A concrete uniaxial tensile test fixture and test method

Abstract

The invention provides a concrete uniaxial tensile test fixture and test method, which include two clamp bodies with the same structure, the two clamp bodies are respectively arranged at the two ends of the concrete test piece, and there is a gap between the clamp body and the concrete test piece The specimen clamping part is horizontally embedded in the clamp body; the specimen clamping part is provided with a specimen installation groove, and the clamping end of the concrete specimen is fitted in the specimen installation groove; the concrete specimen The clamping end of the specimen is in close contact with the mounting groove surface of the test piece, and the two sides of the clamping end of the concrete specimen are in contact with the surface of the clamping body; in the present invention, the clamping end of the specimen is in contact with the mounting groove surface of the specimen Close fit, using the geometric constraints of the clamp body and the specimen clamping piece, to achieve the clamping and fixing of the specimen, avoiding the local stress concentration at the clamping end of the concrete specimen, and reducing the occurrence of cracks and slowing at the clamping end of the specimen. Variable and other additional damage ensures that the tensile fracture surface occurs in the middle of the specimen, improving the reliability and stability of the test process.

Description

technical field [0001] The invention belongs to the technical field of concrete tests, and in particular relates to a concrete uniaxial tension test fixture and a test method. Background technique [0002] Concrete is currently the most widely used material in construction projects, and the strength of concrete components needs to be tested by means of experiments; tensile properties are important mechanical properties of concrete materials, and their tensile strength can be obtained by uniaxial tensile tests. [0003] At present, there are three main test methods for the tensile performance of concrete: split tension test, straight tension test and bending tension test; among them, the test data measured by the straight tension test is the most accurate and can most directly reflect the tensile strength and strain changes of concrete. Thus, the stress-strain relationship of the concrete material can be obtained; however, due to the natural brittleness of the concrete materi...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems existing in the prior art, the present invention provides a concrete uniaxial tensile test fixture and its test method, in order to solve the non-negligible gap between the concrete specimen and the fixture in the existing concrete uniaxial tensile test. The stress concentration in the concrete can easily cause the root of the concrete specimen to break or the part in contact with the fixture to have creep damage, resulting in the failure of the concrete uniaxial tensile test or the loss of test accuracy.

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