Test method for fracture toughness of concrete materials without self-weight influence

Abstract

The present invention relates to a self-weight influence-free concrete material fracture toughness testing method, and belongs to the technical field of physical measurements. The determination method comprises: 1) erecting a test beam on two rolling bearings of the current three-point bending beam test device, and arranging a load measurement device and a strain measurement device on the test beam; 2) measuring the applied maximum load Fmax through the load measurement device, and measuring an initiation fracture load FQ through the strain measurement device; and 3) calculating an unstable toughness and an initiation fracture toughness. With the self-weight influence-free concrete material fracture toughness testing method, influence of the member self-weight on the testing result is eliminated so as to accurately determine the concrete initiation fracture and unstable toughness and meet the initiation fracture and unstable toughness determination requirements of the concrete material (including hydraulic concrete) of the high crack-depth ratio or large size specimen.

Description

technical field [0001] The invention relates to a method for testing the fracture toughness of concrete materials without the influence of self-weight, and belongs to the technical field of physical measurement. Background technique [0002] In the evaluation of the stability of crack propagation in concrete structures and the anti-crack and anti-crack design of concrete buildings, it is necessary to provide concrete fracture toughness parameters. The fracture toughness parameters of concrete include crack initiation toughness and instability toughness. [0003] Determination of the fracture toughness of concrete materials can refer to the provisions of the Electric Power Industry Standard of the People's Republic of China "Hydraulic Concrete Fracture Test Regulations", using the wedge splitting method and the three-point bending beam method for determination, and the tests of the two methods are carried out at the same time. In case of discrepancies in the results, the thr...

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Problems solved by technology

However, after repeated tests, the applicant found that the calculation of crack initiation toughness and instability toughness with reference to the method in the "Hydraulic Concrete Fracture Test Regulations" is not accurate for the small-sized specimens it is applicable to; The determination of the fracture toughness of non-standard concrete members required by large joint-height ratio or large-size specimens is more inaccurate or even impossible to obtain, so it cannot meet the wider test requirements

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