CN113582585A

CN113582585A - Compression-resistant asphalt pavement mixture, preparation method thereof and pavement construction method

Info

Publication number: CN113582585A
Application number: CN202110561977.0A
Authority: CN
Inventors: 马冰杰; 刘夏颖; 陈伟炳; 巩怡君
Original assignee: Zhejiang Zhonghuan Construction Co ltd
Current assignee: Zhejiang Zhonghuan Construction Co ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-11-02

Abstract

The application relates to the field of asphalt preparation, and particularly discloses a compression-resistant asphalt pavement mixture, a preparation method thereof and a pavement construction method. The asphalt pavement mixture comprises petroleum asphalt, aggregates, fillers, polypropylene fibers, terpene-phenol resin and inorganic salt; the preparation method comprises the following steps: preheating terpene-phenol resin, respectively adding polypropylene fiber and inorganic salt into the terpene-phenol resin, stirring to obtain a first mixture, then mixing aggregate and filler, preheating, adding into the first mixture to obtain a second mixture, and finally adding preheated petroleum asphalt into the second mixture to obtain an asphalt mixture; the construction method of the pavement comprises the following steps: the method comprises the steps of cleaning a base layer pavement, paving and rolling a first layer of asphalt, paving and rolling a second layer of asphalt, and finally spraying water to maintain the compacted asphalt pavement. The asphalt mixture has the effect of enhancing the cracking resistance of the pavement of the asphalt mixture.

Description

Compression-resistant asphalt pavement mixture, preparation method thereof and pavement construction method

Technical Field

The application relates to the field of asphalt preparation, in particular to a compression-resistant asphalt pavement mixture, a preparation method thereof and a pavement construction method.

Background

The asphalt is a black-brown complex mixture composed of hydrocarbons with different molecular weights and nonmetal derivatives thereof, is one of high-viscosity organic liquids, mostly exists in a liquid or semisolid petroleum form, and is mainly applied to the industries of coatings, plastics, rubbers and the like, pavements and the like.

With the rapid development of national economy, urban road construction is developed on a large scale, and the demand for asphalt is gradually increased. At present, in order to improve the mechanical property of asphalt, people often mix asphalt with mineral materials according to a certain proportion to form an asphalt mixture so as to lay road surfaces with different structures. Because the mechanical property of the asphalt mixture is low, the pavement paved with the asphalt mixture is easy to crack after being rolled for a long time by an automobile, and the driving safety is influenced.

Disclosure of Invention

In order to effectively enhance the cracking resistance of the pavement of the asphalt mixture, the application provides the compression-resistant asphalt pavement mixture, the preparation method of the compression-resistant asphalt pavement mixture and the construction method of the pavement.

In a first aspect, the application provides a compression-resistant bituminous pavement mixture, which adopts the following technical scheme: the compression-resistant asphalt pavement mixture comprises the following raw materials in parts by weight:

petroleum asphalt: 10-15 parts;

aggregate: 100-300 parts;

filling: 5-15 parts;

polypropylene fiber: 1.25-3.5 parts;

terpene phenol resin: 5-26 parts;

inorganic salts: 6 to 33 portions.

By adopting the technical scheme, the polypropylene fiber, the terpene-phenol fiber and the inorganic salt are matched with each other, so that the mechanical strength of the asphalt mixture is effectively enhanced, the aim of enhancing the overall crack resistance of the asphalt mixture is fulfilled, and the asphalt mixture has great economic value.

Regarding the phenomenon of strengthening the crack resistance of the asphalt mixture, the inventor guesses that the polypropylene fiber has stronger toughness and strength, and can be quickly bonded with the asphalt mixture by forming a gel layer after being added, so that the bonding speed between asphalt and aggregate is improved, and the cohesion of the asphalt mixture is effectively enhanced; the terpene-phenol resin can firstly form a network structure of cross-linking spaces and then be refilled into the pores of the asphalt mixture so as to improve the hydrophobicity of the asphalt and improve the bonding strength between the asphalt and the aggregate; in addition, the terpene-phenol resin and the polypropylene fiber generate a synergistic effect, and a formed network structure of a crosslinking space can generate a bonding effect between a gel layer formed by the asphalt and the polypropylene fiber, so that the low-temperature sensitivity of the asphalt mixture can be reduced; cations in the inorganic salt exist in a free form, so that the cation concentration in the system can be effectively improved, and the water absorption and the apparent density of the aggregate are reduced; in addition, the inorganic salt can generate a synergistic effect with the terpene-phenol resin, the terpene-phenol resin can adsorb free cations, and a protective layer is formed on the surface of the terpene-phenol resin by combining the cations in the inorganic salt and the polar anions in the terpene-phenol resin, so that the integrity of a cross-linked network structure of the terpene-phenol resin is effectively improved, the binding force of the asphalt mixture and the terpene-phenol resin is further enhanced, and the overall crack resistance of the asphalt mixture is enhanced.

