Abeysinghe Sonali, Gunasekara Chamila, Bandara Chaminda, Nguyen Kate, Dissanayake Ranjith, Mendis Priyan
School of Engineering, RMIT University, Melbourne, VIC 3000, Australia.
Faculty of Engineering, University of Peradeniya, Peradeniya 20400, Sri Lanka.
Polymers (Basel). 2021 Jun 6;13(11):1885. doi: 10.3390/polym13111885.
Incorporating recycled plastic waste in concrete manufacturing is one of the most ecologically and economically sustainable solutions for the rapid trends of annual plastic disposal and natural resource depletion worldwide. This paper comprehensively reviews the literature on engineering performance of recycled high-density polyethylene (HDPE) incorporated in concrete in the forms of aggregates or fiber or cementitious material. Optimum 28-days' compressive and flexural strength of HDPE fine aggregate concrete is observed at HDPE-10 and splitting tensile strength at HDPE-5 whereas for HDPE coarse aggregate concrete, within the range of 10% to 15% of HDPE incorporation and at HDPE-15, respectively. Similarly, 28-days' flexural and splitting tensile strength of HDPE fiber reinforced concrete is increased to an optimum of 4.9 MPa at HDPE-3 and 4.4 MPa at HDPE-3.5, respectively, and higher than the standard/plain concrete matrix (HDPE-0) in all HDPE inclusion levels. Hydrophobicity, smooth surface texture and non-reactivity of HDPE has resulted in weaker bonds between concrete matrix and HDPE and thereby reducing both mechanical and durability performances of HDPE concrete with the increase of HDPE. Overall, this is the first ever review to present and analyze the current state of the mechanical and durability performance of recycled HDPE as a sustainable construction material, hence, advancing the research into better performance and successful applications of HDPE concrete.
将回收塑料垃圾用于混凝土生产，是应对全球每年塑料处理量快速增长和自然资源枯竭趋势的最具生态和经济可持续性的解决方案之一。本文全面综述了有关以骨料、纤维或胶凝材料形式掺入混凝土中的再生高密度聚乙烯（HDPE）的工程性能的文献。HDPE细骨料混凝土在HDPE掺量为10%时观察到最佳28天抗压强度和抗弯强度，在HDPE掺量为5%时观察到劈裂抗拉强度；而对于HDPE粗骨料混凝土，分别在HDPE掺量为10%至15%的范围内以及HDPE掺量为15%时观察到最佳强度。同样，HDPE纤维增强混凝土的28天抗弯强度和劈裂抗拉强度分别在HDPE掺量为3%时提高到最佳值4.9MPa，在HDPE掺量为3.5%时提高到4.4MPa，并且在所有HDPE掺入水平下均高于标准/普通混凝土基体（HDPE-0）。HDPE的疏水性、光滑的表面质地和非反应性导致混凝土基体与HDPE之间的粘结较弱，从而随着HDPE含量的增加降低了HDPE混凝土的力学性能和耐久性。总体而言，这是首次对作为可持续建筑材料的再生HDPE的力学性能和耐久性的现状进行综述和分析，从而推动了对HDPE混凝土更好性能和成功应用的研究。
