聚合物改性硫铝酸盐水泥抗硫酸盐侵蚀性能  

Resistance to Sulphate Attack of Polymer Modified Sulphoaluminate Cement

作　　者：芦令超[1] 李云超[1] 王守德[1] 叶正茂[1] 程新[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：《建筑材料学报》2009年第6期631-634,655,共5页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50672033);山东省科技攻关计划资助项目(SGG0702)

摘　　要：以苯乙烯和丙烯酸丁酯为主要原料,采用预乳化和半连续工艺合成了苯乙烯、丙烯酸丁酯共聚乳液(简称苯丙乳液),并掺入到硫铝酸盐水泥中制备了聚合物硫铝酸盐水泥.采用SEM-EDS,孔结构分析和抗硫酸盐侵蚀性能测试等手段,研究了引发剂用量、聚灰比对聚合物硫铝酸盐水泥耐久性的影响.结果表明:在3%(质量分数,下同)硫酸钠侵蚀溶液和水中,各试样表面都有不同程度的损坏,但在硫酸钠侵蚀溶液中损坏程度较小,且引发剂用量为0.5%时试样的损坏程度要比引发剂用量为0.4%时弱;引发剂用量为0.5%时各聚灰比试样的抗折强度均高于引发剂用量为0.4%时的试样,且在引发剂用量为0.5%,聚灰比为7.5%时,试样的抗折强度最高,即此时水泥硬化浆体的抗硫酸盐侵蚀性能最强;聚灰比为7.5%时试样的总孔隙率最低,聚灰比为5.0%时试样中无害孔所占比例最大.Styrene-acrylic latex was synthesized by pre-emulsification and semi-continuous latex polymerization, with styrene and butyl acrylate as monomers. The effects of initiator dosage and different ratio of polymer to cement on durability of polymeric sulphoaluminate cement were systemically investigated. SEM, pore structure and resistance to sulfate attack were also studied. The results show that the surface of samples is damaged at different degree in 3% Na2SO4 and water respectively. The damaged degree is less serious in corrosive solution than in water, and the damaged degree is less serious when initiator dosage is 0.5% than that is 0.4% and blank specimen. Flexural strength is higher when initiator dosage is 0.5% than when initiator dosage is 0.4 %. Flexural strength is the highest when initiator dosage is 0.5 and mp/mc is 7.5%, in other words, the performance of resistance to sulfate attack is best when initiator dosage is 0.5% and mp/mc is 7.5%. The total porosity is lowest when mp/mc is 7.5%, and innocuous pores are most when mp/mc is 5.0%.

关 键 词：苯丙乳液 硫铝酸盐水泥 抗硫酸盐侵蚀性能 孔结构 

分 类 号：TQ172.79[化学工程—水泥工业]