Preferably, the aggregate comprises coarse aggregate and fine aggregate, the grain size specification of the coarse aggregate comprises 5-10mm limestone and 10-15mm diabase, the fine aggregate is 0-2mm basalt, and the weight ratio of the limestone, the diabase and the basalt is 2:1: 1.

By adopting the technical scheme, the limestone has better compression resistance and corrosion resistance, and the diabase and the basalt both have better wear resistance and corrosion resistance, so that the overall mechanical property of the asphalt mixture can be effectively enhanced by utilizing the characteristics of the limestone, the diabase and the basalt.

Preferably, the inorganic salt is one or more of sodium chloride, calcium chloride and magnesium chloride.

By adopting the technical scheme, free cations in sodium chloride, calcium chloride and magnesium chloride can be combined with polar anions in the terpene-phenol resin, so that a cross-linked network structure formed by the terpene-phenol resin can be effectively strengthened, and the bonding strength between the terpene-phenol resin and asphalt can be enhanced.

Preferably, the inorganic salt is calcium chloride, the terpene-phenol resin is 5-22 parts by weight, the calcium chloride is 7.5-33 parts by weight, and the weight ratio of the terpene-phenol resin to the calcium chloride is 1: 1.5.

By adopting the technical scheme, the calcium chloride is selected as the inorganic salt to be added into the asphalt mixture, free calcium ions can be combined with polar anions of the terpene-phenol resin, a calcium ion protective layer is quickly formed, meanwhile, the calcium ions which cannot be combined with the terpene-phenol resin can effectively improve the calcium ion concentration in a system, so that the water absorption rate and the apparent density of the aggregate can be effectively reduced, in addition, the cracking resistance of the asphalt concrete can be improved by controlling the weight ratio of the terpene-phenol resin to the calcium chloride in the asphalt concrete to be 1:1.5, and the integral mechanical property of the asphalt mixture is further enhanced.

Preferably, the weight ratio of the polypropylene fiber to the terpene-phenol resin is 1 (5-8).

By adopting the technical scheme, the weight ratio of the polypropylene fiber to the terpene phenol resin is controlled to be 1: (5-8), the synergistic effect between the two can be further enhanced, and the overall temperature sensitivity of the asphalt mixture can be effectively improved.

Preferably, the compression-resistant asphalt pavement mixture further comprises 7-12 parts of amino silicone oil by weight.

By adopting the technical scheme, the amino silicone oil is added into the asphalt mixture, and the speed of forming the gel layer by the polypropylene fiber is accelerated through the synergistic effect between the amino silicone oil and the polypropylene fiber, so that the bonding property of the polypropylene fiber is further improved, and the integral compression resistance and crack resistance of the asphalt mixture can be favorably enhanced.

Preferably, the weight ratio of the polypropylene fiber to the amino silicone oil is 1 (4-5).

By adopting the technical scheme, the weight ratio of the polypropylene fiber to the amino silicone oil is controlled to be 1 (4-5), so that the amino silicone oil and the polypropylene fiber can be further accelerated to be combined, the softening efficiency of the polypropylene fiber is improved, the speed of forming a gel layer by the polypropylene fiber can be effectively accelerated, the bonding rate of the polypropylene fiber and the asphalt mixture is further improved, and the anti-cracking performance is improved.

