阅读说明：本技术 一种水泥混凝土路面长寿命化加铺铺装方法 (Long-life additional-pavement paving method for cement concrete pavement ) 是由 陶俊 李志勇 周明 邹建效 龚杰琳 刘伟 叶文雅 黄冲 朱汉华 于 2021-08-13 设计创作，主要内容包括：本发明提供一种水泥混凝土路面长寿命化加铺铺装方法,包括如下步骤：1)水泥混凝土基面处理；2)硬质化乳化沥青粘层的铺撒；3)1.5-2.5cm富油砼应力吸收层铺筑；4)改性乳化沥青粘层的铺撒；5)6-12cm浇灌式复合路面的铺装。该方法得到的组合铺装层具有抗反射裂缝强,能够减薄铺装层厚度,抗车辙效果好、抗滑、耐磨、长寿命的特点。(The invention provides a long-life additional paving method for a cement concrete pavement, which comprises the following steps: 1) treating a cement concrete base surface; 2) spreading a hardened emulsified asphalt adhesive layer; 3) paving a stress absorption layer of the oil-rich concrete of 1.5-2.5 cm; 4) spreading a modified emulsified asphalt adhesive layer; 5) paving a 6-12cm pouring type composite pavement. The combined pavement layer obtained by the method has the characteristics of strong anti-reflection crack, capability of reducing the thickness of the pavement layer, good anti-rutting effect, skid resistance, wear resistance and long service life.)

1. A long-life additional paving method for a cement concrete pavement is characterized by comprising the following steps: the method comprises the following steps:

1) treating a cement concrete base surface: before the cement concrete pavement is paved, pouring cracks, treating the cracks by adopting a joint tape with the width of 5-20cm, and carrying out plate replacement treatment on the seriously damaged part by adopting concrete with the same strength or above;

2) spreading a hard emulsified asphalt adhesive layer: after the cement concrete base surface is cleaned and the diseases are treated, spreading hard emulsified asphalt by using a synchronous chip sealer, wherein the spreading amount of the hard emulsified asphalt is 0.5-0.7kg/m²；

3) Paving an oil-rich concrete stress absorption layer: the oil-rich concrete stress absorbing layer is prepared by mixing 3-5cm stone, 0-3cm stone, mineral powder, asphalt, fiber and elastic polymer particles in an asphalt mixing plant, wherein the 3-5cm stone: 0-3cm stone: mineral powder: asphalt: fiber: the mass ratio of the elastic polymer particles is (30-60): (30-60): 10: (8-11):(0.2-0.4): (0.6-2.0);

4) spreading a modified emulsified asphalt adhesive layer: spreading SBS modified emulsified asphalt adhesive layer in the amount of 0.5-0.7kg/m before spreading the upper layer of the composite poured road surface after the oil-rich concrete stress absorbing layer is cooled to below 40 deg.c²；

5) Paving an upper surface layer of the pouring type composite pavement;

a. top layer composition of pouring type composite pavement

The upper surface layer of the pouring type composite pavement is formed by compounding large-gap asphalt concrete and a high-fluidity early-strength grouting material;

the large-gap asphalt mixture is prepared from coarse aggregates, mineral powder, modified asphalt, fibers and a high-viscosity agent according to the mass ratio of 100: (2-3): (2-5): (0.1-0.3): (0-0.7);

the porosity of the large-gap asphalt mixture is 23-33%;

the high-fluidity grouting material consists of cement, admixture, water and synergist, wherein the cement: blending material water: the mass ratio of the synergist is 100: (30-200): (30-70): (3-10);

b. paving the upper layer of the pouring type composite pavement:

paving a large-gap asphalt mixture matrix, wherein the paving thickness is 6-14cm, when the temperature of the large-gap asphalt mixture is reduced to below 60 ℃, uniformly pouring the prepared high-fluidity grouting material on the surface of the large-gap asphalt mixture to form a slurry piling state with the thickness of more than 1cm, pushing redundant surface slurry to a position to be irrigated by adopting a manual or mechanical brush to enable the surface to have a neat exposed stone structure, and maintaining for 1-3h after grouting is finished, so that the vehicle can be put on.

