CN-122010465-A - Crack-resistant high-strength particle size reclaimed asphalt stabilized macadam material, preparation method thereof and pavement structure

CN122010465ACN 122010465 ACN122010465 ACN 122010465ACN-122010465-A

Abstract

The invention provides an anti-cracking high-strength particle size reclaimed asphalt stabilized macadam material, a preparation method thereof and a pavement structure. The regenerated asphalt stabilized macadam material comprises a base material, supplementary asphalt and a regenerating agent, wherein the base material comprises asphalt pavement solid waste materials and large-particle-size macadam with particle size of more than 30mm and less than 50mm, the content of the asphalt pavement solid waste materials is 68% -82% based on 100% of the total mass of the base material, the content of the large-particle-size macadam is 18% -32%, the asphalt pavement solid waste materials contain old asphalt, the content of the regenerating agent is 7% -9% of the old asphalt, and the content of the supplementary asphalt is 0.86% -1.44% based on 100% of the total mass of the base material. According to the invention, the rigid framework is formed by the large-particle-size broken stone, and the solid waste material of the asphalt pavement is closely packed, so that the framework-dense structure is constructed, the splitting strength is obviously improved, the deflection value is reduced, and rutting and deformation under heavy traffic can be effectively resisted.

Inventors

WANG JIE
Wang Sudi
XU JIAN
LU RONG
LI WENRUI

Assignees

交通运输部公路科学研究所

Dates

Publication Date: 20260512
Application Date: 20260211

Claims (10)

1. A reclaimed asphalt stabilized macadam material is characterized by comprising a base material, supplementary asphalt and a reclaiming agent, wherein, The base material comprises solid waste materials of asphalt pavement and large-particle-size broken stone with particle size of more than 30mm and less than 50mm, wherein the content of the solid waste materials of asphalt pavement is 68-82%, the content of the large-particle-size broken stone is 18-32% based on 100% of the total mass of the base material, and The asphalt pavement solid waste material comprises old asphalt, and the content of the regenerant is 7% -9% of the old asphalt; the content of the supplementary asphalt is 0.86% -1.44% based on 100% of the total mass of the base material.
2. The reclaimed asphalt stabilized macadam material of claim 1, wherein the asphalt pavement solid waste material comprises an asphalt pavement solid waste material having a particle size of 8mm or less, an asphalt pavement solid waste material having a particle size of more than 8mm and less than 12mm, and an asphalt pavement solid waste material having a particle size of more than 12mm and less than 25 mm; wherein the mass ratio of the asphalt pavement solid waste material with the particle size of less than 8mm to the asphalt pavement solid waste material with the particle size of more than 8mm and less than 12mm to the asphalt pavement solid waste material with the particle size of more than 12mm and less than 25mm is (4.0-5.0) to (1.5-2.0) to (2.5-3.2).
3. The reclaimed asphalt stabilized macadam material of claim 1 or 2, wherein the solid waste asphalt pavement material has a water content of 3% or less; The content of the old asphalt is 3-5% based on 100% of the mass of the solid waste material of the asphalt pavement.
4. A reclaimed asphalt stabilized macadam material as claimed in any one of claims 1 to 3, which has a particle size of more than 4.75mm and a crushing value of 26% or less for solid waste materials of asphalt pavement of 25mm or less.
5. The reclaimed asphalt stabilized macadam material of any one of claims 1 to 4, wherein the crush value of the large-particle-diameter macadam is 26% or less and the water content of the large-particle-diameter macadam is 2% or less.
6. A method of producing a reclaimed asphalt stabilized macadam material according to any one of claims 1 to 5, comprising the step of mixing the components of the reclaimed asphalt stabilized macadam material; Preferably, the preparation method comprises the following steps: Heating the solid waste materials of the asphalt pavement to 130-150 ℃, heating the crushed stones with large particle sizes to 180-200 ℃ and heating the supplementary asphalt to 155-165 ℃; Adding heated large-particle-size crushed stone and asphalt pavement solid waste materials into a stirring pot, dry-stirring for 30-60s, adding a regenerant, adding heated supplementary asphalt, wet-stirring for 30-60s, controlling the temperature to 160-170 ℃ and discharging to prepare the regenerated asphalt stabilized crushed stone material.
7. A pavement structure is characterized by sequentially comprising an upper layer, a lower layer, a base layer, a first water stable base layer and a second water stable base layer from top to bottom, wherein the base layer comprises the reclaimed asphalt stabilized macadam material according to any one of claims 1-5.
8. The pavement structure of claim 7, wherein the construction process of the reclaimed asphalt stabilized macadam material comprises the steps of: Paving by using a paver, wherein the paving temperature is preferably not lower than 155 ℃, the loosening coefficient is 1.20-1.30, and the paving speed is 2-3m/min; And the rolling step is to adopt a combined rolling process to roll to obtain the base layer.
9. The pavement structure of claim 8, wherein the rolling step comprises an initial press, a back press, and a final press, wherein the initial press comprises vibratory rolling using a dual steel wheel roller, the back press comprises rolling using a rubber wheel roller, and the final press comprises hydrostatic pressing using a dual steel wheel roller.
10. The pavement structure of claim 7, wherein the pavement structure comprises an upper layer, a lower layer, a base layer, a first water-stable base layer and a second water-stable base layer in sequence from top to bottom, wherein the upper layer is an SMA-13 asphalt mixture, the lower layer is an AC-20 asphalt mixture, the base layer is a reclaimed asphalt stabilized crushed material layer according to any one of claims 1-5, and the first water-stable base layer and the second water-stable base layer are cement stabilized crushed layers.

