Compression type concrete uniaxial tensile test fixture and test method

Abstract

The invention discloses a compression type concrete uniaxial tensile test fixture and a test method. The compression type concrete uniaxial tensile test fixture comprises a lower pressing piece and anupper jacking piece, the upper end of the lower pressing piece is fixedly connected with an upper pressing plate of the hydraulic machine, and the lower end of the lower pressing piece is slidably inserted into the upper ejecting piece which is arranged on a workbench of the hydraulic machine. The concrete test piece is arranged between the lower pressing piece and the upper jacking piece, the upper end of the concrete test piece is in tight contact connection with the upper end surface of the upper jacking piece, and the lower end of the concrete test piece is in tight contact connection with the lower end surface of the lower pressing piece; according to the invention, the upper clamping end of the concrete test piece is in close contact with the upper end surface of the upper jacking piece; the lower clamping end of the concrete test piece is in contact with the lower end surface of the lower pressing piece; the stress concentration between the clamp and the concrete test piece iseffectively eliminated, the root of the concrete test piece is prevented from being broken due to damage to the interior of the concrete test piece in the early stage of the test, the tensile fracturesurface of the concrete test piece is ensured to occur in the middle of the concrete test piece, and the accuracy of test results is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of concrete testing, and in particular relates to a compression-type concrete uniaxial tensile test fixture and a testing 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. 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 are the most clear, 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 materia...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems existing in the prior art, the present invention provides a compression 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. It is easy to cause the concrete root to break or the part in contact with the fixture to have creep damage, resulting in failure of the tensile test or loss of test accuracy

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