In a second aspect, the application provides a preparation method of a compression-resistant asphalt pavement mixture, which adopts the following technical scheme:

the preparation method of the compression-resistant asphalt pavement mixture comprises the following steps:

the method comprises the following steps: weighing terpene-phenol resin according to a set proportion, and heating the terpene-phenol resin to 80-148 ℃;

step two: weighing polypropylene fibers and inorganic salt according to a set proportion, adding the polypropylene fibers and the inorganic salt into the preheated terpene-phenol resin, stirring for 10-15 s, and uniformly mixing to obtain a first mixture;

step three: weighing aggregate and filler according to a set proportion, mixing the aggregate and the filler, then heating to 180-190 ℃, adding the heated aggregate and the heated filler into the first mixture together, stirring for 12-15 s, and uniformly mixing to obtain a second mixture;

step four: weighing the petroleum asphalt according to a set proportion, heating the petroleum asphalt to 175-185 ℃, adding the heated petroleum asphalt into the second mixture in the third step, stirring for 75-85 s under heat preservation, and discharging to obtain an asphalt mixture.

By adopting the technical scheme, firstly, the terpene-phenol resin is heated to a molten state in the step one, then the polypropylene fiber and the inorganic salt are added into the terpene-phenol resin in the molten state, so that the inorganic salt can be combined with the terpene-phenol resin into a cross-linked net-shaped structure in advance, then the aggregate and the filler are heated simultaneously so as to be mixed with the petroleum asphalt, finally, the petroleum asphalt is heated to a temperature suitable for mixing through the step four, then the petroleum asphalt is added into the second mixture obtained in the step three to be mixed, and finally, the required asphalt mixture is obtained after discharging.

Preferably, in the fourth step, 7 to 10 parts by weight of the amino silicone oil is added together when the petroleum asphalt is added to the second mixture.

By adopting the technical scheme, after the amino silicone oil is added, the polypropylene fiber can be quickly combined with the polypropylene fiber, and simultaneously the polypropylene fiber is softened, so that the speed of forming a gel layer by the polypropylene fiber can be effectively accelerated, the bonding rate of the polypropylene fiber and the asphalt mixture is further improved, the overall elasticity of the asphalt mixture is further enhanced, and the purpose of enhancing the cracking resistance of the asphalt mixture is achieved.

In a third aspect, the application provides a pavement construction method of a compression-resistant asphalt pavement mixture, which adopts the following technical scheme:

a pavement construction method of a compression-resistant asphalt pavement mixture comprises the following steps:

the method comprises the following steps: cleaning the original pavement structure to expose most of the pavement base layer structure and keep the pavement base layer structure dry;

step two: spreading the prepared asphalt mixture on a pavement base, maintaining the temperature at 130-170 ℃, and properly repairing or sweeping when the local part has short materials or excessive asphalt mixture to form a first layer of asphalt;

step three: rolling the first layer of asphalt, pressing the first layer of asphalt from the curb at one side into the road, and rolling for 3-4 times;

step four: continuously paving an asphalt mixture on the first layer of asphalt, and maintaining the temperature at 100-140 ℃ to form a second layer of asphalt;

step five: repeating the third step to roll and compact the second layer of asphalt;

step six: and (5) performing water spraying maintenance on the compacted pavement, wherein the maintenance time lasts for 1-3 days.

By adopting the technical scheme, impurities of the original pavement are removed through the first step, then the impurities are uniformly paved, so that the prefabricated asphalt mixture is paved on a base layer under the constant temperature condition to form the initial first layer of asphalt, the first layer of asphalt is rolled for multiple times in time, then the prefabricated asphalt mixture is paved on the first layer of asphalt under the constant temperature condition to form the second layer of asphalt, the second layer of asphalt is rolled for multiple times in time, and finally the compacted asphalt pavement is subjected to multi-day water spraying maintenance to achieve the purposes of quickly cooling and cleaning the asphalt pavement.

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

1. the polypropylene fiber, the terpene-phenol fiber and the inorganic salt are matched with each other, so that the mechanical strength of the asphalt mixture is effectively enhanced, the aim of enhancing the overall crack resistance of the asphalt mixture is fulfilled, and the asphalt mixture has great economic value;

2. through adding amino silicone oil in bituminous mixture, can be through the synergistic effect between amino silicone oil and the polypropylene fiber, come further improvement polypropylene fiber's adhesion properties, thereby can be favorable to strengthening the holistic compressive property of bituminous mixture, in addition, through being 1 (4-5) with polypropylene fiber and amino silicone oil's quality ratio control, amino silicone oil and polypropylene fiber can be further accelerated to combine, in order to improve the efficiency that polypropylene fiber softens, thereby can effectually accelerate the speed that polypropylene fiber forms the gel bed, further promotion polypropylene fiber and bituminous mixture's bonding rate.

