The Experimental Research On The Shrinkage And Crack Properties Of Waste Mineral Admixture Concrete

A lot of granite stone powder, stone powder, fly ash, coal gangue and other industrial waste was made in the process of industrial production in China, A series of problems was caused by the low recycling utilization rate of the the solid waste such as occupying a large amount of land, polluting the environment. In order to utilizing these industrial wastes resources in concrete, physical experiments and theory analysis are combined in my studies, the effects of of single doped, double doped on the working performance, compressive properties of concrete, frost resistance,anti-permeability affects performance, shrinkage properties, anti-cracking performance was systematic studied. Cracking factor K was introduced to evaluate the performance of concrete and the optimal dosage in concrete of the the abandoned mineral admixture obtained. The test results showed that:(1) When the mixing amount of the stone powder, fly ash, coal gangue is20%, for the work performance, compressive properties, impermeability properties, frost resistance properties is best. When the mixing amount of the stone powder, fly ash, coal gangue is30%, the compressive properties, impermeability properties, frost resistance properties of concrete is worse than reference group. When the mixing amount of coal gangue is30%, the performances of the concrete decrease obviously.(2) When the mixing amount of granite stone powder is10%,20%,30%, in each group, the alkali content and chloride ion content of concrete decreased significantly than the reference group and meets the requirements of the national standard.(3) The shrinkage and cracking property of concrete was evaluated by using the cracking factor K, when the mixing content of the granite stone powder, stone powder is20%, the amount of fly ash is30%, the ratio between the granite powder and fly ash, stone powder and fly ash is1:2, the performances of the concrete are best.Through this research,a new way of resource utilizing waste mineral admixture which not only can develop a new concrete materials whose basic properties and shrinkage and crack resistance properties is good, but also can effectively solve the pollution problem of the environment was find. Therefore, to use these several industrial waste as admixture of concrete not only has significant economic, social, ecological significance, but also has huge market potential.