CN113461366B - Asphalt concrete pavement and construction method - Google Patents

Abstract

The application relates to the field of asphalt concrete pavements, and particularly discloses an asphalt concrete pavement and a construction method. The asphalt concrete pavement is formed by paving an asphalt mixture, wherein the asphalt mixture comprises the following raw materials in parts by weight and modified aggregate: 660-780 parts of stone chips: 200-280 parts of active filler: 27-53 parts of asphalt: 40-50 parts of modified aggregate, wherein the modified aggregate is prepared from granite, thermosetting plastic and alkali lignin; the construction method comprises the following steps: the method comprises the following steps of S1, digging a groove; s2, trimming the groove; s3, paving a cushion layer; s4, paving an asphalt concrete pavement; and S5, compacting. The asphalt concrete pavement has the advantages that the water erosion resistance of the asphalt concrete pavement is improved, and the damage degree of the asphalt concrete pavement is reduced; in addition, the construction method has the advantages of simple process and stable structure of the obtained asphalt concrete pavement.

Description

Asphalt concrete pavement and construction method

Technical Field

The application relates to the field of asphalt concrete pavements, in particular to an asphalt concrete pavement and a construction method.

Background

The asphalt concrete pavement is a pavement using asphalt mixture as a surface layer, and asphalt and aggregate are manually mixed to form a mixture which can be used for pavement construction.

In the related technology, when the asphalt concrete pavement is constructed, the roadbed is cleaned firstly, then the cushion layer is laid, and after the cushion layer is laid, the asphalt concrete layer is laid to form the pavement layer.

In view of the above-mentioned related art, the inventors believe that when the asphalt concrete pavement is eroded by water, asphalt is peeled off from the aggregate, thereby causing damage to the asphalt concrete pavement and affecting normal running of the vehicle.

Disclosure of Invention

In order to improve the water erosion resistance of the asphalt concrete pavement and reduce the damage degree of the asphalt concrete pavement, thereby reducing the influence on the normal running of vehicles, the application provides the asphalt concrete pavement and the construction method.

In a first aspect, the present application provides an asphalt concrete pavement, which adopts the following technical scheme:

an asphalt concrete pavement is formed by paving an asphalt mixture, wherein the asphalt mixture comprises the following raw materials in parts by weight and modified aggregate: 660-780 parts of stone chips: 200-280 parts of active filler: 27-53 parts of asphalt: 40-50 parts of modified aggregate, wherein the modified aggregate is prepared from graded granite, thermosetting plastic and alkali lignin, and the weight ratio of the graded granite to the thermosetting plastic to the alkali lignin is 85-115: 10-20: 2-8, wherein the thermosetting plastic adheres alkali lignin to the surface of the graded granite.

By adopting the technical scheme, the thermosetting plastic forms a waterproof layer on the surface of the granite, the alkali lignin is adhered to the surface of the granite and is combined with the asphalt, the alkali lignin shows alkalinity and is combined with asphalt acid in the asphalt, the bonding strength between the modified aggregate and the asphalt is effectively improved, the alkali lignin promotes the crystallization of the thermosetting plastic so as to improve the strength of the granite, and further, the damage to the concrete pavement caused by the water entering the concrete pavement due to the fragmentation of the granite is reduced, so that the influence on the normal running of a vehicle is effectively reduced.

Preferably, the preparation method of the modified aggregate comprises the following steps:

s1, mixing and stirring the molten thermosetting plastic and the alkali lignin uniformly to obtain an adhesive;

s2, putting the graded granite into the adhesive prepared in the S1 for soaking, and then fishing out the graded granite from the adhesive and naturally cooling to room temperature to prepare the modified aggregate.

By adopting the technical scheme, the alkali lignin is adhered to the surface of the granite by melting the thermosetting plastic, and when the alkali lignin promotes the crystallization and solidification of the thermosetting plastic, the thermosetting plastic forms a stable waterproof layer on the surface of the granite, so that the water erosion resistance of the granite is effectively improved.

Preferably, the active filler comprises mineral powder and cement, and the weight ratio of the mineral powder to the cement is 20-40: 7-13.