Drawings

Fig. 1 is a schematic flow chart of a preparation method of the compression-resistant asphalt pavement mixture in the application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples.

TABLE 1 sources and types of raw materials

Name of raw materials	Model number	Manufacturer of the product
			Petroleum asphalt	70A grade	May Min Hao commercial and trade company Limited
Polypropylene fiber	3-19 mm	Bingcheng county Boyang thermal insulation material sales department
			Terpene phenol resin	803L	Dongguan city luxury chemical Co., Ltd

Example 1

Referring to fig. 1, the compression-resistant asphalt pavement mixture is prepared by the following steps:

the method comprises the following steps: weighing 26kg of terpene-phenol resin according to a set proportion, and heating the terpene-phenol resin to 80 ℃;

step two: weighing 1.25kg of polypropylene fiber and 6kg of inorganic salt according to a set proportion, wherein the inorganic salt is sodium chloride, adding the polypropylene fiber and the sodium chloride into the preheated terpene-phenol resin, stirring for 12s at a rotation speed of 1500r/min, and uniformly mixing to obtain a first mixture;

step three: weighing 50kg of limestone, 25kg of diabase, 25kg of basalt and 5kg of filler according to a set proportion, wherein the filler is fly ash, mixing the limestone and diabase, heating to 180 ℃, adding the heated aggregate and the filler into the first mixture together, stirring for 12s at the rotation speed of 6500r/min, and uniformly mixing to obtain a second mixture; step four: weighing 10kg of petroleum asphalt according to a set proportion, heating the petroleum asphalt to 185 ℃, adding the heated petroleum asphalt into the second mixture in the third step, keeping the temperature at 185 ℃, rotating at 7400r/min, mixing for 85s, and discharging to obtain an asphalt mixture.

Example 2

The compression-resistant asphalt pavement mixture is prepared by the following steps:

the method comprises the following steps: weighing 5kg of terpene-phenol resin according to a set proportion, and heating the terpene-phenol resin to 100 ℃;

step two: weighing 3.5kg of polypropylene fiber and 33kg of inorganic salt according to a set proportion, wherein the inorganic salt is magnesium chloride, adding the polypropylene fiber and the magnesium chloride into the preheated terpene-phenol resin, and stirring at a rotation speed of 1500r/min for 10s to obtain a first mixture;

step three: weighing 150kg of limestone, 75kg of diabase, 75kg of basalt and 15kg of filler according to a set proportion, wherein the filler is cement, mixing the limestone and the diabase, heating to 190 ℃, adding the heated aggregate and the filler into the first mixture together, stirring for 14s at the rotation speed of 6500r/min, and uniformly mixing to obtain a second mixture;

step four: weighing 15kg of petroleum asphalt according to a set proportion, heating the petroleum asphalt to 175 ℃, adding the heated petroleum asphalt into the second mixture in the third step, keeping the temperature at 175 ℃, rotating at 7400r/min, mixing for 80s, and discharging to obtain the asphalt mixture.

Example 3

the method comprises the following steps: weighing 10kg of terpene-phenol resin according to a set proportion, and heating the terpene-phenol resin to 148 ℃;

step two: weighing 2.5kg of polypropylene fiber and 20kg of inorganic salt according to a set proportion, wherein the inorganic salt is calcium chloride, adding the polypropylene fiber and the calcium chloride into the preheated terpene-phenol resin, and stirring at a rotation speed of 1500r/min for 15s to obtain a first mixture;

step three: weighing 100kg of limestone, 50kg of diabase, 50kg of basalt and 8kg of filler according to a set proportion, wherein the filler is mineral powder, mixing the limestone and the diabase, heating to 185 ℃, adding the heated aggregate and the filler into the first mixture, stirring for 15s at the rotation speed of 6500r/min, and uniformly mixing to obtain a second mixture;

step four: weighing 12kg of petroleum asphalt according to a set proportion, heating the petroleum asphalt to 175 ℃, adding the heated petroleum asphalt into the second mixture in the third step, keeping the temperature at 175 ℃, rotating at 7400r/min, mixing for 75s, and discharging to obtain an asphalt mixture.

