Application of internal curing for mixtures containing high volumes of fly ash
Application of internal curing for mixtures containing high volumes of fly ash
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DOI：
10.1016/j.cemconcomp.2012.06.008
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发表时间：
2012-10-01
影响因子：
10.5
通讯作者：
Weiss, Jason
中科院分区：
文献类型：
--
作者：
De la Varga, Igor;Castro, Javier;Weiss, Jason
本文着重于测试混合物，将是一致的混凝土桥面混合物的砂浆部分，许多国家的交通部门进行。在这项工作中，相对较大百分比的水泥（40%，60%或80%体积）被C级粉煤灰取代。为了克服通常用高体积粉煤灰混合物（HVFA）表示的与慢凝固和早期强度发展相关的问题，水与胶凝材料的质量比（w/cm）已从常规值0.42降低至0.30。为了克服潜在的并发症，低w/cm可能会导致自干燥，内部养护（IC）与预湿轻骨料被用来减少收缩和增加水化。通过采用这种方法（降低w/c和使用IC）IC HVFA混合物显示出额外的好处，应该允许其更广泛的应用。(c)2012爱思唯尔有限公司保留所有权利。
This paper focuses on testing performed on mixtures that would be consistent with the mortar portion of a concrete bridge deck mixture for many state departments of transportation. In this work a relatively large percentage of cement (40%, 60%, or 80% by volume) is replaced with Class C fly ash. To overcome concerns associated with slow set and early-age strength development that are often expressed with the high volume fly ash mixtures (HVFA), the water-to-cementitious materials ratio (w/cm) by mass has been reduced from a conventional value of 0.42 to 0.30. To overcome potential complications that the low w/cm may cause in terms of self-desiccation, internal curing (IC) with prewetted lightweight aggregate was used to reduce shrinkage and increase hydration. By adopting this approach (lowering the w/c and using IC) IC HVFA mixtures show additional benefits that should permit their broader application. (c) 2012 Elsevier Ltd. All rights reserved.