Blast Furnace Slag and Fly Ash Additives

Date Started: 2003

Budget: $62,793

Sponsor: Federal Highway Administration, Washington, DC

Performing Organization: University of Arkansas, Fayetteville University of Arkansas, Fayetteville

Description: The research program will examine the effects of replacing large percentages of cement with BFS on the fresh and hardened properties of concrete. The program would also investigate the concrete properties of mixtures containing both fly ash (FA) and blast furnace slag (BFS). Included in the research would be examining various grades of BFS and cement sources. The concrete properties examined would include but are not limited to compressive strength (early age and long term), permeability, and the fresh concrete properties. The effect of large quantities of cementitious materials on the dosage rate of admixtures (particularly air entraining agents and high range water reducers) will also be examined. Using the results from the research, a final specification for using BFS and/or fly ash in concrete pavements and structures will be finalized. This specification will provide an upper limit for BFS and an upper limit for concrete mixtures containing both BFS and fly ash.