Example 4

A compression-resistant asphalt pavement mixture, which is different from example 3 in that aggregate is replaced by 200kg of granite.

Example 5

A compression-resistant asphalt pavement mixture, which is different from example 3 in that aggregates are replaced by 200kg of olivine.

Example 6

A compression-resistant bituminous pavement mixture, which differs from example 3 in that the aggregate is replaced by 200kg andesite.

Example 7

The difference between the asphalt pavement mixture and the embodiment 3 is that the dosage of the terpene-phenol resin is 5kg, the dosage of the calcium chloride is 7.5kg, and the mass ratio of the terpene-phenol resin to the calcium chloride is 1: 1.5.

Example 8

The difference between the asphalt pavement mixture and the embodiment 3 is that the dosage of the terpene-phenol resin is 22kg, the dosage of the calcium chloride is 33kg, and the mass ratio of the terpene-phenol resin to the calcium chloride is 1: 1.5.

Example 9

The pressure-resistant asphalt pavement mixture is different from the asphalt pavement mixture in example 3 in that the dosage of the terpene-phenol resin is 10kg, the dosage of the calcium chloride is 15kg, and the mass ratio of the terpene-phenol resin to the calcium chloride is 1: 1.5.

Example 10

An asphalt pavement mixture for resisting compression is different from that in example 9 in that calcium chloride is replaced by sodium chloride.

Example 11

An asphalt pavement mixture for resisting compression is different from that of example 9 in that calcium chloride is replaced by magnesium chloride.

Example 12

The difference between the compression-resistant asphalt pavement mixture and the compression-resistant asphalt pavement mixture in example 9 is that the dosage of the polypropylene fiber is 1.25kg, and the dosage of the terpene-phenol resin is 10kg, and the mass ratio of the polypropylene fiber to the terpene-phenol resin is 1: 8.

Example 13

The difference between the compression-resistant asphalt pavement mixture and the mixture in example 9 is that the dosage of the polypropylene fiber is 1.43kg, and the dosage of the terpene-phenol resin is 10kg, and the mass ratio of the polypropylene fiber to the terpene-phenol resin is 1: 7.

Example 14

The difference between the compression-resistant asphalt pavement mixture and the compression-resistant asphalt pavement mixture in example 9 is that the dosage of the polypropylene fiber is 2kg, and the dosage of the terpene-phenol resin is 10kg, and the mass ratio of the polypropylene fiber to the terpene-phenol resin is 1: 5.

Example 15

An asphalt pavement mixture for compression resistance, which is different from that in example 14 in that the raw materials further comprise amino silicone oil in an amount of 7kg, wherein in the fourth step, the amino silicone oil is added together when adding petroleum asphalt to the second mixture.

Example 16

An asphalt pavement mixture for compression resistance, which is different from that in example 14 in that the raw materials further comprise amino silicone oil in an amount of 12kg, wherein in the fourth step, the amino silicone oil is added together when adding petroleum asphalt to the second mixture.

Example 17

The difference between the compression-resistant asphalt pavement mixture and the example 16 is that the dosage of the polypropylene fiber is 2kg, the dosage of the amino silicone oil is 8kg, and the mass ratio of the polypropylene fiber to the amino silicone oil is 1: 4.

Example 18

The difference between the compression-resistant asphalt pavement mixture and the example 16 is that the dosage of the polypropylene fiber is 2kg, and the dosage of the amino silicone oil is 10kg, and the mass ratio of the polypropylene fiber to the amino silicone oil is 1: 5.

Application example

Application examples 1 to 3

step two: spreading the prepared asphalt mixture on a pavement base, wherein the temperature maintenance value is shown in table 2, and when the part has short materials or excessive asphalt mixture, the asphalt mixture is properly repaired or removed to form a first layer of asphalt;

step three: rolling the first layer of asphalt, pressing the first layer of asphalt from the curb at one side into the road, wherein the rolling times are shown in table 2;

step four: continuously paving the asphalt mixture on the first layer of asphalt, and maintaining the temperature as shown in table 2 to form a second layer of asphalt;

step six: the compacted road surface was maintained by spraying water for the maintenance days shown in table 2.

