Title: Sustainable green concrete: investigating the influence of recycled aggregates, polypropylene fibres, and nano clay additives on physical and mechanical properties

Authors: Pouria Baghaee Asadabadee; Babak Rouhi Broujeni; Amir Gholampour

Addresses: Department of Civil Engineering, Apadana Institute of Higher Education, Shiraz, Iran ' Department of Civil Engineering, Apadana Institute of Higher Education, Shiraz, Iran ' Department of Civil Engineering, Apadana Institute of Higher Education, Shiraz, Iran

Abstract: In this study, the eco-friendly concrete has been prepared by utilising construction and demolition (C&D) waste as aggregates. The effect of polypropylene fibre (PolyF) and nano clay (NC) were employed as additives. Subsequently, both were combined (PolyF-NC) to optimise the physical and mechanical properties of the green concrete (GC). Fourier transform infra-Red (FTIR), and scanning electron microscopy (SEM), were employed to analyse the morphology of the GC. At the optimised point, PolyF and NC revealed 76.7% and 82.5% increases in compressive strength, respectively. Additionally, PolyF improved the tensile strength 1.5 times compared to the reference sample. Lastly, the PolyF-NC increased the compressive and tensile strength by 12% and 2.1 times, respectively. Consequently, the mechanical properties enhanced by adding 1.8 kg/m³ NC and 9.45 kg/m³ PolyF to the GC. Based on results, using PolyF and NC additives enhances green concrete's physical properties with C&D waste aggregates.

Keywords: green concrete; recycled aggregates; additives; polypropylene fibres; nano clay.

DOI: 10.1504/IJETM.2024.139979

International Journal of Environmental Technology and Management, 2024 Vol.27 No.4/5/6, pp.265 - 278

Received: 22 Apr 2023
Accepted: 05 Sep 2023
Published online: 15 Jul 2024 *

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