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Small particle size gap gradation compact-type low-noise rubber asphalt concrete

A rubberized asphalt, small particle size technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of insufficient durability of low-noise asphalt concrete, harsh service conditions, rut damage, etc. The effect of high temperature shear deformation resistance, good low temperature crack resistance, good material durability

Active Publication Date: 2012-10-31
交通部公路科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned earlier, such low-noise asphalt concrete has insufficient durability and harsh service conditions
At the same time, due to the small particle size of the mixture, the high-temperature deformation resistance of the mixture is insufficient, and it is easy to cause rutting damage, resulting in a decrease in driving comfort

Method used

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  • Small particle size gap gradation compact-type low-noise rubber asphalt concrete

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) According to the mineral material grading range table, select the medium-sized and small-sized crushed stones in each grade as shown in the table below.

[0027]

[0028] 2) In order to ensure that the mixture has good water stability, cement is used as a filler to replace part of the mineral powder, that is, the part <0.075 in the table, and the cement content is 8% (the weight ratio of the mineral material).

[0029] 3) The mixture uses rubber asphalt as the binder. The specification of waste tire rubber powder in rubber asphalt is about 60 mesh, which is pulverized at room temperature and has a high content of natural rubber. The content of waste tire rubber powder in rubber asphalt is about 22%. The 180°C rotational viscosity index of rubber asphalt is 3.5Pa.s.

[0030] 4) The design porosity of the mixture is 5.5%, to ensure the compactness of the mixture.

[0031] 5) The high-temperature anti-deformation ability index of the mixture is: the dynamic stabil...

Embodiment 2

[0036]2) Use slaked lime as a filler to replace part of the mineral powder, that is, the part <0.075 in the table, and the amount of slaked lime is 3% (the weight ratio of the mineral material).

[0037] All the other are identical with embodiment 1.

Embodiment 3

[0039] 2) Use cement to replace part of the mineral powder, and the cement content is 5% (the weight ratio of the mineral material).

[0040] 3) The specification of waste tire rubber powder in rubber asphalt is 40-mesh rubber powder with high content of natural rubber crushed at room temperature. The content of waste tire rubber powder in rubber asphalt is about 23%. The 180°C rotational viscosity index of rubber asphalt is 4Pa.s.

[0041] 4) The design porosity of the mixture is 5% to ensure the compactness of the mixture.

[0042] All the other are identical with embodiment 1.

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Abstract

The invention provides a small particle size gap gradation compact-type low-noise rubber asphalt concrete. The mixture has the characteristics that: 1) for the mineral aggregate gradation scope of small particle size coarse aggregate gap gradation, the maximum nominal particle size of the gradation is 7.2 mm; in order to ensure compactness, the percentage composition of padding smaller than 0.075mm in the mixture is from 7 to 11 percent; and in order to ensure skid resistance, the percentage composition of small particle size gravels larger than 2.36mm in the mixture is from 65 to 75 percent; 2) cement or slaked lime is used to replace mineral powder; 3) rubber asphalt is used as binder material in the mixture; scrap tire crumb rubber in the rubber asphalt is crumb rubber which has the specification of 40 to 80 meshes, is pulverized in normal temperature and has higher content of natural rubber, and the addition amount of the scrap tire crumb rubber reaches 21 to 23 percent of the weight of the asphalt; and the 180 DEG C brook field viscosity index of the rubber asphalt is 2.5 to 4Pa. s; 4) the design porosity of the mixture is 5 to 6 percent. The invention not only has good roadperformance such as skid resistance and high temperature deformation resistance, but also has the comprehensive characteristics of good durability, wide application range and obvious reduction of noise.

Description

technical field [0001] The invention belongs to the subject of highways and urban roads, and relates to the specialty of asphalt pavement and the technical field of low-noise asphalt concrete. Background technique [0002] In order to solve the pollution problem of traffic noise in cities and surrounding roads, research on low-noise asphalt pavement has begun in the international community as early as the 1980s. Its research is mainly divided into two categories: one is the mechanism of road noise formation, and the other is to build a large number of test roads and physical projects, and compare the performance of different noise-reducing asphalt pavements after long-term follow-up observations. [0003] The driving noise on asphalt pavement comes from the friction between automobile tires and road surface. Therefore, the influence of tire pattern on friction noise was firstly analyzed in the world. The impact is different. In addition, according to the mechanism of frict...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26C04B18/22C04B14/02
CPCY02W30/91
Inventor 王旭东李美江周兴业张蕾沈国辉
Owner 交通部公路科学研究院
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