TABLE 2 Components and Process parameters of application examples 1-3

	Application example 1	Application example 2	Application example 3
				Step two temperature maintenance value	130℃	160℃	170℃
Number of rolling in step three	3 times of	3 times of	4 times (twice)
				Step four temperature maintenance value	100℃	110℃	140℃
Number of rolling in step five	3 times of	3 times of	4 times (twice)
				Six days of persistence	1 day	2 days	3 days
Asphalt mixture	Example 1	Example 2	Example 3

Application example

Application examples 4 to 18

The difference between the pavement construction method of the compression-resistant asphalt pavement mixture and the application example 3 is that the asphalt mixture adopted in the fourth step is obtained from the following sources as shown in the table 3:

TABLE 3 Components and Process parameters of application examples 4 to 18

Application example 4	Application example 5	Application example 6	Application example 7
				Asphalt mixture	Example 4	Example 5	Example 6	Example 7
Application example 8	Application example 9	Application example 10	Application example 11
				Asphalt mixture	Example 8	Example 9	Example 10	Example 11
Application example 12	Application example 13	Application example 14	Application example 15
				Asphalt mixture	Example 12	Example 13	Example 14	Example 15
Application example 16	Application example 17	Application example 18
				Asphalt mixture	Example 16	Example 17	Example 18

Comparative example

Comparative example 1

The pressure-resistant asphalt pavement mixture is different from the mixture in the embodiment 3 in that the polypropylene fibers are replaced by a mixture of limestone, diabase and basalt which are mixed according to the mass ratio of 2:1: 1.

Comparative example 2

The pressure-resistant asphalt pavement mixture is different from the mixture in the embodiment 3 in that the terpene-phenol resin is replaced by a mixture of limestone, diabase and basalt which are mixed according to the mass ratio of 2:1: 1.

Comparative example 3

The pressure-resistant asphalt pavement mixture is different from the mixture in the embodiment 3 in that the polypropylene fiber and the terpene phenol resin are replaced by a mixture of limestone, diabase and basalt which are mixed according to the mass ratio of 2:1: 1.

Comparative example 4

The difference between the compression-resistant asphalt pavement mixture and the embodiment 3 is that the calcium chloride is replaced by a mixture of limestone, diabase and basalt which are mixed according to the mass ratio of 2:1: 1.

Comparative example 5

The pressure-resistant asphalt pavement mixture is different from the mixture in the embodiment 3 in that the terpene-phenol resin and the calcium chloride are replaced by a mixture of limestone, diabase and basalt which are mixed according to the mass ratio of 2:1: 1.

Comparative example 6

The pressure-resistant asphalt pavement mixture is different from the mixture in the embodiment 16 in that the polypropylene fibers are replaced by a mixture of limestone, diabase and basalt which are mixed according to the mass ratio of 2:1: 1.

Comparative example 7

The difference between the compression-resistant asphalt pavement mixture and the embodiment 16 is that the polypropylene fiber and the amino silicone oil are replaced by a mixture of limestone, diabase and basalt which are mixed according to the mass ratio of 2:1: 1.

Performance test

The plastic deformation resistance is detected by JTGE20-2011 test procedure for road engineering asphalt and asphalt mixture, and the flow value (mm) of the asphalt mixtures of examples 1-18 and comparative examples 1-7 is detected; the flow value in the range of 1.5-4mm meets the qualified standard of the embodiment of the application, and the lower the flow value in the range, the better the plastic deformation resistance of the asphalt mixture;

the low-temperature bonding performance is detected by adopting JTGE20-2011 test procedure for road engineering asphalt and asphalt mixtures to determine the broken stone falling rate (%) of the asphalt mixtures of examples 1-18 and comparative examples 1-7 at-18 ℃; the falling rate of the crushed stones is in the range of 2% -9% and meets the qualified standard of the embodiment of the application, and the lower the falling rate of the crushed stones is in the range, the better the low-temperature bonding performance of the asphalt mixture is;

temperature sensitivity, namely detecting the softening point (DEG C) of the asphalt mixtures of examples 1-18 and comparative examples 1-7 by JTGE20-2011 test procedure for road engineering asphalt and asphalt mixtures; the softening point in the range of 77-100 ℃ meets the qualified standard of the embodiment of the application, and the higher the softening point value in the range, the better the temperature sensitivity of the asphalt mixture.

