Test piece and method for testing tensile strength of common concrete by utilizing UHPC

Abstract

The invention belongs to the technical field of concrete, particularly relates to a test piece and method for testing the tensile strength of the common concrete by utilizing UHPC, and aims to providethe test piece for measuring the tensile strength of the concrete. The test piece comprises UHPC test piece units and a to-be-tested concrete test piece unit which are connected into one in a cast-in-place manner, the two UHPC test piece units are located at the left side and the right side of the to-be-tested concrete test piece unit respectively, and a steel mesh and an end plate are separatelyarranged in each UHPC test piece unit. The steel mesh is arranged at one side close to the concrete test piece unit to be tested, the end plate is arranged at one side far away from the concrete testpiece unit to be tested, and the steel meshes and the end plates are connected through twisted steels. The UHPC test piece units are poured into one through the UHPC and the twisted steels, and by combining the characteristics of high strength and high toughness of the UHPC, the bond stress with the twisted steels is stronger, the local stress is reduced, the sliding resistance of the steel barsand the UHPC is increased, and the integrity of the twisted steels and the test piece is enhanced.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a test piece and a method for testing the tensile strength of ordinary concrete by using UHPC. Background technique [0002] Concrete strength is an important mechanical performance index of concrete. The test methods for compressive strength are relatively mature. At present, the tensile strength test methods of concrete mainly include flexural tensile test, split tensile test and axial tensile test, splitting test and bending test. It is only an indirect test method of tension, and it is difficult to measure the stress-strain relationship; compared with the bending-tension and split-pull tests, the axial tension method is more accurate to test the tensile strength of concrete, and the tensile properties of the material can be directly obtained without tearing down. . [0003] In the current test methods for measuring the tensile strength of concrete by the Czochralski method,...

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Problems solved by technology

[0002] Concrete strength is an important mechanical performance index of concrete. The test methods for compressive strength are relatively mature. At present, the tensile strength test methods of concrete mainly include bending test, splitting test and axial tensile test, splitting test and bending test. It is only an indirect test method of tension, and it is difficult to measure the stress-strain relationship; compared with bending and splitting tests, the axial tensile method is more accurate in testing the tensile strength of concrete, and can directly obtain the tensile properties of the material without knocking down

[0003] However, in the current test methods for measuring the tensile strength of concrete by the Czochralski method, some concrete specimens with special shapes are more complicated to manufacture, and the requirements for models and formwork removal are also high, and stress concentration is prone to occur in the special-shaped transition zone.

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