Mould for forming axial tensile-strength test piece of cement-based material and test method

Abstract

The invention relates to a mould for forming an axial tensile-strength test piece of cement-based material and a test method, belonging to the field of building materials. The mould comprises a testing machine, a test piece forming mould, a test piece force-transfer device and a data acquisition device, wherein the test piece forming trial mould comprises a bottom plate, two end plates, two lateral plates and two intermediate plates; the two end plates and the two lateral plates are all arranged on the bottom plate, and a cavity is enclosed by the bottom plate, the end plates and the lateral plates; the two intermediate plates are also arranged on the bottom plate in parallel to the lateral plates and positioned in the cavity, and the cavity is divided into three parts by the two intermediate plates, wherein the parts at two sides are used for forming the test piece; bolt rods are embedded in two ends of the test piece, each bolt rod comprises a nail head, a smooth rod and a thread rod, wherein the nail head is embedded into the test piece, the smooth rod passes through the end plates, and thread rod straightly extends out of the end plates; the test piece force-transfer device selectively adopts a universal hinge, and the test piece is connected with the testing machine by the universal hinge; and the data acquisition device is used for acquiring experimental data. The invention can accurately and conveniently measure the axial tensile strength of the cement test piece, and is simple and practical.

Description

technical field [0001] The invention relates to a mold and a testing method for forming a cement-based material axial tensile strength test piece, belonging to the field of building materials. Background technique [0002] Cement-based materials are the largest and most widely used materials in the construction industry. The axial tensile parameter of cement-based material is an important index commonly used in construction engineering to evaluate its performance. However, this material has its own inherent defects: brittleness, easy cracking, and low tensile strength. Therefore, the axial tensile test of cement concrete is not easy to carry out, and there are many problems, such as load eccentricity, uneven stress distribution, etc., which makes the research of axial tensile test start relatively late. At present, there are various indirect methods to obtain the tensile and fracture properties of cement-based concrete, such as split pull method, three-point bending beam m...

AI Technical Summary

Problems solved by technology

But this material has its own inherent defects: brittle, easy to crack, low tensile strength

However, it is difficult to ensure that the stress of each implanted steel bar or screw is uniform and the test piece cannot be coordinated, which may easily cause initial defects or slippage, which will affect the test results, and the construction operation of this method is complicated.

[0008] Through the analysis of the axial tensile strength of the current cement concrete, it is found that all methods have their shortcomings, such as the difficulty in solving the load eccentricity, the difficulty in making the trial form, poor reusability, and complicated construction operations.

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