2. The long-life additional paving method for the cement concrete pavement as recited in claim 1, characterized in that: the preparation process of the hardened emulsified asphalt in the step 2) comprises the following steps:

preparing a soap solution: adding the measured emulsifier and stabilizer into water, stirring and heating to 50-60 deg.C, and regulating pH of the water solution to 1.5-2.5 with hydrochloric acid to obtain soap solution. The mass ratio of the water, the emulsifier and the stabilizer is 100 (5-30) to 0.5-2.5;

adding the melted hard asphalt and the soap solution into a colloid mill according to the mass ratio of 50 (30-50), and grinding for 2-3 cycles to obtain the hard emulsified asphalt.

The hard asphalt is any one of 30# base asphalt, 50# base asphalt and rock asphalt;

the emulsifier is composed of a cationic emulsifier and a nonionic emulsifier according to the mass ratio of 1 (1-3); the stabilizer is composed of sodium hydroxypropyl cellulose and ammonium chloride according to the proportion of 1 (2-4).

3. The long-life additional paving method for the cement concrete pavement as recited in claim 1, characterized in that: the preparation process of the elasticity-increasing polymer particles in the step 3) comprises the following steps: 100 parts by mass of styrene-butadiene-styrene block copolymer, 10-60 parts by mass of tackifying resin and 3-40 parts by mass of compatilizer are put into a mixer, high-speed stirring is carried out for 0.5-1h at the temperature of 50-80 ℃, then 30-200 parts by mass of rubber powder and 1-10 parts by mass of cosolvent are added, high-speed stirring is continued for 0.2-1h, finally 5-30 parts by mass of dispersant and 1-5 parts by mass of colorant are added, low-speed stirring is carried out for 10-30 min, and granulation is carried out by adopting a dough kneading machine, so that a product with uniform particle size can be obtained;

the styrene-butadiene-styrene block copolymer is composed of linear SBS and star SBS in the mass ratio of 1 (0.2-5).

4. The long-life additional paving method for the cement concrete pavement as recited in claim 1, characterized in that: the synergist in the step 5) consists of a water reducing agent and an early strength agent according to the mass ratio of 1 (0.01-0.4);

the water reducing agent is composed of a powdery naphthalene water reducing agent and a powdery polycarboxylic acid water reducing agent according to the mass ratio of 1 (0.2-3).

5. The long-life additional paving method for the cement concrete pavement as recited in claim 1, characterized in that: the cement is formed by mixing one or more of high-alumina cement, sulphoaluminate cement and oil well cement, and the proportion is random when the cements are mixed; the admixture is formed by mixing one or more of mineral powder, fly ash and silica fume, and the proportion is arbitrary when the admixtures are mixed.

6. The long-life additional paving method for the cement concrete pavement as claimed in claim 3, wherein the additional paving method comprises the following steps: the compatilizer is rubber oil; the cosolvent is diesel oil; the dispersant is any one of kaolin, attapulgite and diatomite.

7. The long-life additional paving method for the cement concrete pavement as claimed in claim 4, wherein the additional paving method comprises the following steps: the early strength agent is one of lithium chloride and lithium carbonate.

Technical Field

The invention relates to the field of novel building materials and the field of highway engineering application, in particular to a long-life additional paving method for a cement concrete pavement.

Background

The cement concrete pavement is changed into the asphalt pavement in the last period of the last century in China. The new-built higher-grade pavement is basically mainly an asphalt pavement, and the cement concrete pavement of the old pavement has a large proportion of an asphalt surface layer of 6-12cm additionally paved on the surface of the cement concrete pavement. But the reflective cracks appear after the application for less than 1 year, and the road surface has serious rutting after the application for 2 years. After that, a large number of scientific researchers add anti-cracking measures such as polyester glass fiber cloth, hot asphalt, gravel sealing layers, rubber asphalt stress absorbing layers and the like on the cement concrete base surface, although the occurrence of crack reflection is delayed, the effect is not obvious. In addition, on a cement concrete pavement with high rigidity, the flexible asphalt concrete is easy to deform under the action of load and high temperature, and the driving safety and comfort are greatly influenced.

At present, a large amount of white and black pavements face the problem of overhaul and transformation, the thickness of a cement concrete layer is generally 20-26cm, if the cement concrete is crushed and excavated, on one hand, a large amount of noise is generated, a large amount of solid wastes are generated, on the other hand, a road base layer is damaged, the construction cost is further increased, and the problem is not in accordance with the mainstream of the resource-saving society.

Therefore, a paving method which is convenient to construct and does not need to excavate a cement concrete pavement is needed, so that the service life of the pavement is prolonged, resource waste is avoided, the construction period is shortened, and the fund is saved.

