Experimental study on water absorption of unsaturated concrete: w/c ratio, coarse aggregate and saturation degree
Experimental study on water absorption of unsaturated concrete: w/c ratio, coarse aggregate and saturation degree
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非饱和混凝土吸水率试验研究：水灰比、粗骨料和饱和度
DOI：
10.1016/j.conbuildmat.2020.121945
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发表时间：
2021-02-22
影响因子：
7.4
通讯作者：
Zhang, Chunxiao
中科院分区：
文献类型：
--
作者：
Yang, Lin;Liu, Guojian;Zhang, Chunxiao
更好地了解混凝土中的水运输对于评估耐用性和预测使用寿命具有重要意义。在这项研究中，研究了水水泥比（w/c）的影响，粗骨料（V-A）的体积分数和粗骨料的粒径对混凝土吸水的粒径。此外，对饱和度（Theta）对混凝土吸水的影响更加关注。结果表明，吸水过程可以分为两个阶段：快速吸收和稳定的吸收。吸水率随着混凝土的W/C增加而增加。 V a的增加减少了混凝土的吸水。但是，粗骨料的粒径对不饱和混凝土的吸水没有影响。吸水的初始速率随着混凝土饱和度的增加而降低。根据实验结果，建立了用于预测具有任何饱和度的混凝土吸水率的模型。因此，可以计算任何饱和度的混凝土吸水率的初始速率。 （c）2020 Elsevier Ltd.保留所有权利。
Better understanding of water transport in concrete is of great significance to assess the durability and predict service life. In this study, effects of water to cement ratio (W/C), volume fraction of coarse aggregate (V-a) and particle size of coarse aggregate on water absorption of concrete were investigated. Besides, more attention was paid to the effect of saturation degree (theta) on water absorption of concrete. The results showed that the process of water absorption can be divided into two stages: rapid absorption and steady absorption. The rate of water absorption increases with the increasing W/C of concrete. An increase of V a reduces the water absorption of concrete; however, the particle size of coarse aggregate has no effect on the water absorption of unsaturated concrete. The initial rate of water absorption decreases with the saturation degree of concrete increasing. According to experiment results, a model for predicting the initial rate of water absorption of concrete with any saturation degree is established. From that, the initial rate of water absorption of concrete with any saturation degree can be calculated. (C) 2020 Elsevier Ltd. All rights reserved.