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干燥环境下内养护混凝土收缩、强度及开裂性能 预览 被引量:2

Shrinkage,Strength Development and Cracking of Internally Cured Concrete Exposed to Dry Conditions
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摘要 研究了掺入预湿轻细骨料(粉煤灰陶砂)的内养护混凝土与普通混凝土在不同干燥环境下的收缩和相对湿度发展、质量损失、强度发展及开裂风险.结果表明:当暴露在干燥环境时,内养护混凝土的相对湿度下降速率和总体收缩速率均大于普通混凝土,延长密闭养生时间至28d不能显著降低内养护混凝土的总体收缩;干燥环境下内养护混凝土更易失水,从而降低内养护效率;早龄期暴露于干燥环境下的普通混凝土和内养护混凝土的抗压强度和弯拉强度均显著降低;干燥环境下,内养护技术不能显著提高混凝土的抗开裂性能,但在不与外界发生水分交换的条件下,内养护混凝土未出现开裂.因此,内养护混凝土宜用于大体积混凝土或非表层的结构物混凝土中. Both ordinary and internally cured concretes were investigated under different dry conditions in terms of shrinkage,relative humidity,mass loss,strength development,and cracking risk.Its found that,when exposed to dry condition,the declining of relative humidity and integrated shrinkage of internally cured concrete develops at a faster rate than the ordinary concrete.The result also shows that an extension of sealed curing period of 28 days does not significantly reduce the magnitude of its integrated shrinkage.Internal curing efficiency can be substantially reduced when concrete is exposed to dry condition at early age.The strength of both control and internally cured concretes are very sensitive to exposure conditions,and strength reduction is observed when concrete exposed to dry condition for both compressive and flexural strength.Internal curing does not significantly improve the cracking resistance under external drying condition,but under the condition of sealed curing,the internally cured concrete doesnt develop cracking.Therefore,its best to utilize internally cured concrete in the mass concreting and in the interior as compared to the surface layer of structural concrete.
作者 魏亚 郑小波 郭为强 WEI Ya , ZHENG Xiaobo , GUO Weiqiang (Deparment of Civil Engineering, Tsinghua University, Beijing 100084, China)
出处 《建筑材料学报》 EI CAS CSCD 北大核心 2016年第5期902-908,共7页 Journal of Building Materials
基金 国家自然科学基金资助项目(51578316)
关键词 内养护混凝土 预湿轻细骨料 干燥环境 收缩开裂 强度损失 internally cured concrete pre-wetted lightweight fine aggregate drying condition shrinkage cracking strength loss
作者简介 魏亚(1976-),女,河南驻马店人,清华大学副教授,博士生导师,博士.E-mail:yawei@tsinghua.edu.cn
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