Application of Granitic Residual Soil and Palm Oil Fuel Ash as an Absorbing Material to Develop High-Strength Anti-microwave Brick Walls

Electromagnetic pollution from modern technologies has resulted in electromagnetic radiation. Wireless communication, power transmission, and communications gadgets utilized in our daily lives, such as mobile phones, tablets, and laptop computers, expose people to electromagnetic pollution. The pervasiveness of these technologies has raised concerns regarding the safety of human radio frequency radiation exposure. The effectiveness of radiation-absorbing materials (RAM) in absorbing microwave energy has led to an increase in attention in recent years. Substantial research has been conducted to produce new radiation-absorbing materials with great absorbing performance. In this research, anti-microwave brick walls were developed. As we know, brick is a fundamental building unit and the most often used construction material. However, the existing brick is incapable of absorbing microwave energy. This study aims to examine the absorption performance of solid anti-microwave brick walls with various raw material composition ratios incorporating granitic residual soil and Palm Oil Fuel Ash (POFA) as absorbing materials. Agricultural waste is high in lignin content, with about half of the components containing carbon which is a good electromagnetic wave absorbent. The absorption performance of the anti-microwave bricks was tested using the Naval Research Laboratory (NRL) Arch free-space method, and the findings were studied over a frequency range of 1–12 GHz. According to the results of the investigation, solid anti-microwave bricks containing 15% landslide and 35% POFA achieved the best absorption performance, with a maximum absorption of −39.19 dB with great compressive strength, 13.615 MPa.