Disclosure of Invention

The invention aims to provide a long-life additional paving method for a cement concrete pavement, which solves the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a long-life additional paving method for a cement concrete pavement comprises the following steps:

1) treating a cement concrete base surface: before the cement concrete pavement is paved, pouring cracks, treating the cracks by adopting a joint tape with the width of 5-20cm, and carrying out plate replacement treatment on the seriously damaged part by adopting concrete with the same strength or above;

2) spreading a hard emulsified asphalt adhesive layer: after the cement concrete base surface is cleaned and the diseases are treated, spreading hard emulsified asphalt by using a synchronous chip sealer, wherein the spreading amount of the hard emulsified asphalt is 0.5-0.7kg/m²；

3) Paving an oil-rich concrete stress absorption layer: the oil-rich concrete stress absorbing layer is prepared by mixing 3-5cm stone, 0-3cm stone, mineral powder, asphalt, fiber and elastic polymer particles in an asphalt mixing plant, wherein the 3-5cm stone: 0-3cm stone: mineral powder: asphalt: fiber: the mass ratio of the elastic polymer particles is (30-60): (30-60): 10: (8-11):(0.2-0.4): (0.6-2.0);

4) spreading a modified emulsified asphalt adhesive layer: spreading SBS modified emulsified asphalt adhesive layer in the amount of 0.5-0.7kg/m before spreading the upper layer of the composite poured road surface after the oil-rich concrete stress absorbing layer is cooled to below 40 deg.c²；

5) Paving an upper surface layer of the pouring type composite pavement;

a. top layer composition of pouring type composite pavement

The upper surface layer of the pouring type composite pavement is formed by compounding large-gap asphalt concrete and a high-fluidity early-strength grouting material;

the large-gap asphalt mixture is prepared from coarse aggregates, mineral powder, modified asphalt, fibers and a high-viscosity agent according to the mass ratio of 100: (2-3): (2-5): (0.1-0.3): (0-0.7);

the porosity of the large-gap asphalt mixture is 23-33%;

the high-fluidity grouting material consists of cement, admixture, water and synergist, wherein the cement: blending material water: the mass ratio of the synergist is 100: (30-200): (30-70): (3-10);

b. paving the upper layer of the pouring type composite pavement:

paving a large-gap asphalt mixture matrix, wherein the paving thickness is 6-14cm, when the temperature of the large-gap asphalt mixture is reduced to below 60 ℃, uniformly pouring the prepared high-fluidity grouting material on the surface of the large-gap asphalt mixture to form a slurry piling state with the thickness of more than 1cm, pushing redundant surface slurry to a position to be irrigated by adopting a manual or mechanical brush to enable the surface to have a neat exposed stone structure, and maintaining for 1-3h after grouting is finished, so that the vehicle can be put on.

As a preferred embodiment of the present invention, the preparation process of the hardened emulsified asphalt in step 2) comprises:

preparing a soap solution: adding the measured emulsifier and stabilizer into water, stirring and heating to 50-60 deg.C, and regulating pH of the water solution to 1.5-2.5 with hydrochloric acid to obtain soap solution. The mass ratio of the water, the emulsifier and the stabilizer is 100 (5-30) to 0.5-2.5;

adding the melted hard asphalt and the soap solution into a colloid mill according to the mass ratio of 50 (30-50), and grinding for 2-3 cycles to obtain the hard emulsified asphalt.

The hard asphalt is any one of 30# base asphalt, 50# base asphalt and rock asphalt;

the emulsifier is composed of a cationic emulsifier and a nonionic emulsifier according to the mass ratio of 1 (1-3); the stabilizer is composed of sodium hydroxypropyl cellulose and ammonium chloride according to the proportion of 1 (2-4).

As a preferred embodiment of the present invention, the preparation process of the elasticity-increasing polymer particles in step 3) is: 100 parts by mass of styrene-butadiene-styrene block copolymer, 10-60 parts by mass of tackifying resin and 3-40 parts by mass of compatilizer are put into a mixer, high-speed stirring is carried out for 0.5-1h at the temperature of 50-80 ℃, then 30-200 parts by mass of rubber powder and 1-10 parts by mass of cosolvent are added, high-speed stirring is continued for 0.2-1h, finally 5-30 parts by mass of dispersant and 1-5 parts by mass of colorant are added, low-speed stirring is carried out for 10-30 min, and granulation is carried out by adopting a dough kneading machine, so that a product with uniform particle size can be obtained;

the styrene-butadiene-styrene block copolymer is composed of linear SBS and star SBS in the mass ratio of 1 (0.2-5).

