Studies into the use of fly ash in concrete for water dam structures


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Title: Studies into the use of fly ash in concrete for water dam structures

Author(s): Veljko Korac and Velimir Ukraincik

Publication: Special Publication

Volume: 79


Appears on pages(s): 173-186

Keywords: hydration cements; (in conc re blended cements; compressive strength; fly ash; he -- mass concrete; portland cements; Portland pozzolan setting (hardening); slag cements; temperature rise te), at of

Date: 5/1/1983

The paper describes investigations undertaken to develop a suitable fly ash blended Portland cement for concrete used in two large water dam projects in Yugoslavia, which have recently been completed. The fly ash selected for this purpose is produced at a power station using brown coal with combustion temperatures 1550-1600°C, as compared to other Yugoslavian power stations using lignite coal with combustion temperatures generally in the range of lOOO-12OO°C. It was shown that the combustion temperature is the single most important factor in controlling the quality of fly ash, with excellent physical and pozzolanic properties being produced at higher temperatures. A fly ash content (F) of 50% in Portland cement (C), i.e. F/(F+C) = 0.50, was selected for these projects, as it was shown to be the most suitable blend with regard to the heat of hydration, setting time, consistency and soundness properties. A concrete mix with 225 kg/m3 of this fly ash blended Portland cement and aggregate of maximum size 63 mm (24 in) was adopted and both the laboratory and site tests showed this mix to possess good properties in the fresh and hardened states. A comparison of these results was made with the comparable concrete prepared with commercially available Portland cement and slag cement, and the use of fly ash blended Portland cement was found to be advantageous.