By adopting the technical scheme, the workability of the asphalt mixture in the production process is improved by the mineral powder and the cement, and the aggregate gaps are filled, so that the gaps of the asphalt concrete pavement are effectively reduced, and the water permeating into the asphalt concrete pavement is reduced.

Preferably, the asphalt-aggregate ratio of the asphalt mixture is 4%.

By adopting the technical scheme, the asphalt-stone ratio is selected, so that the waterproof effect of the asphalt concrete pavement is improved, and the erosion damage of water to the asphalt concrete pavement is reduced.

Preferably, the asphalt mixture further comprises 3-9 parts of thermoplastic plastics, and the thermoplastic plastics are mixed with asphalt after being melted.

By adopting the technical scheme, the thermoplastic plastic improves the waterproof performance of the asphalt, and simultaneously improves the bonding strength between the asphalt and the modified aggregate, thereby effectively reducing water permeating into the asphalt concrete pavement and reducing the erosion damage of the asphalt concrete pavement by the water.

Preferably, the graded granite comprises three granites with the grain sizes of 9.5-16 mm, 4.75-9.5 mm and 2.36-4.75 mm respectively, and the weight ratio of the three granites is 23-27: 26-30: 17-21.

By adopting the technical scheme, the granite is graded, so that the compactness of the asphalt concrete pavement is improved, and the waterproof performance of the asphalt concrete pavement is improved.

Preferably, the asphalt mixture preparation method comprises the following steps:

s1, mixing the modified aggregate, the stone chips and the active filler, heating, stirring and mixing to prepare aggregate;

and S2, mixing the aggregate in the S1 with the asphalt, heating, stirring and mixing to obtain the asphalt mixture.

By adopting the technical scheme, the aggregate is preheated firstly, so that the moisture in the aggregate is reduced, and then the asphalt and the aggregate are mixed to prepare the asphalt mixture, so that the operation is simple.

In a second aspect, the application provides a construction method of an asphalt concrete pavement, which adopts the following technical scheme: a construction method of an asphalt concrete pavement comprises the following steps: s1, digging a groove; s2, trimming the groove; s3, paving a cushion layer; s4, paving an asphalt concrete pavement; and S5, compacting.

By adopting the technical scheme, the asphalt concrete pavement with a compact and stable structure is prepared, the waterproof performance of the concrete pavement is improved, the erosion damage of water to the asphalt concrete pavement is effectively reduced, and the influence on the normal running of a vehicle is reduced.

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

1. promote thermosetting type plastics through alkali lignin and form the waterproof layer on the granite surface in this application, thereby improve granite waterproof performance and improve asphalt concrete waterproof performance, simultaneously, alkali lignin improves the bonding strength between the granite pitch, further improves asphalt concrete waterproof performance, effectively reduces the erosion damage of water to asphalt concrete road surface.

2. In the application, gaps among the aggregates are filled by the mineral powder and the cement, so that the compactness of the concrete pavement is further improved.

3. The construction method provided by the application is used for compacting the asphalt concrete pavement, so that the compactness of the asphalt concrete is improved, and the waterproof performance of the asphalt concrete is improved.

Detailed Description

The granite has three particle sizes of 9.5-16 mm, 4.75-9.5 mm and 2.36-4.75 mm, and is purchased from Shandong Zhanfei building materials Co., Ltd;

the particle size of the stone chips is 0-2.36 mm, and the stone chips are purchased from Shandong Zhanfei building materials Co., Ltd;

the mineral powder is S95 grade blast furnace slag powder and is purchased from a processing plant for Hongshu Hongsheng mineral products;

the cement is superfine portland cement purchased from Shandong Otsu New Material science and technology Co., Ltd;

the thermosetting plastic is thermosetting phenolic resin purchased from chemical Limited company of Nanngting Rui;

the thermoplastic is polyformaldehyde, purchased from Shandong Huiyi An chemical Co., Ltd;

alkali lignin was purchased from bio-technology ltd, qingdatong, shandong;

the asphalt is No. 10 petroleum solid asphalt purchased from chemical industry Co., Ltd.

