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水泥砂浆的早龄期热膨胀系数的时变特征
作者:江晨晖1 2 杨杨3 李鹏4 王晓栋5 马成畅3 
单位:1. 浙江工业大学化工工程与材料学院 杭州 310014 2. 浙江建设职业技术学院建筑工程系 杭州 311231 3. 浙江工业大学建筑工程学院 杭州 310014 4. 杭州信达投资咨询估价监理有限公司 杭州 310007 5. 杭州建工建材有限公司 杭州 311107 
关键词:水泥基材料 热膨胀系数 早龄期 自收缩 低温区间 
分类号:TU528;TB321
出版年,卷(期):页码:2013,41(5):0-605
DOI:
摘要:

为了测定水泥基材料的早龄期热膨胀系数,并揭示和把握其时变特征、影响因素,通过自行设计的实验方法抑制早龄期胶凝材料的水化和自收缩的发生,获得水泥砂浆的单纯温度变形随测试温度变化的规律,从而求得热膨胀系数,进而以水化龄期为参数获得热膨胀系数的时间依存特征。结果表明:以–2~3 ℃作为测试变温区间能有效抑制水泥的水化进程和自收缩,从而获得砂浆的单纯温度变形;砂浆的早龄期热膨胀系数随龄期增加的变化表现为急剧下降、缓慢回升和持续稳定3个基本阶段;随着水泥用量的减少和水灰比的提高,砂浆的热膨胀系数特征值(最大值、最小值和稳定值)增大。
 

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The time dependence on the thermal expansion coefficient (αT) of cement-based materials at early ages was analyzed by a self-designed testing method, and the αT at different ages was determined. In the method, the hydration and autogenous shrinkage of cementitious materials were controlled with a low temperature range. The results show that the hydration process and autogenous shrinkage are controlled effectively in the range of –2 to 3 ℃, assuring the measured deformation as a pure thermal deformation. There are three phases of the mortars′ αT that change with age, i.e., sharply decreasing phase, slowly increasing phase and continuously stable phase. The characteristic values (i.e., the maximum, minimum and stable values) of the mortars′ αT increased with the decrease of cement content and the increase of water-cement ratio.
 

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基金项目:
国家自然科学基金项目(50979098)资助项目。
作者简介:
第一作者:江晨晖(1981—),男,博士研究生,讲师。 通信作者:杨 杨(1962—),男,博士,教授。
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