Abstract
Cement, which is a significant component of concrete, is used in construction. Unfortunately, during the manufacture of cement, considerable amounts of CO2 are released into the atmosphere. CO2 is the primary greenhouse gas responsible for global warming; finding alternatives to cement is essential to reduce CO2 emissions. Primarily due to its high carbon dioxide emissions, the environmental impact of OPC has prompted the search for sustainable alternative binders. Geopolymer concrete, an eco-friendly substitute, has gained attention for its potential to significantly reduce the carbon footprint associated with construction materials. Constructing large-scale structures with mass concrete leads to the formation of interfaces and joints, thereby creating potentially weak points prone to cracking. These connections may link concrete of various strengths or interface with diverse construction materials, such as steel. Ensuring a cohesive performance in composite concrete structures requires robust bonding at these interfaces, which is typically achieved using shear ties. However, an excess of these ties can hinder construction efficiency. To tackle these challenges concerning the effectiveness and structural stability of the construction, this study aims to assess the effects of polypropylene, steel, and glass fibers on the interfacial shear strength of geopolymer concrete by understanding how these different fibers influence the mechanical properties of geopolymer concrete. It was observed that with the addition of the fibers, strength was increased up to the threshold limit; after that, it was reduced. The results of the investigation showed that the shear strength increment of steel fiber-reinforced GPC is a maximum of 72%; for glass fiber, it was 19%.