Method and apparatus for testing early self-deformation of concrete

Abstract

The invention relates to a method for measuring the initial distortion of concrete and relative device. Wherein, it comprises the detections on the condensation of concrete and the self-dry contraction after initial condensation, while the front one uses vertical length measure, while embedding temperature sensor in the concrete, arranges detector at the top, and uses non-contact displacement sensor to measure the detector displacement generated by the concrete condensation, and uses computer to record the initial data of displacement sensor and the temperature sensor and the period data until the concrete is condensate; the second one uses transverse length measure method that embedding temperature sensor into the concrete; arranges detectors at two ends of test sample; uses non-contact displacement sensor to measure the displaces of detectors caused by the self-dry contraction after the condensation; and uses computer to record the initial data of displacement sensor and the temperature sensor and the period data. The invention can make the measure initial time of self contraction after irrigate molding, while the test result has better repeat ability and high accuracy.

Description

technical field [0001] The invention relates to a method and a device for testing early self-deformation of concrete, which belong to the technology of concrete shrinkage deformation testing. Background technique [0002] At the Shrinkage of Concrete 2000 International Conference held by the International Federation of Testing and Research Laboratories for Materials and Structures (RILEM) in 2000, an important topic was: how to accurately test shrinkage? The test about shrinkage, especially the test of self-shrinkage, still fails to form a unified standard. There is a lot of controversy in different literatures about the early autogenous shrinkage measurement results. In the final analysis, it is caused by the different test methods. There are many difficulties in interpreting the test results based on different test methods. Therefore, The impreciseness of the test method has seriously hindered the progress of autoshrinkage research. How to measure the initial time earlie...

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Problems solved by technology

However, there are also literature reports that the suckback after bleeding may reduce autogenous shrinkage and even lead to early concrete expansion.

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