Concrete uniaxial tensile test fixture and test method

Abstract

The invention discloses a concrete uniaxial tensile test fixture and a test method. The concrete uniaxial tensile test fixture comprises two fixture bodies with the same structure, each fixture body comprises a jaw connecting piece and a test piece clamping piece, one end of each jaw connecting piece is connected with a jaw of a tensile test machine in a matched mode, and the other end is connected with the corresponding test piece clamping piece; the jaw connecting piece is connected with the test piece clamping piece through a mortise and tenon joint; the clamping end of the concrete test piece is embedded into the test piece clamping piece, and the clamping end of the concrete test piece and the test piece clamping piece are connected in a surface contact close fit manner. The clampingend of the concrete test piece is connected with the test piece clamping piece in a surface contact fit manner, so that local stress concentration is effectively eliminated, the damage to the test piece is reduced, the tensile fracture surface of the concrete test piece is ensured to occur in the middle of the test piece, and a positive promoting effect is achieved for improving the test precision; the jaw connecting piece and the test piece clamping piece are connected in a mortise and tenon joint mode, the structural stability is improved, mounting and dismounting are easy, and the tensile test efficiency and the measurement precision are effectively improved.

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 performance is an important mechanical property of concrete materials, and its tensile strength can be obtained by uniaxial tensile test. [0003] At present, there are three main methods for testing the tensile properties of concrete: split tension test, straight tension test and bending tension test. Among them, the test data measured by the direct tensile test is the most accurate, and can most directly reflect the tensile strength and strain changes of concrete, so as to obtain the stress-strain relationship of concrete materials. However, due to the natural brittleness of concrete materials, in unia...

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 test method to solve the non-negligible stress concentration between the concrete specimen and the fixture in the prior art, which is easy to cause concrete The root of the specimen breaks or the creep failure phenomenon occurs in the part in contact with the fixture, which eventually leads to technical problems in the failure of the tensile test

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