Method for manufacturing and testing pre-embedded screw type steel fiber reinforced concrete uniaxial tensile test piece

Abstract

The invention provides a manufacturing and testing method for a pre-embedded screw type steel fiber reinforced concrete uniaxial tensile test piece. The mold is composed of a cuboid wood mold, a foam piece, an embedded screw and a screw positioning base plate. The foam piece is attached to the wood mold side plate after being processed into a specified shape, so that the transition between the end part of the tensile test piece and the middle test section is realized. The screw positioning base plate is connected with the wood mold end plate, the hole corresponds to the embedded screw in size and position and is used for embedding the screw during pouring, and the exposed length of the embedded screw of the test piece is controlled by adjusting the total thickness of the two plates. The step of manufacturing the test piece comprises pouring and demolding. The test method comprises the steps of tensile test preparation and test flow. The tensile test piece mold provided by the invention can conveniently realize the forming of a tensile test piece in a special shape and the positioning and embedding of screws, is economical, flexible and high in operability, is easily processed into a multi-connected mold, and can conveniently realize the test of the direct tensile property of the steel fiber reinforced concrete by combining with the test method.

Description

technical field [0001] The application relates to the field of mechanical performance testing of steel fiber concrete materials, in particular to a pre-embedded screw-type steel fiber concrete uniaxial tension test piece multi-joint wooden formwork and a test piece manufacturing and testing method. Background technique [0002] Tensile property is a very important mechanical property of steel fiber reinforced concrete, and the most direct and effective method to study it is uniaxial tensile test. The choice of tensile specimen shape and tensile method greatly affects the difficulty and effect of the test. In order to make the cracking and failure mainly occur in the middle test section, the uniaxial tensile test mostly uses "dog bone" specimens, and the transition between the large section end and the middle small section test section is through a smooth arc surface or an inclined surface. , and if necessary, a small gap can be set in the middle of the test section. Such s...

AI Technical Summary

Problems solved by technology

Traditional steel molds have high precision and can be reused, but specific shapes need to be customized and are expensive; traditional wooden molds are economical and easy to operate, and are mostly used for forming cuboid test pieces, and special shapes are difficult to process

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