The influence of roof tile waste as fine aggregates on the properties and microstructure of green concrete

Mohd Khaidir, Nur Athirah (2024) The influence of roof tile waste as fine aggregates on the properties and microstructure of green concrete. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Roof tile waste (RTW) constitutes a huge part of construction waste generated at sites and is mostly disposed of in landfills. This study analyses the characteristics of different kinds of RTW as fine aggregates in green concrete, the effect of different types of roof tile wastes on physical and mechanical properties, and the influences on the microstructure of green concrete. This study assesses some of the physical properties of green concrete containing 50 wt% unglazed (URTW) and 20 wt% glazed (GRTW) fine aggregates with the following techniques: particle size analyses (PSA), scanning electron microscopy (SEM), Brunauer Emmett-Teller analyses (BET), X-ray fluorescence analyses (XRF), and X-ray diffraction (XRD). Green concrete GRTW accounts for the highest compressive strength at 31.2 N/mm², with the lowest water absorption rate of 4.15% and a density of 2231 kg/m³. Green concrete URTW had a density of 2295 kg/m³, an absorption rate of 5.7% by water, and a compressive strength of 26.9 N/mm². In contrast, the control concrete had the lowest density, at 2164 kg/m³, with the largest rate of water absorption at 6.43% and the lowest compressive strength at 24.1 N/mm². The results indicate that the addition of RTW aggregates, particularly GRTW, to green concrete gives it high mechanical strength, lower water absorption, and a refined microstructure in comparison with traditional sand.

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