To Study the Mechanical Behaviour of M30 Grade Concrete Using Light Weight and Self-Healing Concrete with Partial Replacement of Flyash and Coconut Fiber

Concrete is a widely used construction material due its high strength, durability. Traditional concrete has several limitations, including high weight, low thermal insulation and susceptibility to cracking and damaging. This study investigates various modifications to conventional concrete to enhance its mechanical properties, durability, and sustainability. The research focuses on four distinct approaches: incorporating 1.5% coconut coir fiber by volume to analyse its impact on compressive, tensile, and flexural strength; replacing 25% of cement with fly ash in M30 grade concrete to improve durability and sustainability while reducing cement consumption; utilizing lightweight expanded clay balls as a substitute for traditional coarse aggregates to achieve lower density without compromising strength; and exploring self-healing concrete using Bacillus subtilis, which promotes microbial-induced calcium carbonate precipitation (MICP) to heal cracks and extend service life. These investigations contribute to the development of sustainable and high-performance concrete materials for diverse structural applications. The findings of this study suggest that the use of fly ash, coconut fiber, lightweight aggregate and self-healing bacteria can improve the strength, durability and sustainability of M30 grade concrete.