Rheology and strength of concrete made with recycled concrete aggregates as replacement of natural aggregates

IF 0.5 Q4 MATERIALS SCIENCE, COMPOSITES
Z. Tahar, B. Benabed, E. Kadri, Tien-Tung Ngo, A. Bouvet
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引用次数: 3

Abstract

This paper presents the results of an experimental study carried out to evaluate the influence of the nature and the content of the recycled fine and coarse aggregates from concrete construction and demolition wastes on the rheological and strength properties of concrete. For this purpose, concretes mixtures were made with different percentages (15, 30, 50, 70 and 100%) of recycled sand and recycled gravel. Three different cement / admixture ratios were used. At fresh state, tests applied include slump, yield stress, plastic viscosity, air content and fresh density. Moreover, in order to follow the evolution of these properties over time, the tests were carried out at different times: directly after mixing, 30 minutes, 60 minutes and 90 minutes after completion of the mixing). At hardened state, compressive strength was determined at age of 7 and 28 days. The results show that, the properties of the concretes made with recycled aggregates depend up on the cement / admixture ratio and the substitution level of recycled aggregates. This means that there is indeed an influence of the recycled aggregates on the compatibility (physicochemical equilibrium) of the cement / admixture ratio. This influence is more noticeable on the sand than on the gravel. The results also show that, increasing the percentage of substitution of recycled aggregates in concrete mixture increases the yield stress and the plastic viscosity of fresh concrete. However, a decrease in the compressive strength was found with increasing the content of recycled aggregate.
用再生混凝土骨料代替天然骨料制成的混凝土流变学和强度
本文介绍了一项试验研究的结果,以评估从混凝土建筑和拆除废物中回收的细骨料和粗骨料的性质和含量对混凝土流变学和强度性能的影响。为此,混凝土混合物采用不同比例(15%、30%、50%、70%和100%)的再生砂和再生砾石。使用了三种不同的水泥/外加剂比例。在新鲜状态下,应用的测试包括坍落度、屈服应力、塑性粘度、空气含量和新鲜密度。此外,为了跟踪这些性能随时间的变化,在不同的时间进行了测试:混合后直接,混合完成后30分钟,60分钟和90分钟)。在硬化状态下,分别在7天和28天测定抗压强度。结果表明,再生骨料混凝土的性能取决于水泥/外加剂比和再生骨料的替代水平。这意味着再生骨料确实对水泥/外加剂比的相容性(物理化学平衡)有影响。这种影响在沙子上比在砾石上更明显。结果还表明,增加再生骨料在混凝土混合料中的替代率,会增加新拌混凝土的屈服应力和塑性粘度。但随着再生骨料掺量的增加,抗压强度有所下降。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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18
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12 weeks
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