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The surface humidities of a limited set of field concretes during summer conditions in Ontario were measured prior to water absorption (sorptivity) testing. A series of alternative laboratory curing conditions was carried out on cores prior to laboratory sorptivity tests, to determine which would best mimic average field conditions (surface humidities greater than 40% and moisture contents greater than 1%). It was found that three days' oven drying at 50°C followed by sealed drying for four days at 50°C as suggested by Parrott worked well. In addition, the moisture content at test was calibrated to measured sorptivity results.
Implementation manager, Concrete Canada, West Toronto, Ontario
Professor, University of Toronto, Toronto, Ontario
Engineer, Agra Earth and Environmental, Scarborough, Ontario
Stock #: CCA10315J