Carbonation depth measurement of concretes exposed to different curing and preconditioning conditions, using image-processing tools

Conference Object
Change log
Forsdyke, JC 
Lees, JM 

Specimens of two concretes with different water/cement ratios are subject to various curing and pre-conditioning regimes before being placed in accelerated carbonation conditions. Their carbonation depths are revealed using a phenolphthalein indicator, with image-processing tools used to reduce measurement time, improve accuracy, and eliminate subjectivity of measurements. The results show that specimens cured in water for 28 days show a reduced carbonation depth when compared with those cured in air. Preconditioning with oven-treatment decreased the clarity in the observed carbonation front and had inconsistent effect on the carbonation depth. Image-processing tools were found to be a useful method of consistently measuring carbonation depth using a fixed threshold, particularly in this case where the indication is ambiguous.

Journal Title
fib Symposium
Conference Name
2nd fib Symposium on Concrete and Concrete Structures
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Volume Title
Engineering and Physical Sciences Research Council (EP/N017668/1)
Engineering and Physical Sciences Research Council (EP/N509620/1)
EPSRC established Career Fellowship titled ‘‘Tailored Reinforced Concrete Infrastructure: Boosting the innate esponse to Chemical and Mechanical Threats” [reference number: EP/N017668/1] and the Doctoral Training Partnership [reference number: EP/N509620/1]