High-toughness epoxy resin grouting material for rapid repair of concrete structure joint

Abstract

The invention relates to a high-toughness epoxy resin grouting material for rapid repair of a concrete structure joint. The high-toughness epoxy resin grouting material is composed of the following raw materials: a component A and a component B, wherein the component A comprises: glycidyl ether epoxy resin, glycidyl ether epoxy resin, softened modified epoxy resin, epoxy-terminated liquid nitrilebutadiene rubber and a reactive diluent; and the component B comprises: a modified amine curing agent, polymercaptan, a tertiary amine accelerator, amino-terminated liquid nitrile butadiene rubber, anorganic silicon defoamer and an anti-aging agent, and the mass ratio of the component A to the component B is 1:0.2-1. The epoxy resin grouting material has low viscosity, is convenient for groutingconstruction, has good applicability to a humid basal plane, and has fast hardening speed, high early mechanical strength and bonding strength, excellent flexibility, and excellent damp-heat aging resistance and fatigue resistance, and can achieve rapid repair and reinforcement on a concrete structure joint without affecting normal traffic.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a high-toughness epoxy resin grouting material used for rapid repair of concrete structure joints. Background technique [0002] Plate girders have the advantages of simple structure, quick installation, and low cost, so they are widely used in small-span bridges in my country. For the simply supported hinged plate girder structure, the hinge joint is the medium to realize the lateral connection between the plate girders. Once the hinge joint is damaged, the lateral distribution of the bridge and the overall mechanical performance will be seriously affected, resulting in excessive deflection of the plate girder, Cracking of the bottom of the slab and damage to the pavement of the bridge deck; in addition, the seepage of rainwater will cause corrosion of steel bars in the slab girder, corrosion of concrete, and reduction of strength, which pose serious hidden dangers ...

AI Technical Summary

Problems solved by technology

However, the extremely short curing period is achieved by gradually accumulating heat through gradual polymerization to promote the addition polymerization reaction. The fast reactivity of the epoxy adhesive in this system is significantly affected by temperature. When the temperature is low and the gradual polymerization speed slows down, the hardening time of the material will decrease. Significantly extended, it is difficult to meet the requirements of uninterrupted traffic repair and reinforcement of plate girder hinge joints

Moreover, the epoxy adhesive is only toughened by introducing liquid fixation rubber, and the toughening effect is limited. The liquid nitrile rubber itself has a high viscosity, so it should not be mixed too much. The material is prone to degumming under long-term complex fatigue loads. question

At the same time, non-active diluents are used in the viscosity reduction measures, which are prone to problems such as precipitation under long-term loading, which will affect the performance of the material

In addition, thixotropy reduces the fluidity of polyurethane adhesives. When pouring glue into joints, the material poured in the front will gather, thixotropy, and flow will slow down. The gradual reaction speed will increase rapidly, and the materials will harden in a very short time, resulting in seams Blockage of the inner flow channel, which prevents full perfusion, especially in summer when the temperature is high

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