A Review of the Influence of Fibres on the Fracture Properties of Sustainable Geopolymer Concrete
摘要
Geopolymer concrete (GPC) has emerged as a promising sustainable alternative to traditional portland cement concrete due to its lower carbon footprint, reduced environmental impact, superior mechanical properties, and potential to utilize various waste materials as precursors. However, GPC exhibits higher brittleness and a lower elastic modulus when compared to conventional cement concrete. The brittleness of GPC makes it susceptible to cracking under different loading scenarios, such as fatigue, overloading, or environmental factors, but incorporating fibres can prevent crack formation. The aim of this paper is to provide a comprehensive review of the influence of fibres on the fracture properties of sustainable GPC. The use of various types of fibres, including steel fibre (SF), polypropylene fibre (PPF), polyvinyl alcohol fibre (PVA), basalt fibre (BF), glass fibre (GF), and hybrid fibres, in GPC are discussed in this study. Additionally, this study also provides an overview of the various fracture parameters utilized in GPC studies. The fracture behaviours of the fibre-reinforced GPCs, such as fracture energy, crack mouth opening displacement, fracture toughness, critical stress intensity factor, etc., were investigated based on past research work with various precursors and fibre reinforcements. These fracture parameters can be used to characterize the mechanical behaviour of GPC and to optimize its performance for different applications. Overall, this review provides valuable insights into the current state of knowledge on the influence of fibres on the fracture properties of GPC and serves as a valuable reference for researchers and practitioners in sustainable construction materials.