The influence of alkali–silica reaction (ASR) gel composition on its hydrophilic properties and free swelling in contact with water vapor
The influence of alkali–silica reaction (ASR) gel composition on its hydrophilic properties and free swelling in contact with water vapor
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DOI：
10.1016/j.cemconres.2017.01.006
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发表时间：
2017-04
影响因子：
11.4
通讯作者：
Asghar Gholizadeh-Vayghan;F. Rajabipour
中科院分区：
文献类型：
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作者：
Asghar Gholizadeh-Vayghan;F. Rajabipour
制备了具有 20 种不同化学成分（类似于现场混凝土中的化学成分）的合成 ASR 凝胶，并研究了成分（即 Ca/Si、Na/Si 和 K/Si）对其亲水和膨胀行为的影响。浇铸迷你棒凝胶样品并进行测试，以测量凝胶暴露于 95% RH 时的自由溶胀应变和重量变化。还测量了凝胶的平衡相对湿度（ERH）以评估其亲水潜力。结果表明，较高的 Na/Si 和 K/Si 会增加凝胶的自由溶胀和吸水率，并降低其 ERH。 Ca/Si 对凝胶的溶胀和吸水率表现出多阶段效应，但对其 ERH 没有显着影响。提供了对观察到的效果的讨论，并开发了用于预测凝胶的溶胀和亲水特性的回归模型。
Synthetic ASR gels with 20 different chemical compositions similar to those found in field concretes were produced, and the effects of composition (i.e., Ca/Si, Na/Si and K/Si) on their hydrophilic and swelling behavior were investigated. Minibar gel specimens were cast and tested for time dependent measurement of the free swelling strain and weight change of the gels when exposed to 95% RH. The equilibrium relative humidity (ERH) of the gels was also measured for assessing their hydrophilic potential. The results suggest that higher Na/Si and K/Si increase the free swelling and water absorption of the gels, and reduce their ERH. Ca/Si showed a multi–episode effect on the swelling and water absorption of the gels, while showing no significant effect on their ERH. Discussions on the observed effects are provided and regression models for predicting the swelling and hydrophilic properties of the gels are developed.