Abstract
Lightweight concrete holds great promise for energy-efficient construction, particularly in the realm of wall materials. The primary objective of this research is to enhance both the mechanical and thermal performance of lightweight concrete, addressing the critical need for materials that not only provide structural integrity but also contribute to energy savings. Recognizing the potential of Expanded Polystyrene (EPS) beads, a surface modification strategy involving a fly ash-based coating is employed to improve interfacial bonding, mechanical strength, and thermal insulation properties.This research was implementing a comprehensive methodology to achieve the research objective. The application of a coating that is based on fly ash to EPS beads was carried out with careful consideration, and the materials that are produced as a result are put through careful evaluation. The most important findings suggest that, in terms of mechanical strength, concrete made from coated EPS performs noticeably better than concrete made from plain EPS. However, a different pattern appears to be seen in the thermal conductivity of the material. On the other hand, when compared to conventional concrete, the insulation capabilities of coated and non-coated EPS in concrete are considerably better than those of conventional concrete. This highlights the potential of modified EPS as a material for the construction of energy-efficient walls with a high level of efficiency.
Significant implications are derived from these findings. Concrete composed of Coated EPS presents itself as a feasible substitute for conventional wall masonry materials, owing to its enhanced insulating properties while maintaining structural integrity. This has considerable implications for energy-efficient building practices, which require materials that effectively combine strength and insulation.
In terms of mechanical properties, the compressive strength of MEPS concrete decreased compared to the compressive strength of normal concrete by 66-70% at the age of 28 days. However, concrete made of EPS beads coated with fly ash powder showed an increase in strength of 24-33% against concrete made of EPS beads without a coating process. This result indicates that the coating treatment on EPS beads can positively increase compressive strength. This MEPS concrete's compressive strength is sufficient to meet the NHBC standard for house building use as a wall material. Meanwhile, in terms of thermal properties, the thermal conductivity value of concrete using EPS beads shows superior potential compared to normal concrete. This fact is evidenced by the difference in thermal conductivity value of 60-70% better than normal concrete's thermal conductivity (1.213 W/mK for normal concrete compared to 0.377-0.489 W/mK for EPS and MEPS concrete). The lower thermal conductivity indicates that the material's insulating ability is improving. According Therefore, according to the research findings, the integration of coated EPS into wall constructions may result in substantial energy conservation without compromising the building's integrity.
In summary, this research contributes valuable insights into the application of coated EPS in lightweight concrete for energy-efficient wall constructions. Further studies could delve deeper into optimizing the coating process and exploring additional materials for modification. Understanding the interplay between mechanical strength and thermal performance remains an essential avenue for future research. Additionally, investigating the long-term durability and environmental impact of coated EPS in real-world construction scenarios would further advance the practical applications of this innovative material.
| Date of Award | 14 Aug 2024 |
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| Original language | English |
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| Supervisor | Morteza Khorami (Supervisor), Messaoud Saidani (Supervisor) & Mingwen Bai (Supervisor) |