电阻率法研究快硬硫铝酸盐水泥的水化过程  

Research on Hydration of Rapid Hardening Sulphoaluminate Cement Using an Electrical Resistivity Method

作　　者：廖宜顺[1,2] 李国卫[1,2] 魏小胜[1,2] 

机构地区：[1]华中科技大学土木工程与力学学院,武汉430074 [2]控制结构湖北省重点实验室,武汉430074

出　　处：《武汉理工大学学报》2009年第17期74-77,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50778078)

摘　　要：采用无电极电阻率测定仪测定了不同水灰比的水泥净浆在1 440 min内的电阻率变化曲线,研究了快硬硫铝酸盐水泥的水化过程。研究表明,快硬硫铝酸盐水泥的电阻率变化曲线在凝结硬化后出现了2个峰值,其原因是钙矾石(AFt)与单硫型水化硫铝酸钙(AFm)发生了相互转变。快硬硫铝酸盐水泥在凝结硬化前,影响电阻率的决定性因素是孔隙率,而凝结硬化后的决定性因素是液相电阻率。当水灰比逐渐增大时,初始电阻率逐渐减小,电阻率变化曲线的第2个峰的峰值逐渐增大,1 d电阻率也逐渐增大,1 d抗压强度逐渐降低。The electrical resistivities within 1 440 minutes of cement pastes with different water to cement ratios were measured by a non-contacting electrical resistivity meter. The hydration behavior of rapid hardening sulphoaluminate cement was revealed. The results show that the curve of resistivity occurs two peaks after setting and hardening and the reason is that ettringite （AFt） can convert into monosulfate （AFm） and vice versa. The critical factor which impacts the resistivity is porosity before setting and hardening and electrical resistivity of liquid after setting and hardening. An increase of water to cement ratio causes a decrease of the initial resistivity and the compressive strength at one day, and an increase of the resistivity at one day and the value of the second peak which occurs in the curve of resistivity.

关 键 词：快硬硫铝酸盐水泥 水化 电阻率 抗压强度 

分 类 号：TQ172[化学工程—水泥工业]