Concrete restrained contraction ring crack resistance test device and test method

Abstract

The invention discloses a concrete restrained contraction ring crack resistance test device and a test method. The device comprises a restrained contraction ring component, automatic maintenance equipment and an intelligent test and control system; the restrained contraction ring component comprises a bottom plate, a restrained contraction ring and an outer mould; an anti-arc mould is arranged on the inside surface of the outer mould; the automatic maintenance equipment comprises a maintenance box and a temperature / humidity automatic adjustment system; the maintenance box is formed by a first box body which is used for placing a concrete testing piece, and a second box body which is used for placing the temperature / humidity automatic adjustment system; and the intelligent test and control system comprises a plurality of micro strain sensors, a signal conditioning circuit module, a microprocessor and a computer. The method comprises the steps of: 1. forming, 2. maintaining, 3. assembling the crack resistance test device, and 4. carrying out a concrete testing piece crack resistance test in two different temperature / humidity change conditions. The concrete restrained contraction ring crack resistance test device is reasonable in design, convenient to use and operation, high in test precision and high in reliability, has the advantage of relatively scientifically evaluating the crack resistance of concrete and has high popularization and application values.

Description

technical field [0001] The invention relates to the technical field of concrete anti-crack performance testing, in particular to an anti-crack test device and a test method of a concrete constrained shrinkage ring. Background technique [0002] Concrete cracking is a key factor affecting the durability of concrete, and has a very important impact on the service life of concrete structures. Cracking is a common problem in concrete engineering. The traditional test evaluation method can only evaluate the resistance of concrete by single factor test results such as compressive strength, tensile strength, elastic modulus, ultimate tensile value, drying shrinkage, creep, and adiabatic temperature rise. Crack performance, crack resistance performance calculation formula is various, it is difficult to accurately evaluate the crack resistance performance of concrete. Therefore, it is of practical significance to study the evaluation method of concrete crack resistance. [0003] In...

AI Technical Summary

Problems solved by technology

When it was changed to concrete, two types of problems appeared. One is the divergence of concrete cracks. Concrete cracks do not appear in one place, but in many places, especially for hydraulic concrete with a low amount of cementitious materials, and even unsatisfactory cracks may occur. cracking situation

The second is the problem of capturing the cracking time. Sometimes the concrete is cracked, which cannot be reflected on the automatic monitoring instrument

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