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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Effects of Elevated Temperature on the Strength Development and Microstructure of High-Performance Concrete with Fly Ash
Author(s): K.-B. Park and T. Noguchi
Publication: Special Publication
Appears on pages(s): 1075-1086
Keywords: compressive strength; fly ash; high-performance concrete;temperature
Abstract:The objective of this paper is to study the effects of the elevated internal temperature on the strength development and microstructure of high performance concrete with 40 % fly ash in mass structures. The concrete walls were designed using three different depths, being 1.5 m, 0.8 m, and 0.3 m. Temperature histories at different locations in the walls were recorded and the strength development of concrete at those locations was measured. In addition, the change of the degree of hydration, hydration products, and microstructure development of concrete at the different locations were investigated. Test results indicated that high elevated temperatures in mass concrete structures with fly ash significantly accelerate the strength development of concrete at the early ages, while the long-term strength development is decreased. The long-term strength loss is caused by the reduction of the degree of hydration and increased the total porosity and amount of smaller pores. The use of fly ash in mass concrete structure reduces the detrimental effect of high curing temperature on the strength development of concrete.
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