Manufacture And Study Of Expansive Agent Materials

With the rapid development of China' s national economy, China' s roads, bridges, and railway undertakings have been developing rapidly, and even built a large number of domestic can name world-class construction project, however, China' s construction of the concrete cracking and seepage Leakage is still a serious problem and improve the structure of the impermeable cracking capacity and reduce maintenance costs, with enormous social and economic benefits.Concrete surface quality is the most important impact on the durability of concrete, concrete surface cracks and the durability of concrete there is a clear (but not only), especially in the South wetter areas, the marine environment, major rivers or humid environment of the concrete structure Project, the cracked concrete seepage problem is widespread, mainly due to hydration and hardening process, the ordinary concrete material will inevitably have a contraction deformation. Constraints in the circumstances, when the contraction deformation can not be met, the concrete internal stress accumulated to a certain value after the cracking. So that harmful media including water intrusion in the internal concrete, resulting in concrete within the Ca(OH)₂, aluminate, and so reduce chemical composition, resulting in loose concrete structure, a series of problems such as rusty steel.in this paper, the main elements of the compensation contraction of expansion agent, expanders of the chemical composition of the expanders impact analysis, the raw material for the preparation expanders component analysis, physical and mechanical properties testing and microscopic analysis, the incorporation of the physical expansion agent after the concrete Mechanical properties testing and microscopic analysis, the final project through the practical application of the application of the expanders were identified.In this paper, the main elements of the compensation contraction of expansion agent, expanders of the chemical composition of the expanders impact analysis, the raw material for the preparation expanders component analysis, physical and mechanical properties testing and microscopic analysis, the incorporation of the physical expansion agent after the concrete Mechanical properties testing and microscopic analysis, the final project through the practical application of the application of the expanders were identified. Can be concluded through research, Non-load cracks in concrete by the deformation of contraction caused by the construction of the expansion agent compensation can be the contraction of concrete, but expanders will lead to the deterioration of the concrete work, fly ash to the contraction of concrete impermeability of compensation will have an impact, I mixing the appropriate level of fly ash to raise the compensation to the impermeability of compensation contraction of the concrete is very important, conservation of at least 14 d,when conditions permit is absolutely the best wetland conservation, to provide adequate water source so that expansion ettringite Formed to improve the concrete anti-crackingperformance.