Substitution of Fly Ash, Slag, and Admixtures in FDOT Concrete Mixture Proportions


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Title: Substitution of Fly Ash, Slag, and Admixtures in FDOT Concrete Mixture Proportions

Author(s): Y. Jin and N. Yazdani

Publication: Special Publication

Volume: 209


Appears on pages(s): 347-368

Keywords: admixtures; fly ash; hot weather concrete; slag

Date: 9/26/2002

Norida Department of Transportation (FDOT) requires contractors to submit proposed concrete mixture proportions prior to the production of any concrete. The contractor must use mixture proportions approved by FDOT. Substitutions of ingredients, other than coarse aggregate, must be justified through trial mixtures, and authorized in writing by FDOT Engineers. The substitutions of fly ash, slag, air-entraining admixtures, and 'I).pcs A, D and G water reducing admixtures were performed on two typical FDOT hot weather mixture proportions in this study. The concrete properties considered were slump, air content, and compressive strength. Test data for substitution mixture propohons were compared with the data for the original mixture proportions on the basis of statistical criteria. Results show that the substitutions cause significant change in concrete properties for the fly ash mixture proportions. The substitution of slag and air-entraining agent in the slag mixture proportions does not cause significant change in the properties of concrete.