pavement composition is provided, which is different from the embodiment 2 in that polyvinyl alcohol is not added into emulsified asphalt prepared in the preparation example I-1, and the rest is the same as the embodiment 2.

Example 4

An antifreeze asphalt pavement composition is different from the embodiment 2 in that the emulsified asphalt prepared in the preparation example I-1 is not added with cellulose nanofiber, and the rest is the same as the embodiment 2.

Example 5

An antifreeze asphalt pavement composition is different from the embodiment 2 in that the emulsified asphalt prepared in the preparation example I-1 is not added with polyvinyl alcohol and cellulose nanofiber, and the rest is the same as the embodiment 2.

Example 6

An antifreeze asphalt pavement composition is provided, which is different from the embodiment 2 in that the swelling agent is an equal amount of a fibrous swelling agent, and the rest is the same as the embodiment 2.

Comparative example

Comparative example 1

An antifreeze asphalt pavement composition is different from the embodiment 1 in that stearic acid modified calcium sulfate whisker is not added into the raw material of the antifreeze asphalt pavement composition, and the rest is the same as the embodiment 1.

Comparative example 2

An antifreeze asphalt pavement composition is provided, which is different from the embodiment 1 in that the stearic acid modified calcium sulfate whisker is replaced by an equivalent amount of calcium sulfate whisker, and the rest is the same as the embodiment 1.

Comparative example 3

An antifreeze asphalt pavement composition is provided, which is different from the embodiment 1 in that N-ethyl-p-toluenesulfonamide is not added to the raw material of the antifreeze asphalt pavement composition, and the rest is the same as the embodiment 1.

Comparative example 4

A antifreeze asphalt pavement composition is provided, which is different from the embodiment 1 in that a silane coupling agent is not added to raw materials of the antifreeze asphalt pavement composition, and the rest is the same as the embodiment 1.

Comparative example 5

The antifreeze asphalt pavement composition is different from the embodiment 1 in that stearic acid modified calcium sulfate whisker, N-ethyl-p-toluenesulfonamide and a silane coupling agent are not added into the raw materials of the antifreeze asphalt pavement composition, and the rest is the same as the embodiment 1.

Performance test

The 11 anti-freeze asphalt pavement compositions prepared in examples 1-6 and comparative examples 1-5 were subjected to the following performance tests:

the cracking indexes of the 10 antifreezing asphalt pavement compositions are detected according to GB/T29417-2012 method for testing the drying shrinkage cracking performance of cement mortar and concrete;

the anti-freezing grade of the 11 anti-freezing asphalt pavement compositions is detected according to the water penetration resistance test in GB/T50082-2009 Standard of method for testing the long-term performance and durability of common concrete;

the embrittlement point of the antifreeze asphalt pavement composition of the above 11 was detected by a fray method using an asphalt embrittlement point tester, and the results are shown in table 1.

As can be seen from Table 1, the antifreeze asphalt pavement composition of the present application has excellent antifreeze performance. The range of cracking index of the antifreeze asphalt pavement composition is 2-5%; the antifreeze rating ranges from F300 to > F400; the range of the brittle points is-34 to-26 ℃. The antifreeze asphalt pavement composition remarkably improves the antifreeze performance through the mutual synergistic effect among the raw materials, and meets the market demand.

Comparing example 1 with example 2, the anti-freeze asphalt pavement composition prepared in example 1 has a cracking index of 4%; the freezing resistance grade is F300; the brittle point was-27 ℃. The cracking index of the antifreeze asphalt pavement composition prepared in the example 2 is 2%; the freeze rating is > F400; the brittle point was-34 ℃. The emulsified asphalt prepared in preparation example I-1 was used as the emulsified asphalt in example 2, and the emulsified asphalt in example 1 was a conventional commercially available emulsified asphalt. And the antifreeze asphalt pavement composition prepared in example 1 has increased cracking index, decreased antifreeze grade, and increased brittleness compared to the antifreeze asphalt pavement composition prepared in example 2. The emulsified asphalt prepared in the application has the advantage that the anti-freezing performance of the anti-freezing asphalt pavement composition is improved through the mutual synergistic effect between the raw materials.

