Effect of Curing Temperature on Hardened Concrete Properties: Mixtures of Ground Granulated Blast Furnace Slag, Fly Ash, or a Combination of Both (05-2637) - MP-11**
W. Micah Hale, University of Arkansas, Fayetteville
Thomas D. Bush, Frankfurt Short Bruza Associates
Bruce W. Russell, Oklahoma State University
Seamus F. Freyne, Manhattan College

Often concrete is not mixed or placed in ideal conditions. Particularly in winter or summer months, the fresh concrete temperature is quite different than concrete mixed in laboratory conditions. This paper examines the influence of supplementary cementitious materials on the strength development of concrete subjected to different curing regimens. The supplementary cementitious materials used in the research program were ground granulated blast furnace slag (GGBFS), fly ash, and a combination of both materials. The three curing regimens employed were; hot weather curing, standard curing, and cold weather curing. Test results show that the addition of GGBFS at a relatively low replacement rate can improve the hardened properties for each curing regimens. This improvement was noticeable not only at later ages, but at early ages too. Mixtures containing both materials (GGBFS and fly ash) performed as well and in most cases better than mixtures containing only portland cement at all curing regimens.