Title:
Substitution of Fly Ash, Slag, and Admixtures in FDOT Concrete Mixture Proportions
Author(s):
Y. Jin and N. Yazdani
Publication:
Symposium Paper
Volume:
209
Issue:
Appears on pages(s):
347-368
Keywords:
admixtures; fly ash; hot weather concrete; slag
DOI:
10.14359/12509
Date:
9/26/2002
Abstract:
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.