超长侧链型聚羧酸梳形共聚物对水泥早期水化的影响  

Impact of polycarboxylate dispersant with super-length of side chains on early hydration of cement

作　　者：乔敏 俞寅辉[1] 冉千平 毛永琳 刘加平[1,2] 

机构地区：[1]江苏省建筑科学研究院高性能土木工程材料国家重点实验室,江苏南京210008 [2]江苏博特新材料有限公司,江苏南京210008

出　　处：《功能材料》2012年第12期1561-1563,1568,共4页Journal of Functional Materials

基　　金：国家重大基础研究发展计划(973计划)资助项目(2009CB623205)

摘　　要：选用了一组超长侧链型聚羧酸梳形共聚物作为水泥体系的分散剂,通过水化热测定、强度试验和扫描电镜等表征手段,研究了超长侧链型聚羧酸梳形共聚物分散剂对水泥早期水化的影响。研究发现,超长侧链型聚羧酸梳形共聚物比普通聚羧酸梳形共聚物具有加速水泥水化、提高水泥基材料强度的作用。扫描电镜得到的形貌结果发现,超长侧链型聚羧酸梳形共聚物的掺入改变了水化产物的形貌,并且侧链越长,呈絮状的C—S—H凝胶和呈针状的钙矾石晶体明显增加。这说明超长侧链型聚羧酸加速了C—S—H凝胶和钙矾石晶体的形成,促进了水泥混凝土体系早期强度的形成。A serial of polycarboxylate dispersants with super-length of side chains were used as the dispersant for cement.The impact of the dispersant on the early hydration of cement was investigated in system using isothermal calorimetry measurements,compressive strength and scanning electron micron-scope.The polycarboxylate dispersants with super-length of side chains accelerate the early hydration of cement more than the common polycarboxylate dispersants and evidently enhance the strength of cement-based material.The morphology tells that the addition of polycarboxylate dispersants with super-length of side chains changes the morphology of the hydrated production.As increasing the length of super side chains,the floc-like C—S—H and needle like type of ettringite crystals increased.

关 键 词：聚羧酸 超长侧链 水泥水化 水化形貌 

分 类 号：TQ172.1[化学工程—水泥工业]