Test device and method for axial full restraint stress

Abstract

The invention discloses a test device and method for axial full restraint stress. The test device for axial full restraint stress comprises a restraint frame, a displacement sensing system, a restraint test piece, a load sensor, an actuator and an environmental cabinet. The restraint frame, the displacement sensing system, the restraint test piece, the load sensor and the actuator are all located in the environmental cabinet, the restraint frame is composed of a test piece template, a base plate and a spherical hinge, the test piece template comprises a fixed template and a moving template, the fixed template is fixed on the base plate, the actuator is fixed on the base plate, an execution end of the actuator is connected to the moving template through the load sensor, and the spherical hinge is arranged on the end of the moving template. Compared with the prior art, the test device for the axial full restraint stress is simple in structure, high in test precision and simple in test method. The device can achieve a 100% restraining degree of a test piece, and can control the temperature of a test piece through the environmental cabinet. The device is applicable to measurement of early phase restraint stress of concrete in a scientific research and construction site, and has a wide market application prospect.

Description

technical field [0001] The invention designs a test device and a test method for axially fully constrained stress, belonging to the field of concrete construction. Background technique [0002] With the application of high-strength concrete more and more widely, the water-cement ratio of concrete is getting lower and lower, which leads to the cracking phenomenon of high-strength concrete in the early age of the constraint state is more and more serious, and the evaluation of the early age of concrete under the constraint condition An essential parameter for the risk of cracking is the restraint stress, but the existing devices for measuring the restraint stress at the early age of concrete still have shortcomings such as insufficient accuracy and complicated steps. [0003] At present, the commonly used test methods are mainly the plate method, the ring method and the uniaxial constraint method. Among them, the ring method is widely used because of its simple device and the...

AI Technical Summary

Problems solved by technology

However, the traditional ring test device provides less constraints and the constraint degree is not variable, the concrete is not easy to crack, the sensitivity is poor, and the test cycle is often very long, which seriously affects the efficiency and accuracy of the test

The existing axial restraint stress test is to apply the load by pre-embedded tensile embedded parts or jacks. These two methods cannot guarantee the accuracy of the applied load, and the adjustability of the load size is also poor.

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