Sticking type dumbbell-shaped test piece mold for testing concrete axial tensile performance and test method

Abstract

The invention relates to a mold for a laboratory, in particular to a dumbbell-shaped mold for testing concrete axial tensile performance tests and a corresponding test method. A concrete axial tensiletest mold comprises a bottom plate and four side plates, wherein the bottom plate and the side plates form a vertical box body with an open top end and a hollow inside; the front and back side platesare respectively provided with six through holes; the front and back side plates are connected and fixed through threaded screw bolts; two screw bolts at the bottom pass through preserved holes of bottom plate fixing blocks, so that the side plates and the bottom plate are connected; the front and back side plates and the bottom plate are provided with fixing blocks for limiting the left and right side plates; four side plates are subjected to circular arc transition into a dumbbell-shaped middle vertical region. The test device uses a method of an auxiliary rigid rod; the rigidity of a testmachine is improved; a concrete axial tensile stress-strain descending section is obtained. The mold is simple in installation and operation; the formed test piece is high in precision; the manufacturing is efficient and concise; the expected effect of the test is high; the concrete axial tensile stress-strain full curve can be accurately tested.

Description

technical field [0001] The invention relates to a test mould, in particular to a dumbbell-shaped tensile specimen mold for measuring the axial tensile performance of concrete by using a sticking clamping method, and a test method and a test loading device using the mold. Background technique [0002] Axial tension is the most direct, objective and effective test method for testing the tensile properties of concrete, which can truly reflect the tensile strength of the material and obtain the full uniaxial tensile stress-strain curve. Due to the disadvantages of low tensile strength and high brittleness of concrete materials, and with the application of more and more thin-shell structures such as high arch dams in practical engineering, this problem becomes more obvious. Therefore, a test mold and test method that can accurately test the axial tensile properties of concrete and can be used flexibly in actual tests is particularly important. But at present, there is no ideal t...

AI Technical Summary

Problems solved by technology

Among them, the external clamping type test mold is more complicated, and the requirements for the specimen are higher, and the external clamping type is prone to stress concentration at the clamping end and surface damage caused by clamping; the pre-embedded type has stress concentration and eccentricity problems at the end

The paste type can overcome the problems of stress concentration and clamping damage, can obtain a more uniform stress distribution, and has a high test success rate, which has unique advantages. The test device is more difficult, and there are more data about the rising end of the curve, but there are few descending sections. Second, due to the high rigidity requirements of the testing machine for the concrete axial tension test, the test method is complicated, and the test process is affected by the test conditions and specimens. Molding technology has a big impact

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