Comparing examples 3-5 with example 2, the anti-freeze asphalt pavement composition prepared in example 2 has a cracking index of 2%; the freeze rating is > F400; the brittle point was-34 ℃. The cracking index of the antifreeze asphalt pavement composition prepared in the example 3 is 4%; the freezing resistance grade is F350; the brittle point was-31 ℃. The cracking index of the antifreeze asphalt pavement composition prepared in the example 4 is 3%; the freezing resistance grade is F350; the brittle point was-30 ℃. The cracking index of the antifreeze asphalt pavement composition prepared in the example 5 is 5%; the freezing resistance grade is F300; the brittle point was-26 ℃. In example 3, the raw material of the emulsified asphalt was not added with polyvinyl alcohol, in example 4, the raw material of the emulsified asphalt was not added with cellulose nanofibers, and in example 5, the raw material of the emulsified asphalt was not added with polyvinyl alcohol and cellulose nanofibers, as compared with example 2. And the anti-freeze asphalt pavement compositions prepared in example 3 and example 4 have an increased cracking index, a decreased anti-freeze grade, and an increased brittle point, as compared to the anti-freeze asphalt pavement composition prepared in example 2. Furthermore, the crack index of the antifreeze asphalt pavement composition prepared in example 5 is further increased, the antifreeze grade is further decreased, and the embrittlement point is further increased, compared with examples 3 and 4. The mutual synergistic effect of the emulsified asphalt prepared in the application and the polyvinyl alcohol and the cellulose nanofiber is shown, so that the freezing resistance of the freezing-resistant asphalt pavement composition is improved.

Comparing comparative example 1 with example 1, the crack index of the antifreeze asphalt pavement composition prepared in example 1 is 4%; the freezing resistance grade is F300; the brittle point was-27 ℃. The cracking index of the antifreeze asphalt pavement composition prepared in comparative example 1 is 12%; the freezing resistance grade is F100; the brittle point was-12 ℃. Compared with example 1, the antifreeze asphalt pavement composition of comparative example 1 has no stearic acid modified calcium sulfate whisker added to the raw material, so that the cracking index of the antifreeze asphalt pavement composition is increased, the antifreeze grade is reduced, and the brittle point is increased. The addition of the stearic acid modified calcium sulfate whisker is helpful for improving the freezing resistance of the freezing-resistant asphalt pavement composition.

Comparing comparative example 2 with example 1, the anti-freeze asphalt pavement composition prepared in example 1 has a cracking index of 4%; the freezing resistance grade is F300; the brittle point was-27 ℃. The crack index of the antifreeze asphalt pavement composition prepared in comparative example 2 is 10%; the freezing resistance grade is F150; the brittle point was-15 ℃. Compared with example 1, the antifreeze asphalt pavement composition of comparative example 2 has the advantages that the equivalent amount of calcium sulfate whisker is used for replacing stearic acid modified calcium sulfate whisker in the raw materials of the antifreeze asphalt pavement composition, so that the cracking index of the antifreeze asphalt pavement composition is increased, the antifreeze grade is reduced, and the brittleness is increased. The modification of the calcium sulfate whisker by stearic acid is helpful for improving the freezing resistance of the freezing-resistant asphalt pavement composition.

Comparing comparative example 3 with example 1, the anti-freeze asphalt pavement composition prepared in example 1 has a cracking index of 4%; the freezing resistance grade is F300; the brittle point was-27 ℃. The crack index of the antifreeze asphalt pavement composition prepared in the comparative example 3 is 10%; the freezing resistance grade is F150; the brittle point was-16 ℃. Compared with example 1, the raw material of the antifreeze asphalt pavement composition of the comparative example 3 is not added with N-ethyl-p-toluenesulfonamide, so that the cracking index of the antifreeze asphalt pavement composition is increased, the antifreeze grade is reduced, and the brittle point is increased. The addition of N-ethyl-p-toluenesulfonamide is helpful for improving the freezing resistance of the freezing-resistant asphalt pavement composition.

Comparing comparative example 4 with example 1, the anti-freeze asphalt pavement composition prepared in example 1 has a cracking index of 4%; the freezing resistance grade is F300; the brittle point was-27 ℃. The cracking index of the antifreeze asphalt pavement composition prepared in comparative example 4 is 9%; the freezing resistance grade is F200; the brittle point was-19 ℃. Compared with example 1, the raw materials of the antifreeze asphalt pavement composition in comparative example 4 are not added with the silane coupling agent, so that the cracking index of the antifreeze asphalt pavement composition is increased, the antifreeze grade is reduced, and the brittle points are increased. The addition of the silane coupling agent is described to help improve the frost resistance of the frost resistant asphalt pavement composition.

Comparing comparative example 5 with example 1, the crack index of the antifreeze asphalt pavement composition prepared in example 1 is 4%; the freezing resistance grade is F300; the brittle point was-27 ℃. The cracking index of the antifreeze asphalt pavement composition prepared in comparative example 5 is 14%; freeze rating < F100; the brittle point was-9 ℃. Compared with example 1, the antifreeze asphalt pavement composition of comparative example 5 has the advantages that the raw materials of the antifreeze asphalt pavement composition are not added with stearic acid modified calcium sulfate whisker, a silane coupling agent and N-ethyl-p-toluenesulfonamide, so that the cracking index of the antifreeze asphalt pavement composition is increased, the antifreeze grade is reduced, and the brittleness is increased. In combination with comparative examples 1, 3 and 4, it can be seen that the antifreeze performance of the antifreeze asphalt pavement composition of comparative example 5 has further reduced compared with the antifreeze asphalt pavement composition prepared in comparative examples 1, 3 and 4, and the synergistic effect of calcium sulfate whisker, a silane coupling agent and N-ethyl-p-toluenesulfonamide is shown.