As a preferred embodiment of the invention, the synergist in the step 5) consists of a water reducing agent and an early strength agent according to a mass ratio of 1 (0.01-0.4);

the water reducing agent is composed of a powdery naphthalene water reducing agent and a powdery polycarboxylic acid water reducing agent according to the mass ratio of 1 (0.2-3).

As a preferred embodiment of the invention, the cement is one or a mixture of more of high alumina cement, sulphoaluminate cement and oil well cement, and when the cements are mixed, the proportion is arbitrary; the admixture is formed by mixing one or more of mineral powder, fly ash and silica fume, and the proportion is arbitrary when the admixtures are mixed.

In a preferred embodiment of the present invention, the compatibilizer is rubber oil; the cosolvent is diesel oil; the dispersant is any one of kaolin, attapulgite and diatomite.

In a preferred embodiment of the present invention, the early strength agent is one of lithium chloride and lithium carbonate.

Compared with the prior art, the invention has the following beneficial effects:

(1) the invention provides the structural form of a hardened emulsified asphalt adhesive layer, an oil-rich concrete stress absorbing layer of 1.5-2.5cm and an upper surface layer of an poured composite pavement for the first time in the field, not only fully utilizes the waste asphalt mixture, but also achieves the purpose of high rutting resistance from the aspects of materials and structures, thereby realizing the long service life and low carbonization of the road.

(2) The upper layer of the invention uses the cement-asphalt pouring type composite pavement material, is formed by compounding the flexible large-gap asphalt mixture matrix and the rigid cement-based grouting material filler, has the excellent characteristics of rigidity and flexibility, has the flexibility of the asphalt concrete pavement and the rigidity of the cement concrete, simultaneously has high wear resistance, sliding resistance, flatness, anti-rutting performance and anti-shearing performance, and improves the overall anti-rutting performance of the pavement.

(3) The oil-rich concrete stress absorbing layer plays a role in good interlayer connection, stress absorption and inhibition of various reflection cracks, well prevents interlayer slippage, and has the effect of adjusting the pavement evenness. The traditional interlaminar treatment materials such as rubber asphalt stress absorbing layer geotextile are not firmly bonded with a cement concrete base surface on one hand, and are thin on the other hand, so that the reflection of a tip crack is difficult to inhibit. In addition, the high-elastic polymer particles prepared by the method are added into the oil-rich concrete stress absorption layer, so that the softening point of asphalt is increased to more than 95 ℃, the elastic recovery rate reaches 99%, the fatigue life of the oil-rich concrete is prolonged by 2 times, and the effects of high-temperature bonding, high-temperature shearing resistance, slippage resistance, tip crack expansion resistance and stress absorption are greatly improved. In addition, the oil-rich concrete stress absorbing layer can greatly disperse the compressive stress caused by the vehicle load of the vehicle wheel, and can eliminate the bending and tensile stress of upward expansion of the lower surface layer, thereby inhibiting the upward expansion of the reflection cracks, particularly the tip reflection cracks.

(4) The hardened emulsified asphalt adopted by the invention is used as the treatment layer of the cement concrete pavement, has good bonding effect with the cement concrete base surface, and is not easy to be stuck and rolled by automobile tires during subsequent working procedures, so that the phenomenon of bonding failure is generated. When the existing emulsified asphalt is used as a sticky layer, the existing emulsified asphalt is easily rolled up by tires and peeled off, so that the road surface has weak points.

(5) By adopting the cement concrete long-life additional paving method, the pavement structure has more excellent road performance and durability, longer service life and more excellent anti-reflection cracks, and has very wide application prospect and use value.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic view of a composite pavement layer according to the present invention;

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Example 1:

as shown in fig. 1, a method for long-life additional paving of a cement concrete pavement comprises the following steps:

1) treating a cement concrete base surface: before the cement concrete pavement is paved, pouring cracks, treating the cracks by adopting a joint tape with the width of 5cm, and carrying out plate replacement treatment on the parts with serious damage by adopting concrete with the same strength;

2) spreading a hard emulsified asphalt adhesive layer: after the cement concrete base surface is cleaned and the diseases are treated, spreading hard emulsified asphalt by using a synchronous chip sealer, wherein the spreading amount of the hard emulsified asphalt is 0.5kg/m²；

