纳米CaCO_3对硫铝酸盐水泥水化硬化特性的影响  

Influence of nano-CaCO_3 on hydration and hardening characteristics of sulphoaluminate cement

作　　者：朱艳超[1] 马保国[2] 赵河闯 谭洪波[2] ZHU Yanchao;MA Baoguo;ZHAO Hechuang;TAN Hongbo(School of Material Science and Engineering,Hubei University,Wuhan 430062,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]湖北大学材料科学与工程学院,武汉430062 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《功能材料》2018年第8期8131-8135,8142,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51772227);硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金资助项目(SYSJJ2017-15)

摘　　要：研究了纳米CaCO_3(NC)对硫铝酸盐水泥(SAC)凝结时间、抗压强度、水化热、水化产物和微观形貌的影响。结果表明,NC可促进SAC的凝结,缩短初凝和终凝时间间隔;显著提高SAC各龄期的抗压强度;缩短SAC的水化诱导期,使水化第一、第二放热峰值分别提高了15.4%和18.9%,并增加了水化放热量;NC在SAC结构中起微集料成核效应和填充效应,提高了水化产物钙矾石(AFt)的结晶度,从而促进SAC的凝结和水化,并使硬化浆体呈整体化的均匀致密结构,提高了SAC净浆的强度。The influences of nano-CaCO3 on setting time,compressive strength,hydration heat,hydration products and micro-morphology of sulphoaluminate cement were studied.The test results show that when nano-CaCO3 was added into sulphoaluminate cement paste,the setting process of sulphoaluminate cement is accelerated,the interval of initial and final setting time is shortened,and the compressive strength is remarkably improved.The hydration induction period is shortened,the acceleration period begins immediately and the first and second peak value of hydration heat is increased by 15.4% and 18.9 respectively.The amount of hydration heat is also increased by adding nano-CaCO3.In the system of sulphoaluminate cement,the micro-aggregate filling effect and nucleation effect of nano-CaCO3 increase the crystallinity of ettringite,thereby the setting and hydration of SAC are promoted.Adding nano-CaCO3 into sulphoaluminate cement system can make hardened cement paste more integral,symmetrical and compact,and improve the strength of sulphoaluminate cement slurry.

关 键 词：硫铝酸盐水泥 纳米CACO3 水化硬化 钙矾石 微集料效应 

分 类 号：TU528.0[建筑科学—建筑技术科学]