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Combined use of recycled powder and recycled coarse aggregate derived from construction and demolition waste in self-compacting concrete

机译：结合使用从施工和拆除废物中的再生粉末和再生粗骨料在自压缩混凝土中

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摘要

This study aims to investigate the properties of self-compacting concrete (SCC) with a combined use of recycled coarse aggregate (RCA-0, 25%, 50% and 100% replacement by mass) and recycled powder (RP-10% and 20%), which were both derived from construction and demolition (C&D) waste. Fresh properties were conducted as per EFNARC and porosity was evaluated by using a non-destructive test technique micro X-ray Computer Tomography (X-ray CT). The results showed that SCC mixtures examined in this study all owed excellent flow-ability even when FA was fully replaced with RP. The compressive strength, splitting tensile strength and the resistance to chloride penetration of SCC generally weakened with an increase in the RCA replacement, and the rate of reduction was generally lower when RCA was used no more than 50%. X-ray CT results showed that a higher amount of RP can lead to agglomeration of particles that lead to higher porosity in concrete, which may attribute to the poor durability of SCC with RCA and RP. (C) 2020 Elsevier Ltd. All rights reserved.
机译：本研究旨在研究自压制混凝土（SCC）的性能，结合使用再生粗骨料（RCA-0,25％，50％和100％按质量置换）和再循环粉末（RP-10％和20 ％），其源自施工和拆除（C＆D）废物。根据EFNARC进行的新鲜特性，通过使用非破坏性测试技术微X射线计算机断层扫描（X射线CT）来评估孔隙率。结果表明，在本研究中检测的SCC混合物所有欠流量，即使FA完全用RP完全替换。压缩强度，分裂拉伸强度和对氯化物渗透的抗性的耐氯气通常随着RCA替代的增加而削弱，并且当使用RCA不超过50％时，减少速率通常较低。 X射线CT结果表明，较高量的RP可以导致颗粒的聚集，导致混凝土中较高的孔隙率，这可能归因于SCC与RCA和RP的耐久性。 （c）2020 elestvier有限公司保留所有权利。

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