Assessing compressive strength and dimensional stability of detachable green concrete tiles for flooring applications

Saharudin, Muhammad Muzakkir Asyraf (2024) Assessing compressive strength and dimensional stability of detachable green concrete tiles for flooring applications. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text (Full text) Assessing compressive strength and dimensional stability of detachable green concrete tiles for flooring applications.pdf - Submitted Version Download (4MB)

Abstract

Natural aggregate depletion has become a global issue despite increasing structural construction demands. Concurrently, the accumulation of plastic waste has emerged as a significant environmental problem. Converting waste plastics into construction aggregates offers a promising solution to both issues. The construction industry is increasingly adopting eco-friendly materials, such as concrete tiles made from hybrid natural and plastic aggregates. However, the differing chemical structures of plastics and other concrete components may cause structural changes under heat and stress, affecting the strength and dimensional accuracy of the tiles. This study aimed to understand the effect of recycled high-density polyethylene (rHDPE) as fine aggregates at natural-to-plastic aggregate ratios of 100:0, 97:3, 93:7, and 90:10 for M20 concrete mixture. Compressive strength was evaluated using a UTM machine per BS EN 12390:3:2000, while dimensional accuracy was measured within ±3mm tolerance with callipers (ASTM C157) and surface roughness with a profilometer (ASTM E867). Results showed that compressive strength decreased with increasing rHDPE content, with the 0% rHDPE mix exhibiting the highest strength of 21.73 MPa at 28 days. Yet, all tiles met the minimum requirement of 10 MPa for flooring applications. Dimensional changes increased with higher rHDPE content, reaching up to 2.4% for the 10% mix. Surface roughness (Ra) values fell within the optimal range of 6-9 µm for all mixes, ensuring adequate slip resistance and aesthetics. Morphological analysis revealed a dense and uniform microstructure for the natural aggregate sample, while rHDPE mixes showed increasing porosity and micro-cracks with higher plastic content. SEM images confirmed a weaker interfacial transition zone between rHDPE and the cement matrix, reducing compressive strength. In conclusion, green concrete tiles with a 93:7 natural-to-plastic aggregate ratio exhibited a balance between incorporating recycled plastic and maintaining structural integrity, making them suitable for eco-friendly flooring applications. The 90:10 ratio mix, while meeting the minimum strength requirement, showed greater dimensional changes and reduced compressive strength, but its lower density makes it ideal for applications prioritizing lightweight and sustainability.

Actions (login required)

View Item