Abstract
The need to promote sustainable civil infrastructure is one of the most important concerns in the construction industry. Geopolymer composites are one of the promising eco-friendly materials for the development of low carbon concrete. The main objective of this experimental investigation is to study the effect of hybrid fibres on the shear strength of flexural members made with ternary blend geopolymer concrete (TGPC). A total number of 27 reinforced concrete beams of size 100 mm × 150 mm × 1200 mm were cast and tested for shear. M55 grade of concrete was considered in this study. Crimped steel fibres and polypropylene fibres with an aspect ratio of 66 and 300, respectively, were used in this work. The main variables considered in this investigation involve two volume proportions of steel fibres, viz., 0.5% and 1% as well as four volume proportions of polypropylene fibres viz., 0.1%, 0.15%, 0.2% and 0.25%. The hybrid fibre-reinforced ternary blend geopolymer concrete (HTGPC) beams were compared with TGPC beams without fibres. From the test results, it was clear that incorporating hybrid fibres improved the shear strength and changed the type of failure of the beam from shear to flexure. Moreover, a method to predict the ultimate shear strength of HTGPC was proposed, and the estimated values were found to be the same as the test results.
Highlights
Geopolymer concrete (GPC) is a new environmentally friendly material that reduces the global warming of the Earth and the greenhouse effect by replacing ordinary Portland cement (OPC)
Ternary blend geopolymer concrete (TGPC) is developed by mixing three different source materials of varying particle sizes to form a denser concrete, resulting in improved properties compared to GPC [7,8]
Et al [36] and Ganesan et al [37] reported the response of geopolymer concrete beams tested under shear and the effect of steel fibres on the shear strength of beams
Summary
Geopolymer concrete (GPC) is a new environmentally friendly material that reduces the global warming of the Earth and the greenhouse effect by replacing ordinary Portland cement (OPC). Navid et al [26] studied the fibre–matrix interaction of fly ash-based GPC incorporated with steel and polypropylene fibres They reported that the fibres played a vital role in the interfacial bond and improved properties such as energy absorption and flexural strength. Et al [36] and Ganesan et al [37] reported the response of geopolymer concrete beams tested under shear and the effect of steel fibres on the shear strength of beams All these works are limited to normal concrete, HPC, UHPFRC and fly ash-based GPC composites. Th3eoaf v14erage particle size of metakaolin is 2–3 microns These three materials were combined to form a ternary binder for the TGPC.
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