CN110229532B

CN110229532B - Emulsified asphalt, emulsified asphalt mixture and cold-mixing cold-paving wearing layer prepared from mixture

Info

Publication number: CN110229532B
Application number: CN201910217073.9A
Authority: CN
Inventors: 王勇; 姚立峰
Original assignee: Shenyang Tancheng Road Bridge Technology Co ltd
Current assignee: Shenyang Tancheng Road Bridge Technology Co ltd
Priority date: 2019-03-21
Filing date: 2019-03-21
Publication date: 2022-02-01
Anticipated expiration: 2039-03-21
Also published as: CN110229532A

Abstract

The invention provides emulsified asphalt, an emulsified asphalt mixture and a cold-mixing cold-paving wearing layer prepared from the emulsified asphalt mixture. The raw materials of the emulsified asphalt comprise asphalt, water, an organic amine emulsifier and organic polyacid, wherein the organic amine emulsifier and the organic polyacid are combined with each other through the action of electrostatic attraction.

Description

Emulsified asphalt, emulsified asphalt mixture and cold-mixing cold-paving wearing layer prepared from mixture

Technical Field

The invention relates to the technical field of pavement maintenance, in particular to emulsified asphalt, an emulsified asphalt mixture and a cold-mixed cold-paving wearing layer prepared from the emulsified asphalt mixture.

Background

The maintenance of the asphalt pavement is vital to prolonging the service life of the pavement and reducing the national capital investment. The maintenance technology mainly based on the hot-mix asphalt mixture is restricted by a plurality of factors such as large energy consumption, high equipment investment cost, short finished product transportation distance and the like. For example, in the hot-mix ultra-thin wearing layer technology, the used hot-mix mixture is restricted by an asphalt mixture factory, the transportation distance is limited, and the problems of high energy consumption, large VOC emission, high cost and the like exist. Therefore, the cold mixing and cold paving technology is expected to become the best means for maintaining the asphalt pavement, which can minimize the capital and maximize the benefit.

The cold-mixing cold-paving asphalt concrete includes two forms of using polyurethane and other reactive polymer and diluted asphalt as main body and emulsified asphalt as main body. The cold-mix asphalt mixture mainly comprising polyurethane and diluted asphalt is not applied in large scale in the market due to high cost, large VOC emission and research, development and verification stage. The cold mixing and cold paving technology taking the emulsified asphalt as a main body has the advantages that when a large paving thickness is adopted, the curing and forming time of the asphalt mixture is long, and the cold mixing and cold paving technology cannot be applied to quick maintenance; and by adopting a micro-surfacing technology with the paving thickness of about 1cm, although the rapid maintenance can be realized, the problem of high noise in the vehicle in the driving process of the vehicle exists.

Disclosure of Invention

In view of the above, it is necessary to provide an emulsified asphalt, an emulsified asphalt mixture and a cold-mix cold-paving wearing layer prepared from the emulsified asphalt and the emulsified asphalt mixture, aiming at the problem of high noise of road maintenance and driving in micro-surfacing technology.

The invention provides emulsified asphalt, which comprises asphalt, water, an organic amine emulsifier and organic polyacid as raw materials, wherein the organic amine emulsifier and the organic polyacid are combined with each other through electrostatic attraction.

In one embodiment, the molar ratio of the amine group of the organic amine emulsifier to the carboxyl group of the organic polyacid is 1:1 to 1: 2.

In one embodiment, the organic amine emulsifier comprises one or more of a fatty amine, a fatty amine epoxide, a fatty imidazoline, a fatty quaternary ammonium salt, and a fatty piperazine.

In one embodiment, the organic amine emulsifier is an organic amine compound containing a tertiary amine group or a heterocycle.

In one embodiment, the organic polyacid comprises one or more of oxalic acid, terephthalic acid, maleic acid, tartaric acid, citric acid, and trimesic acid.

In one embodiment, the organic polyacid is a tri-organic carboxylic acid.

The invention also provides a preparation method of the emulsified asphalt, which comprises the following steps:

under the condition of 45-65 ℃, uniformly mixing and stirring the water, the organic amine emulsifier and the organic polybasic acid according to the proportion to prepare a soap solution;

and preparing the emulsified asphalt by the prepared soap solution and the heated asphalt through a colloid mill according to a proportion.

