Saturated Hydraulic Concrete Experimental Study In Injury And Damage

Safety and rationality of concrete structure design depends largely on the mechanical parameters are correct. Many concrete construction in the civil engineering industry, such as dam, piers and offshore structures, etc., since the long-term work in an aqueous environment, their strength is obviously lower than in their dry state. Studies have shown that the humidity is an important factor to cause the strength change of concrete structure, mechanics performance of concrete structure under different humidity environment has a big difference. Due to the complexity of concrete structure and internal structure after soaking affected by the immersion liquid and other reasons, research concerned mechanism for damage and destruction of wet concrete under different environments is still relatively small. Therefore the study of wet concrete damage and destruction law, to provide more accurate material mechanical parameters for practical project is particularly important.Taking wet concrete under different liquid immersion as the main research object, mainly through uniaxial static compression test and the control variable analysis method, this paper discusses the influence of wet concrete strength of various factors, and some research results are obtained.First of all, in order to study influence of immersion time and immersion liquid surface tension and immersion liquid bulk modulus on concrete strength, uniaxial compressive strength test with concrete specimens immersed at different times in different immersion liquids were carried out, the paper on the test process are introduced in detail, and the results were analyzed.Secondly, after finishing the test data, it was concluded that with the increase of immersion time, wet concrete strength decrease; As immersion liquid surface tension increases gradually, strength of concrete shows a downward trend; Paper also believe that the main reason for the wet concrete strength reduce also associated with the bulk modulus of immersion liquid, the final conclusion is that with the increase of immersion liquid bulk modulus, wet strength of concrete decreases.Thirdly, based on a one-dimensional diffusion theory, inside humidity field of concrete specimens were obtained through MATLAB program, and discrepancies existing experimental phenomena and theoretical place also got explained. Through the analysis of strength change of the specimen at different soaking time, the influence of the immersion time on the humidity and strength of concrete were discussed.Finally, by using infrared nondestructive testing technology, the paper carried out wet concrete(in different states) infrared image analysis during its damage and failure, and preliminary discussed the damage and failure modes of concrete after immersion in different liquids. By using ultrasonic inspection,we discussed the velocity changes of saturated concrete during the loading process, and analyzes the difference of wave velocity in concrete after immersion in different liquids.