Effect of Steam Curing on Class C High-Volume Fly Ash Concrete Mixtures

This article reports on a study of the effect of steam curing on concrete incorporating class C fly ash (FA), which is widely available in Turkey. The mechanical properties of fly ash concretes, incorporating 0% to 70% fly ash as a cement replacement material, were investigated under different curing conditions up to 90 days. Concrete mixtures with 360 kg/m3 cementitious content and a constant water/binder ratio of 0.4 were made. The curing conditions were standard curing in water, curing in laboratory atmosphere, and steam curing. The soundness of high volume fly ash (HVFA) concretes was determined with the expansion of mortar bar specimens. Compressive strength of concrete, volume stability of mortar bar specimens, and setting times of pastes were investigated. Results show that, under standard curing conditions, only the 1-day strength of fly ash concrete was low. At later ages, the strength values of even 50% and 60% fly ash concretes were satisfactory. Steam curing accelerated the 1-day strength but the long-term strength was greatly reduced. Setting time of fly ash-cement pastes and volume stability of mortars with 50% or less fly ash content were found to be satisfactory for standard specimens. The authors conclude that HVFA concrete mixtures are suitable for use by the Turkish construction industry for both cast-in-place and precast concrete products. However, steam curing will be required to develop adequate compressive strength for form removal at age 1 day.

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  • Authors:
    • Yazici, Halit
    • Aydin, Serdar
    • Yigiter, Huseyin
    • Baradan, Bulent
  • Publication Date: 2005-6


  • English

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  • Accession Number: 01002950
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 2005 9:43AM