Utilization of Recycled Coarse Aggregate in Concrete Mixes

作     者：Akmal Abdelfatah Sami Tabsh Sherif Yehia 

作者机构：Civil Engineering Department American University of Sharjah UAE 

出 版 物：《Journal of Civil Engineering and Architecture》 (土木工程与建筑（英文版）)

年 卷 期：2011年第5卷第6期

页      码：562-566页

摘      要：In this paper, the effect of the source of recycled coarse aggregate on the properties of concrete is investigated. The tests were conducted on concrete made from three sources of recycled aggregates: (1) old concrete with unknown strength, (2) old concrete with a known compressive strength of 21 MPa, and (3) old concrete with a known strength of 42 MPa. The three sources of recycled aggregates were used to produce new concrete with a target compressive strength of 21 MPa. The first and third sources of recycled aggregates were used in producing concrete with target strength of 42 MPa. A control mix was designed with aggregates from natural sources. The research included two methods of making recycled concrete. One concrete mix was produced using the recycled aggregate and adding more water than the control mix, to reach the target slump, while the second concrete mix was produced using the same amount of water as the control mix but with additional superplasticizer to maintain the target slump. The results obtained in this research showed that the concrete compressive strength depends on the source of recycled aggregates; the stronger the source of recycled aggregate, the higher the compressive strength of the produced concrete. Furthermore, the compressive strength of the first concrete mix was about 10%-20% lower than the compressive strength of the control mix. However, when superplasticizers were used, the compressive strength was around the same value as the control mix.

主 题 词：混凝土混合料 再生粗骨料 混凝土抗压强度 控制结构设计 混凝土配合比 混凝土生产 循环再造 再生骨料 

学科分类：08[工学] 081304[081304] 0805[工学-能源动力学] 080502[080502] 0813[工学-化工与制药类] 

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