| 摘要: |
| 利用固体核磁共振硅谱（29Si NMR）和显微硬度计，定量表征了轻集料水泥石界面区的水化程度、水化硅酸钙（C S H）凝胶聚合度和力学性能，研究了轻集料吸水率对轻集料水泥石界面区力学性能和C S H凝胶微结构的影响规律，并以此验证了预湿轻集料的内养护效应.结果表明：轻集料水泥石界面区的水化程度、C S H凝胶聚合度和显微硬度均高于水泥石基体；轻集料吸水率越大，轻集料水泥石界面区的水化程度、C S H凝胶聚合度和显微硬度越高，预湿轻集料的内养护作用越明显. |
| 关键词: 轻集料 吸水率 界面区 显微硬度 C S H凝胶 |
| DOI：103969/j.issn1007 9629201805004 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51402003)；安徽建筑大学安徽省先进建筑材料重点实验室开放课题(JZCL201601ZZ)；国家重点研发计划“重点基础材料技术提升与产业化”专项课题(2017YFB0310001) |
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| Influence of Water Absorption Ratio of Lightweight Aggregate on Characteristics of Interfacial Transition Zone between Lightweight Aggregate and Cement |
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ZHANG Gaozhan1, WEI Qi1, DING Qingjun2, ZHANG Xiaojia1
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1.Advanced Building Materials Key Laboratory of Anhui Province, Anhui Jianzhu University, Hefei 230022, China;2.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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| Abstract: |
| The hydration degree and mechanical property of paste and the polymerization of C S H gel in interfacial transition zone(ITZ) between lightweight aggregate and cement were quantitatively characterized by solid state 29Si magic angle spinning nuclear magnetic resonance(29Si NMR) and microhardness tester. The influence of water absorption ratio of lightweight aggregate on mechanical property of paste and microstructure of C S H gel in ITZ was investigated, and the internal curing effect of pre wetted lightweight aggregate was verified by this method. The results show that the hydration degree and microhardness of paste and the polymerization of C S H gel in ITZ are higher than that of the cement matrix. With increasing water absorption rate of lightweight aggregate, the hydration degree and microhardness of paste and the polymerization of C S H gel in ITZ increase, the internal curing effect of pre wetted lightweight aggregate is improved. |
| Key words: lightweight aggregate water absorption ratio interfacial transition zone(ITZ) microhardness C S H gel |
