A test piece and method for testing the tensile strength of ordinary concrete by uhpc

Abstract

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, and aims to provide a test piece for measuring the tensile strength of concrete. The specimen includes a UHPC specimen unit and a concrete specimen unit to be tested which are connected as a whole. The two UHPC specimen units are respectively located on the left and right sides of the concrete specimen unit to be tested; The mesh and the end plate, the steel mesh is arranged on the side close to the concrete specimen unit to be tested, and the end plate is arranged on the side away from the concrete specimen unit to be tested; the steel mesh and the end plate are connected by threaded steel bars. The UHPC specimen unit adopts UHPC and threaded steel pouring as a whole, combined with the characteristics of UHPC's high strength and high toughness, the gripping force with the threaded steel bar is stronger, the local stress is reduced, the sliding resistance between the steel bar and UHPC is increased, and the strength is enhanced. The integrity of the threaded steel bar and the test piece is ensured.

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, but the current test methods for tensile strength 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 ...

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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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