Concrete cracking whole-process simulating tester

Abstract

The invention provides a concrete cracking whole-process simulating tester which comprises a base. The base is provided with an environment box, a concrete test piece containing device, a real environment simulating system and a loading system, wherein the environment box is separated from a surrounding environment, the concrete test piece containing device is arranged in the environment box and comprises a fixed chuck, a movable chuck and a test piece middle fixing side template, a concrete test piece containing space is spliced, the fixed chuck is fixedly arranged in the environment box, the movable chuck is movably arranged, a temperature sensor is arranged in the environment box and the concrete test piece containing space, the real environment simulating system at least comprises a temperature regulating device which is arranged in the environment box and the concrete test piece containing space and simulates the set real environment on the aspect of temperature, the loading system makes the movable chuck fixed or move in the axial direction, a displacement / deformation sensor is arranged on the movable chuck and used for sensing the deformation of a concrete test piece, and a stress sensor is arranged for sensing the loads borne by the test piece. The whole development process of the temperature, stress and other factors of concrete can be tested under changeable environment conditions from the perspective of tests.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and relates to a method for testing the whole process of cracking of concrete based on a real environment and a testing machine using the method, more specifically, a device for the simulation test of the whole process of cracking of large-volume concrete. Background technique [0002] For a long time, "no dam, no crack" has been an unsolved problem in the world. The appearance, performance and safety of the dam structure are affected by the appearance of cracks, and ultimately affect people's lives and properties. How to reduce or even prevent cracks has become a problem that project builders must consider. With the advancement of theoretical and technical research in related fields, the research work on dam concrete cracks has made significant progress, especially the temperature control and crack prevention of large-volume concrete. At present, a relatively...

AI Technical Summary

Problems solved by technology

[0005] 1. Most measuring devices use indirect measurement methods or strain gauges to measure the deformation of the specimen, and the accuracy is not satisfactory

[0006] 2. For many testing machines, it is necessary to test the specimen in various simulation environments. Various environments have a great impact on the measurement accuracy of displacement and deformation, making the measurement accuracy not high

[0007] 3. In the existing technology, in terms of research on concrete material cracking, temperature stress test equipment is mostly used at present, which cannot accurately measure the deformation of early concrete cracking, and analyze and evaluate the cracking trend of concrete, which has not achieved the ideal effect of the research.

[0008] 4. Existing test piece displacement or deformation measurement devices are limited to gauge lengths of various displacement deformation sensors below 200 mm. For test pieces with a length of more than 1 meter, it is difficult to give accurate and reasonable measurements of the deformation or displacement of the test piece. Measurement

[0009] Furthermore, in the testing machine in the prior art, the specimen holding part is a rigid part, and the centering is poor.

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