Please use this identifier to cite or link to this item: http://hdl.handle.net/10321/3399
Title: Experimental investigations on the effect of concrete quality, exposure conditions and duration of initial moist curing on carbonation rate in concretes exposed to urban, inland environment
Authors: Otieno, Mike 
Ikotun, Jacob 
Ballim, Yunus 
Keywords: Carbonation rate;Corrosion;Inland environment;Curing
Issue Date: 12-Feb-2020
Publisher: Elsevier
Source: Otieno, M., Ikotun, J., Ballim, Y. 2020. Experimental investigations on the effect of concrete quality, exposure conditions and duration of initial moist curing on carbonation rate in concretes exposed to urban, inland environment. Construction and Building Materials. 246: 1-9. doi:10.1016/j.conbuildmat.2020.118443
Journal: Construction and building materials; Vol. 246 
Abstract: This paper reports an investigation on the influence of inland exposure conditions, concrete quality and
cover depth on carbonation-induced corrosion initiation of steel in concretes exposed to urban, inland
environment. 100 mm concrete cube specimens of were prepared using five types of binder namely plain
Portland cement (CEM I 52.5 N, PC), 70/30 PC/FA (fly ash), 50/50 PC/BS (blast furnace slag), 90/10 PC/SF
(silica fume) and 60/30/10 PC/BS/SF at three w/b ratios of 0.40, 0.60 and 0.95. For all the concretes, two
companion sets of specimens were cast and cured for 7 and 28 days before being exposed to natural
indoor, outdoor-sheltered and outdoor-unsheltered environments. Concrete quality was characterized
using water sorptivity and oxygen permeability. Carbonation depths were measured at 6-month intervals
up to 2 years. The results show that as the quality of the concrete increases the rate of carbonation rate
decreases. The results also show that carbonation rate is more sensitive to concrete quality (binder type
and w/b ratio) than duration of curing. The indoor-exposed specimens exhibited higher carbonation rates
than the corresponding outdoor-exposed concretes. Blended cement concretes showed higher carbonation
rate than to the plain PC concretes. An empirical carbonation rate prediction model incorporating
both gas permeability and water sorptivity as input parameters is proposed.
URI: http://hdl.handle.net/10321/3399
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2020.118443
Rights: Copyright: 2020. Elsevier. Due to copyright restrictions, only the abstract is available. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in Construction and Building Materials, Vol 246, 1183, https://www.sciencedirect.com/science/article/abs/pii/S0950061820304487
Appears in Collections:Research Publications (Engineering and Built Environment)

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