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Utilization and assessment of recycled polyethylene terephthalate strapping bands as lightweight aggregates in Eco-efficient composite mortars

2020; Elsevier BV; Volume: 270; Linguagem: Inglês

10.1016/j.conbuildmat.2020.121427

1879-0526

Mostefa Hacini, Ahmed Soufiane Benosman, Nabil Kazi Tani, M. Mouli, Y. Senhadji, Abdelhak Badache, Noureddine Latroch,

Recycled Aggregate Concrete Performance

In this work, we explored the possibility of using aggregates of shredded polyethylene terephthalate strapping bands (SPETSB) in mortar. A survey was carried out to assess the feasibility of recycling this plastic waste to be used in the manufacture of environmentally-friendly lightweight mortars through partial replacement of silica-calcareous sand with lighter SPETSB aggregates, by volume at 0, 15, 30, 45 and 60 %. A scanning electron microscopy analysis along with a study of the alkali – silica reaction was conducted; the density, mechanical and thermal properties were assessed for evaluating the properties of lightweight mortar containing SPETSB aggregates (LWMSB). Laboratory tests revealed encouraging results and confirmed the feasibility of manufacturing lightweight aggregate mortar with a density between 1620 and 1944 Kg/m3, a compressive strength equal to 28.8 MPa and thermal conductivity of 0.75 W/m.K, at 28 days, for 60% of SPETSB. The flexural strength, ultrasonic pulse velocity (UPV) and dynamic elastic modulus (Ed) were lower by 46%, 25% and 56%, respectively, compared to the values of normal weight mortar (NWM). This study also allowed deducing that the expansion due to the alkali–silica reaction decreases for all LWMSB types, when the substitution rate of SPETSB increases; this makes it possible to obtain a non-reactive mortar. Therefore, these findings suggest that using LWMSB composite mortars in building applications is possible.