TABLE 4 summary of test data for examples 1-18 and comparative examples 1-7

According to the comparison of the test data of the example 3 and the comparative example 1 in the table 4, the flow value and the broken stone falling rate of the asphalt mixture are reduced and the softening point of the asphalt mixture is improved by adding the polypropylene fiber into the asphalt mixture. After the polypropylene fiber is added into the asphalt mixture, a gel layer can be formed and can be quickly bonded with the asphalt mixture, so that the bonding speed between asphalt and aggregate is improved, the cohesion of the asphalt mixture is effectively enhanced, and the mechanical strength of the asphalt mixture is enhanced.

According to the comparison of the test data of the example 3 and the comparative example 2 in the table 4, the flow value and the broken stone falling rate of the asphalt mixture are reduced and the softening point of the asphalt mixture is improved by adding the terpene-phenol resin into the asphalt mixture. After the terpene-phenol resin is added into the asphalt mixture, a network structure of a cross-linking space can be formed and filled in the pores of the asphalt mixture, so that the hydrophobicity of the asphalt is improved, the bonding strength between the asphalt and the aggregate is improved, and the overall anti-cracking performance of the asphalt mixture can be enhanced.

According to comparison of test data of the example 3 and the comparative examples 1 to 3 in the table 4, the terpene-phenol resin and the polypropylene fiber are added into the asphalt mixture, and the terpene-phenol resin and the polypropylene fiber have synergistic effect, so that the low-temperature sensitivity of the asphalt mixture is reduced, the purpose of further effectively improving the softening point of the asphalt mixture is achieved, and the low-temperature cracking resistance of the asphalt mixture is effectively enhanced.

According to the comparison of the test data of the example 3 and the comparative example 4 in the table 4, the flow value and the broken stone falling rate of the asphalt mixture are reduced and the softening point of the asphalt mixture is improved by adding calcium chloride into the asphalt mixture. After the calcium chloride is added into the asphalt mixture, the plastic deformation resistance and the low-temperature bonding property of the asphalt mixture are reduced, and the mechanical property of the asphalt mixture is further enhanced.

According to the comparison of the test data of example 3 and comparative examples 2 and 4-5 in table 4, it can be seen that the addition of the inorganic salt and the terpene-phenol resin to the asphalt mixture produces a synergistic effect, which can further effectively reduce the flow value and the falling rate of the asphalt mixture. After the inorganic salt is added, the terpene-phenol resin can adsorb free cations, so that the free cations are combined with polar anions in the terpene-phenol resin, and the cations form a protective layer on the surface of the terpene-phenol resin, thereby effectively improving the integrity of a cross-linked network structure of the terpene-phenol resin, further enhancing the binding force of an asphalt mixture and the terpene-phenol resin, and improving the anti-cracking performance of asphalt concrete.

According to the comparison of the test data of the examples 3 to 6 in the table 4, the flow value and the broken stone falling rate of the asphalt mixture can be reduced and the softening point of the asphalt mixture can be improved by adding the limestone, the diabase and the basalt into the asphalt mixture and controlling the mass ratio of the limestone, the diabase and the basalt. The limestone has better compression resistance and corrosion resistance, the diabase has better wear resistance and corrosion resistance, and the basalt has better wear resistance and corrosion resistance, and the overall mechanical property of the asphalt mixture can be effectively enhanced by utilizing the characteristics of the limestone, the diabase and the basalt.

According to the comparison of the test data of the examples 3 and 7-11 in the table 4, compared with sodium chloride and magnesium chloride, the calcium chloride added into the asphalt mixture can more effectively generate a synergistic effect with the terpene-phenol resin, the softening point of the asphalt mixture is improved, the flow value and the broken stone falling rate of the asphalt mixture can be further reduced, and in addition, the synergistic effect generated between the terpene-phenol resin and the calcium chloride can be better improved by controlling the weight ratio of the terpene-phenol resin to the calcium chloride in the asphalt concrete to be 1: 1.5.

