刘伟佳,樊启祥,李庆斌,杨宁,乔雨,胡昱

• 1:清华大学水沙科学与水利水电工程国家重点实验室
• 2:中国三峡建设管理有限公司

摘要(Abstract)：

研究不同环境温度作用下混凝土坯层间性能的变化规律,对预测施工风险及施工过程中准确控制坯层结合质量具有重要意义。通过测定低热水泥混凝土在不同温度作用下坯层间的劈裂抗拉强度及坯层覆盖时下层混凝土的含水量和贯入阻力,对不同温度作用下低热水泥混凝土坯层间性能劣化机理进行了分析。结果表明:随着温度的升高,低热水泥混凝土的贯入阻力不断增大,表层含水量及劈裂抗拉强度逐渐降低。这主要是与温度影响着坯层间混凝土的水化速率、最终水化程度及上下层骨料间的嵌入程度有关。此外,引入了成熟度理论,建立了基于等效龄期的混凝土坯层间劈裂抗拉强度预测模型,根据该模型可以准确预测混凝土坯层间劈裂抗拉强度,并对坯层间结合质量进行实时预警和控制。

关键词(KeyWords)： 低热水泥混凝土;环境温度;贯入阻力;含水量;坯层间劈裂抗拉强度;等效龄期

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51979145,51839007)

作者(Author): 刘伟佳,樊启祥,李庆斌,杨宁,乔雨,胡昱

DOI: 10.13928/j.cnki.wrahe.2021.02.022

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