A comprehensive review on multilayered natural-fibre composite reinforcement in geopolymer concrete

Amid growing environmental concerns in India regarding the substantial CO₂ emissions from Portland cement, accounting for 5 to 8 % of total emissions, the development of Geopolymer concrete (GPC) emerged as a long-term substitute. The study aims to review the research works on geopolymer concrete fortified with diverse elements like GGBFS, nanomaterials, and natural Fibres. The research employs a multidisciplinary methodology, encompassing a comprehensive assessment of previous experimental studies conducted by the investigators to examine the mechanical and structural characteristics, as well as the durability and microstructural aspects, of composite materials used in the production of geopolymer concrete. Materials under investigation include Fly ash, GGBFS, Nanoclay, bamboo, sisal, and hemp fibres. Findings from the literature review reveal that compared to a control mix, the notable improvements in compressive, tensile, and flexural strength by integrating GGBFS and Nanoclay are 15 %, 27 %, and 106 %, respectively. Adding hemp fibres at 5 % volume fraction, Fly ash, and GGBFS amplifies the water absorption capacity by 20 %. Sisal fibre was utilized as reinforcement in glass composites to develop a multilayered sisal-glass composite in polyester matrix optimal configuration (4 glass and 9 sisal layers) demonstrated excellent mechanical properties, including a tensile strength of 57.60 MPa, flexural strength of 36 N/mm², and 10 % moisture absorption, offering superior performance and cost-effectiveness. The findings highlight the effectiveness of strategic fibre layering in enhancing composite strength and cost efficiency. Natural fibres like hemp, bamboo, and sisal also improve the composites hardness and tensile characteristics. These consequences highlight the possibility of incorporating supplementary materials in geopolymer concrete, offering substantial improvements in mechanical and durability, environmental sustainability, and cost-effective construction solutions.