In one embodiment, the step of uniformly mixing and stirring the water, the organic amine emulsifier and the organic polyacid according to a proportion at 45-65 ℃ to prepare the soap solution has a stirring time of 0.5-1 hour.

The invention also provides an emulsified asphalt mixture, which comprises the discontinuous graded aggregate and the emulsified asphalt.

In one embodiment, the gap-graded aggregate comprises coarse aggregate and fine aggregate, the coarse aggregate has a particle size of 5mm to 10mm, and the fine aggregate has a particle size of 0mm to 3 mm.

In one embodiment, the coarse aggregate is 55 to 95 parts, the fine aggregate is 5 to 45 parts, and the emulsified asphalt is 10.5 to 12 parts by weight.

In one embodiment, the discontinuous graded aggregate is graded as: the passing rate of a 9.5mm square-hole sieve is 100%, the passing rate of a 4.75mm square-hole sieve is 35-60%, the passing rate of a 2.36mm square-hole sieve is 25-45%, the passing rate of a 1.18mm square-hole sieve is 17-30%, the passing rate of a 0.6mm square-hole sieve is 12-20%, the passing rate of a 0.3mm square-hole sieve is 10-18%, the passing rate of a 0.15mm square-hole sieve is 6-15%, and the passing rate of a 0.075mm square-hole sieve is 3-10%.

The invention also provides a cold-mixing cold-paving wearing layer prepared from the emulsified asphalt mixture, wherein the thickness of the wearing layer is 1-2 cm.

The paving thickness of the existing micro-surfacing rapid pavement restoration technology adopts dense asphalt mixture, the paving thickness is only slightly larger than the maximum nominal grain size stone, the large grain size stone protrudes above a pavement base line after pavement is paved, and the stone can not return to the pavement base line through rolling by a road roller or long-term vehicle driving, so that driving noise is caused. Although the maximum nominal grain size of the stone is reduced, the noise is slightly reduced, the support of coarse aggregate is lacked in the pavement structure, the strength is further reduced, the pavement structure depth is reduced, the friction coefficient is reduced, the driving safety is affected, and meanwhile, the noise caused by the air explosion phenomenon in the tire driving process is generated. It is therefore desirable to use open or gap grading types in hot mixes. However, the traditional emulsified asphalt can not form a thick asphalt film, the bonding strength between stone materials and stone materials is low, and the stone materials fall off in a large area after the traffic is opened due to the change of the gradation of the mixture. According to the emulsified asphalt provided by the embodiment of the invention, the raw materials contain the organic amine emulsifier and the organic polyacid, the weak ionization of the organic polyacid causes the electrostatic attraction effect between the organic amine emulsifier and the organic polyacid, the organic polyacid and the asphalt particles with the surfaces being rich in the organic amine emulsifier are combined to form a space net-shaped structure under the electrostatic attraction effect, the pseudoplasticity of the emulsified asphalt mortar is greatly improved, the flowing of the emulsified asphalt mortar is delayed or avoided, a thicker asphalt film can be formed between stone materials and the stone materials, the cross-section distribution design with the paving thickness being 1.5-2 times larger than the maximum nominal particle size is ensured, the stone materials are not protruded above a base line of a road surface after being compacted, and the in-car noise of a vehicle in the driving process is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a cold-mix cold-paving wearing layer according to an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below by way of embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the invention provides emulsified asphalt, which comprises asphalt, water, an organic amine emulsifier and organic polyacid as raw materials, wherein the organic amine emulsifier and the organic polyacid are combined with each other through electrostatic attraction.

According to the emulsified asphalt provided by the embodiment of the invention, the organic amine emulsifier is selected, the organic polyacid is added into the organic amine emulsifier, the organic amine emulsifier and the organic polyacid can be combined mutually through the action of electrostatic attraction, under the action of the electrostatic attraction, the organic polyacid plays a role in crosslinking and is combined with the asphalt particles with the surface enriched with the organic amine emulsifier, so that the emulsified asphalt particles form a spatial network structure for arrangement, the pseudoplasticity of the emulsified asphalt mortar is greatly improved, the flowing of the emulsified asphalt mortar is delayed or avoided, a thicker asphalt film is further ensured to be formed between stone and stone, the cross-grading design that the paving thickness is 1.5-2 times larger than the maximum nominal particle size is adopted, the stone is not protruded above a base line of a road surface after being compacted, and the in-car noise of a vehicle in the driving process is reduced.