According to the comparison of the test data of examples 9, 12-14 in table 4, it can be seen that by controlling the weight ratio of the polypropylene fiber to the terpene-phenol resin in the asphalt concrete to be 1 (4-5), the synergistic effect generated between the polypropylene fiber and the terpene-phenol resin can be further effectively enhanced to further increase the softening point of the asphalt mixture, thereby further improving the cracking resistance of the asphalt concrete while reducing the low-temperature sensitivity of the asphalt mixture.

As can be seen from the comparison of the test data of examples 14 to 16 and comparative examples 6 to 7 in Table 4, the amino silicone oil can generate a synergistic effect with the polypropylene fibers by adding the amino silicone oil to the asphalt mixture. After the amino silicone oil is added, the polypropylene fiber can be quickly combined with the polypropylene fiber, and the purpose of softening the polypropylene fiber is achieved, so that the speed of forming a gel layer by the polypropylene fiber can be effectively accelerated, the bonding speed of the polypropylene fiber and the asphalt mixture is improved, the flow value and the broken stone falling rate of the asphalt mixture are further reduced, and the purpose of enhancing the pressure resistance of the asphalt mixture is achieved.

According to the comparison of the test data of the examples 16 to 18 in the table 4, when the weight ratio of the polypropylene fiber to the amino silicone oil is controlled to be 1 (4-5), the synergistic effect of the polypropylene fiber and the amino silicone oil is better, the flow value and the broken stone falling rate of the asphalt mixture can be further effectively reduced, and the anti-plastic deformation capacity and the low-temperature bonding performance of the asphalt mixture are enhanced to further enhance the anti-pressure performance of the asphalt mixture.

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

1. The compression-resistant asphalt pavement mixture is characterized by comprising the following raw materials in parts by weight:

petroleum asphalt: 10-15 parts;

aggregate: 100-300 parts;

filling: 5-15 parts;

polypropylene fiber: 1.25-3.5 parts;

terpene phenol resin: 5-26 parts;

inorganic salts: 6 to 33 portions.

2. The compression-resistant asphalt pavement mixture as claimed in claim 1, wherein: the aggregate comprises limestone with the particle size specification of 5-10mm, diabase with the particle size specification of 10-15mm and basalt with the particle size specification of 0.1-2mm, and the weight ratio of the limestone to the diabase to the basalt is 2:1: 1.

3. The compression-resistant asphalt pavement mixture as claimed in claim 1, wherein said inorganic salt is one or more of sodium chloride, calcium chloride and magnesium chloride.

4. The compression-resistant asphalt pavement mixture as claimed in claim 1, wherein: the inorganic salt is calcium chloride, the terpene-phenol resin accounts for 5-22 parts by weight, the calcium chloride accounts for 7.5-33 parts by weight, and the weight ratio of the terpene-phenol resin to the calcium chloride is 1: 1.5.

5. The compression-resistant asphalt pavement mixture as claimed in claim 1, wherein: the weight ratio of the polypropylene fiber to the terpene-phenol resin is 1 (5-8).

6. The compression-resistant asphalt pavement mixture as claimed in claim 1, wherein: the compression-resistant asphalt pavement mixture also comprises 7-12 parts of amino silicone oil by weight.

7. The compression-resistant asphalt pavement mixture as claimed in claim 6, wherein: the weight ratio of the polypropylene fiber to the amino silicone oil is 1 (4-5).

8. A method for preparing an asphalt pavement mixture for compression resistance according to any one of claims 1 to 7, comprising the steps of:

step four: and (3) weighing the petroleum asphalt according to a set proportion, heating the petroleum asphalt to 175-185 ℃, adding the heated petroleum asphalt into the second mixture obtained in the third step, stirring for 75-85 seconds under the condition of heat preservation, and discharging to obtain an asphalt mixture.

9. The method for preparing an asphalt pavement mixture according to claim 8, wherein 7 to 10 parts by weight of amino silicone oil is added in the fourth step when the petroleum asphalt is added to the second mixture.

10. A pavement construction method of a compression-resistant asphalt pavement mixture, which is prepared by the preparation method of the compression-resistant asphalt pavement mixture according to any one of claims 8 to 9, and is characterized by comprising the following steps: