Influence of atmospheric steam curing by solar energy on the compressive and flexural strength of concretes
Influence of atmospheric steam curing by solar energy on the compressive and flexural strength of concretes
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DOI：
10.1016/j.conbuildmat.2013.08.085
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发表时间：
2013-12-01
影响因子：
7.4
通讯作者：
Guettala, Salim
中科院分区：
文献类型：
--
作者：
Benammar, Benkhadda;Mezghiche, Bouzidi;Guettala, Salim
本文研究了太阳能常压蒸汽养护对预制构件混凝土抗压和抗折强度的影响。进行了一项实验计划，并行研究水/水泥比（0.4，0.5和0.6）的影响，水泥类型的影响和养护方法的影响（四种养护方法：水养护，空气养护，蒸汽养护在29摄氏度和蒸汽养护在45摄氏度）对混凝土的抗压和抗折强度。研究了由普通波特兰水泥（CEM I 42.5）和复合水泥（CEM II/B 42.5）制成的六种具有相似工作性的配方，每种类型三种。结果使我们能够突出蒸汽养护程序的有益效果，以实现高的抗压和抗弯强度，特别是在早期的固化。然而，在蒸汽固化28天后，在所有样品中观察到强度降低。太阳能蒸汽养护技术是混凝土快速硬化、强度高、节约电能的有效技术。我们可以说，在水化反应过程中，抗压强度的增加伴随着抗弯强度的增加。通过这些结果，对于两种类型的水泥和不同的水灰比，在一天的蒸汽养护和3天的自由空气中硬化后，在自由空气中28天达到抗压强度的时间增加，制造周期缩短。爱思唯尔有限公司出版
In this paper, influence of atmospheric steam curing by solar energy on the compressive and flexural strength of concretes for precast elements was investigated. An experimental program was carried out to studying in parallel the effect of water/cement ratio (0.4, 0.5 and 0.6), the influence of cement type and the influence of curing methods (four methods of curing were used: water curing, air curing, steam curing at 29 degrees C and steam curing at 45 degrees C) on the compressive and flexural strength of concretes. Six formulations of similar workability made from ordinary Portland cement (CEM I 42.5) and a composite cement (CEM II/B 42.5) three of each type are studied. The results allow us to highlight the beneficial effect of a steam curing procedure to achieve high compressive and flexural strength, especially in the earlier ages of curing. However, after 28 days of steam curing, a strength reduction was observed in all samples. The technique of steam curing by solar energy is an effective technique for accelerated hardening of concretes, for a good strength and high electrical energy saving for precast concretes production. We can say that the increased compressive strength during the progress of the reaction of hydration is accompanied by an increase in flexural strength. Through the results obtained a gain of time and shorter manufacturing lead times to reach the compressive strength at 28 days in the free air after a one day steam curing and 3 days of hardening in the free air for the two types cement and the different w/c ratios. Published by Elsevier Ltd.