3) Paving an oil-rich concrete stress absorption layer: the oil-rich concrete stress absorbing layer is prepared by mixing 3-5cm of stone, 0-3cm of stone, mineral powder, asphalt, fiber and elastic polymer particles in an asphalt mixing plant. 3-5cm stone: 0-3cm stone: mineral powder: asphalt: fiber: the mass ratio of the elasticity-increasing polymer particles is 30:58:10:8:0.2: 0.6;

the paving thickness of the oil-rich concrete stress absorption layer is 1.5 cm;

the asphalt is rubber asphalt;

the fiber is lignin fiber;

4) spreading a modified emulsified asphalt adhesive layer: when the oil-rich concrete stress absorbing layer is cooled to below 40 ℃, spreading the SBS modified emulsified asphalt adhesive layer before the upper layer of the poured composite pavement, wherein the spreading amount of the SBS modified emulsified asphalt is 0.5kg/m²；

5) Paving an upper surface layer of the pouring type composite pavement;

a. top layer composition of pouring type composite pavement

The upper surface layer of the pouring type composite pavement is formed by compounding large-gap asphalt concrete and a high-fluidity early-strength grouting material;

the large-gap asphalt mixture is prepared from coarse aggregates, mineral powder, modified asphalt, fibers and a high-viscosity agent according to a mass ratio of 100:2: 3: 0.1: 0.3;

the porosity of the large-gap asphalt mixture is 33%;

the high-fluidity grouting material consists of cement, admixture, water and synergistic polymer, wherein the admixture comprises the following components in percentage by weight: the mass ratio of the synergistic polymer is 100:30:30: 3;

the cement is high-alumina cement;

the admixture is composed of mineral powder and fly ash according to the mass ratio of 1: 2;

b. paving the upper layer of the pouring type composite pavement:

paving a large-gap asphalt mixture matrix, wherein the paving thickness is 6cm, when the temperature of the large-gap asphalt mixture is reduced to below 60 ℃, uniformly pouring the prepared high-fluidity grouting material on the surface of the large-gap asphalt mixture to form a slurry piling state with the thickness of 1cm, pushing redundant surface slurry to a position waiting for pouring by adopting a manual or mechanical brush to ensure that a neat exposed stone structure appears on the surface, and maintaining for 1-3h after the grouting is finished, so that the vehicle can be put on.

The preparation process of the hardened emulsified asphalt in the step 2) comprises the following steps:

preparing a soap solution: adding the measured emulsifier and stabilizer into water, stirring, heating to 50-60 deg.C, and regulating pH of the water solution to 1.5 with hydrochloric acid to obtain soap solution. The mass ratio of the water to the emulsifier to the stabilizer is 100:5: 0.5;

adding the melted hard asphalt and soap solution into a colloid mill according to the mass ratio of 50:30, and grinding for 2-3 cycles to obtain the hard emulsified asphalt.

The hard asphalt is 30# matrix asphalt;

the emulsifier is composed of a cationic emulsifier and a nonionic emulsifier according to the mass ratio of 1: 1; the stabilizer consists of sodium hydroxypropyl cellulose and ammonium chloride according to the proportion of 1: 2.

The preparation process of the elasticity-increasing polymer particles in the step 3) comprises the following steps: 100 parts by mass of styrene-butadiene-styrene block copolymer, 10 parts by mass of tackifying resin and 3 parts by mass of compatilizer are put into a mixer, stirred at a high speed for 0.5h in an environment of 50 ℃, then 30 parts by mass of rubber powder and 1 part by mass of cosolvent are added, the high-speed stirring is continued for 0.2h, finally 5 parts by mass of dispersant and 1 part by mass of colorant are added, and after the low-speed stirring is carried out for 10 minutes, the granulation is carried out by adopting a dough kneading machine, so that a product with uniform particle size can be obtained.

The styrene-butadiene-styrene block copolymer is composed of linear SBS and star SBS according to the mass ratio of 1: 0.2;

the compatilizer is rubber oil;

the cosolvent is diesel oil;

the dispersant is kaolin;

the synergist in the step 5) consists of a water reducing agent and an early strength agent according to the mass ratio of 1: 0.01;

the water reducing agent is composed of a powdery naphthalene water reducing agent and a powdery polycarboxylic acid water reducing agent according to the mass ratio of 1: 0.2;

the early strength agent is lithium chloride.

