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首页> 外文期刊>Construction and Building Materials >Properties enhancement of recycled coarse aggregates by pre-coating/pre-soaking with zeolite powder/calcium hydroxide
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Properties enhancement of recycled coarse aggregates by pre-coating/pre-soaking with zeolite powder/calcium hydroxide

机译：通过用沸石粉末/氢氧化钙预涂覆/预浸泡来改善再生粗骨料的性能

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The reuse of construction and demolition waste by recycling as aggregates can not only protect the environment, but also alleviate the shortage of natural resources. However, the application of recycled aggregates in practical engineering is limited due to their shortcomings, such as the higher crush value and water absorption, and the lower apparent density. In this study, four different treatments were designed to modify recycled coarse aggregates (RCAs) based on zeolite powder (ZP) and calcium hydroxide (CH), which were CH slurry pre-coating, CH solution pre-soaking, zeolite powder-cement (ZP-C) slurry pre-coating and ZP-C solution pre-soaking, respectively. Moreover, the macro-properties, micro-properties and nanomechanical properties of untreated and treated RCAs have been investigated, respectively. The results show that four treatments improve the properties of RCAs to some extent. Meanwhile, the width of cracks (W-c) of interfacial transition zone and cement matrix of treated RCAs also decreases according to the scanning electron microscope observation. Among the four treatments, the properties of RCAs pre-coated by ZP-C slurry present the most significant improvement, and the crush value and water absorption decrease by 30.4% and 19.8%, respectively, and the apparent density increases by 1.5%. In addition, there is the linear relationships between Wc and the crush value or the water absorption of RCAs. Furthermore, from the perspective of nanomechanical properties, the elastic modulus of cement matrix is the main factor affecting the marco-properties of RCAs. (C) 2021 Elsevier Ltd. All rights reserved.
机译：通过作为聚集体的回收来重用建筑和拆除浪费不仅可以保护环境，而且还可以减轻自然资源的短缺。然而，由于它们的缺点，例如较高的压碎值和吸水率，以及较低的表观密度，在实际工程中的应用在实际工程中的应用受到限制。在这项研究中，设计了四种不同的处理，以根据沸石粉末（ZP）和氢氧化钙（CH）来改变再循环粗聚集体（RCA），其是CH浆料预涂，CH溶液预浸泡，沸石粉末水泥（ ZP-C）浆料预涂层和ZP-C溶液分别预浸泡。此外，分别研究了未处理和处理的RCA的宏观性质，微观性和纳米力学性质。结果表明，4种治疗在一定程度上改善了RCA的性质。同时，根据扫描电子显微镜观察，界面过渡区和处理RCA的水泥基质的裂缝（W-C）的宽度也降低。在四种处理中，通过ZP-C浆料预涂覆的RCA的性质具有最显着的改进，并且分别将压碎值和吸水率降低30.4％和19.8％，表观密度增加1.5％。此外，WC与压碎值之间存在线性关系或RCA的吸水率。此外，从纳米力学性质的角度来看，水泥基质的弹性模量是影响RCAS Marco-uscies的主要因素。 （c）2021 elestvier有限公司保留所有权利。

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