Bond characteristics of reinforcing steel embedded in geopolymer concrete

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.

Bond Stress Behavior of a Steel Reinforcing Bar Embedded in Geopolymer Concrete Incorporating Natural and Recycled Aggregates

“…It was noted that bond stress reduced by about 5.5% with increasing embedment length for all CRAC mixes, as applied load was distributed over a larger surface area with an increasing embedment length. In the existing literature, Kathrival et al [44] and Kim and Park [45] also reported a reduction in bond stress with increasing embedment length for varying percentages of replacement.…”

“…Similarly, the bond stress was decreased by 7.84%, 10.82%, 5.49%, 13.81%, and 17.65%, respectively, for CRAC mixes prepared with N100-R0, N75-R25, N50-R50, N25-R75, and N0-R100 and an embedment length of 6𝑑 . Sarker [14], Romanazzi et al [25], Kathrival et al [44], and Kim and Park [45] reported that bond stress was decreased with the increasing diameter of the steel bar. This was attributed to the larger contact surface area between the reinforcing steel bar and the surrounding concrete, resulting in a distribution of the load over a larger contact area and consequently resulting in a reduction in bond stress.…”