Engineering properties and sustainability assessment of recycled fibre reinforced rubberised cementitious composite
Engineering properties and sustainability assessment of recycled fibre reinforced rubberised cementitious composite
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DOI：
10.1016/j.jclepro.2020.123996
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发表时间：
2021-01-01
影响因子：
11.1
通讯作者：
Zhang, Mingzhong
中科院分区：
文献类型：
--
作者：
Chen, Meng;Zhong, Hui;Zhang, Mingzhong
为了提供一种环保的方式来处理日益积累的废弃轮胎，并减少生产工业纤维对环境造成的影响，本研究探讨了在水泥砂浆中使用再生轮胎材料替代天然细骨料和人造纤维的可行性。试验研究了废橡胶粉（CR）取代率（5%~ 15%）、再生轮胎钢（RTS）纤维掺量（0.5%~ 1.5%）和再生轮胎聚合物（RTP）纤维掺量（0.5%~ 1.0%）对纤维增强水泥基复合材料（FRRC）工程性能的影响。结果表明，采用NaOH溶液对CR进行预处理后，在不显著降低纤维增强混凝土工作性、体积密度、超声脉冲速度和抗压强度的前提下，联合收割机与高掺量再生纤维复合是可行的。与普通砂浆相比，CR、RTS纤维和RTP纤维共同掺入可使砂浆的干燥收缩率降低41.6%，抗折强度提高174%。用再生轮胎纤维替代人造纤维，纤维增强混凝土的生产成本、隐含碳和隐含能可降低13.3%~ 68.2%。综合考虑工程性能、成本和环境影响，CR、RTS纤维和RTP纤维的最佳掺量分别为5%~ 10%，1.0vol%和0.5vol%。(C)2020爱思唯尔有限公司保留所有权利。
To provide an eco-friendly disposal way of increasingly accumulated waste tyres and reduce the environmental impact caused by the production of industrial fibres, this study explores the feasibility of using recycled tyre materials as substitutes for natural fine aggregates and manufactured fibres in cementitious mortar. The effects of crumb rubber (CR) replacement ratio (5%-15% by volume of fine aggregates), recycled tyre steel (RTS) fibre content (0.5-1.5 vol%) and recycled tyre polymer (RTP) fibre content (0.5-1.0 vol%) on the engineering properties of fibre reinforced cementitious composite (FRRC) were experimentally investigated. Results indicate that the pre-treated CR using NaOH solution is feasible to combine with a high dosage of recycled fibres without considerably weakening the workability, bulk density, ultrasonic pulse velocity and compressive strength of FRRC. The incorporation of CR, RTS fibre and RTP fibre together can reduce the drying shrinkage by up to 41.6% and enhance the flexural strength by at most 174% as compared to the plain mortar. The production cost, embodied carbon and embodied energy of FRRC are decreased by 13.3%-68.2% when replacing the manufactured fibres with recycled tyre fibres. The optimal content of CR and RTS fibre and RTP fibre is 5%-10%, 1.0 vol% and 0.5 vol%, respectively, considering the engineering properties, cost and environmental impact. (C) 2020 Elsevier Ltd. All rights reserved.