Bond strength testing method of concrete rough aggregate interface

Abstract

The invention discloses a bond strength testing method of a concrete rough aggregate interface, comprising the following steps: (1) selecting large-particle-size rough aggregate and ingredients; (2) filling concrete mixture into a forming mold by a half of the height, and fixing the large-particle-size rough aggregate bonding interface on the mixture filled with the concrete mixture; (3) casting mortar, then carrying out vibration, curing till initial setting, and then demolding; (4) curing a whole test piece; (5) drilling the test piece; and (6) testing the testing piece. The bond strength testing method has reasonable design, simple and convenient operation, convenient implementation, good use effect and accurate testing result, the difference between the rough aggregate interface in the manufactured testing piece and the rough aggregate interface in in-situ concrete is very little, and the adopted bending strength loading device can realize single-point contact type loading to the tested testing piece; in addition, the bond strength testing method can really and effectively carry out accurate test on the bonding strength of the rough aggregate in the in-situ concrete, and effectively solve the defects and shortages that in the existing testing method, the testing result is not accurate, the operation complete and the like.

Description

technical field [0001] The invention belongs to the technical field of testing the interface bond strength of concrete aggregates, in particular to a method for testing the interface bond strength of concrete coarse aggregates. Background technique [0002] There is a weak strength transition zone at the interface of concrete coarse aggregate, and the interface transition zone has a relatively loose structure and low strength, which is the key research content of mesomechanics. The mesostructure study shows that the interfacial transition zone is the weak link in the mechanical properties of concrete. The interfacial bond strength directly affects the mechanical properties of concrete, especially the tensile strength, which is an important parameter in the numerical analysis of concrete mesomechanics. [0003] At present, the test methods for the mechanical strength of the transition zone of the concrete coarse aggregate interface mainly include the microhardness method and...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for testing the bond strength of concrete coarse aggregate interface, which is reasonable in design, easy to operate, convenient to implement, good in use effect, accurate in test results, and capable of Effectively solve the defects and deficiencies in the existing test methods such as the large difference between the specimen and the coarse aggregate interface in the field concrete, inaccurate test results, and complicated operations

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