Subject Area

Architectural Engineering

Article Type

Case Study


This study examines the importance of using recycled waste in building materials in order to reduce energy consumption and improve the environmental impact of housing projects. The study focuses on the possibility of using recycled waste in building bricks for external walls as one of the building envelope elements in average housing projects in Egypt. Waste such as limestone, polystyrene and rice ashes were used in compressed cement bricks for the external walls to study the effect on thermal conductivity, thermal comfort and energy consumption using a simulation program (Design Builder). The laboratory results found that the use of recycled waste such as limestone, polystyrene, straw Rice with 10% as a substitute for cement content in cement bricks for external walls contributes to improving the thermal conductivity of cement bricks to be 0.78 W/m² (limestone), 0.71 W/m² (polystyrene), 0.68 W/m² (rice straw) compared to 0.88 W/m Kelvin for cement bricks. The results of the simulation of a small model of a residential room revealed that the addition of waste used in the study by 10% to cement bricks contributes to improving the thermal performance, which is reflected in the energy consumption in small proportions, but the importance of the study lies in enhancing the participation of recycled waste in building bricks for housing projects in Egypt.


Recycle material, Average housing, Thermal comfort; Thermal conductivity

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.