Sealing agent for combined interface of new and old concrete

Abstract

An interface sealing agent for combining new and old concrete applies to bond combining interface of new and old concrete, which comprises silicate mineral powder, pozzolana powder, active powder for reducing contraction, inert particles for reducing contraction, surfactant and retarder. The silicate mineral powder provides bonding strength; the pozzolana powder raises flowability and viscosity of slurry and reduces numbers of calcium hydrate macrocrystalline, and enhances continuously late strength; the active powder for reducing contraction is expansion component; the inert particles can reduce slurry contraction; the surfactant can reduce ratio of water and glue and regulates coagulation time, the technique improves bonding property and sealing property of bond combining interface of new and old concrete, comparing with conventional material and present interface material improved greatly, capable of bonding combining interface of new and old concrete firmly without crack; productshave little toxicity and environment pollution.

Description

New and old concrete bonding interface sealant technical field The present invention relates to a new-old concrete bonding interface sealant used as a bonding material for the bonding interface when fresh concrete is poured on the old concrete of various buildings, so as to improve the bonding strength and sealing performance of the bonding interface between new and old concrete . technical background Under the action of man-made and natural environment, a large number of buildings are degraded and damaged every year, and need to be repaired and reinforced. Many buildings are also facing reinforcement and reinforcement due to environmental conditions, changes in use functions and extension of service life. The problem of remodeling. In the process of repairing, strengthening and transforming concrete structures, the bonding state of new and old concrete is the key to the quality of concrete structures after repairing, strengthening and transforming. There are differences...

AI Technical Summary

Problems solved by technology

The commonly used joint surface bonding materials in engineering mainly include cement slurry, expansion cement slurry, epoxy glue, etc., but the use of such joint surface bonding materials to repair or reinforce new and old concrete has low bond strength, poor erosion resistance, and durability. Poor performance, some bonded surface bonding materials are toxic to people and the environment, will cause harm to human health and pollute the environment

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