用压汞法测量孔隙分布、孔隙率和体积、特征孔隙尺寸、孔隙比表面积,描述了磷石膏基材料的连续相、分散增强相和分散劣化相在其空间内的多维渗流关系,研究了这些参数对不同掺量下试件抗压强度的影响.结果表明,磷石膏基材料在低含水量条件下水化不充分,孔隙压力大,易出现连通的大毛细孔和微裂纹,导致强度降低;各原料添加量的不同改变孔渗流作用,导致磷石膏基材料在3-200nm和200 nm-8μn区间出现明显的孔隙分布峰;试件的抗压强度与孔在三维空间出现渗流通路的临界点强度比随着水灰比的增加而降低,且其比值与孔形状因子和体积分数大致符合幂律概率分布规律,即σP/σ0=AXΒψ;本孔结构强度模型ρP=σ0(1-∑βjiSi)n 拟合曲线表现出一定的相关性,弥补了现有几种模型中不同孔结构范围预测值与实际值偏离较大的不足.
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