Improvement of mechanical strength of recycled blend concrete with secondary vibrating approach
Improvement of mechanical strength of recycled blend concrete with secondary vibrating approach
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DOI：
10.1016/j.conbuildmat.2019.117661
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发表时间：
2020-03
影响因子：
7.4
通讯作者：
R. Rao;Qidong Deng;Jiyang Fu;Chunhui Liu;Xiaowei Ouyang;Yonghui Huang
中科院分区：
文献类型：
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作者：
R. Rao;Qidong Deng;Jiyang Fu;Chunhui Liu;Xiaowei Ouyang;Yonghui Huang
为了实现建筑的可持续性，在再生混凝土（RBC）中使用拆除混凝土作为新拌混凝土（FC）的替代物已经得到了极大的关注。RBC是由FC和粗碎拆除混凝土块（DCB）制成的混凝土混合物，这些混凝土块明显大于传统骨料。这是一种简单而经济的方法来回收拆除的混凝土，并已在许多项目中实施。然而，RBC的一些机械强度包括圆柱形抗压强度、抗拉强度和抗弯强度较差，限制了其被建筑行业接受。本文提出了一种补救振动的方法，即“二次振动法（SVA）”，旨在提高红细胞的机械强度。实验结果表明，使用SVA可以显着提高红细胞的机械强度。应用SVA有助于填充一些空隙和裂缝，并改善水化，导致更致密和更坚固的界面，从而提高RBC的机械强度。
To achieve construction sustainability, the use of demolished concrete as substitution of fresh concrete (FC) in recycled blend concrete (RBC) has gained significant attention. RBC is a concrete mix made of FC and coarsely-crushed demolished concrete blocks (DCBs) which are distinctly larger than the conventional aggregates. It is a simple and economical approach to recycling demolished concrete and has been implemented in many projects. However, some mechanical strength of RBC including the cylindrical compressive strength, tensile strength and flexural strength are inferior, limiting its acceptance by the construction industry. This paper proposes a remedial vibrating approach, namely “secondary vibrating approach (SVA)”, intending to improve the mechanical strength of the RBC. Experimental results show that using SVA can significantly increase the mechanical strength of the RBC. Applying SVA helps to fill some of the voids and cracks and to meliorate the hydration, resulting in denser and stronger interfaces, and subsequently improves the mechanical strength of RBC.