Study on the Bond Slip Behaviour of Geopolymer and Conventional Concretes after Exposure to Different Temperatures

Abstract

Concrete is the most widely used construction material across the globe. newlineBond-slip behaviour of steel in concrete is a major factor for the structural design of newlineRCC members. newlineOn many occasions, concrete is exposed to elevated temperatures like that of newlinefire, furnaces, etc. It is a proven fact that, the strength and other performance of newlineconcrete is affected when it is exposed to elevated temperatures. So it is vital to newlineunderstand the behaviour of concrete and structural members after exposure to newlineelevated temperatures. newlineThe research in the area of geopolymer concrete has gained momentum in the newlinerecent years primarily due to its role in reducing greenhouse gas emission compared newlinewith OPC concrete. Studies in the past confirm that geopolymer concrete shows newlinebetter performance in terms of strength and durability when compared with OPC newlineconcrete. newlineMany researchers reported the bond-slip behaviour of OPC concrete both at newlineambient temperature and after exposure to elevated temperatures. However, limited newlineinformation is available about the bond-slip behaviour of geopolymer concrete under newlinethe said temperature exposure conditions. newlineHence, it has been proposed to study the bond-slip behaviour of geopolymer newlineconcrete, at ambient temperature and after exposure to elevated temperatures and to newlinecompare the properties with those of corresponding conventional concretes. A newlinestandard pull-out test, as per Indian standard specifications, was conducted for the newlinepresent study. For the geopolymer concrete, the aluminosilicate material considered newlinefor the present study was fly ash and the alkali activators were a combination of newlinesodium silicate and sodium hydroxide.This study considers the partial replacement of GGBS so newlinethat the geopolymer concrete would not require temperature curing. newline newline