Bridge expansion joint fast reparation material

Abstract

The invention relates to a bridge expansion joint fast reparation material which is composed of a component A and a component B. The component A is composed of, by weight, 25-30 parts of fast-hardening sulphoaluminate cement, 5-10 parts of ordinary Portland cement, 1-3 parts of anhydrite, 1-3 parts of silica fume, 55-65 parts of quartz sand, 0.5-1 part of a water reducing agent, 0.5-1 part of boric acid, and 1-3 parts of fiber. The component B is composed of, by weight, 35-45 parts of carboxylic butadiene-styrene latex, 0.5-1 part of lithium salt, 0.5-1 part of a lithium salt defoaming agent, and 55-65 parts of water. The material has the characteristics of high early strength, stably increasing late strength, low elastic modulus, high bonding strength, cracking resistance, and the like. In practical construction, the material is simple to use.

Description

technical field [0001] The invention relates to a super-early-strength flexible concrete material, in particular to a rapid repair material for bridge expansion joints. Background technique [0002] When the concrete on both sides of the bridge expansion joint is impacted, it is easy to produce stress concentration and cause damage. Concrete damage on both sides of expansion joints and bond failure between concrete and steel plates and old concrete are the main forms of expansion joint damage, which will cause further damage such as exposed steel plates in expansion joints, broken steel bars, etc., and eventually lead to the connection between the road surface and the bridge deck If it is not smooth, it will cause early damage and affect traffic operation. [0003] Due to the special effects of expansion joints, their service life is relatively low, and some of them were even damaged in the year they were opened to traffic. Due to the limitation of location and service envi...

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Problems solved by technology

[0004] ⑴Expansion joint maintenance is a maintenance project, which needs to close the traffic, resulting in a decrease in road traffic rate. For expressways, the resulting losses are even more serious

Conventional cement concrete materials have a long maintenance period and need to close the road for a long time

[0005] (2) Expansion joints belong to the joints of roads and bridges, and need to have good bonding with steel plates and old concrete. Secondly, they must withstand load deformation. Therefore, the requirement for expansion joint materials is flexible bonding repair materials, while the current conventional repair materials It is a cement concrete material, which has poor bonding and is easily broken by impact

[0006] Steel fiber concrete and rapid-hardening concrete are the main methods of repairing expansion joints at present, but due to their high modulus, secondary damage is serious. At the same time, the curing time of steel fiber concrete is more than 7 days, which has a great impact on traffic

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