Interface shearing strength test method for adhesive bonding sample of sealant and substrate

Abstract

The invention discloses a testing method of the shearing resistance between a sealing gum and a stuck sample interface of a stuck base material, which manufactures the stuck base material into two samples, and a cavity with specified size is reserved in the middle for injecting the sealing gum, thus integrating the stuck base material and the sealing gum into a whole stuck sample which is placed in the environment with the temperature of 20 DEG C minus or plus 2 DEG C and the relative humidity of 65 percent minus or plus 5 percent for being conserved for 28 days, and the samples are respectively placed into an upper shearing box and a lower shearing box, positive pressure P1 is exerted on an upper part, and horizontal force P2 is exerted simultaneously. The shearing force exerted on the samples is measured by a dynamic meter 5. The shearing force P2 is exerted with specified loading rate, and until a shearing surface between the stuck base material and the sealing gum is destroyed, and the largest force measured by the dynamic meter 5 is the shearing resistant force. The value obtained by dividing the shearing resistant force by the area of the stuck sample interface is the shearing resistance between the bonding interfaces of the stuck base material and the sealing gum under the positive pressure P1. The testing method of the shearing resistance between the sealing gum and the stuck sample interface of the stuck base material has simple operation, convenient use and favorable popularization, has no need of new additional equipments, and has strong guidance to specific industrial practices.

Description

technical field [0001] The invention belongs to the field of performance testing of building materials, and particularly relates to a method for testing the shear strength of the interface between a sealant and an adhered substrate bonding sample. Background technique [0002] At present, methods for testing the shear resistance of single materials such as concrete are well established. However, the method to test the shear strength of the composite bonding surface by simulating the actual engineering situation has not been reported yet. When sealant is used as caulking or joint material in concrete construction joints or expansion joints, the bonding interface is often the weakest part of impermeability. Since the bonding surface is composed of two materials, first of all, the porosity, porosity, roughness of the surface of the substrate to be bonded, and the type, proportion and viscosity of the polymer sealant all affect the shear strength. In addition, the cleanliness,...

AI Technical Summary

Problems solved by technology

For water conservancy projects, when foundation subsidence, structure settlement, etc. occur, the interface between the sealant and the bonded interface is subject to shear force, and when the shear force exceeds the shear strength, the joint interface will be destroyed, which directly affects the quality of the project. Severe cases will cause huge economic losses and produce bad social impact

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