粒度分布对磷石膏-石灰-粉煤灰胶结材物理性能的影响

针对磷石膏-石灰-粉煤灰体系胶结材大量利用磷石膏时，强度发展以及耐水性能的缺陷，采用机械粉磨以改善其粒度分布。探究了不同粒度分布对磷石膏-石灰-粉煤灰体系胶结材的物理性能和耐水性的影响。将磷石膏样品与生石灰以及粉煤灰按一定比例混合，陈化24h再通过粉磨不同时间，达到不同的粒度分布。将不同粒度的样品外掺5%水泥，3%AC增强剂以及0.5%聚羧酸减水剂，按照标准稠度用水量加水在160 mm×40 mm×40 mm试模中成型，在养护室中养护到规定龄期再测定试件的物理性能以及微观分析。结果表明，磷石膏掺量达到40%，通过粉磨的物理活化，该体系按照水泥砂浆砌块成型，28 d抗压强度≥27.76 MPa，软化系数达到86%的胶凝材料，并且无废水排除，杜绝二次污染。

Influence of different granular distributions on physical properties of phosphogypsum-lime-fly ash system

To against the defect of the strength developing and water resistance of phosphogypsum-lime-flyash system，machine grinding was used to improve the granular distributions.The physical properties and the water resistance of the phosphogypsum-lime-flyash system in different granular distributions were studied.After blended phosphogypsum with lime and flyash in different proportions，aged for 24h，the samples were pulverized into different granular distributions.Added cement，AC reinforcing agent and water reducer with proportions of 5%，3% and 0.5% respectively，the samples were poured water which according the water consumption of standard consistency.Before measuring the physical properties and water resistance，specimens were shaped in the model of 160 mm×40 mm×40 mm and conserved in the curing room for different ages.The results showed that including 40% phosphogypsum and activating by pulverizing，these specimens pressure strength and softening coefficient can reach at 27.76 MPa and 86% after 28 d of the preparation of specimens as cement mortar blocks，without discharging waste water which causing secondary pollution.