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Title: Effects of duration of moist curing on concrete made with blended cements or pozzolans. Report 1, Laboratory investigations of 3/4 in. aggregate concrete
Authors: United States. Army. Office of the Chief of Engineers.
Tynes, W. O. (William O.)
Keywords: Aggregates
Concrete curing
Concrete testing
Portland cements
Portland pozzolan cements
Portland slag cements
Issue Date: Apr-1972
Publisher: Concrete Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-69-6 rept.1.
Description: Technical report
Abstract : Tests were made to determine if the 21-day moist-curing requirement for concrete containing a pozzolan, or natural cement, or made using type IV portland cement could be reduced to 14 days as required for type II portland cement and portland blast-furnace slag cement concrete. Seven air-entrained concrete mixtures containing 3/4-in.-maximum-size limestone aggregate were proportioned with 4 bags of cement per cu yd, an air content of 6 1/2, and a slump of 2-1/2 1/2 in. One of the seven mixtures was a reference mixture containing type II portland cement as the only cementitious material, while the other six were proportioned as follows: two mixtures with fly ash pozzolan (25 and 30% by absolute volume, respectively) and type II portland cement; one mixture with calcined shale pozzolan (25% by volume) and type H portiand cement; one mixture with natural cement (35% by volume) and type II portland cement; one mixture with a different type II cement (RC-555); and one mixture using portland blast furnace slag cement. Specimens made from each mixture were cured under six different curing conditions, and tested for dynamic modulus of elasticity, compressive strength, and resistance to freezing and thawing. The results of the freezing-and-thawing tests indicated that there was no significant difference between the 14- and 21-day moist-cured specimens tested at both 28 and 90 days age regardless of the cementing material of the mixtures. The strength values for the 21-day moist-cured specimens were somewhat higher than those of the specimens moist-cured 14 days. The results also indicated that low-strength air-entrained concrete can be durable if it has had an opportunity to dry before it is frozen.
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