Test method for anti-permeability performance of fluid sealant and concrete bonding sample interface

Abstract

The invention discloses a method for testing interface impervious strength of the sample bonded by sealant and concrete. The method comprises: reserving a seam cavity of a certain size in the middle of the concrete bonded sample, filling in sealant to bond the concrete and the sealant into an integral body to obtain a truncated cone shaped bonded impervious sample; placing the bonded impervious sample on the permeability instrument; increasing the water pressure of the impervious instrument at regular intervals for 0.1MPa each time from 0.1MPa until water seeps from the sample surface; and determining the previous water pressure as the impervious strength of the interface of concrete and sealant. The invention achieves the advantages of simple operation, unique and convenient using, need not adding other equipments, is convenient for popularization; it can detect the impervious strength of any composite material structure, has good instructiveness to engineering practice, is especially suitable for detecting the impervious strength of concrete construction seam and expansion joint such as simulated reservoir dam surface, channel expansion joint, aqueduct expansion joint and pipeline expansion joint, achieves great practical engineering value.

Description

technical field [0001] The invention belongs to the field of performance testing of building materials, in particular to a method for testing the interface impermeability of a sealant and a concrete bonding sample. Background technique [0002] At present, the method of testing the impermeability of concrete is very mature. At the same time, the sealant as an anti-seepage sealing material does not need to be tested for its impermeability because of its high impermeability level. However, when the sealant is used as a caulking or joint material in concrete construction joints or expansion joints, the bonding interface is often the weakest part of the impermeability. The bonding surface is composed of inorganic materials and polymer materials. First of all, the porosity, void type, roughness of the concrete surface, and the type, ratio, and viscosity of the polymer sealant all affect the bond strength; in addition, the cleanliness, roughness, dry humidity, and application of ...

AI Technical Summary

Problems solved by technology

Poorly treated joints become channels for water seepage, directly or indirectly destroying the concrete structure or the foundation of the project, causing foundation subsidence, causing the weight of the project to drop or to be wrong, and finally destroying the entire project, resulting in huge economic losses. bad social influence

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