亚硝酸钙对硫铝酸盐水泥水化硬化过程的影响  

Influence of calcium nitrite on hydrating and hardening process of sulphoaluminate cement

作　　者：赵河闯 朱艳超[1] 李恩 马保国[2] 谭洪波[2] 李相国[2] ZHAO Hechuang;ZHU Yanchao;LI En;MA Baoguo;TAN Hongbo;LI Xiangguo(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,湖北武汉430062 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070

出　　处：《湖北大学学报（自然科学版）》2020年第3期284-288,共5页Journal of Hubei University：Natural Science

基　　金：国家自然科学基金(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(SYSJJ2017-15)资助。

摘　　要：利用维卡仪、水化热、XRD和DTG等测试手段,研究亚硝酸钙(Ca(NO2)2)对硫铝酸盐水泥(SAC)初凝时间和终凝时间、力学性能、水化放热速率及水化产物的影响.结果表明:当亚硝酸钙的质量掺量为1.2%时,可显著缩短初凝时间和终凝时间,加快硫铝酸盐水泥的凝结;明显提高硫铝酸盐水泥早期的抗压强度,对后期抗压强度的提高幅度较小,标准养护条件下1 d和28 d抗压强度分别提高25.0%和6.1%;使水化第一、第二放热峰值分别提高35.9%和34.3%,并增加水化放热量;亚硝酸钙的溶解改善硫铝酸盐水泥浆体系统的水化环境,有利于水化产物钙矾石(AFt)的结晶,从而促进水化并提高抗压强度.The influence of calcium nitrite on setting time,compressive strength,hydration heat and hydration products of sulphoaluminate cement were studied by Vicat apparatus,heat of hydration,XRD,and DTG.The test results show that when 1.2%mass calcium nitrite was added into sulphoaluminate cement paste,the setting process of sulphoaluminate cement is substantially accelerated,the interval of initial and final setting time is shortened,and the compressive strength is remarkably improved at early stage,but not obviously at later stage.The compressive strength of cement pastes at 1 d and 28 d increased by 25.0%and 6.1%,respectively.The first and second exothermic peaks of hydration increased by 35.9%and 34.3%,respectively,and the hydration heat was increased.The dissolution of calcium nitrite improved the alkalinity of the sulphoaluminate cement slurry system,which was beneficial to the crystallization of the hydrated ettringite(AFt),thus promot the hydration process and increased the compressive strength.

关 键 词：硫铝酸盐水泥 亚硝酸钙 水化过程 水化产物 钙矾石 

分 类 号：O69[理学—化学] TU528.041[建筑科学—建筑技术科学]