High-temperature-resistant epoxy structure adhesive for bridge segment splicing

Abstract

The invention discloses a high-temperature-resistant epoxy structure adhesive for bridge segment splicing. The epoxy structure adhesive comprises a component A and a component B, wherein the ratio ofthe component A to the component B is 3:1. The operating temperature of the epoxy structure adhesive is up to a high temperature of 120 DEG C, namely the operating temperature ranges from minus 45 DEGC to 120 DEG C after curing. Furthermore, the epoxy structure adhesive has good thixotropy, meets construction process performance requirements of the structure adhesive for operating time, also meets mechanical property requirements for early strength, can meet high-temperature-resistant operating requirements, and can be widely applied to splicing of bridges built by a precast segmental matching method aiming at operating requirements of regions for high-temperature resistance. The high-temperature-resistant epoxy structure adhesive is feasible through proving of experiments, simulation andusage, results are good, and no abnormal phenomenon exists.

Description

technical field [0001] The invention relates to the field of epoxy structural adhesives, in particular to an epoxy structural adhesive for high temperature resistant bridge segment splicing. Background technique [0002] At present, domestic bridge construction is developing in the direction of prefabrication, factoryization and large-scale. The construction of bridges using the prefabricated segment matching method is a construction method that is vigorously promoted in bridge construction at present. This construction method has the advantages of fast construction speed, small construction area, small shrinkage and creep of box girder concrete, and small change in beam body alignment after completion. advantage. [0003] According to the different assembly methods between bridge segments, the segmental prefabricated bridge assembly method can be divided into three assembly methods: dry joint, wet joint and adhesive joint. Among them, due to the serious defects in the ove...

AI Technical Summary

Problems solved by technology

At present, the general use temperature of such adhesives on the market is -45 ~ 60°C, which belongs to the adhesive used at conventional temperatures, and the durability also follows the requirements of the design service life of building structural adhesives for 50 years, while the general design service life of bridges is 100 years, and in some hot places in the south, the road surface that has been exposed to high temperature in summer will have a high temperature of more than 60°C for a long period of time, so it exceeds the normal operating temperature of general structural adhesives, resulting in a decline in its performance, which in turn affects its durability. , cannot meet the service requirements of the 100-year design life