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

Preparation example

Preparation example 1

Weighing 23kg of granite with the thickness of 9.5-16 mm, 26kg of granite with the thickness of 4.75-9.5 mm and 17kg of granite with the thickness of 2.36-4.75 mm, stirring and mixing to obtain 1 part of graded granite.

Preparation example 2

Weighing 25kg of granite with the thickness of 9.5-16 mm, 28kg of granite with the thickness of 4.75-9.5 mm and 19kg of granite with the thickness of 2.36-4.75 mm, stirring and mixing to obtain 1 part of graded granite.

Preparation example 3

27kg of granite with the particle size of 9.5-16 mm, 30kg of granite with the particle size of 4.75-9.5 mm and 21kg of granite with the particle size of 2.36-4.75 mm are weighed, stirred and mixed to prepare 1 part of graded granite.

Preparation example 4

S1, melting 10kg of phenolic resin, adding 2kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 85kg of the graded granite prepared in the preparation example 1, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to obtain the modified aggregate.

Preparation example 5

S1, melting 10kg of phenolic resin, adding 2kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 85kg of the graded granite prepared in the preparation example 1, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to obtain the modified aggregate.

Preparation example 6

S1, melting 10kg of phenolic resin, adding 2kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 100kg of the graded granite prepared in the preparation example 2, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to obtain the modified aggregate.

Preparation example 7

S1, melting 10kg of phenolic resin, adding 2kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 115kg of the graded granite prepared in the preparation example 2, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to prepare the modified aggregate.

Preparation example 8

S1, melting 15kg of phenolic resin, adding 2kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 100kg of the graded granite prepared in the preparation example 2, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to obtain the modified aggregate.

Preparation example 9

S1, melting 20kg of phenolic resin, adding 2kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 100kg of the graded granite prepared in the preparation example 2, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to obtain the modified aggregate.

Preparation example 10

S1, melting 15kg of phenolic resin, adding 5kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 100kg of the graded granite prepared in the preparation example 2, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to obtain the modified aggregate.

Preparation example 11

S1, melting 15kg of phenolic resin, adding 8kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 100kg of the graded granite prepared in the preparation example 2, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to obtain the modified aggregate.

Preparation example 12

S1, melting 15kg of phenolic resin, adding 5kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 100kg of the graded granite prepared in the preparation example 3, immersing the graded granite in the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to obtain the modified aggregate.

Preparation example 13

S1, melting 20kg of phenolic resin, adding 8kg of alkali lignin, stirring and mixing uniformly to obtain an adhesive;

s2, weighing 115kg of the graded granite prepared in the preparation example 3, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to prepare the modified aggregate.

Preparation example 14

S1, melting 15kg of phenolic resin to prepare an adhesive;

s2, weighing 100kg of the graded granite prepared in the preparation example 2, immersing the graded granite into the adhesive prepared in the S1, fishing out the graded granite from the adhesive, dispersing and flatly paving the graded granite, and naturally cooling to room temperature to obtain the modified aggregate.

Preparation example 15

5kg of alkali lignin and 100kg of the graded granite prepared in preparation example 2 were weighed, stirred and mixed uniformly to obtain a modified aggregate.

TABLE 1 preparation examples 4-15 raw material tables

Examples

Example 1

S1, weighing 660kg of modified aggregate prepared in the preparation example 4, 200kg of stone chips, 20kg of mineral powder and 7kg of cement, mixing, heating and stirring for 1h at the heating temperature of 185 ℃ to prepare aggregate;

and S2, mixing the aggregate in the S1 and 40kg of asphalt, heating and stirring for 0.5h at the heating temperature of 180 ℃ to obtain the asphalt mixture.

