Effectiveness of fly ash on the restrained shrinkage cracking resistance of self-compacting concrete
Effectiveness of fly ash on the restrained shrinkage cracking resistance of self-compacting concrete
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DOI：
10.1016/j.cemconcomp.2017.01.010
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发表时间：
2017-05-01
影响因子：
10.5
通讯作者：
Badran, Deena
中科院分区：
文献类型：
--
作者：
Altoubat, Salah;Junaid, M. Talha;Badran, Deena
本文介绍了约束收缩试验的结果，以评估粉煤灰对自密实混凝土（SCC）开裂和松弛行为的有效性。具体讨论了粉煤灰掺量、抑制程度和养护制度对粉煤灰掺量的影响。结果表明，养护条件和约束程度对FA对SCC混合料的开裂和松弛行为的影响显著。与对照相比，FA的加入提高了SCC的抗裂性能和松弛性能。结果进一步表明，只要采用适当的湿养护，FA在低约束条件下可替代水泥达50%，在高约束条件下可替代水泥达35%，且抗裂性能显著提高。所提出的归一化结果也可能被证明是设计最适合现场条件的混合料的重要工具。(C) 2017 Elsevier Ltd.版权所有。
This paper presents results from restrained shrinkage tests to assess the effectiveness of fly ash on cracking and relaxation behavior of Self Compacting Concrete (SCC). The effects of fly ash (FA) proportion, degree of restraint and curing regime are specifically addressed. The results show that curing condition and degree of restraint play a significant role on the effectiveness of FA on the cracking and relaxation behavior of SCC mixes. It was also found that addition of FA improves the cracking resistance and relaxation behavior of SCC relative to the control. The results further suggest that FA can replace cement by up to 50% for low degree of restraint, and up to 35% for high degree of restraint with significant improvement in cracking resistance, provided that appropriate moist curing is adopted. The normalized results presented may also prove to be an important tool in devising mixes best suited for onsite conditions. (C) 2017 Elsevier Ltd. All rights reserved.