The asphalt can be selected from petroleum asphalt with a penetration degree of 60-120, such as heavy traffic No. 70 asphalt and heavy traffic No. 90 asphalt. The water may be tap water.

In one embodiment, the organic amine-based emulsifier comprises one or more of a fatty amine, a fatty amine epoxide, a fatty imidazoline, a fatty quaternary ammonium salt, and a fatty piperazine. The number of carbon atoms in the organic amine emulsifier is preferably 16-20. Preferably, the organic amine emulsifier is an organic amine compound containing a tertiary amine group or a heterocycle. The tertiary amine group or the heterocyclic ring is more favorable for the electrostatic attraction effect.

In one embodiment, the organic polyacid comprises one or more of oxalic acid, terephthalic acid, maleic acid, tartaric acid, citric acid, trimesic acid. Preferably, the organic polyacid is a tri-organic carboxylic acid. They ensure the ionization activation of the emulsifier and simultaneously ensure a space network structure due to a multi-carboxyl mechanism.

The organic polybasic acid can activate the organic polyamine at a higher temperature (50-70 ℃) and can keep a better electrostatic attraction effect at a lower use temperature (5-40 ℃), preferably, the emulsified asphalt in the embodiment of the application is emulsified at a temperature of 45-65 ℃, and the organic polybasic acid can keep a better electrostatic attraction effect on the organic polyamine and the organic polyamine simultaneously, so that the pseudoplasticity of the emulsified asphalt is improved, and the emulsified asphalt can be mixed with a graded stone material to achieve the purpose of reducing noise.

Preferably, the molar ratio of the amine group of the organic amine emulsifier to the carboxyl group of the organic polyacid is 1: 1-1: 2.

In one embodiment, the emulsified asphalt further comprises an asphalt modifier, a first asphalt modifier or a second asphalt modifier, wherein the first asphalt modifier is one or more of styrene-butadiene rubber, ethylene-vinyl acetate polymer, styrene-butadiene-styrene block copolymer and polyethylene, and the second asphalt modifier is one or more of styrene-butadiene latex, acrylic emulsion, chloroprene emulsion and styrene-acrylic emulsion. Before the first asphalt modifier is used for emulsification, the matrix asphalt is modified to prepare modified asphalt, and then the modified asphalt modifier is emulsified. The second asphalt modifier is milky in nature during the soap lye preparation process or after emulsification.

In one embodiment, the emulsified asphalt further comprises additives, wherein the additives are a softening agent, a reinforcing agent and a stabilizing agent. The softener is one or more of rubber oil, extract oil and aromatic oil; the reinforcing agent is one or more of rosin resin and modified derivatives thereof, hydrocarbon resin, phenolic resin and alkyd resin; the stabilizer is one or more of sulfur or other crosslinking agents. The softener and the reinforcing agent can be added simultaneously or only one of the softeners and the reinforcing agent, so that the modified asphalt is more favorably emulsified, the low-temperature ductility of the asphalt is improved, or the mechanical property of the asphalt is improved.

s10, mixing and stirring the water, the organic amine emulsifier and the organic polybasic acid uniformly according to a proportion to prepare a soap solution at the temperature of 45-65 ℃;

s20, preparing emulsified asphalt by the soap solution prepared in the step S10 and the heated asphalt through a colloid mill according to the proportion.

The organic amine emulsifier can be one or more selected from fatty amine, fatty amine epoxide, fatty imidazoline, fatty quaternary ammonium salt and fatty piperazine emulsifier, and the organic polyacid can be one or more selected from oxalic acid, terephthalic acid, maleic acid, tartaric acid, citric acid and trimesic acid.

In the step S10, the soap solution is prepared under the temperature condition of 45-65 ℃. In one embodiment, the temperature in step S10 may preferably be 55 ℃ to 65 ℃; in another embodiment, the temperature in step S10 may preferably be 45 to 55 ℃.

In one embodiment, in step S10, the stirring time is 0.5 hours to 1 hour.

In one embodiment, in step S20, the temperature of the heated asphalt is 130 ℃ to 200 ℃.

The asphalt can be base asphalt or modified asphalt.

