Mechanical and durability properties of recycled aggregate concrete with ternary binder system and optimized mix proportion
Mechanical and durability properties of recycled aggregate concrete with ternary binder system and optimized mix proportion
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DOI：
10.1016/j.jmrt.2020.04.038
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发表时间：
2020-05-01
影响因子：
6.4
通讯作者：
Ovallos-Gazabon, D.
中科院分区：
文献类型：
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作者：
Babalola, O. E.;Awoyera, P. O.;Ovallos-Gazabon, D.
研究采用三元胶凝材料体系和优化配合比的再生骨料混凝土的力学性能和耐久性。两个混凝土批次的开发使用致密配合比设计方法（DMDA），以评估所需的配合比。批次I具有在0.45的恒定w/B比下在0%、10%、20%、30%、40%和50%变化的GGBS含量，而批次II混凝土混合物具有变化的水/粘合剂比：0.3、0.35、0.4、0.45和0.5，恒定GGBS替换水平为30%。将两批细骨料（河砂）与粉煤灰以最佳松散堆积密度（FA+砂）混合，并将超塑化剂（SP）以1.4%的恒定水平掺入混合物中。还开发了由天然骨料组成的对照混合物。结果表明，利用矿渣和粉煤灰生产再生骨料结构混凝土是可行的。当矿渣掺量为30%，水胶比为0.35时，水泥的力学性能和耐久性能最佳。与NAC相比，RAC所采用的DMDA配合比显著改善了其性能，特别是在观察到的抗压强度为52 MPa的最佳RAC配合比下。此外，该混合物在氯离子进入和毛细管吸水方面表现出良好的抗渗透性。(C)2020作者（S）由爱思唯尔公司出版
This study aimed to investigate the mechanical and durability properties of recycled aggregate concrete with a ternary binder system and optimized mix proportion. Two concrete batches were developed using a densified mix design approach (DMDA) to evaluate the required mix proportions. Batch I have GGBS content varied at 0%, 10%, 20%, 30%, 40% and 50% at constant w/b ratio of 0.45, while batch II concrete mix have varied water/binder ratios: 0.3, 0.35, 0.4, 0.45 and 0.5 at constant GGBS replacement level of 30%. The fine aggregate (river sand) of the two batches was blended with fly ash at optimum loose packing density (FA+ Sand) and superplasticizer (SP) was incorporated in the mix at a constant level of 1.4%. A control mix comprising of natural aggregate was also developed. The results obtained showcased the feasibility of producing structural concrete with recycled aggregates using GGBS and fly ash. The mechanical and durability properties were best at 30% GGBS content and 0.35 water/binder ratio. The DMDA for mix proportion adopted for RAC contributed significantly to improving its properties when compared to NAC, especially at the optimum observed RAC mix with compressive strength of 52 MPa. Also, the mix demonstrated good permeability resistance in terms of chloride-ion ingress and capillary water absorption. (C) 2020 The Author(s). Published by Elsevier B.V.