Laboratory study of high performance curing compounds for concrete pavements : phase I.
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2012-06-01
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Edition:Final report.
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Abstract:Three emulsion-type and two sealing-type curing compounds were evaluated for their ability to impart freezethaw
scaling resistance, and restrict evaporation, carbonation and chloride penetration to concrete specimens
prepared to represent common pavement situations. Two coarse aggregate types and three cementitious
material situations were the main variables in addition to the five membrane forming curing compounds
(MFCC’s). The final finishing and curing compound applications occurred at a fixed-time of two hours after
casting. Coarse aggregate type had little or no influence on the results but the effectiveness of the MFCCs
varied with the mix type. Slag cement and fly ash mixtures displayed considerably higher levels of scaling than
the ordinary portland cement mix. In addition to the base durability of each type of concrete, observed
differences were also likely the result of different levels of paste moisture at the surface at the time the curing
compounds were applied. The moisture sealing ability of the curing compounds did not correlate with the
tendency to protect from freeze-thaw scaling, suggesting that the MFCCs alter the surface layer of the concrete
in multiple ways. Overall the acrylic sealing compound provided the best protection. The interaction between
the MFCC and the concrete surface is complex. These results show it is not simply a question of the
effectiveness of the MFCC in sealing but rather a question of the resulting microstructure at the surface of the
concrete following application of the MFCC. Thus effective concrete curing guidelines should consider the mix
type and the state of the concrete surface at the time of MFCC application.
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