低温养护下硫铝酸盐水泥的水化进程及强度发展王培铭.pdfVIP

第 45 卷第 2 期 硅 酸 盐 学 报 Vol. 45 ，No. 2 2 0 1 7 年 2 月 JOURNAL OF THE CHINESE CERAMIC SOCIETY February ，2017 DOI ：10.14062/j.issn.0454-5648.2017.02.10 低温养护下硫铝酸盐水泥的水化进程及强度发展 王培铭，李 楠，徐玲琳，张国防 (先进土木工程材料教育部重点实验室，同济大学材料科学与工程学院，上海 200092) 摘 要：研究了 0、5 ℃和20 ℃养护下硫铝酸盐水泥的水化产物、水化程度及强度发展。结果表明：低温(0 ℃和 5 ℃)养护 延缓了硫铝酸盐水泥的水化，早期水化程度大幅减小，并出现二水石膏结晶；但 2~3 d 期间水化程度出现显著增长，二水石 膏也被完全消耗。低温养护未阻碍水化反应的持续快速进行，也未改变水化产物的种类，但对其数量产生影响。抗压强度的 发展规律与水化程度基本一致，低温养护下 1 d 的抗压强度显著降低，但后期增长明显，5 ℃养护28 d 的抗压强度甚至超过 20 ℃的。早期抗压强度的发展主要受制于水泥的水化速率和水化程度，后期的增长则更多地取决于主要水化产物的量变和微 观结构的发展。 关键词：硫铝酸盐水泥；低温养护；水化程度；抗压强度；水化产物；微观结构 中图分类号：TQ172.75 文献标志码：A 文章编号：0454–5648(2017)02–0242–07 网络出版时间：2017-01-18 21:53:40 网络出版地址：/kcms/detail/11.2310.TQ2153.002.html Hydration Characteristics and Strength Development of Sulphoaluminate Cement Cured at Low Temperature WANG Peiming, LI Nan , XU Linglin , ZHANG Guofang (Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 200092, China) Abstract: The hydrate assemblage, hydration degree and compressive strength development of calcium sulphoaluminate cement pastes cured at 0, 5 ℃ and 20 ℃ were investigated. The results indicate that the hydration process is significantly delayed by the low temperature (0 ℃ and 5 ℃) curing, decreasing the degree of hydration in the early ages. Meanwhile, formation of gypsum is detected. However, the hydration degree increases significantly during 2–3 d, along with the completely consumption of gypsum. Neither the rapid hy