聚羧酸类减水剂对水化硅酸钙微观结构的影响  

EFFECT OF POLYCARBOXYLATE-TYPE SUPERPLASTICIZER ON MICROSTRUCTURE OF CALCIUM SILICATE HYDRATES

作　　者：张文生[1] 王宏霞[1] 叶家元[1] 

机构地区：[1]中国建筑材料科学研究总院水泥科学与新型建筑材料研究所,北京100024

出　　处：《硅酸盐学报》2006年第5期546-550,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50302008);武汉理工大学硅酸盐材料工程教育部重点实验室开放课题基金(SYSJJ2004–07)资助项目。

摘　　要：用Na2SiO3·9H2O,Ca(NO3)2·4H2O化学试剂及聚羧酸类减水剂合成了水化硅酸钙(C–S–H)及掺杂聚羧酸有机大分子的C–S–H。用X射线衍射、X射线光电子能谱、透射电镜等分析手段研究了聚羧酸类减水剂对C–S–H结构的影响。研究表明:聚羧酸类减水剂增加了Ca与Si摩尔比n(Ca)/n(Si)为0.83的C–S–H硅氧四面体聚合度,提高了C–S–H的结晶程度,其中聚羧酸有机大分子基团可内插到C–S–H结构的层间。在C–S–H形成过程中,聚羧酸有机大分子基团会通过其极性基团—COOM—与Ca2+键结,而Ca2+另一端与—O—Si—O—键连接,最后形成一个离子型交联结构。Calcium silicate hydrates （C-S-H） and C-S-H containing organic complex molecule were synthesized by Na2SiO3 -9H2O, Ca（NO3）2 · 4H2O and polycarboxylate-type superlasticizer. The effect of polycarboxylate-type superlasticizer on the microstructure of C-S-H were characterized by X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscope. The results show that polycarboxylate-type superplasticizer increases the polymeric degree of the dreierketten chains, and the polycarboxylate- type organic complex molecule increases the crystallinity of the C-S-H. The organic complex molecule intercalates into the inner interlayer surface of the C-S-H. During the formation of the C-S-H, Ca^2＋ is ionically bonded to the-O-Si-O-linkage of the inorganic bridge and to the functional group of the polycarboxylate-type organic complex molecule so that an ionically crosslinked structure is formed.

关 键 词：水化硅酸钙 羧酸盐 插层复合 结晶度 聚合度 离子型交联结构 

分 类 号：TU172.11[建筑科学—建筑理论] TU528.01