Effect of Basalt Macro Fibres on the Impact Behaviour of Geopolymer Concrete Beams with Composite Bars
摘要
Climate change has led to a growing interest in developing sustainable and durable structures. In recent years, new materials such as Basalt Macro Fibres (BMFs) and Steel-BFRP Composite Bars (SBCBs) have been proposed and used in concrete structures because they have the merit of high corrosion resistance. Concrete structures might be exposed to extreme events such as falling rock impacts or vehicle collisions. It is significant to understand the impact-resistant behaviour of concrete structures made of new materials such as BMFs and SBCBs. Currently, only very limited studies in the open literature have been found to investigate the impact-resistant performance of BMF-reinforced geopolymer concrete beams with SBCBs. In this study, three SFCB-reinforced geopolymer concrete beams were constructed and impact tests were carried out through a pendulum impact testing apparatus. Various BMF contents (0%, 1%, and 2%) were considered in the three beams, and the effect of BMF content on the response of geopolymer concrete beams subjected to impact loading was examined. It was found that increasing the BMF content up to 2% could greatly alleviate cracking damage, leading to a reduction of up to 50% in the beam deflections.