Performance of Sustainable Concrete Bricks Containing Construction and Demolition Waste as Recycled Fine Aggregate
摘要
Environmental pollution due to construction is one of the problems faced in infrastructure development since it has a negative impact on ecosystems and urban areas. This research aims to investigate experimentally the effects of using construction and demolition waste as a replacement of natural fine aggregate in producing concrete bricks for sustainable infrastructure. Construction waste sourced from concrete after demolition of old buildings was used in this experiment. The waste was refined using a Reduce, Reuse, Recycle (3R) solid construction waste processing machine before using as a fine aggregate replacement at a percentage of 20%, 30% and 40% by wt. of sand to produce fully solid concrete bricks. The compressive strength, water absorption, fire and sound resistance tests were conducted to evaluate the mechanical and durability performance of concrete bricks. The results show that the highest resistance on compression load was achieved by mixture containing 40% of recycled fine aggregate while using a higher percentage led to reduce the compressive strength value. However, an issue was found on water absorption results. On the other hand, the use of recycled fine aggregate results in increasing the resistance of concrete bricks on fire and sound insulation. This indicates the potential implementation of construction and demolition to replace fine aggregate in making concrete products to support green and sustainable construction.