Application example

Application examples 1 to 6

The pavement construction method of application examples 1-6 comprises the following steps:

step A: digging a groove by using an excavator according to a design drawing;

and (B) step (B): paving a layer of stone with the grain diameter of 35+/-1 cm at the bottom of the groove to form a base layer;

step C: paving broken stone with the grain diameter of 3+/-1 cm on the surface of the base layer to form a cushion layer with the thickness of 12 cm;

step D: backfilling soil on the surface of the cushion layer, compacting and flattening by a road roller to form a transition layer with the thickness of 4+/-1 cm;

step E: paving an antifreezing asphalt pavement composition on the surface of the transition layer, compacting and flattening by a road roller to form a surface layer with the thickness of 8cm, wherein the antifreezing asphalt pavement composition is prepared in sequence according to examples 1-6.

The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.

Claims (5)

1. The antifreeze asphalt pavement composition is characterized by comprising the following raw materials in parts by weight: 80-100 parts of emulsified asphalt, 70-110 parts of coarse aggregate, 180-260 parts of fine aggregate, 10-18 parts of stearic acid modified calcium sulfate whisker, 10-15 parts of aluminum powder, 6-10 parts of expanding agent, 5-10 parts of silane coupling agent and 1-3 parts of N-ethyl-p-toluenesulfonamide;

the stearic acid modified calcium sulfate whisker comprises the following raw materials in parts by weight: 8-12 parts of stearic acid, 15-20 parts of calcium sulfate whisker and 100-120 parts of ethanol;

the emulsified asphalt comprises the following raw materials in parts by weight: 55-70 parts of asphalt, 1-3 parts of cationic emulsifier, 0.1-0.4 part of zwitterionic emulsifier, 2-4 parts of polyvinyl alcohol, 0.6-1 part of cellulose nanofiber, 5-8 parts of dimethyl sulfoxide, 0.01-0.05 part of thickener, 0.1-0.5 part of water reducer, 0.05-0.1 part of defoamer, 30-35 parts of water and 0.5-3 parts of alcohol;

the emulsified asphalt is prepared by the following method:

uniformly mixing 1/3 of the total amount of dimethyl sulfoxide and water, adding polyvinyl alcohol and cellulose nanofiber under stirring, continuously stirring for 20-30min, adding zwitterionic emulsifier under stirring, and stirring to uniformly mix to obtain a material I;

heating asphalt to 110-165 ℃ to obtain a material II;

adding a cationic emulsifier into the rest water to prepare soap solution, and heating to 45-50 ℃ to obtain a material III;

adding a water reducing agent and a defoaming agent into alcohol, stirring until the mixture is uniform, then adding a thickening agent under the stirring condition, and stirring until the mixture is uniform to obtain a material IV;

and respectively conveying the materials I, II, III and IV into a colloid mill, uniformly dispersing by the colloid mill to form an oil-in-water emulsion, and discharging the emulsion from the system when the temperature of the emulsion is reduced to 50-70 ℃ to obtain the emulsified asphalt.

2. An antifreeze asphalt pavement composition according to claim 1, wherein the zwitterionic emulsifier is one or more of disodium N-tallow- β -iminodipropionate, N-lauryl- β -aminopropionic acid, N-coco- β -aminopropionic acid.

3. An antifreeze asphalt pavement composition according to claim 1, wherein the alcohol is one or more of propanol, isopropanol and tert-butanol.

4. An antifreeze asphalt pavement composition according to claim 1, wherein the swelling agent is a calcium sulfoaluminate based swelling agent.

5. The pavement construction method is characterized by comprising the following steps of:

step A: digging a groove;

and (B) step (B): paving a layer of stone with the grain diameter of 35+/-1 cm at the bottom of the groove to form a base layer;

step C: paving broken stone with the grain diameter of 3+/-1 cm on the surface of the base layer to form a cushion layer with the thickness of 12-15 cm;

step D: backfilling soil on the surface of the cushion layer, compacting to form a transition layer with the thickness of 4+/-1 cm;

step E: paving the antifreeze asphalt pavement composition of any one of claims 1-4 on the surface of the transition layer, compacting, and forming a surface layer with the thickness of 7-10 cm.