The present embodiment was tested:

1) the technical indexes of the hardened emulsified asphalt are as follows:

the bonding strength is 1.2 MPa;

2) the technical indexes of the oil-rich concrete stress absorbing layer are as follows:

the dynamic stability is 7300 times/mm;

the brittle point of the oil-rich concrete is-28 ℃;

3) the technical indexes of the pouring type composite pavement material are as follows:

the compressive strength is 13.2 MPa;

marshall stability of 26.1 KN;

the freeze-thaw splitting strength ratio is 98.5 percent;

the dynamic stability at 70 ℃ is 76000 times/mm;

the dynamic stability at 80 ℃ is 26000 times/mm;

the shear strength at 80 ℃ is 3.12 MPa;

the compression resilience modulus at 20 ℃ is 3500 MPa;

4) overall structure index of the road surface:

the overall dynamic stability at 80 ℃ is 23500 times/mm;

the fatigue life is more than or equal to 720 ten thousand times under the stress of 0.4 and the crack width of 1 cm;

example 2

A long-life additional paving method for a cement concrete pavement comprises the following steps:

1) treating a cement concrete base surface: before the cement concrete pavement is paved, the crack is grouted and treated by adopting a joint tape with the width of 10 cm. For the seriously damaged part, adopting concrete with the same strength to carry out plate replacement treatment;

2) hard emulsified asphalt adhesiveSpreading of layers: after the cement concrete base surface is cleaned and the diseases are treated, spreading hard emulsified asphalt by using a synchronous chip sealer, wherein the spreading amount of the hard emulsified asphalt is 0.7kg/m²；

3) Paving an oil-rich concrete stress absorption layer: the oil-rich concrete stress absorbing layer is prepared by mixing 3-5cm of stone, 0-3cm of stone, mineral powder, asphalt, fiber and elastic polymer particles in an asphalt mixing plant. 3-5cm stone: 0-3cm stone: mineral powder: asphalt: fiber: the mass ratio of the elasticity-increasing polymer particles is 60:35:10:10:0.4: 1;

the paving thickness of the oil-rich concrete stress absorption layer is 2.5 cm;

the asphalt is common asphalt;

the fiber is composed of polyester fiber and basalt fiber according to the proportion of 1: 0.5;

4) spreading a modified emulsified asphalt adhesive layer: when the oil-rich concrete stress absorbing layer is cooled to below 40 ℃, spreading the SBS modified emulsified asphalt adhesive layer before the upper layer of the poured composite pavement, wherein the spreading amount of the SBS modified emulsified asphalt is 0.5kg/m²；

5) Paving an upper surface layer of the pouring type composite pavement;

a. top layer composition of pouring type composite pavement

The upper surface layer of the pouring type composite pavement is formed by compounding large-gap asphalt concrete and a high-fluidity early-strength grouting material.

The large-gap asphalt mixture is prepared from coarse aggregates, mineral powder, modified asphalt, fibers and a high-viscosity agent according to a mass ratio of 100:3: 4.2: 0.4: 0;

the porosity of the large-gap asphalt mixture is 25%;

the high-fluidity grouting material consists of cement, admixture, water and a synergistic polymer, wherein the mass ratio of the cement to the admixture water to the synergistic polymer is 100:200:60: 9;

the cement is formed by mixing sulphoaluminate cement and oil well cement according to the mass ratio of 1: 1;

the admixture is mineral powder;

b. paving the upper layer of the pouring type composite pavement:

paving a large-gap asphalt mixture matrix, wherein the paving thickness is 12cm, when the temperature of the large-gap asphalt mixture is reduced to below 60 ℃, uniformly pouring the prepared high-fluidity grouting material on the surface of the large-gap asphalt mixture to form a slurry piling state with the thickness of 1cm, pushing redundant surface slurry to a position waiting for pouring by adopting a manual or mechanical brush to enable the surface to have a neat exposed stone structure, and carrying out maintenance for 2 hours after grouting to get on the vehicle.

The preparation process of the hardened emulsified asphalt in the step 2) comprises the following steps:

preparing a soap solution: adding the measured emulsifier and stabilizer into water, stirring, heating to 50-60 deg.C, and regulating pH of the water solution to 2.5 with hydrochloric acid to obtain soap solution. The mass ratio of the water to the emulsifier to the stabilizer is 100:30: 2.5;

adding the melted hard asphalt and soap solution into a colloid mill according to the mass ratio of 50:50, and grinding for 3 cycles to obtain the hard emulsified asphalt.

