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Title: Corrosion Induced Cracking in Concrete Exposed to a South Africa Inland Environment

Author(s): Jacob Olumuyiwa Ikotun

Publication: Symposium Paper

Volume: 326


Appears on pages(s): 80.1-80.10

Keywords: carbonation, concrete, corrosion, steel radius loss, cover depth, oxygen permeability index (OPI)

DOI: 10.14359/51711063

Date: 8/10/2018

This study investigated the influences of concrete quality (water/binder ratio (0.60 and 0.95)), binder type (100% Portland cement (PC), 30/70 PC/fly ash (FA) and 50/50 PC/ blast furnace slag (BS)) and cover depth (12 mm, 20 mm and 30 mm) on carbonation-induced corrosion steel radius loss required for cracking the pre-carbonated RC specimens exposed to the South Africa inland natural unsheltered environment and time to cracking of the concretes. The quality of the concretes was quantified using a durability index parameter (28-day oxygen permeability index). The results indicate that the steel radius loss required for corrosion induced cracking of the concretes and their cracking time are sensitive to variation in the concrete quality and cover depth. In all the concretes, steel radius loss required for cracking increased with increasing cover depth. Moreover, the steel radius loss required for cracking decreased with the decreasing w/b ratio and the highest steel radius loss was found with the BS blended concretes and followed by the FA blended and PC concretes.