Experimental study on interior relative humidity development in early-age concrete mixed with shrinkage-reducing and expansive admixtures
Experimental study on interior relative humidity development in early-age concrete mixed with shrinkage-reducing and expansive admixtures
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掺减缩膨胀剂的早龄混凝土内部相对湿度变化试验研究
DOI：
10.1016/j.conbuildmat.2019.117204
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发表时间：
2020-01
影响因子：
7.4
通讯作者：
Xiaodong Chen
中科院分区：
文献类型：
--
作者：
SHUO CHEN;Haitao Zhao;Yu Chen;Donghui Huang;Yuzhi Chen;Xiaodong Chen
早龄期混凝土在自干燥过程中，由于室内相对湿度(RH)的降低而导致的体积收缩，可能会产生裂缝。使用减缩剂(SRAS)和膨胀剂(EAs)来缓解体积收缩。利用自行研制的无线自动相对湿度监测系统，对混凝土试件内相对湿度进行了一系列的测量实验。系统分析了不同掺量的聚合型SRA和CaO-EA对早龄期混凝土的凝结时间、临界时间和内部RH发展的影响。在此基础上，建立了考虑水胶比、SRA和EA用量影响的临界时间模型和两阶段RH发展模型。两种模型均与实验数据吻合较好。
Early age concrete may crack due to volumetric shrinkage caused by a decrease in the interior relative humidity (RH) in the self-desiccation process. Shrinkage-reducing admixtures (SRAs) and expansive admixtures (EAs) are utilized to mitigate the volumetric shrinkage. Using a self-developed wireless and automatic relative-humidity monitoring system, a series of experiments for the measurement of the RH within concrete specimens was conducted. A systematic analysis was conducted in the aspects of the setting time, critical time and interior RH development in early-age concrete with different dosages of the polymer-type SRA and CaO-type EA. On the basis, a critical time model and a two-stage RH development model considering the effects of the water to binder ratio, SRA and EA dosages were established. Both of the models are in good agreement with the experimental data.
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