Bond quality assessment method for new-old interface in building restoration

Abstract

The invention discloses a bond quality assessment method for new-old interface in building restoration. According to the invention, a novel restricting test piece is formed in the way that holes in a certain shape are formed on a basis material in a certain shape, then new pouring material is poured in the holes as required, and the bond quality of the new-old interface can be assessed through the performance indexes of the bond interface. According to the method, the test piece plays the role of restricting the new pouring material, so that the effects of the expansion and contraction of the new pouring material on the bond quality of the interface can be reflected. Therefore, due to the adoption of the method, the result is more similar to the practical restricted condition of the new pouring material.

Description

technical field [0001] The invention relates to an evaluation method for the interface bonding quality of new and old materials, in particular to an evaluation method for the interface bonding quality of new and old materials in concrete repair projects. [0002] Background technique [0003] The research and evaluation methods on the repair performance of structures at home and abroad are largely based on the bonding quality of the old and new concrete interface, and the bond strength is an important index that directly reflects the bonding quality of the interface. At present, various methods for evaluating the interface bond strength only focus on the different stress conditions of the bonded interface. According to the different force conditions of the bonded interface, the bond strength can be divided into: shear, tension, tension (compression)- There are three types of shearing, mainly: Z-type shearing type, oblique shearing type, direct tension type at both ends, spl...

AI Technical Summary

Problems solved by technology

In the early stage, when the volume stability of the repair material itself is poor, especially the repair material has obvious shrinkage, due to the restraint of the old matrix, the bonding interface will crack, the bonding force will decrease or even lose the bonding ability, and the repair will fail; after hardening Under the action of various environmental factors (such as load, temperature, humidity, etc.), the repair material and the old concrete structure will produce volume deformation. When the joint deformation of the repair material and the old concrete structure is poor, repeated loads, Loads such as temperature and humidity will rapidly deteriorate the interface bonding quality, making the repair invalid

[0005] The above-mentioned commonly used interface bonding quality evaluation methods focus on the different stress conditions of the bonding interface, but do not reflect the impact of the expansion and contraction of repair materials or new concrete on the interface bonding quality, which is difficult to accurately reflect the actual situation of repairing. The evaluation results can only have a certain degree of reference value for how to choose repair materials in practical applications

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