Feasibility of incorporating recycled fine aggregate in high performance green lightweight engineered cementitious composites
Feasibility of incorporating recycled fine aggregate in high performance green lightweight engineered cementitious composites
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DOI：
10.1016/j.jclepro.2020.124445
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发表时间：
2021
影响因子：
11.1
通讯作者：
Yingwu Zhou;Guoqiang Gong;Yuanjun Huang;C. Chen;Dongsheng Huang;Zi-Hao Chen;Menghuan Guo
中科院分区：
文献类型：
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作者：
Yingwu Zhou;Guoqiang Gong;Yuanjun Huang;C. Chen;Dongsheng Huang;Zi-Hao Chen;Menghuan Guo
高质量的再生混凝土骨料的再利用，特别是再生细骨料（RFA），表现出固有的缺陷，是非常重要的，以减轻与骨料耗尽和废弃混凝土处置的环境问题。本研究利用射频消融技术和工业废弃物，通过合理的组分定制，成功开发了高性能绿色轻质工程水泥基复合材料（HPGLW-ECC）。该设计的环保材料具有1733 kg/m3的密度、高达6.42 MPa的拉伸强度和7.46%的拉伸应变能力，具有令人印象深刻的机械性能。值得注意的是，0-1 mm RFA的掺入有助于HPGLW-ECC的连续分级，并使颗粒之间的间隙最小化，这提高了材料的整体致密性。RFA的高粗糙度有利于纤维与基体之间的互锁效应，有助于纤维桥接能力的发展。此外，RFA的自胶结作用进一步致密了HPGLW-ECC的微观结构。0-1 mm射频消融对HPGLW-ECC力学性能的增强作用主要表现在对材料微观孔隙结构的细化以及纤维和基体的破坏形态特征。
The high-quality reutilization of recycled concrete aggregate, particularly the valorization of recycled fine aggregate (RFA) that exhibits inherent defects, is of great importance to mitigate environmental concerns associated with aggregate depletion and waste concrete disposition. In this study, RFA and industrial wastes were successfully used to develop high performance green lightweight engineered cementitious composites (HPGLW-ECC) through proper tailoring of the components. The designed eco-friendly material exhibiting a density of 1733 kg/m3, tensile strength up to 6.42 MPa and tensile strain capacity to 7.46% features impressive mechanical properties. It is remarked that the incorporation of 0–1 mm RFA contributes to the continuous grading of HPGLW-ECC and minimizes the gaps between the particles, which improves the overall compactness of the material. The high roughness of RFA favors the interlocking effect between fiber and matrix and contributes to the development of fiber bridging capacity. Moreover, the self-cementing of RFA further densifies the microstructure of HPGLW-ECC. The enhancement effects of 0–1 mm RFA on the mechanical performance of HPGLW-ECC were characterized by the refinement of microstructural pores as well as by the failure morphology features of fiber and matrix.