Compressive behavior of compound concrete containing demolished concrete lumps and recycled aggregate concrete
Compressive behavior of compound concrete containing demolished concrete lumps and recycled aggregate concrete
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DOI：
10.1016/j.conbuildmat.2020.121624
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发表时间：
2021-01-21
影响因子：
7.4
通讯作者：
Wu, Bo
中科院分区：
文献类型：
--
作者：
Jian, Si-Min;Wu, Bo
提出了同时利用粗碎破碎混凝土块（DCLs）和再生粗骨料（RAs）来提高混凝土中废弃物总含量的方法。研究了DCL与再生骨料混凝土（RAC）复合配制的再生块石混凝土（RLAC）的抗压性能。此外，还利用压汞法和扫描电镜对DCL/RAC界面过渡区进行了微观研究。结果显示：（a）在工程实践中，RLAC中的垃圾总量可以达到RAC的2倍以上，（B）在RAC的抗压强度基本不变的情况下，只有RA取代率为100%的RLAC的抗压强度相对较低，（c）当RLAC中的垃圾总量达到54.6%时，仍能达到令人满意的抗压强度;当RA取代率为100%时，DCL周围新拌砂浆的孔隙率和有害孔隙显著增加。(C)2020爱思唯尔有限公司版权所有。
Reusing coarsely crushed demolished concrete lumps (DCLs) and recycled coarse aggregates (RAs) simultaneously is proposed as a way to improve the total waste content in concrete. The compressive behaviour of compound concrete containing DCLs and recycled aggregate concrete (RAC), which referred to as recycled lump/aggregate concrete (RLAC), was experimentally investigated. In addition, mercury intrusion porosimetry and scanning electron microscope were employed to investigate the interfacial transition zone between DCLs and RAC at the micro level. The results revealed that: (a) the total waste content in RLAC can reach more than twice that in RAC in engineering practice; (b) when the compressive strength of RAC stays almost unchanged, only the compressive strength of RLAC containing RAC with 100% RA replacement ratio is relatively much lower; (c) satisfactory compressive strength can still be attained even when the total waste content in RLAC reaches 54.6%; and (d) when the RA replacement ratio is 100%, the porosity and harmful pores in the fresh mortar surrounding DCLs increase remarkably. (C) 2020 Elsevier Ltd. All rights reserved.