Experimental Study On High-flowing Concrete With Ground Fine Fluidized Bed Combustion Ashes

High-flowing concrete has wide application in practical projects. Development new material is a hot spots at present .The workability and durability has been improved by admixtures, and can saving cement, have certain economic benefits. The admixtures in concrete application has broad prospects.Fluidized-bed combustion technology is a high efficient, low pollution develop clean-coal combustion technology. But the fluidized bed combustion ashes was researched insufficiency, lack of awareness for fluidized bed combustion ashes, the way of deal with fluidized bed combustion ashes is stack. So caused the waste and environment pollution. The article through experimental study on ground fine fluidized bed combustion ashes-a new admixtures, replace cement for high-flowing concrete ,about the workability, compressive strength, shrinkage and durability. Some conclusions:(1)Because the surface of ground fine fluidized bed combustion ashes is loose, has higher hygroscopicity, the coherency of concrete was improved, but the slump of concretes mix has reduced slightly, through adjustment the amount of highly effective water to meet the request of slump.(2) Because degrades in size the solid sulfur dregs to have self-hardening and pozzolanic properly, after replace cement at same weight, the compressive strength (3d and 14 d)was increased slowly at early time, the compressive strength (28d, 90d and 180 d) was increased obviously at later time .This tendency is increases with the quantity of degrades in size the solid sulfur dregs to mix to increase. The disparity of datum concrete and high-flowing concrete with ground fine fluidized bed combustion ashes at 28d compressive strength is not obvious, the compressive strength of datum concrete is bigger than the compressive strength of high-flowing concrete with ground fine fluidized bed combustion ashes at later time.(3)Ground fine fluidized bed combustion ashes has a litter of sulphate(the amount of SO3 about 6%), as a new kind of admixtures of high-flowing concrete admixtures, the shrinkage of concrete was reduced effectively and with the amount of admixture increases,the shrinkage was reduced gradually.Because ground fine fluidized bed combustion ashes has pozzolanic properly,the compactness of concretes enhance, the anti-water percolation of high-flowing concrete with groun fine fluidized bed combustion ashes is high-level ,after replace cement at same weight, anti-chloride ion penetration has been to enhance,the level enhance with the amount of groun fine fluidized bed combustion ashes increased. Because the amount of Ca(oH)₂ reduce in second hydration, anti-carbonation has been down after replace cement at same weight,the tendency was increased with the quantity of degrades in size the solid sulfur dregs to mix to increase.But the 56d carbonization depth smaller than the smallest concrete cover depth of request for structure.Therefore, the ground fine fluidized bed combustion ashes helpful for improving the workability of high-flowing concrete, can improve long-term strength of concrete, the durability of concrete was improve by control water cement ratio and amount of admixture can.