Research The Anti-segregation On Light-weight Aggregate Concrete

In recent years, with the rapid development of construction, concrete construction projects become the most widely used and one of the largest amount of building materials. At the same time, promote saving society in China, to promote energy saving, green emission reduction strategies for sustainable development, reducing large-scale use of steel to reduce the structural weight, the construction industry become a hot research problem, so lightweight aggregate concrete to highlight the its advantages. Lightweight aggregate concrete, because of its lightweight, high strength, insulation, fire resistance, sound insulation, good seismic performance characteristics such as applied in modern buildings. With China’s rapid development of lightweight aggregate concrete, it will become second only to the amount of ordinary concrete a new concrete.The development of lightweight aggregate concrete for almost half a century, with industrial waste, urban waste as raw materials to produce green light aggregate technology matures, people can use green light aggregate a large number of alternative preparation of the natural aggregate concrete, This can not only reduce production costs, while maintaining the purpose of turning waste into treasure, with good social, economic and environmental benefits. The current segregation of the lightweight aggregate concrete and the brittleness of more prominent than normal, for improving the tensile strength of lightweight aggregate concrete, improving brittleness and enhance resilience, in particular the floating Lightweight Aggregate demand more and more pressing issues. Therefore, this paper improve the segregation resistance of lightweight aggregate concrete point of view, lightweight concrete by adding different kinds and dosage of admixture and fiber materials, and then test the treatment, the strength of lightweight aggregate concrete, layered degree, the slump and expansion degree of the microstructure of fly ash concrete ceramic, research materials and organic fibers mixed with lightweight aggregate concrete anti-segregation on the performance improvement, so that the lightweight aggregate concrete more suitable for practical engineering applications.Firstly, the use of fly ash and slag as admixture to the lightweight aggregate concrete, test its compressive strength, slump, and Spreading of hierarchical degrees of mineral admixture Segregation of lightweight aggregate concrete performance improvement, research different types of single-doped mineral admixture, complex admixture when mixed with ash on mechanical properties of lightweight aggregate concrete and the impact of heterogeneity. The results show that, when mixed with fly ash and slag alone, with the admixture content increased, the 28d compressive strength of lightweight aggregate concrete increased stratification were decreased; when the fly ash, slag single 20% of mixed content, lightweight aggregate concrete peak of the indicators; when mixed with fly ash and slag recovery, not only can improve the compressive strength of lightweight aggregate concrete, and can effectively improve their work performance and stratification, improve the performance of its anti-segregation.To further improve the segregation resistance of lightweight aggregate concrete performance, this article by adding lightweight aggregate concrete steel fiber and polypropylene fiber, test its compressive strength, slump, and Spreading of hierarchical degree of fiber material on the light Segregation of concrete aggregate performance improvement, research different types of single-doped fiber, complex when doped fiber content on mechanical properties of lightweight aggregate concrete and the impact of heterogeneity. The results show that when the steel fiber and polypropylene fiber single-doped, with the fiber content increased, the compressive strength of lightweight aggregate concrete basically unchanged, its slump, and Spreading of ever-lower layer, but can meet the requirements of the use of lightweight aggregate concrete; When the steel re-doped fiber and polypropylene fiber, can effectively improve their hierarchical level, but the lightweight aggregate concrete have an impact on liquidity, should pay attention to re-doped fiber the ratio of content.For lightweight aggregate concrete interface problems, this paper SEM scanning electron microscope Fly Ash Aggregate Concrete Surface interfacial transition zone microstructure, morphology of hydration products, material composition, the energy spectrum analysis, the results show that the fly ash Tao grain interface area of concrete is not very clear, after hydration of cement and admixture to form a dense layer of cementitious material structure, interface structure, there is increasing trend.Studies have shown that use of mineral admixture and fiber materials to improve the segregation resistance of lightweight aggregate concrete performance is feasible, both fly ash and slag mineral admixture is better than the modified steel fibers and polypropylene fiber, after mineral admixture and fiber material modification to meet the requirements of lightweight aggregate concrete. This article provides a lightweight aggregate concrete theoretical and practical basis, with high environmental and economic benefits.