Modeling of Thermal Performance and Mechanical Properties of Concrete Blocks Incorporating Plastic Bottle Waste with Crushed Clay Bricks as Coarse Aggregates

• Published in: Cogent engineering Vol. 10; no. 2
• Main Authors: Kougnigan, Abla Marie-Josée Nadège, Mwero, John, Mutuku, Raphael
• Format: Journal Article
• Language: English
• Published: Abingdon Cogent 29.12.2023; Taylor & Francis Ltd; Taylor & Francis Group
• Subjects: Bottles; Bricks; Clay; clay bricks; Compressive strength; Concrete aggregates; Concrete blocks; Concrete properties; Crushing; Density; Energy consumption; Finite element method; Heat conductivity; Heat transfer; lightweight concrete blocks; Lightweight concretes; Load bearing elements; Masonry; Mechanical properties; plastic bottles; Thermal conductivity; Water absorption
• ISSN: 2331-1916; 2331-1916
• DOI: 10.1080/23311916.2023.2283334

This research aims to examine the mechanical characteristics and thermal performance of concrete masonry blocks made from clay waste bricks that have been crushed, used as coarse aggregates, and incorporated plastic bottles. A simulation of the heat transfer of blocks was also made using Finite Element Method. The study uses plastic bottles of 350 ml of volume and clay brick waste as a complete replacement for traditional aggregates to produce lightweight concrete. The blocks utilized in the study were 150 mm × 200 mm×400 mm in size. The blocks underwent testing for various properties such as water absorption, ultrasonic pulse velocity, density, compressive strength, and thermal conductivity to ASTM C140 standards. The incorporation of plastic bottles created 23% voids in the blocks for the density test, and the results revealed that the block's performance met the ASTM C129 standards for load-supporting blocks with regard to its capacity to absorb water (134.9 kg/m 3 ), lightness, and strength (12MPa). Additionally, the study revealed a decrease in thermal conductivity by more than 50% compared to conventional concrete blocks without bottles; a result which was confirmed by the blocks' heat transfer simulation. In conclusion, based on the fact that the blocks studied met the mechanical standards for load-bearing masonry units, it is proposed that the construction sector consider incorporating these types of blocks in areas where heat insulation is necessary to reduce building energy consumption related to cooling.