Example 2

S1, weighing 660kg of modified aggregate prepared in the preparation example 4, 200kg of stone chips, 20kg of mineral powder and 7kg of cement, mixing, heating and stirring for 1h at the heating temperature of 185 ℃ to prepare aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 3kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 3

S1, weighing 660kg of modified aggregate prepared in the preparation example 4, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 45kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 4

S1, weighing 720kg of modified aggregate prepared in the preparation example 4, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 5

S1, weighing 720kg of modified aggregate prepared in the preparation example 4, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 45kg of asphalt and 3kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 6

S1, weighing 720kg of modified aggregate prepared in the preparation example 4, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 45kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 7

S1, weighing 720kg of modified aggregate prepared in the preparation example 4, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 45kg of asphalt and 9kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 8

S1, weighing 720kg of modified aggregate prepared in the preparation example 4, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 50kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 9

S1, weighing 780kg of modified aggregate prepared in preparation example 4, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 45kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 10

S1, weighing 720kg of modified aggregate prepared in preparation example 5, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 11

S1, weighing 720kg of modified aggregate prepared in preparation example 6, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 12

S1, weighing 720kg of modified aggregate prepared in preparation example 7, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 13

S1, weighing 720kg of modified aggregate prepared in the preparation example 8, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 14

S1, weighing 720kg of modified aggregate prepared in preparation example 9, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 15

S1, weighing 720kg of modified aggregate prepared in the preparation example 10, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 16

S1, weighing 720kg of modified aggregate prepared in preparation example 11, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 17

S1, weighing 720kg of modified aggregate prepared in preparation example 12, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 18

S1, weighing 720kg of modified aggregate prepared in preparation example 13, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 19

S1, weighing 780kg of modified aggregate prepared in preparation example 13, 280kg of stone chips, 40kg of mineral powder and 13kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 50kg of asphalt and 9kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Example 20

S1, weighing 780kg of modified aggregate prepared in preparation example 13, 280kg of stone chips, 40kg of mineral powder and 13kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing the aggregate in the S1 and 50kg of asphalt, heating and stirring for 0.5h at the heating temperature of 180 ℃ to obtain the asphalt mixture.

Example 21

A construction method of an asphalt concrete pavement comprises the following steps,

s1, digging a groove: cleaning sundries on the paved road section, and digging a groove on the ground;

s2, groove trimming: tamping the bottom of the groove, and placing curbs on two sides of the groove along the length direction of the road surface;

s3, paving a cushion layer: firstly, paving a steel slag cushion layer at the bottom of the groove, filling gaps of the steel slag cushion layer with cement mortar, and trowelling the upper surface of the cushion layer;

s4, paving the asphalt concrete pavement: paving an asphalt concrete pavement on the upper surface of the cushion layer by using an asphalt mixture;

s5, compacting: and carrying out initial pressing, re-pressing and final pressing on the road surface by using a road roller, and curing the concrete road surface after compacting for three times.

Comparative example

Comparative example 1

S1, weighing 720kg of modified aggregate prepared in preparation example 14, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Comparative example 2

S1, weighing 720kg of modified aggregate prepared in preparation example 15, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at 185 ℃, and preparing aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

Comparative example 3

S1, weighing 720kg of graded granite prepared in the preparation example 2, 240kg of stone chips, 30kg of mineral powder and 10kg of cement, mixing, heating and stirring for 1h at the heating temperature of 185 ℃ to prepare aggregate;

and S2, mixing, heating and stirring the aggregate in the S1, 40kg of asphalt and 6kg of polyformaldehyde for 0.5h, wherein the heating temperature is 180 ℃, and thus obtaining the asphalt mixture.

TABLE 2 raw material tables of examples 1 to 20 and preparation examples 1 to 3

Performance test according to JTG E20-2011 test procedure for road engineering asphalt and asphalt mixture T0709-2011 asphalt mixture, the asphalt mixtures prepared in examples 1-20 and comparative examples 1-3 are subjected to a Marshall stability test, and Marshall stability (kN) and immersion residual stability (%) are calculated, and specific detection data are shown in Table 3.

According to JTG E20-2011 road engineering asphalt and asphalt mixture test procedure T0729 plus 2000 asphalt mixture freeze-thaw splitting test, the asphalt mixtures prepared in examples 1-20 and comparative examples 1-3 are subjected to freeze-thaw splitting test, the freeze-thaw splitting strength ratio (%) is calculated, and the specific detection data are shown in Table 3.

The asphalt mixtures prepared in examples 1 to 20 and comparative examples 1 to 3 were subjected to the Kentunberg scattering test according to JTG E20-2011 road engineering asphalt and asphalt mixture test procedure T0733-.

