Square Pyramid Concrete Tensile Specimen Fixture

Abstract

The present invention mainly relates to a clamp for a quadrangular pyramid-shaped concrete tensile test piece, which includes an end clamping rod fixed at one end to a tensile testing machine, and the other end of the clamping rod at the end is fixed to the end plate of the clamp through a clamping rod fixing nut; on the end plate of the clamp There are end plate reinforcement ribs on the top; the end plate of the fixture is square, and each side is movably connected with a loose-leaf buckle plate through a hinge that can be opened and closed freely. Four loose-leaf buckle plates of the same size clamp and fix the concrete specimen from four sides. Two ends; after clamping the test piece, the adjacent loose-leaf gussets are fixed through the gusset fixing jacks and the steel bar inserts inserted into the gusset fixing jacks. The invention has the advantages of simple structure and convenient use, realizes the direct test of the axial tensile strength index of the concrete specimen, and makes the test of the index direct and accurate.

Description

technical field [0001] The invention belongs to the testing field of the axial tensile strength index of concrete, and relates to a concrete tensile test piece fixture, in particular to the centering fastening of the end of the concrete axial tensile test piece and the implementation of the tensile strength index of the test piece Fixtures for direct testing. Background technique [0002] At present, there are mainly two methods for testing the axial tensile strength index of concrete, one is the direct test method of the pre-embedded steel bars at the end of the specimen, and the other is the indirect test method of the split test. Direct test method: A 100mm×100mm×500mm prism specimen cast with a steel mold passes through the steel bars pre-embedded at both ends of the specimen axis to apply tension to the specimen, and the average tensile stress when the specimen is destroyed is the axis of the concrete. Central tensile strength; the split test is an indirect test method...

AI Technical Summary

Problems solved by technology

The test data measured by the split test has a large randomness, and the conversion formula is also an empirical formula. Although the split test is a commonly used test method to obtain the tensile properties of concrete materials, its reliability and accuracy need to be determined. Further improve and enhance

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