| The need for supplementary cementitious materials to replace cement has become increasingly important. Processing and environmental impacts make cement a costly material to manufacture. Strength and durability performances of concrete with supplementary cementitious materials, such as silica fume, fly ash and slag, were investigated. It was found that under normal (room temperature) conditions, concrete incorporating silica fume had the highest strength. However, when subjected to wet and dry conditions, concrete containing fly ash and slag showed the greatest strength improvement over the control specimens. When specimens of the same mixes were subjected to rapid freezing and thawing, control samples showed the greatest resistance. Beams with fly ash performed quite poorly due to freeze and thaw exposure. Beams with 8% silica fume showed the best performance among single admixture mixes. It was shown that the splitting tensile strength of cylinders ranged between 11 and 16% of the compressive strength. |