Table 3 table of specific test performance data

It can be seen from the combination of example 15, comparative example 1, comparative example 2 and comparative example 3 and the combination of table 3 that the thermosetting plastic modifies granite to adhere alkali lignin to granite, so that the bonding strength of each raw material of the prepared asphalt mixture is increased, the water entering the asphalt concrete pavement is reduced to improve the water erosion resistance of the asphalt concrete pavement, and the damage degree of the asphalt concrete pavement is reduced; the reason is that the asphalt acid reacts with the alkali lignin to improve the bonding strength and compactness between the thermosetting plastic adhered to the granite surface and the asphalt through chemical bonding, and the alkali lignin can promote the crystallization of the thermosetting plastic, improve the waterproof performance of the thermosetting plastic layer on the granite surface, promote the crystallization of the thermoplastic plastic in the asphalt in the cooling process and further improve the waterproof performance of the asphalt mixture.

By combining the examples 4, 6 and 8 and combining the table 3, it can be seen that the bonding strength of the asphalt to each raw material is improved by selecting a proper asphalt-to-stone ratio, which is further beneficial to improving the compactness of the asphalt mixture, improving the waterproof performance of the asphalt mixture and effectively improving the anti-erosion capability of the asphalt concrete pavement to water.

By combining the examples 1, 2, 19 and 20 and the table 3, it can be seen that the properties of the asphalt mixture are improved by adding the thermoplastic, because the alkali lignin shows alkalinity to promote the crystallization of the thermoplastic and improve the waterproof property of the asphalt, and further improve the waterproof property of the asphalt concrete pavement and the anti-erosion capability of the asphalt concrete pavement to water.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (8)

1. An asphalt concrete pavement is characterized by being paved by an asphalt mixture, wherein the asphalt mixture comprises the following raw materials in parts by weight,

modifying aggregate: 660 to 780 parts by weight of a stabilizer,

stone chips: 200 to 280 parts of (A) a water-soluble polymer,

active filler: 27 to 53 parts by weight of a stabilizer,

asphalt: 40 to 50 parts of (A) a water-soluble polymer,

the modified aggregate is prepared from graded granite, thermosetting plastic and alkali lignin, wherein the weight ratio of the graded granite to the thermosetting plastic to the alkali lignin is 85-115: 10-20: 2-8, wherein the thermosetting plastic adheres alkali lignin to the surface of the graded granite.

2. An asphalt concrete pavement according to claim 1, wherein the preparation method of the modified aggregate comprises the following steps:

s1, mixing and stirring the molten thermosetting plastic and the alkali lignin uniformly to obtain an adhesive;

s2, putting the graded granite into the adhesive prepared in the S1 for soaking, and then fishing out the graded granite from the adhesive and naturally cooling to room temperature to prepare the modified aggregate.

3. An asphalt concrete pavement according to claim 1, wherein the active filler comprises mineral powder and cement, and the weight ratio of the mineral powder to the cement is 20-40: 7-13.

4. An asphalt concrete pavement according to claim 2 wherein the asphalt-to-stone ratio of the asphalt mixture is 4%.

5. The asphalt concrete pavement according to claim 1, wherein the asphalt mixture further comprises 3-9 parts of thermoplastic plastics, and the thermoplastic plastics are mixed with asphalt after being melted.

6. The asphalt concrete pavement of claim 1, wherein the graded granite comprises three granites with grain sizes of 9.5-16 mm, 4.75-9.5 mm and 2.36-4.75 mm, and the weight ratio of the three granites is 23-27: 26-30: 17-21.

7. An asphalt concrete pavement according to claim 1, wherein the preparation method of the asphalt mixture comprises the following steps:

s1, mixing the modified aggregate, the stone chips and the active filler, heating, stirring and mixing to prepare aggregate;

and S2, mixing the aggregate in the S1 with the asphalt, heating, stirring and mixing to obtain the asphalt mixture.

8. A method of constructing an asphalt pavement as claimed in any one of claims 1 to 7, comprising the steps of:

s1, digging a groove;

s2, trimming the groove;

s3, paving a cushion layer;

s4, paving an asphalt concrete pavement;

and S5, compacting.