过硫磷石膏矿渣水泥混凝土的配合比优化设计研究

Optimization Design Research on the Mix Proportion of Persulphated Phosphogypsum-slag Cement Concrete

过硫磷石膏矿渣水泥作为一种新型免烧环保胶凝材料，采用40%～50%的磷石膏、40%～50%的粒化矿渣、2%的钢渣和约4%的硅酸盐熟料经混合、粉磨制成。为了实现磷石膏的大规模资源化利用，开展了对过硫磷石膏矿渣水泥混凝土的配合比优化设计的研究，系统研究了C30过硫磷石膏矿渣水泥混凝土的配合比设计，并进行了设计优化。根据普通混凝土配合比设计规程以及过硫磷石膏矿渣水泥的特性，配制出了C30大流动性混凝土，通过修正鲍罗米公式来确定最佳水灰比，进行优化配比，28 d抗压强度可达38.5 MPa。参照C30混凝土水灰比研究结果，结合高性能混凝土最简易配合比设计方法，确定水灰比和最佳砂率。

Persulphated phosphogypsum-slag cement （PPSC） is a kind of new unfired environmental protection cementing materials. It＇s mixed and ground with 40% - 50% phosphogypsum, 40%-50% ground granulated blast-furnace slag （GGBFS）,2% steel slag and 4% portland cement clinker. In order to realize resourceful utilization of phosphogyp sum,optimization design on the mix proportion of PPSC are studied. The mix proportion design method for C30 are sys- tematically studied and a design optimization was carried out. According to the design regulations of mix proportion of or dinary concrete and the characteristics of PPSC, the C30 high flowing concrete is prepared, and the optimum water-cement ratio is obtained based on revised Bowromi formula. According to the mix proportion optimization design, the 28 d strength is up to 38. 5 MPa. The results of research on the water-cement ratio of C30 concrete and the simple mix propor tion method of high-performance concrete are adopted to determine the optimum wate-cement ratio and sand ratio.