水泥浆体中氢氧化钙晶体的生长习性  

Growth Habit of Portlandite Crystal in Cement Paste

作　　者：沈裕盛[1] 唐明亮[1] 沈晓冬[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《硅酸盐学报》2016年第2期232-238,共7页Journal of The Chinese Ceramic Society

基　　金：江苏省高校优势学科建设工程项目(2011-6);江苏省博士后科研资助计划(1301033C)

摘　　要：通过在共沉淀体系(CaCl2+NaOH)下研究SO42–、SiO32–和氢氧化钙(CH)过饱和度对CH晶体生长习性的影响,探讨了水泥浆体中CH呈现六方板状的原因。研究表明:SO42–能抑制CH{001}面族的生长,导致CH呈现六方板状形貌。SiO32–的添加则导致CH呈现长柱状形貌。在饱和指数为0.3左右时,CH通过二维成核生长方式形成六方板状形貌。当CH晶体生长主要依靠台阶移动时,{001}面族生长速率最慢,晶面最易显露。水泥浆体中,CH在较低过饱和度下的二维成核生长主导了其六方板状形貌,SO42–的存在则进一步促进了CH往板片状形貌发展。The influences of SO42-. SiO32- and supersaturation on the growth habit of portlandite （CH） crystal in coprecipitation systems （CaCl2＋NaOH） were investigated to clarify CH with a hexagonal platelet morphology in cement paste. The results show that the addition of SO42- inhibits the growth of （001） surface and leads to a hexagonal platelet morphology. The addition of SiO32- causes the formation of prismatic morphology. The two-dimensional nucleation results in the formation of hexagonal platelet morphology when the portlandite saturation index is approximately 0.3. When the growth of CH crystal is controlled by the step movement rate, the growth rate of {001} facets is the smallest. In cement paste, the hexagonal platelet morphology of CH is due to the two-dimensional nucleation at a low supersaturation. The presence of SO42- reinforces the platelet morphology.

关 键 词：氢氧化钙 晶体生长习性 二维成核 过饱和度 

分 类 号：O78[理学—晶体学]