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Influence of double hooked-end steel fibers and slag on mechanical and durability properties of high performance recycled aggregate concrete

机译：双钩端钢纤维和矿渣对高性能再生骨料混凝土力学和耐久性能的影响

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摘要

This paper presents a study on the properties of sustainable high performance steel fiber-reinforced concretes that were manufactured with recycled concrete aggregates (RCA). Natural coarse aggregates were replaced by RCA derived from parent concretes with compressive strengths of 40 and 80 MPa at volume replacement ratios of 50% and 100%. High performance concretes (HPC) were manufactured using double hooked-end steel fibers added at a fiber volume fraction of 1%, and in some of the mixes 30% of ordinary Portland cement was replaced by slag. Along with their mechanical properties, the water absorption, electrical resistivity, and shrinkage of the concrete mixes were evaluated. The results indicate that HPC with desirable properties can be produced using RCA derived from a high-strength parent concrete. The addition of steel fibers significantly increases the mechanical properties of recycled aggregate concretes. Replacing natural aggregates with RCA of lower strength adversely affects the durability properties of the concrete. However, concretes produced with a higher quality RCA and those containing slag and steel fibers exhibit reduced water absorption and shrinkage compared to plain natural aggregate concrete. The findings of this research are highly promising for the development of HPC with reduced environmental impact. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本文介绍了用再生混凝土骨料（RCA）生产的可持续高性能钢纤维增强混凝土的性能研究。用体积比为50％和100％的抗压强度分别为40和80 MPa的RCA代替天然粗骨料。高性能混凝土（HPC）使用的是双钩端钢纤维，其纤维体积分数为1％，并且在某些混合物中，普通硅酸盐水泥的30％被矿渣代替。连同其机械性能一起，评估了混凝土混合物的吸水率，电阻率和收缩率。结果表明，使用衍生自高强度母体混凝土的RCA可以生产具有理想性能的HPC。钢纤维的添加显着提高了再生骨料混凝土的机械性能。用较低强度的RCA代替天然骨料会对混凝土的耐久性产生不利影响。但是，与普通天然骨料混凝土相比，以更高质量的RCA生产的混凝土以及包含矿渣和钢纤维的混凝土表现出降低的吸水率和收缩率。这项研究的结果对于开发HPC并减少对环境的影响是很有前途的。 （C）2017 Elsevier Ltd.保留所有权利。

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