Fiber-reinforced concrete uniaxial tensile performance test specimen and its test method

Abstract

The invention provides a test piece for testing the uniaxial tensile property of fiber reinforced concrete and a test method thereof. The test piece is bone-shaped, and comprises clamping sections attwo ends, a middle test section and a force transmitting section, wherein the clamping sections are in a streamline form. The test method comprises test piece forming, demoulding, tensile test preparation and experimental data recording, wherein the test piece is poured in a molding cavity defined by two side plates, two end part clamping molds and a bottom forming template, during demoulding, thetest piece is taken down together with the clamping molds, and the clamping molds are connected with the testing equipment. According to the testing method provided by the invention, the clamping molds and the test piece integrally formed, the test piece and a clamping fixture are good in contact embedding degree, a stress concentration phenomenon is not easy to occur, force transmission is uniform, and the test piece can be directly installed on test equipment to be quickly and effectively tested; the test piece is bone-shaped, the sections thereof are in smooth transition, uniform stress and force transmission are achieved, fracture at a position outside the test section is reduced, and the test success rate is high.

Description

technical field [0001] The invention belongs to the technical field of concrete performance tests, in particular to a fiber-reinforced concrete uniaxial tensile performance test specimen and a test method thereof. Background technique [0002] Tensile properties are important mechanical properties of various materials, and the tensile properties of materials can be obtained by uniaxial tensile tests. In uniaxial tensile testing, the shape and grip of the specimen are critical to the success and accuracy of the test. Concrete materials, including most fiber-reinforced concrete, are brittle materials, and in uniaxial tensile testing, eventual fracture can easily occur at the clamped ends of the specimen rather than in the middle if the specimen is not properly shaped and clamped. The pre-determined damage section, thus causing the test to be invalid; the common concrete material test specimen installation methods in the prior art include: the pre-embedded method of making spe...

AI Technical Summary

Problems solved by technology

Concrete materials, including most fiber-reinforced concrete, are brittle materials, and in uniaxial tensile testing, eventual fracture can easily occur at the clamped ends of the specimen rather than in the middle if the specimen is not properly shaped and clamped. The pre-determined damage section, thus causing the test to be invalid; the common concrete material test specimen installation methods in the prior art include: the pre-embedded method of making specimens. For heterogeneous concrete materials, the pre-embedded structure often becomes the source of initial internal cracks. The reason is that the success rate of the test is uncertain; the test piece with a hole structure at the end, during the test, the pull hole appears due to the stress concentration caused by the eccentric load, resulting in the fracture surface and the ultimate stress cannot reflect the actual situation of the material; for friction or sticking However, in addition to the brittleness similar to ordinary concrete materials, fiber reinforced concrete materials have a large difference in tensile properties and ductility. The tensile properties of the prior art The size and structure of the test specimen are not the most suitable choice for the tensile test of fiber reinforced concrete materials. The size and structure of the tensile test test specimens in the prior art are not the most suitable choice for the tensile test of fiber reinforced concrete materials. Design A reliable specimen clamping method and corresponding specimen shape that can adapt to fiber-reinforced concrete materials is of great significance to the successful uniaxial tensile performance test of fiber-reinforced concrete

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