Cement-based material anti-cracking performance quick testing device with round outside and square inside

Abstract

The invention discloses a cement-based material anti-cracking performance quick testing device with a round outside and a square inside. The device comprises a stepped bottom plate, an annular outer formwork and a square inner steel die are concentrically arranged on the stepped bottom plate from outside to inside, an induced cracking component is fixedly arranged on the peripheral wall of the square inner steel die and comprises two annular ribbed rebars, and the annular ribbed rebars are parallelly fixed on the peripheral wall of the square inner steel die. The device is simple in structure,convenient to operate and can accelerate forming of a first crack so as to shorten testing period, timeliness of the device is improved, test piece cracking position can be determined, and accuracy of the device is improved; the problem that existing circular anti-cracking devices are generally long in testing period, random in cracking position and difficult in observing cracks is solved.

Description

technical field [0001] The invention relates to performance testing of building materials, in particular to a rapid testing device for crack resistance of cement-based materials. Background technique [0002] Concrete material has become one of the most commonly used building materials in construction projects and many water conservancy and hydropower projects in the world today because of its good plasticity and integrity, strong fire resistance and waterproof performance, easy material acquisition, and excellent economic benefits. However, the tensile strength of concrete is only 1 / 17~1 / 8 of the compressive strength, which leads to easy cracking of concrete. Once concrete cracks occur, it will lead to the loss of structural integrity, which will not only cause the steel bars in the concrete structure to corrode in advance, reduce the durability of the structure, but also may cause structural cracks to directly reduce the bearing capacity of the structure. Therefore, estab...

AI Technical Summary

Problems solved by technology

However, it has problems such as long test period and uncertain cracking position, which makes it difficult to observe cracks, which affects its popularization and use.

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