Quick cold-patch repair method for asphalt pavement, and application thereof

An asphalt pavement and repair method technology, applied in the field of road repair materials, can solve the problems of difficulty in meeting high-grade pavements to be opened to traffic as soon as possible, low initial strength of cold patched asphalt mixture, and long time required for strength growth, achieving strong adjustability. , The effect of saving equipment investment and saving materials

Inactive Publication Date: 2014-02-12
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cold-patch asphalt mixtures developed at home and abroad generally have problems such as low initial strength, slow strength growth, and high temperature sensitivity.
When repairing the pavement, because the solvent in the cold-patch asphalt mixture is completely volatilized before reaching a higher strength, the initial strength of the cold-patch asphalt mixture is low, which leads to a long time for its strength growth, and it is difficult to meet the high strength requirements. High-grade road surface is required to be opened to traffic as soon as possible; the strength of the repaired road surface is low, and the ability to resist water damage is poor, thus reducing the traffic capacity of the repaired road and shortening the service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The magnesium phosphate cement used is prepared from magnesium oxide, diammonium hydrogen phosphate, and borax according to the ratio of 1:0.2:0.05. The relationship between the molar amounts of diammonium hydrogen phosphate, borax and magnesia should be represented by the molar ratio of borax to magnesia, potassium dihydrogen phosphate and magnesia, namely B / M and P / M.

[0028] 30 parts of newly prepared magnesium phosphate cement; in addition, 10 parts of fine sand, 5 parts of medium sand, 10 parts of crushed stone with a particle size of 5-20 mm, 4 parts of water-soluble polyurethane, 3 parts of rubber powder, and 0 parts of air-entraining agent.

[0029] The technical indicators of the asphalt pavement cold-patch quick-repair material provided by the invention: 24-hour compressive strength of 32.5 MPa, 24-hour flexural strength of 5.8 MPa, and initial setting time of 11.5 minutes.

Embodiment 2

[0031] The magnesium phosphate cement used is prepared from magnesium oxide, diammonium hydrogen phosphate, and borax according to the material ratio of 1:0.2:0.06.

[0032] 50 parts of newly prepared magnesium phosphate cement; in addition, 15 parts of fine sand, 10 parts of medium sand, 15 parts of crushed stone with a particle size of 5-20 mm, 5 parts of water-soluble polyurethane, 6 parts of rubber powder, and 0.3 parts of air-entraining agent.

[0033] The technical indicators of the asphalt pavement cold-patch quick repair material provided by the invention: 24-hour compressive strength of 30.5 MPa, 24-hour flexural strength of 5.6 MPa, and initial setting time of 12 minutes.

Embodiment 3

[0035] The magnesium phosphate cement used is prepared from magnesium oxide, diammonium hydrogen phosphate and borax according to the ratio of 1:0.25:0.05.

[0036] 30 parts of newly prepared magnesium phosphate cement; in addition, 10 parts of fine sand, 5 parts of medium sand, 10 parts of crushed stone with a particle size of 5-20 mm, 4 parts of emulsified asphalt, 3 parts of rubber powder, and 0 parts of air-entraining agent.

[0037] The technical indicators of the asphalt pavement cold-patch quick repair material provided by the invention: 24-hour compressive strength 31.4 MPa, 24-hour flexural strength 5.5 MPa, initial setting time 13.5 min.

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Abstract

The invention discloses a quick cold-patch repair material for an asphalt pavement, and application thereof. The material is prepared from the following components in parts by weight: 20-80 parts of magnesium phosphate cement, 5-20 parts of fine sand, 0-20 parts of medium sand, 0-50 parts of rubble with the grain size of 5-20 mm, 0-10 parts of emulsified asphalt, 0-10 parts of water-soluble polyurethane, 0-10 parts of rubber powder and 0-1 part of air entraining agent. The materials in parts by weight are uniformly stirred (1.5-2 min) in a stirrer and then poured in a damaged part of the cleared asphalt pavement, thereafter the damaged part is plastered, shaped and repaired, and then the asphalt pavement can be opened for traffic after 2-3 hours of maintenance. The quick cold-patch repair material disclosed by the invention adopts blending and pouring for molding in practical application, no heating is needed, the construction is convenient, the maintenance time is short, small influence is caused to traffic, and the mechanical property and the durability both satisfy the application requirement, so the quick cold-patch repair material is especially suitable for quick repair of pothole and crack-type damages of the asphalt pavement. The quick cold-patch repair material disclosed by the invention not only has a remarkable effect on damage repair aspect of the asphalt pavement but also can expand the application thereof to the field of cement concrete engineering and fields of damage repair of house buildings and old buildings, and the like.

Description

[0001] technical field [0002] The invention relates to the technical field of road patching materials, in particular to a novel rapid cold patching material for asphalt pavement, and a method for repairing asphalt pavement with the patching material and its application. Background technique [0003] Asphalt pavement has become the most common pavement form in the world due to its advantages of comfortable driving, low noise and easy maintenance and repair. However, after opening to traffic, due to traffic loads, climate conditions, and deficiencies in the design and construction process, cracks, potholes, ruts and other road surface defects will appear on the asphalt pavement, which will seriously affect the driving comfort and even cause the structural bearing capacity to gradually decrease. problem of loss. [0004] At present, hot mix asphalt mixture is the mainstream material for repairing damaged asphalt pavement. However, when hot-mix asphalt mixture is used to rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34E01C23/14
Inventor 李九苏徐国栋陈永真张文勃叶康
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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