【作者】 丁庆军； 弓子成； 黄修林； 胡曙光；

【Author】 GONGZicheng,DING Qingjun,WANGYu,ZHUYuxue,HUANG Xiulin (School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

【机构】 武汉理工大学材料科学与工程学院；

【摘要】 通过水化热测量研究了不同聚羧酸减水剂掺量、分子结构对胶凝材料水化放热过程的影响。结合固体高分辨率29SiNMR测试技术,分析了水化温度对胶凝材料水化产物C-S-H凝胶聚合程度的影响机理。结果表明:掺入聚羧酸减水剂能不同程度地延缓胶凝体系的水化放热过程,降低放热量;高温(50℃、80℃)养护能够显著促进C-S-H凝胶硅氧四面体的聚合程度,增加C-S-H凝胶中铝氧四面体的比例。更多还原

【Abstract】 The effects of different content of superplasticizersN molecular structure and hydration temperature on the hydration heat evolution process of cementitious material were investigated through direct hydration heat measurement.Combined with High-resolution solid 29Si NMR to analyse hydration temperature on the aggregate states of hydration products C-S-H gels of cementitious material.The results show that incorporation of polycarboxylate superplasticizer into cementitious material can more or less delay the hydration heat evolution process of cementitious material,reduce the heat release;maintenance at high temperatures(50℃,80℃) hardened pastes could increase silicon-oxy tetrahedron aggregate states of C-S-H gels and contents of aluminum-oxy tetrahedron.更多还原