Effect of Metakaolin and Slag blended Cement on Corrosion Behaviour of Concrete

Abstract

Abstract. The present paper is aimed to investigate the influence of Metakaolin (MK) and Portland slag Cement (PSC) on corrosion behaviour of concrete. For this purpose, Ordinary Portland Cement (OPC) was replaced by 15% MK by weight and readymade available PSC were used. The standard concrete specimens were prepared for both compressive strength and half-cell potential measurement. For the aforesaid experiments, the specimens were cast with varying water to binder ratios (w/b) such as 0.45, 0.5 and 0.55 and exposed to 0%, 3%, 5% and 7.5% of sodium chloride (NaCl) solution. The specimens were tested at wide range of curing ages namely 7, 28, 56, 90 and 180 days. The effects of MK, w/b ratio, age, and NaCl exposure upon concrete were demonstrated in this investigation along with the comparison of results of both MK and PSC concrete were done. It was also observed that concrete with MK shows improved performance as compared to concrete with PSC.

http://mit.imt.si/Revija/izvodi/mit195/xiao.pdf

“…Multiple corrosion studies have been conducted for mortars or concretes made of blended cements. [5][6][7][8][9][10][11][12][13][14] Most of them focus on the additions of silica fume, fly ash and slag, with half-cell potential and linear polarization techniques being mostly used to determine the corrosion activity in the concrete or mortar. All the studies report on blended cements increasing the corrosion resistance due to the latent pozzolanic reaction.…”