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| 水热条件对硅酸盐水泥的水化及其干缩性能的影响 |
| Effect of Hydrothermal Conditions on the Hydration and Drying Shrinkage of Portland Cement |
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| DOI：10.3969/j.issn.1671-5322.2009.04.003 |
| 中文关键词: 硅酸盐水泥 水化 干缩 水热条件 机理 |
| 英文关键词: Portland cement hydration drying shrinkage hydrothermal condition mechanism |
| 基金项目:江苏省生态环境材料重点建设实验室重点学科建设开放基金，江苏省高校自然科学研究指导性计划研究项目 |
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| 中文摘要: |
| 通过强度试验、干缩测定、MIP、TG-DSC、NMR分析,研究了不同水热条件下硅酸盐水泥的早期(3 d)水化及其干缩性能.结果表明:约2 d时间的水养护温度由20 ℃提高到60 ℃,水泥的早期(3 d)水化程度显著提高,C-S-H凝胶数量显著增多,同时C-S-H凝胶的硅酸盐聚合度提高,C-S-H的表面积减小,致密度提高;水泥的3 d强度显著提高,但28 d强度明显下降;水泥的干缩显著减小.养护温度提高减小干缩的原因是由于干燥前C-S-H凝胶的化学结构等发生变化而使水泥的不可逆干缩显著减小. |
| 英文摘要: |
| In different hydrothermal conditions,the hydration and drying shrinkage properties of Portland cement were studied by measuring strength and drying shrinkage(including reversible portion and irreversible portion),and by using MIP,TG-DSC,NMR analysis.Results show that approximately 2 d time water curing,increasing the temperature(from 20 ℃ to 60 ℃),increases the early(3 d) degree of hydration,the quantity of C-S-H gel,the degree of polymerization of hydrated silicates,the density of cement paste,the 3 d strength of Portland cement,and decreases remarkably 28 d strength and drying shrinkage.The reason that 60 curing has lower drying shrinkage is due to the chemical structure changes of C-S-H gel before drying which decreasing remarkably the irreversible shrinkage. |
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