Strength Development of Concrete Cured under High Temperature Conditions at Early Age

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Title: Strength Development of Concrete Cured under High Temperature Conditions at Early Age

Author(s): H. Sugiyama, Y. Masuda, and M. Abe

Publication: Special Publication

Volume: 192

Issue:

Appears on pages(s): 965-982

Keywords: curing; high-early-strength cements; high temperature; low-heat cements; portland cement; strength

Date: 4/1/2000

Abstract:
This paper describes a study on the long-term strength development of concrete cured under high-temperature conditions at an early age. The concrete specimens were made with normal portland cement, high-early-strength portland cement, and low-heat portland cement, and were cured under 26 different temperature conditions. The temperature conditions were set so as to give systematic variations in the maximum temperature and the initial curing time. The strength development of concrete was examined over a period from 1 to 365 days. It was clarified that a higher maximum temperature improved the strength development of concrete at an early age, but inhibited the strength development of concrete at later ages. A shorter initial curing time inhibited the strength development of concrete at later ages. A time dependence of the effect of curing temperature on the strength development of concrete was observed. For concrete made with normal portland cement, a higher temperature during the period from 0 to 12 hours after mixing results in lower strength development after 3 days. For concrete made with high-early -strength portland cement, a higher temperature during the period from 0 to 3 hours after mixing results in lower strength development after 1 day. For concrete made with low-heat portland cement, a higher temperature during the period from 0 to 12 hours after mixing results in lower strength development after 7 days, but a higher temperature after 72 hours results in greater strength development at later ages.