Concrete test piece forming die for micro tensile testing and test piece forming method

Abstract

The invention relates to a concrete test piece forming die for micro tensile testing and test piece forming method. The die comprises first side plates, second side plates, a third side plate, a bottom plate and a top plate. The two first side plates are oppositely disposed at the front side and the rear side of the upper surface of the bottom plate; the two second side plates are oppositely arranged at the left and right sides of the upper surface of the bottom plate; the first side plates and the second side plates are movably connected; and the first side plates, the second side plates andthe bottom plate for a die cavity. The third side plate is disposed on upper surfaces of the second side plates and is used for increasing the receiving space of the die cavity. The top plate covers the top of the die cavity movably; and a protruding block is arranged on the surface of the top plate. When the top plate covers the top of the die cavity, the protruding block matches the periphery ofthe die cavity and is used for extruding the concrete grout filling the die cavity. According to the concrete test piece forming die, the flat surface of the formed test piece is ensured; and adaptability to two kinds of test piece shapes and different steel fiber merging methods is high. In addition, the invention also provides a est piece forming method based on the die.

Description

technical field [0001] The invention relates to the technical field of microstructure of concrete test pieces, in particular to a concrete test piece forming mold and a test piece forming method for microscopic tensile tests. Background technique [0002] Most of the research on the performance of UHPC in civil engineering materials stays at the macroscopic mechanical level, while the research on the microscopic mechanism is relatively small. [0003] Using SEM or other microscopic equipment combined with a stretching table can conduct dynamic research on the mechanical properties of UHPC at the microscopic level, which can achieve both qualitative and quantitative results. [0004] At present, the tensile table is mostly used in the in-situ tensile test of metals, and is rarely used in the field of concrete. The main reason is the difficulty in preparing small concrete samples. Due to the brittleness of concrete materials, cutting with machines is easy to break When the te...

AI Technical Summary

Problems solved by technology

In the current method of preparing small steel fiber reinforced concrete specimens, there is a problem that the surface of the test area is not smooth enough, resulting in uncontrollable factors such as stress concentration, which greatly affects the accuracy of the test.

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