聚羧酸系减水剂对铝酸三钙-石膏体系早期水化的作用机制  

Mechanism of polycarboxylate superplasticizer on early hydration of tricalcium aluminate⁃gypsum systems

作　　者：衷从浩 黄伟 周佳敏 麻秀星 方云辉 吕满荣 ZHONG Conghao;HUANG Wei;ZHOU Jiamin;MA Xiuxing;FANG Yunhui;LÜManrong(Institute of Advanced Manufauting,Fuzhou University,Jinjiang,Fujian 362252,China;College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;Lets Holding Group Co.,Ltd.,Xiamen,Fujian 361004,China)

机构地区：[1]福州大学先进制造学院,福建晋江362252 [2]福州大学土木工程学院,福建福州350108 [3]垒知控股集团股份有限公司,福建厦门361004

出　　处：《福州大学学报（自然科学版）》2023年第6期850-857,共8页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(2021J05124);福建省中科院STS计划资助项目(2022T3032);中国博士后科学基金资助项目(2020M671951)。

摘　　要：为探究聚羧酸系减水剂(PCE)对铝酸三钙(C_(3)A)-石膏体系早期水化的作用机制,通过水化进程、溶解速率、物相演变和溶液离子浓度进行表征,分析PCE对C_(3)A-石膏体系早期水化的影响机理.结果表明:PCE的掺入抑制了C_(3)A颗粒的溶解,阻碍了钙矾石(AFt)晶体在C_(3)A颗粒表面的成核生长,并使石膏处于较低的溶解平衡状态;PCE在颗粒表面的吸附改变了SO_(4)^(2-)、Ca^(2+)等的空间分布,促使各种离子在颗粒表面的聚集,增加了离子之间碰撞、沉淀,有利于形成单硫型水化硫铝酸钙(AFm)物相.The mechanism of polycarboxylate superplasticizer(PCE)on the early hydration of tricalci⁃um aluminate(C_(3)A)-gypsum system was investigated.The influence mechanism of PCE on the early hydration of C_(3)A-gypsum system was analyzed by characterizing the hydration process,dissolution rate,phase evolution and solution ion concentration.The results show that the incorporation of PCE in⁃hibits the dissolution of C_(3)A particles,hinders the nucleation and growth of ettringite(AFt)crystals on the surface of C_(3)A particles,and keeps the gypsum in a lower dissolution equilibrium state.The ad⁃sorption of PCE on the particles changes the spatial distribution of SO_(4)^(2-),Ca^(2+),etc.leading to the pore solution is not consistent with the ion concentration on the particle surface,which promotes the aggregation of various ions on the particle surface,increases the collision and precipitation among i⁃ons,and is conducive to the formation of monosulphate(AFm)phase.

关 键 词：聚羧酸系减水剂 铝酸三钙 水化产物 离子浓度 饱和指数 

分 类 号：TU528[建筑科学—建筑技术科学]