硫酸根离子对CaO-Al_2O_3-P_2O_5-SiO_2体系耐水性的影响  

Effect of sulfate ion on the water-resistance property of CaO-Al_2O_3-P_2O_5-SiO_2 system

作　　者：衣朝华[1] 苏磊[1] 李仕群[1] 任书霞[1] 赵发伟[1] 

机构地区：[1]济南大学材料科学与工程学院,山东济南250022

出　　处：《水泥》2005年第12期3-6,共4页Cement

基　　金：国家自然科学基金(59772022);山东省自然科学基金(Q2003.F02)

摘　　要：研究了硫酸根离子对CaO-Al2O3-P2O5-SiO2体系耐水性的影响,通过XRD、SEM及孔结构分析手段对其耐水性机理进行分析。结果表明:在CaO-Al2O3-P2O5-SiO2体系中掺入适量的硫酸根离子,不会改变其主要水化产物的组成。浸水180d后,掺石膏的试件211S的耐水性指数较未掺石膏的试件211提高10.2%,劈裂强度提高6.7%,Ca2+、[AlO4]5-离子溶出浓度分别下降11.59%、7.2%,211S具有优异的孔结构。掺入硫酸根离子可以明显的提高该体系的后期强度和耐水性。The water-resistance mechanism of CaO-Al2O3-P2O5-SiO2 system with or without of additional S04 ions was analyzed by means of XRD and the pore structure analysis. The results indicate that CaO-Al2O3-P2O5-SiO2 system by adding sulfate ion didn＇t change the main hydration products. At the age of 180d immersing in-water, the waterresistance indexes of 211S （containing sulfate ion） were 10.2% higher than that of 211 （without sulfate ion）, the splitting strength increased by 6.7%, and the concentration of Ca^2＋ of hydration system dropped by 11.59%, the concentration of [AlO4]^5- of hydration system dropped by 7.2% due to the nice pore structure of 211S. CaO-Al2O3-P2O5-SiO2 system by adding sulfate ion has a good late strength and a good ability of water-resistance.

关 键 词：硫酸根离子 CaO-Al2O3-P2O5-SiO2体系 耐水性 水化机理 

分 类 号：TQ172.12[化学工程—水泥工业]