In an embodiment, the asphalt is modified asphalt, and the step S10 is preceded by a step S00 of adding the first asphalt modifier to the asphalt to obtain the modified asphalt. In one embodiment, the first asphalt modifier is selected from one or more of styrene-butadiene rubber, EVA, SBS and PE. The step S00 further includes adding one or more of a softener, a reinforcing agent, and a stabilizer to the modified asphalt.

In another embodiment, the asphalt is heavy-duty asphalt, a second asphalt modifier may be added in S10 or step S30 may be further included after step S20, and the second asphalt modifier is added to the emulsified asphalt and stirred uniformly. In another embodiment, the second asphalt modifier is selected from one or more of a styrene-butadiene emulsion, an acrylic emulsion, a neoprene emulsion, and a styrene-acrylic emulsion.

According to the preparation method of the emulsified asphalt provided by the embodiment of the invention, the organic amine emulsifier is activated at 45-70 ℃ to produce the emulsified asphalt, and under the condition of 5-40 ℃, the organic polybasic acid and the organic amine emulsifier enriched on the surface of asphalt particles generate electrostatic attraction to form a spatial network structure. The emulsified asphalt particles can be dispersed in the emulsion more stably without sedimentation caused by the difference of gravity.

The mortar formed by mixing it with fine aggregate has better pseudoplasticity and is more stably enriched on the surface of stone material without flowing before the emulsified asphalt is demulsified.

The invention also provides an emulsified asphalt mixture, which comprises the graded aggregate and the emulsified asphalt.

The graded aggregate comprises coarse aggregate and fine aggregate, wherein the grain size of the coarse aggregate is 5-10 mm, and the grain size of the fine aggregate is 0-5 mm. Wherein the fine aggregate comprises machine-made sand, mineral powder, and the like.

In one implementation, the coarse aggregate is 55 to 95 parts, the fine aggregate is 5 to 45 parts, and the emulsified asphalt is 10.5 to 12 parts by weight.

In one embodiment, the discontinuous graded aggregate is graded as: the passing rate of a 9.5mm square-hole sieve is 100%, the passing rate of a 4.75mm square-hole sieve is 35-100%, the passing rate of a 2.36mm square-hole sieve is 25-45%, the passing rate of a 1.18mm square-hole sieve is 17-30%, the passing rate of a 0.6mm square-hole sieve is 12-20%, the passing rate of a 0.3mm square-hole sieve is 10-18%, the passing rate of a 0.15mm square-hole sieve is 6-15%, and the passing rate of a 0.075mm square-hole sieve is 3-10%.

In one embodiment, the emulsified asphalt mixture further comprises one or more of mineral fines, fibers, and cement.

The emulsified asphalt mixture is an asphalt mastic type mixture, and the emulsified asphalt mixture can improve the thickness of a pavement and the construction depth of the pavement and improve the driving safety.

The invention also provides application of the emulsified asphalt mixture in preparing a cold-mixing cold-paving wearing layer.

The invention further provides a cold-mixing and cold-paving wearing layer prepared from the emulsified asphalt mixture, wherein the thickness of the wearing layer is 1.0-2.0 cm.

The preparation method of the cold-mixed cold-paved wearing layer comprises the following steps:

s100, mixing the aggregate and the emulsified asphalt in the emulsified asphalt mixture by adopting a slurry seal vehicle;

s200, the mixed emulsified asphalt mixture is put into an ultra-thin paving device for pavement paving, and the mixture is compacted after initial setting to obtain the cold-mixed cold-paved wearing layer.

The initial setting time is 10-60 minutes.

And in the compaction step, a steel wheel road roller with 3-10 tons can be used for compaction.

In order to ensure the bonding strength of the thin-layer fault-grading agent and the original pavement, when the emulsified asphalt mixture is paved by the ultrathin paving equipment, a layer of emulsified asphalt is synchronously sprayed on the original pavement. Preferably, the emulsified asphalt is sprayed in an amount of 0.2 kg/m to 0.4 kg/m.

The cold-mixed cold-paved wearing layer provided by the embodiment of the invention can be leveled with a base line of a road surface after being compacted, so that the driving noise is reduced, and the bonding force with the original road surface is up to 1.0 Mpa.

