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A kind of skeleton dense type rubber asphalt ultra-thin wearing layer and preparation method thereof

A technology with dense skeleton and wear layer, which is applied in the field of building materials, can solve the problems of low internal friction resistance, no further research, and the adhesion force is easily affected by temperature.

Active Publication Date: 2021-09-10
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This rubber-modified asphalt mixture adopts continuous gradation to form a suspended dense mixture. Although this type of asphalt mixture has high cohesive force, its internal friction resistance is low, and its cohesive force is easy Affected by temperature, so its high temperature stability is poor
[0005] In the maintenance work of the ring road in the southeastern suburbs of Shanghai, the technicians carried out preliminary research and practice on the wear layer of warm-mixed rubber-modified asphalt open-graded asphalt, but only a preliminary exploration of its related performance was carried out, and no further research was carried out.

Method used

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  • A kind of skeleton dense type rubber asphalt ultra-thin wearing layer and preparation method thereof
  • A kind of skeleton dense type rubber asphalt ultra-thin wearing layer and preparation method thereof
  • A kind of skeleton dense type rubber asphalt ultra-thin wearing layer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Coarse aggregate: 72.0wt% basalt coarse aggregate;

[0063] Fine aggregate: 20.5wt% limestone fine aggregate;

[0064] Grading: Grading 1;

[0065] Grading 1

[0066] mesh size 0.075 0.15 0.3 0.6 1.18 2.36 4.75 8.0 9.5 Passing rate 9 18 20 22 23 28 36 90 100

[0067] Asphalt: rubber-modified asphalt, 5.4wt%, wherein rubber accounts for 17.9wt% of the total mass of modified asphalt, and the base asphalt is grade A 70# road petroleum asphalt;

[0068] Lignin fiber: 0.3wt%;

[0069] Warm mixing additive: Sasobit warm mixing agent, 1.6wt%;

[0070] Asphalt anti-stripping agent: AR-68 road petroleum asphalt anti-stripping agent, 0.2wt%;

[0071] Embodiment 1 wear layer performance

[0072] Test items unit Experimental results Immersion Marshall residual stability ％ 92.1 freeze-thaw splitting strength ratio ％ 92.2 dynamic stability times / mm 8085 Standard flying mass loss ％ 3.39 initial ...

Embodiment 2

[0074] Coarse aggregate: 72.4wt% basalt coarse aggregate;

[0075] Fine aggregate: 20.0wt% limestone fine aggregate;

[0076] Grading: Grading 2.

[0077] Grading 2

[0078] mesh size 0.075 0.15 0.3 0.6 1.18 2.36 4.75 8.0 9.5 Passing rate 8 15 17 20 20 22 33 90 100

[0079] Asphalt: rubber-modified asphalt, 5.5wt%, wherein rubber accounts for 18.1wt% of the total mass of modified asphalt, and the base asphalt is grade A 70# road petroleum asphalt;

[0080] Lignin fiber: 0.3wt%;

[0081] Warm mixing additive: Sasobit warm mixing agent, 1.6wt%;

[0082] Asphalt anti-stripping agent: AR-68 road petroleum asphalt anti-stripping agent, 0.2wt%.

[0083] Embodiment 2 wearing layer performance

[0084] Test items unit Experimental results Immersion Marshall residual stability ％ 92.4 freeze-thaw splitting strength ratio ％ 92.64 dynamic stability times / mm 8517 Standard flying mass loss ％ 3.02 init...

Embodiment 3

[0086] Coarse aggregate: 69.49wt% basalt coarse aggregate;

[0087] Fine aggregate: 22.9wt% limestone fine aggregate;

[0088] Grading: Grading 3.

[0089] Grading 3

[0090] mesh size 0.075 0.15 0.3 0.6 1.18 2.36 4.75 9.5 Passing rate 6 11 15 22.5 31 44 60 100

[0091] Asphalt: rubber-modified asphalt, 5.51wt%, wherein rubber accounts for 18.5wt% of the total mass of modified asphalt, and base asphalt is grade A 70# road petroleum asphalt;

[0092] Lignin fiber: 0.3wt%;

[0093] Warm mixing additive: Sasobit warm mixing agent, 1.6wt%;

[0094] Asphalt anti-stripping agent: AR-68 road petroleum asphalt anti-stripping agent, 0.2wt%.

[0095] Embodiment 3 wearing layer performance

[0096]

[0097]

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Abstract

An ultra-thin wearing layer of dense skeleton rubber asphalt, which consists of aggregates, rubber modified asphalt, anti-stripping agent, warm mixing agent and lignin fiber, and the paving thickness is 10-20mm. The gradation type of the aggregate is a dense skeleton type, and the maximum nominal particle size is 9.5mm. The rubber-modified asphalt is prepared by adding 70-mesh waste rubber tire powder accounting for 17.5%-18.8% of the total mass of rubber-modified asphalt to A-grade 70# road petroleum asphalt, and heating and stirring to swell. By adding a warm mix agent to reduce the mixing and construction temperature, the rubber-modified asphalt ultra-thin wear layer has good road performance, and it is also energy-saving and environmentally friendly. The ultra-thin wear layer has the advantages of high anti-skid performance and durability.

Description

technical field [0001] The invention belongs to the technical field of building materials used in road engineering, and in particular relates to a skeleton-dense rubber asphalt ultra-thin wearing layer and a preparation method thereof. Background technique [0002] With the rapid development of my country's national economy, the large-scale construction of highways and urban roads, the significant increase of heavy vehicles, and the high speed of driving have put forward higher requirements for the wear resistance and safety performance of the road surface. The traditional pavement wear layer uses a large amount of SBS modified asphalt mixture to enhance the anti-skid performance of the pavement, but the modified asphalt wear layer mixed with SBS will increase the overall cost of the project while improving the performance of the pavement. It is clear to find a cheaper asphalt modified material to replace SBS to reduce the project cost. Compared with the traditional hot mix...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26C04B111/20
CPCC04B26/26C04B2111/00362C04B2111/0075C04B2111/2038C04B2201/10C04B2201/20C04B2201/50C04B14/14C04B14/28C04B18/22C04B18/26C04B2103/0068
Inventor 刘宏富王子昂杨晨熙黄云涌黄拓杨新宇郭腾杨毅
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY