运用激光扫描共聚焦显微镜观察新拌浆体多级絮凝结构  

Observation of the multi-level flocculation structures of fresh cement pastes by confocal laser scanning microscope

作　　者：张力冉[1] 王栋民[1] 张伟利[1] 朴春爱[1] 

机构地区：[1]中国矿业大学(北京),北京100083

出　　处：《电子显微学报》2013年第3期231-236,共6页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助面上项目(No.50872151)

摘　　要：在聚羧酸超塑化剂、萘系超塑化剂、木质素磺酸盐类超塑化剂饱和掺量下,运用激光扫描共聚焦显微镜(CLSM)直接观测三维空间的新拌水泥浆体水泥颗粒与水泥水化颗粒的絮凝情况,研究了不同类型超塑化剂对新拌水泥浆体中絮凝结构的影响规律。研究结果表明,经CLSM观察发现:掺加聚羧酸超塑化剂的水泥浆体内的絮凝结构体积较小且较为分散,而掺加其他类型超塑化剂的浆体内部絮凝结构体积较大且分散不均匀,不同分散强度的超塑化剂会打开不同级次的絮凝结构,从而显示出不同的减水率,由此构建新拌浆体多级絮凝结构理论模型。多级絮凝结构对于认识水泥-水-超塑化剂浆体结构和开发新型超塑化剂具有重要指导意义。In this study, under saturation dosage of polycarboxylic, poly naphthalene sulphonate or lignosulfonatepoly, the distribution of solution and flocculation microstructures in fresh cement paste were observed with confocal laser scanning microscope （CLSM） in three-dimensional space. The results show that the changes of the size of flocculation structures and the dispersion of solution are obviously detected with CLSM： the size of floceulation struetures is smaller and more dispersed in fresh cement paste with polycarboxylate superplasticizer, but the size of flocculation structures is bigger and cannot be dispersed uniforully in fresh cement paste with others SP. Different kinds of SP with different dispersion strength will open the floceulation structures at different levels, which in turn present different water reducing rate. The multi-level flocculation structures theoretical model of fresh cement paste （ MLFSTM ） is then built up. The multi-levels flocculation structures is significantly instructive and is helpful for knowing the pastes＇ structures among the cement, water and water reducing agents as well as developing the new water reducing agents.

关 键 词：激光扫描共聚焦显微镜 多级絮凝结构 超塑化剂 级次 

分 类 号：TU528.042.8[建筑科学—建筑技术科学]