Example 1

S00, heating 1000 parts of heavy traffic No. 70 asphalt to 180-190 ℃, adding 50 parts of SBS into the asphalt, grinding by a colloid mill, keeping the temperature of the mixture at 180-190 ℃ for 4-5 hours, reducing the temperature to 170-180 ℃, adding 1 part of sulfur, and keeping the temperature for 1-2 hours to obtain modified asphalt;

s10, heating 600 parts of water to 55-65 ℃, adding 50 parts of organic amine emulsifier (oil diamine ethoxylate, CAS number: 68442-23-9) and 50 parts of citric acid into the water, and uniformly stirring to prepare a soap solution;

s20, pumping the soap solution prepared in the step S10 and the modified asphalt prepared in the step S00 into a colloid mill, and adjusting the parameters of the colloid mill to prepare emulsified asphalt.

And (3) carrying out performance test on the prepared emulsified asphalt, and determining various indexes of the asphalt emulsion according to an asphalt emulsion national standard determination method: the emulsified asphalt is cationic, the storage stability for 1 day and 5 days is 0.1% and 0.9%, the content of evaporation residue is 61.5%, the mixing time with aggregate is 210s, and the initial setting time is 11 min.

Comparative example 1

The procedure of example 1 was repeated, except that 50 parts of an organic amine emulsifier (maleic acid-modified tall oil acid-polyethylene polyamine reaction amide, CAS No.: was added) and the pH was adjusted to 2.2 with hydrochloric acid in step S10. And (3) carrying out performance test on the prepared emulsified asphalt: the emulsified asphalt was cationic, the storage stability for 1 day and 5 days was 2.7% and 5.4%, respectively, the evaporation residue content was 62.7%, the emulsified asphalt in comparative example 1 could not be mixed with the aggregate in example 1, and the mixing time with the densely-mixed aggregate was 130s, and the initial setting time was 8 min.

TABLE 1 main technical indexes of emulsified asphalt

Example 2

S10, heating 600 parts of water to 45-55 ℃, adding 50 parts of organic amine emulsifier (oil diamine ethoxylate, CAS number: 68442-23-9) and 75 parts of oxalic acid into the water, uniformly stirring, adding 100 parts of butylbenzene emulsion, and further stirring to complete the preparation of soap solution;

s20, pumping the soap solution prepared in the step S10 and 1000 parts of heavy traffic No. 70 asphalt heated to 140 ℃ into a colloid mill, and adjusting parameters of the colloid mill to prepare emulsified asphalt.

And (3) carrying out performance test on the prepared emulsified asphalt: the emulsified asphalt is cationic, the storage stability for 1 day and 5 days is 0.1% and 2.0%, the evaporation residue content is 60.3%, the mixing time with aggregate is 150s, and the initial setting time is 8 min.

Example 3

S10, heating 600 parts of water to 45-55 ℃, adding 50 parts of organic amine emulsifier (oil diamine ethoxylate, CAS number: 68442-23-9) and 100 parts of phthalic acid into the water, and uniformly stirring to prepare a soap solution;

and S20, sequentially pumping the soap solution prepared in the step S10 and 1000 parts of heavy traffic No. 70 asphalt heated to 140 ℃ into a colloid mill, and adjusting parameters of the colloid mill to prepare emulsified asphalt.

S30, adding 100 parts of cationic styrene-butadiene rubber emulsion into the emulsified asphalt prepared in the step S20, and uniformly stirring to modify.

And (3) carrying out performance test on the prepared emulsified asphalt: the emulsified asphalt is cationic, the storage stability for 1 day and 5 days is 0.5 percent and 2.8 percent respectively, the content of evaporation residue is 60.9 percent, the mixing time with aggregate is 210s, and the initial setting time is 14 min.

Test example

S100, preparing aggregates according to stone gradation shown in the table 2, wherein the coarse aggregates are basalt macadam, the fine aggregates are mineral powder, and then the aggregates and the emulsified asphalt prepared in the example 1 are mixed by a slurry seal car to obtain an emulsified asphalt mixture;

s200, the mixed emulsified asphalt mixture is thrown into an ultra-thin paving device to be paved on a road surface, after 40 minutes, a steel wheel roller of 8 tons is used for compacting, and a corresponding cold-mixed cold-paving wearing layer is prepared, wherein the structural schematic diagram of the cold-mixed cold-paving wearing layer is shown in figure 1, and stone with large particle size is below or level to a road surface base line.

