Obla, Karthik H and Hill, Russell L and Thomas, Michael DA and Shashiprakash, Surali G and Perebatova, Olga (2003) Properties of concrete containing ultra-fine fly ash. In: ACI Materials Journal, 100 (5). pp. 426-433.Full text not available from this repository.
Fly ash and silica fume are two pozzolans that have been widely used for improved concrete strength and durability. Silica fume displays a greater pozzolanic reactivity than fly ash primarily due to its finer particle size. The reactivity of fly ash can be improved by reducing its particle size distribution. This paper discusses the fresh and hardened properties of concrete made with an ultra-fine fly ash (UFFA) produced by air classification. Durability testing for chloride diffusivity, rapid chloride permeability, alkali-silica reaction (ASR), and sulfate attack was also conducted It was found that at a given workability and water content, concrete containing UFFA could be produced with only 50% of the high-range water-reducer dosage required for comparable silica fume concrete. Similar early strengths and durability measures as silica fume concrete were observed when a slightly higher dosage of UFFA was used with a small reduction (10%) in water content.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to American Concrete Institute.|
|Keywords:||alkali-silica reaction;cracking;durability;fly ash;shrinkage; sulfate attack;workability.|
|Date Deposited:||25 Aug 2011 09:01|
|Last Modified:||25 Aug 2011 09:01|
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