Research Effect Of Additive On Alkali-active Slag Concrete

The additives which been used in HPC widely, concrete is developed toward high performance, meanwhile, it promote recovery of the via-product powder of industry, reduce the quantity of cement in concrete, and improve concrete according to environment.The preparation of alkali activated slag concrete stimulates the active of slag fully by chemical activated ways. It replaces cement in concrete, save resource and energy. The performance of concrete which preparation used alkali activated slag is very good. The durability is good, and cycle of life is prolonged. It may use recycle aggregate and other common aggregate. It is the trend of concrete sustainable development.For the utilization of slag is full, The research of additive which be added into lime-silicate concrete replace slag on the performance of concret have important economic and utility significance.The research is use llithium slag, fly ash, limestone powder and silica as additives replace slag, reduce the ratio of slag in alkali activated slag concrete, and improve the property of alkali concrete. Research different additive effect on the workability, mechanical property, durability of defense chloride ion diffusion, resist carbonize, vitriol resistance and so on. Research its effect of compound-superposition, research it effect of property of alkali activated slag concrete improve result and effect of property research its change of microscopic structure.The research indicate that (1) when the specific gravity and modulus of soluble glass is 1.5 and 1.1, the effect of activate slag is best. (2) The milled llithium slag and fly ash can improve the fluidity, coherence, bleeding and consistency of alkali activated slag concrete. Use specific surface fly ash replace slag can debase forepart strength of alkali activated slag concrete. And improve anaphase strength is big. When adding 10% fly ash, the strength of 28^th day reaches 73.5MPa. When adding 70% fly ash, the strength of 28th day reaches 51.3MPa. (3) When silica mix into concrete of alkali activated slag with fly ash and llithium slag can debase flow ability of concrete. And not bleeding, consistency is big. Improve the compression strength distinctness, the 28th day increase 21%, the 60^th day increase 20.8%. (4) The effect of mix llithium slag and fly ash improve the long-term compression strength is better than mix llithium slag alone. And mix llithium slag and fly ash improve splitting tensile strength and cross bending strength is not patent. (5) Limestone powder is a good additive in alkali activated slag concrete. Adding limestone powder with specific surface is 6000cm²/g can improve the flow ability concrete. When quantity adding of limestone powder is low 50%, it can improve compression strength of alkali activated slag concrete. (6)the coefficient of permeability is small in alkali activated slag concrete at this experimentation, the 28th is (0.631～1.667)×10^-12, the 180^th is (0.199～0.877)×10^-12 . (7) The ability alkali activated...