Study On The Mechanical Properties Of Modified Rubber Concrete With Temperature Effects

With the expansion of the scope of modern engineering exploration,the performance requirements of concrete have become higher and higher,and modified concrete has emerged as the times require.By mixing rubber particles in different proportions,the original brittleness property of concrete can be improved,and it has obvious advantages in shock absorption,noise reduction and impact resistance,and it is also in line with the country’s current green environmental protection concept.For special environments,such as metallurgical high-temperature workshop,chemical workshop and polar ocean environment,the corresponding structural facilities will be affected by extreme temperature environment.However,research reports on rubber concrete structures in this type of environment are very rare.In order to verify the applicability of the rubber concrete structure under special temperature and environmental conditions,and provide a reference for related design,relying on the "Hubei Natural Science Foundation project(2020CFB860)",the mechanical properties of the modified rubber concrete before and after the tempe rature effect were specially carried out.The specific research content is as follows:(1)Research on rubber modification methods.The "Na OH lye soaking method" and the "petrochemical method(pre-coated with mortar)" were used to treat rubber,and compared with untreated rubber concrete to evaluate the pros and cons of various concrete molding processes.By comparing different types of concrete Analyze the conventional mechanical properties of the rubber to determine the basic ratio of rubber concrete suitable for temperature testing.(2)Experimental study on the mechanical properties of modified rubber concrete after high temperature.For different rubber content(0%,5%,20%)petrochemical modified rubber concrete,Na OH solution immersion modified rubber concrete and ordinary rubber concrete,the highest temperature was 120 ℃,220 ℃ and 320 ℃respectively.The compressive properties,splitting tensile properties and flexural properties of the later specimens were tested and tested.(3)Experimental study on the influence of the mechanical properties of modified rubber concrete at low temperature.For each batch of samples of the same high temperature group,carry out experimental research on the compressive performance,splitting tensile performance and flexural performance of the specimens at low temperatures of 0 ℃,-20 ℃,-60 ℃ and-100 ℃.(4)Theoretical research on intensity fitting model.According to the concrete data after high temperature,the linear fitting and polynomial function fitting of compressive strength,splitting tensile strength and flexural strength are established,and two fitting function models of compressive strength changing with high temperature are proposed;A polynomial function fitting of compressive strength,splitting tensile strength and flexural strength of concrete data under low temperature state was established,and a fitting function model of compressive strength changing with low temperature was proposed.