木质素磺酸盐的性质及其与聚羧酸的复配性能  

Property of Lignosulfonates and Their Compatibility with Polycarboxylate-Type Superplasticizer

作　　者：楼宏铭[1,2] 纪楷滨[1,2] 梁悄[1,2] 邓国兴[1,2] 邱学青[1,2] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640 [2]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《建筑材料学报》2011年第5期685-689,共5页Journal of Building Materials

基　　金：国家杰出青年科学基金资助项目(20925622);广东省自然科学基金团队项目(8351064101000002);华南理工大学中央高校基本科研业务费专项基金资助项目(2009ZZ0027)

摘　　要：研究了4种不同特点的木质素磺酸盐SBL,GSBL,CLS,GCL1与聚羧酸系减水剂PCE的复配性能.结果表明:木质素磺酸盐的质量分数、相对分子质量及磺化度越高,其分散性能就越强,与PCE的协同增效作用就越显著;复配后均使水泥净浆流动度增大,并降低PCE对掺量的敏感性;复配后能进一步延长水泥的凝结时间,并提高了水泥水化程度.木质素磺酸盐对掺PCE砂浆的增强顺序为:GCL1>CLS>GSBL>SBL,与分散性能一致.木质素磺酸盐与PCE复配后使水泥水化温峰延后,峰值升高,水化热增大,水化更加完全,使水泥石结构更加完整、致密,有利于提高强度.The effect of four lignosulfonates（SBL,GSBL,CLS,GCL1） of different features on the performance of cement paste with polycarboxylate-type superplasticizer（PCE） added were investigated. Results indicate that lignosulfonates of higher purity, molecular weight and sulfonation degree have stronger dispersibility for cement paste with PCE added. The lignosulfonates lead to an increase in fluidity of cement paste with PCE added and reduced sensitivity of PCE to dosage. The setting time of cement paste becomes longer while the lignosulfonates enhance cement hydration degree through increasing dispersibility of PCE, The compressive and flexural strength of hardened mortars with combined admixtures as well as the dis- persibility decrease in the order of GCLI〉CLS〉GSBL〉SBL. Lignosulfonates addition delays the occurrence of temperature peak of cement hydration, raises the peak, increases total heat and degree of hydration and eventually more compact and complete inner microstructure is formed in cement stone, which contributes to higher strength of concrete.

关 键 词：木质素磺酸盐 结构 聚羧酸减水剂 复配 水泥 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]