TABLE 2 Graded aggregates

Comparative example 2

S100, preparing aggregates according to stone gradation shown in the table 3, wherein the coarse aggregates are basalt macadam, the fine aggregates are machine-made sand, and then mixing the aggregates and the emulsified asphalt prepared in the comparative example 1 by using a slurry seal car to obtain an emulsified asphalt mixture and directly paving the emulsified asphalt mixture by using the equipment with a paving box; and compacting by using an 8-ton steel-wheel road roller after 40 minutes to prepare the corresponding traditional road surface.

TABLE 3 dense proportioning of aggregates

Aggregate particle size (mm)	Passage Rate (%)
		9.50	100.0
4.75	82.3
		2.36	61.3
1.18	37.7
		0.60	25.1
0.30	17.1
		0.150	12.0
0.075	8.7

When the vehicle runs on the cold-mixed cold-paved wearing layer and the traditional road at the speed of 80km/h, the noise tester is used for noise test, and the results are shown in table 4:

TABLE 4

	Noise (F)
		Cold mix cold spreading wearing layer	76
Traditional road surface	82

Measuring the binding power of the cold-mixed cold-paved wearing layer and the original pavement by using a drawing tester (LHLS-0985 type), randomly selecting test points, drilling a ring groove at each test point, wherein the depth of the ring groove reaches the depth of 10mm below the surface of the original pavement, binding the drawing tester and the cold-mixed cold-paved wearing layer by using a binding agent, then carrying out drawing test, measuring 5 points at each position, wherein the distance between every two test points is not less than 100mm, the total distance is within 2m, and the test results are shown in a table 5:

TABLE 5

	Adhesion to the original road surface
		Cold mix cold spreading wearing layer	1.03Mpa

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The cold-mixing and cold-paving wearing layer is characterized in that an asphalt mixture for preparing the cold-mixing and cold-paving wearing layer comprises discontinuous-graded aggregate and emulsified asphalt, the emulsified asphalt raw material comprises asphalt, an asphalt modifier, water, an organic amine emulsifier and organic polyacid, the organic amine emulsifier and the organic polyacid are mutually combined through electrostatic attraction, the asphalt is No. 70 re-cross asphalt, the asphalt modifier is SBS, the organic amine emulsifier is an oil diamine ethoxylate with CAS number 68442-23-9, and the organic polyacid is citric acid.

2. The cold mix cold paving wearing layer according to claim 1, wherein the molar ratio of the amine group of the organic amine emulsifier to the carboxyl group of the organic polyacid is 1:1 to 1: 2.

3. The cold mix cold wear layer of claim 1, wherein the emulsified asphalt is prepared by a method comprising the steps of:

adding an asphalt modifier into asphalt to obtain modified asphalt;

under the condition of 45-65 ℃, uniformly mixing and stirring the water, the organic amine emulsifier and the organic polybasic acid according to a proportion to prepare a soap solution;

and preparing the emulsified asphalt by the prepared soap solution and the heated modified asphalt through a colloid mill according to a proportion.

4. The cold-mix cold-paving wearing layer according to claim 3, wherein the stirring time in the step of uniformly mixing and stirring the water, the organic amine emulsifier and the organic polyacid in proportion to prepare the soap solution at 45-65 ℃ is 0.5-1 hour.

5. The cold mix cold paving wearing layer as claimed in claim 1, wherein the gap graded aggregate comprises coarse aggregate and fine aggregate, the coarse aggregate having a particle size of 5mm to 10mm, and the fine aggregate having a particle size of 0mm to 3 mm.

6. The cold mix cold paving wearing layer according to claim 5, wherein the coarse aggregate is 55 to 95 parts, the fine aggregate is 5 to 45 parts, and the emulsified asphalt is 10.5 to 12 parts by weight.

7. A cold mix cold wear layer according to claim 5, wherein the gap graded aggregate is graded as: the square-hole sieve with the thickness of 9.5mm is 100%, the square-hole sieve with the thickness of 4.75mm is 35% -60%, the square-hole sieve with the thickness of 2.36mm is 25% -45%, the square-hole sieve with the thickness of 1.18mm is 17% -30%, the square-hole sieve with the thickness of 0.6mm is 12% -20%, the square-hole sieve with the thickness of 0.3mm is 10% -18%, the square-hole sieve with the thickness of 0.15mm is 6% -15%, and the square-hole sieve with the thickness of 0.075mm is 3% -10%.

8. The cold mix cold paving wearing layer according to any one of claims 1 to 7, wherein the wearing layer has a thickness of 1cm to 2 cm.