硅酸盐学报Issue(11)：1499-1506,8.DOI:10.7521/j.issn.0454-5648.2013.11.07
石膏种类对硅酸盐-铝酸盐混合水泥强度的影响机理
Influence Mechanism of Calcium Sulfate Variety on Strength of Portland Cement-calcium Aluminate Cement Blends
摘要
Abstract
The influence mechanism of calcium sulfate varieties on the strength of Portland cement-calcium aluminate cement blends were investigated by means of calorimetry, X-ray diffraction, environmental scanning electron microscopy. Results show that the variety of calcium sulfate determines its solubility and dissolution rate, which directly lead to the differences in the formation content, time and size of ettringite (AFt), and affects the volume stability, which finally determines the strength of pastes. When the calcium sulfate dosage is 7.5%, the formation content of AFt firstly increases and then decreases. However, the time when AFt content reaches the maximum and the size of AFt have close relationships with the variety of calcium sulfate. When anhydrite is added, the transit time from AFt to monosulfate is the latest, and the size of AFt is much longer and thinner than those with other calcium sulfate, addi-tionally the AFt content before 8 hours is prominently lower than others, which leads to lower strength. When the calcium sulfate dosage is 15%, secondary gypsum also forms besides AFt, is ten times bigger than AFt. This can lead to the expansion and even com-plete lost of strength for the systems with hemi-hydrite.关键词
硅酸盐-铝酸盐混合水泥/无水石膏/半水石膏/二水石膏/强度/钙矾石Key words
Portland cement-calcium aluminate cement blends/anhydrate/hemi-hydrite/gypsum/strength/ettringite分类
化学化工引用本文复制引用
徐玲琳,王培铭,张国防,Geert de SCHUTTER..石膏种类对硅酸盐-铝酸盐混合水泥强度的影响机理[J].硅酸盐学报,2013,(11):1499-1506,8.基金项目
国家“十二五”科技支撑计划(2012BA20B02)；国家自然科学基金(51102182)资助。 （2012BA20B02）
