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基于图像分析和非蒸发水量的复合胶凝材料的水化程度的定量分析
作者:阎培渝 韩方晖 
单位:清华大学土木工程系 土木工程安全与耐久教育部重点实验室 北京 100084 
关键词:复合胶凝材料 水化 图像分析 扫描电子显微镜 能谱仪 非蒸发水量 反应程度 
分类号:TQ172.11
出版年,卷(期):页码:2015,43(10):1331-1340
DOI:10.14062/j.issn.0454-5648.2015.10.04
摘要:

 定量确定复合胶凝材料中的水泥与矿物掺合料的反应程度对于研究它们的反应机理和微观结构发展非常重要。采用扫描电镜观察结合能谱分析,确定了在2045 60 水化的复合胶凝材料中的水泥、矿渣粉或粉煤灰的反应程度。用灼烧失重法测定了复合胶凝材料浆体的非蒸发水量。结果表明:水化温度对于水泥的水化程度影响很小。在实验温度范围内,水泥-矿渣粉复合胶凝材料中的水泥的反应程度随着矿渣粉含量的增加而提高;但是水泥-粉煤灰复合胶凝材料中的水泥的反应程度在高温时低于纯水泥的反应程度。水化温度的提高降低了水泥的反应程度,但提高了矿渣粉或粉煤灰的反应程度。复合胶凝材料的反应程度随着矿物掺合料掺加比例的提高而降低。复合胶凝材料的反应程度与其非蒸发水量之间存在线性关系。

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 It is important to clarify the hydration mechanism and microstructure development of cement and mineral admixture in thepresence of composite binder via the quantitative determination of their reaction degrees. The reaction degrees of cement, slag or flyash in composite binder hydrating at 20, 45 and 60 were determined by using scanning electron microscopy with energydispersive spectrometry. The non-evaporable water content of pastes was determined by ignition loss. The results show thattemperatures have little effect on the final reaction degree of Portland cement. The reaction degree of cement in binders containingslag increases with increasing slag content in the range of testing temperature, but it is lower in binders containing fly ash thanPortland cement at elevated temperature. The increase of temperature decreases the reaction degree of cement in composite binder,but increases the reaction degrees of slag and fly ash. The reaction degree of composite binder decreases with the increase of replacingratio of mineral admixture. A linear relationship between the non-evaporable water content and the reaction degree of compositebinder was proposed.

基金项目:
国家自然科学基金 (U1134008, 51278277) 资助项目。
作者简介:
第一作者:阎培渝,教授。
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