Description

Crack-resistant high-strength particle size reclaimed asphalt stabilized macadam material, preparation method thereof and pavement structure Technical Field The invention relates to an anti-cracking high-strength particle size reclaimed asphalt stabilized macadam material, a preparation method thereof and a pavement structure, and belongs to the field of highway engineering reclaimed asphalt pavement materials. Background Asphalt pavement is a main structural form of high-grade highway pavement, and many asphalt pavement solid waste materials (RAP) are produced by major and middle repair every year. In order to protect the environment and reduce mining, the problem of recycling the used asphalt pavement material has recently become a focus of attention in countries around the world. The plant-mixed thermal regeneration of the asphalt pavement is the most widely applied RAP regeneration technology, but the RAP doping amount is lower and is generally not more than 30 percent. The cement stabilized macadam has the characteristics of low cost, strong bearing capacity and the like, and has been widely applied to asphalt pavement as a basic structure. However, with the recent economic development, heavy traffic gradually increases, the cement stabilized macadam semi-rigid base asphalt pavement structure bears the repeated action of wheel load during use, the cement stabilized macadam material is extremely easy to generate microcracks, the cement stabilized macadam material is also easy to generate shrinkage and thermal shrinkage cracks, and the two components are overlapped to extremely easily generate pavement reflection cracks, so that the asphalt pavement is entirely damaged. In order to solve the problems of reflection cracks, poor durability and the like commonly existing in the semi-rigid base asphalt pavement of the high-grade highway, more indoor researches on asphalt stabilized large-particle-size macadam base are carried out, and related test roads are paved. The asphalt stabilized large-particle-size macadam base layer is used as a flexible structural layer with strong flexibility and deformability, and can be used as a stress dissipation layer to obviously improve the capability of resisting reflection cracks of a pavement. However, the large-grain asphalt stabilized macadam material adopts brand new stone, no old asphalt material is adopted, the manufacturing cost is high, the use amount is very small compared with that of cement stabilized macadam, the maximum grain size of an asphalt stabilized macadam base layer is generally 25-30mm, the structural bearing capacity is about 20% lower than that of a semi-rigid base layer, and rutting is easy to generate. In view of the technical problems in the prior art, research on a high-strength anti-cracking large-proportion reclaimed asphalt stabilized macadam material becomes a technical problem to be solved urgently. Disclosure of Invention Problems to be solved by the invention The invention provides a high-strength anti-cracking large-proportion regenerated asphalt stabilized macadam material, which aims at the problems of easy cracking and damage of a semi-rigid base asphalt pavement, high cost of traditional asphalt stabilized macadam and insufficient bearing capacity. Compared with cement stabilized macadam materials, the regenerated asphalt stabilized macadam material has the advantages of reduced material cost, improved fatigue durability life, obvious green environmental protection, economy and durability, and can effectively solve the problems that the existing semi-rigid base asphalt pavement is easy to crack, has short service life and has low utilization rate of solid waste materials of the asphalt pavement. According to the invention, large-grain-size broken stone with the grain size larger than 30mm and smaller than 50mm is adopted, asphalt pavement solid waste materials are selected to replace materials with the grain size smaller than 25mm to form a skeleton compact structure, so that a large-grain-size regenerated asphalt stabilized broken stone material is formed, the anti-reflection crack capability and the structural bearing capacity of a pavement structure are improved, skeleton interlocking and fine aggregate compact filling large-grain-size skeleton void ratio are constructed, and the problems of low solid waste recycling rate of asphalt pavement, short service life of pavement, high construction energy consumption and the like are solved through reasonable structural design and construction application, so that technical support is provided for the asphalt solid waste low-carbon high-value regenerated pavement structure. The invention also provides a preparation method of the regenerated asphalt stabilized macadam material, which is simple and easy to implement, can fully utilize the solid waste materials of the asphalt pavement, is suitable for mass production, and has wide application. Solution for solving the problem The invention