The hard asphalt is No. 50 matrix asphalt;

the emulsifier is composed of a cationic emulsifier and a nonionic emulsifier according to the mass ratio of 1: 3; the stabilizer consists of sodium hydroxypropyl cellulose and ammonium chloride according to the proportion of 1: 4.

The preparation process of the elasticity-increasing polymer particles in the step 3) comprises the following steps: 100 parts by mass of styrene-butadiene-styrene block copolymer, 60 parts by mass of tackifying resin and 40 parts by mass of compatilizer are put into a mixer, after high-speed stirring is carried out for 1 hour in the environment of 80 ℃, 200 parts by mass of rubber powder and 10 parts by mass of cosolvent are added, high-speed stirring is continued for 1 hour, finally 30 parts by mass of dispersant and 5 parts by mass of colorant are added, after low-speed stirring is carried out for 30 minutes, granulation is carried out by adopting a kneading machine, and a product with uniform particle size can be obtained.

The styrene-butadiene-styrene block copolymer is composed of linear SBS and star SBS according to the mass ratio of 1: 5;

the compatilizer is rubber oil;

the cosolvent is diesel oil;

the dispersing agent is attapulgite;

the synergist in the step 5) consists of a water reducing agent and an early strength agent according to the mass ratio of 1: 0.4;

the water reducing agent is composed of a powdery naphthalene water reducing agent and a powdery polycarboxylic acid water reducing agent according to the mass ratio of 1: 3;

the early strength agent is lithium carbonate.

Example 3:

a long-life additional paving method for a cement concrete pavement comprises the following steps:

1) treating a cement concrete base surface: before the cement concrete pavement is paved, pouring cracks, treating the cracks by adopting a joint tape with the width of 10cm, and carrying out plate replacement treatment on the parts with serious damage by adopting concrete with the same strength;

2) spreading a hard emulsified asphalt adhesive layer: after the cement concrete base surface is cleaned and the diseases are treated, spreading hard emulsified asphalt by using a synchronous chip sealer, wherein the spreading amount of the hard emulsified asphalt is 0.7kg/m²；

3) Paving an oil-rich concrete stress absorption layer: the oil-rich concrete stress absorbing layer is prepared by mixing 3-5cm of stone, 0-3cm of stone, mineral powder, asphalt, fiber and elastic polymer particles in an asphalt mixing plant. 3-5cm stone: 0-3cm stone: mineral powder: asphalt: fiber: the mass ratio of the elasticity-increasing polymer particles is 60:35:10:10:0.4: 1;

the paving thickness of the oil-rich concrete stress absorption layer is 2.5 cm;

the asphalt is common asphalt;

the fiber is composed of polyester fiber and basalt fiber according to the proportion of 1: 0.5;

4) spreading a modified emulsified asphalt adhesive layer: when the oil-rich concrete stress absorbing layer is cooled to below 40 ℃, spreading the SBS modified emulsified asphalt adhesive layer before the upper layer of the poured composite pavement, wherein the spreading amount of the SBS modified emulsified asphalt is 0.5kg/m²；

5) Paving an upper surface layer of the pouring type composite pavement;

a. top layer composition of pouring type composite pavement

The upper surface layer of the pouring type composite pavement is formed by compounding large-gap asphalt concrete and a high-fluidity early-strength grouting material.

The large-gap asphalt mixture is prepared from coarse aggregates, mineral powder, modified asphalt, fibers and a high-viscosity agent according to a mass ratio of 100:3: 4.2: 0.4: 0;

the porosity of the large-gap asphalt mixture is 25%;

the high-fluidity grouting material consists of cement, admixture, water and a synergistic polymer, wherein the mass ratio of the cement to the admixture water to the synergistic polymer is 100:200:60: 9;

the cement is formed by mixing sulphoaluminate cement and oil well cement according to the mass ratio of 1: 1;

the admixture is mineral powder;

b. paving the upper layer of the pouring type composite pavement:

paving a large-gap asphalt mixture matrix, wherein the paving thickness is 12cm, when the temperature of the large-gap asphalt mixture is reduced to below 60 ℃, uniformly pouring the prepared high-fluidity grouting material on the surface of the large-gap asphalt mixture to form a slurry piling state with the thickness of 1cm, pushing redundant surface slurry to a position waiting for pouring by adopting a manual or mechanical brush to enable the surface to have a neat exposed stone structure, and carrying out maintenance for 2 hours after grouting to get on the vehicle.

