No abstract

No abstract

Abstract. The force transferring between reinforcing steel and the surrounding concrete in reinforced concrete is influenced by several factors. Whereas, the study on bond behaviour of geopolymer concrete (GPC) is lagging. In this paper, an experimental attempt has been made to evaluate the geopolymer concrete bond with reinforcing steel of different diameter and embedded length using standard pull out test. The geopolymer concrete is made of ground granulated blast furnace slag (GGBFS) as geopolymer source material (GSM). The tests were conducted to evaluate the development of bond between steel and concrete of grade M40 and M50 with 12 and 16 mm diameter reinforcing steel for geopolymer and cement concrete mixes and to develop a relation between bond strength and compressive strength. From the experimental results, it has been observed that the bond strength of the geopolymer concrete mixes was more compared to the cement concrete mixes and increases with the reduction in the diameter of the bar.

This paper presents a comprehensive experimental investigation to explore the effect of synthetic and natural fibers, both individual and hybrid, on the strength properties and impact resistance of concrete exposed to different elevated temperatures (27, 200, 400, and 800 C). The influence of steel, polypropylene, and sisal fibers on compressive strength and impact resistance under the elevated temperature was investigated, and a comparison was made with conventional concrete. Apart from mono-fiber reinforced concrete, the resistance of hybrid fiber reinforced concrete containing steel-polypropylene and sisal fibers in different hybrid combinations to impact loading and compressive strength was also evaluated. The results revealed that the incorporation of fibers helps in improving the mechanical properties of concrete both at ambient and elevated temperatures. Finally, this study confirms that mono steel fibers can be replaced with a hybrid mix containing natural fiber to improve concrete's residual hardened properties and fire resistance.

25