磷石膏基材料的宏观性能与孔结构的关系  

Research on Relationship between Macroscopic Properties and Pore Sturcture of Phosphogypsum-based Material

作　　者：候姣姣[1] 梅甫定[1] 

机构地区：[1]中国地质大学工程学院,武汉430074

出　　处：《材料研究学报》2013年第6期631-640,共10页Chinese Journal of Materials Research

基　　金：中国地质大学教学实验室开放基金SKJ2012140资助项目~~

摘　　要：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3-200 nm和200 nm-8μm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=AXBφ;本孔结构强度模型σP=σ0(1-∑βjSi)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。The relationships of multidimensional seepage about continuous phase, dispersion strengthening phase and decentralized deterioration phase of the phosphogypsum-based material＇s space were described. The porosity, pore size distribution （PSD）, characteristic pore size and specific sur- face area （SSA） of the samples were measured by mercury intrusion porosimetery （MIP）. The effect of these parameters above mentioned on the compressive strength of system I and system II was investigat- ed. The results show that a lower hydration extent by the limited water supply and high capillary tension contributed to form the pore path precolation and low compressive strength. There are two PSD peaks in the pore size ranges of 3-200 nm and 200 nm-8 prn for all the samples. The pore-percolation changed by dosage of raw materials and specific strength reduce with increasing the water-cement ratio and the rela- tionship among specific strength, shape factors and volume fraction follow roughly the power law, that is σp/σ0=AX^BФ. This model,σp=σ0〔1-∑βji Si〕n exhibited certain superiorities in fitting the correlation andcompensated for the perdiction about value and the actual value for different pore structure of several ex- isting models.

关 键 词：无机非金属材料 孔结构 宏观性能 抗压强度 磷石膏基材料 

分 类 号：TB321[一般工业技术—材料科学与工程]