The preparation process of the hardened emulsified asphalt in the step 2) comprises the following steps:

preparing a soap solution: adding the measured emulsifier and stabilizer into water, stirring, heating to 50-60 deg.C, and regulating pH of the water solution to 2.5 with hydrochloric acid to obtain soap solution. The mass ratio of the water to the emulsifier to the stabilizer is 100:15: 1;

adding the melted hard asphalt and soap solution into a colloid mill according to the mass ratio of 50:40, and grinding for 2-3 cycles to obtain the hard emulsified asphalt.

The hard asphalt is No. 50 matrix asphalt;

the emulsifier is composed of a cationic emulsifier and a nonionic emulsifier according to the mass ratio of 1: 2; the stabilizer consists of sodium hydroxypropyl cellulose and ammonium chloride according to the proportion of 1: 3.

The preparation process of the elasticity-increasing polymer particles in the step 3) comprises the following steps: 100 parts by mass of styrene-butadiene-styrene block copolymer, 40 parts by mass of tackifying resin and 18 parts by mass of compatilizer are put into a mixer, after high-speed stirring is carried out for 0.6h in the environment of 60 ℃, 100 parts by mass of rubber powder and 6 parts by mass of cosolvent are added, high-speed stirring is continued for 0.5h, finally 17 parts by mass of dispersant and 3 parts by mass of colorant are added, after low-speed stirring is carried out for 20 min, granulation is carried out by adopting a dough kneading machine, and a product with uniform particle size can be obtained.

The styrene-butadiene-styrene block copolymer is composed of linear SBS and star SBS according to the mass ratio of 1: 2;

the compatilizer is rubber oil;

the cosolvent is diesel oil;

the dispersing agent is diatomite;

the synergist in the step 5) consists of a water reducing agent and an early strength agent according to the mass ratio of 1: 0.18;

the water reducing agent is composed of a powdery naphthalene water reducing agent and a powdery polycarboxylic acid water reducing agent according to the mass ratio of 1: 1.4;

the early strength agent is lithium chloride.

Comparative example:

in order to verify the effect of the present invention, 4 comparative examples were conducted to prepare a combination type test piece having a length of 600mm and a width of 400mm, and other parameters of the comparative examples were identical to those of example 1 except that the following points are shown in Table 1:

TABLE 1

Wherein the performance indexes of the mixture (SMA) of the asphalt mastic macadam are as follows: the compressive strength is 12.2MPa, the Marshall stability is 12.4KN, and the dynamic stability at 70 ℃ is 2800 times/mm; the shear strength at 70 ℃ is 0.57 MPa;

the rubber asphalt used for the 1.5cm rubber asphalt stress absorbing layer had a softening point of 62.0 ℃ and an elastic recovery of 89.4%.

The properties of the overall structure of the pavement obtained in the comparative example are shown in table 2:

TABLE 2

And cutting the combined test block, wherein the length of the test block for testing the dynamic stability is 300mm, and the width of the test block is 300 mm.

In the fatigue test, the test piece had a length of 600mm and a width of 15 mm.

Comparative example 1 is a conventional paving scheme, and comparative example 1 is inferior to example 1 in both high temperature performance and level of anti-reflective cracking capability;

compared with the embodiment 1, the fatigue life of the pavement still can not reach the level of the embodiment 1 after the pavement is continuously thickened, which shows that the technology has the effect of reducing the pavement additional thickness;

compared with the example 1, the high-temperature anti-rutting performance is basically equivalent to that of the high-temperature anti-rutting performance only by replacing the concrete interface viscous layer oil, but the anti-cracking performance is reduced by 20%, which shows that when the hard emulsified asphalt developed in the scheme is used as the cement concrete interface viscous layer oil, the high-temperature performance is not lost, and the anti-cracking performance is improved to have a more remarkable effect.

Compared with the example 1, the comparative example 4 only changes the middle treatment layer, the high-temperature anti-rutting capability is slightly reduced, but the anti-cracking capability is reduced by 53 percent, which shows that when the rich-oil concrete stress absorbing layer developed in the scheme is used as the middle treatment layer, the anti-cracking capability improving effect is very obvious and is higher than the technical level of the current rubber asphalt stress absorbing layer.

From these comparative examples, it can be seen that the novel pavement of the present invention has a reasonable structure, is excellent in both rut resistance and fatigue resistance, and can fully meet the requirement of long service life of the pavement.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.