Upcycling waste plastics to fabricate lightweight, waterproof, and carbonation resistant cementitious materials with polymer-nano silica hybrids
Upcycling waste plastics to fabricate lightweight, waterproof, and carbonation resistant cementitious materials with polymer-nano silica hybrids
复制标题
利用聚合物-纳米二氧化硅混合物升级回收废塑料以制造轻质、防水和抗碳化的水泥材料
DOI：
10.1016/j.mtsust.2023.100325
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发表时间：
2023-02-03
影响因子：
7.8
通讯作者：
Zeng, Q.
中科院分区：
文献类型：
--
作者：
Al-Mansour, A.;Dai, Y.;Zeng, Q.
大多数在环境中迅速大量堆积的塑料废弃物没有得到回收利用，而是最终进入垃圾填埋场和海洋，造成水、土壤和空气的污染。这项工作提出了一种在水泥基材料中使用乙烯 - 醋酸乙烯酯（EVA）和纳米二氧化硅（nS）混合物将废弃塑料作为骨料进行强化回收的方案。用回收废弃塑料（RWP）替代10%和15%的天然砂，并对RWP水泥基材料的密度、力学性能、毛细吸水性和抗碳化性进行了评估。结果表明，制成的RWP试件不仅比参照混合物轻15% - 18%，而且EVA - nS的混合作用在减轻力学强度降低和将延展性提高至107%方面是有效的。由于EVA形成的聚合物薄膜，防水性能有了约50%的显著改善，而由于nS的填充和火山灰效应，抗碳化性提高了70%以上。用RWP替代10%的天然砂有可能使每年的砂消耗量减少0.56 - 10亿吨，这将使全球每年的二氧化碳排放量大幅减少280 - 1390万吨。这些发现为在可持续、耐用和轻质建筑材料行业中对RWP进行升级回收开辟了一条绿色途径。（c）2023爱思唯尔有限公司。保留所有权利。
Most of the plastic waste, that rapidly and massively accumulates in the environment, does not get recycled but ends up in landfills and oceans causing pollution of water, soil, and air. This work presents an enhanced recycling scheme of waste plastics as aggregates in cementitious materials with ethylenevinyl acetate (EVA) and nanosilica (nS) hybrids. 10% and 15% of natural sand were replaced by recycled waste plastic (RWP), and density, mechanical properties, capillary sorptivity and carbonation resistance of the RWP cementitious materials were evaluated. Results showed that not only the fabricated RWP specimens were 15%-18% lighter than the reference mixture but also the hybrid effect of EVA-nS was efficient in mitigating mechanical strength reductions and improving ductility up to 107%. Significant ameliorations of around 50% were observed in waterproof performance owing to the polymeric films created by EVA, while over 70% increase in carbonation resistance was noted owing to the filling and pozzolanic effects of nS. The replacement of natural sand with RWP by 10% would have the potential of reducing the annual sand consumption by 0.56-1 billion tons, which would substantially decrease the global CO2 emissions by 2.8-13.9 million tons annually. These findings pave a green path for upcycling RWPs in the sustainable, durable and lightweight construction material industry. (c) 2023 Elsevier Ltd. All rights reserved.