Abstract
Silica fume and fly ash are used to replace 10% of cement by weight. They are used either separately or in combination with quarry dust in the concrete mixes. Quarry dust is incorporated to replace 20% and 40% of sand in the respective mixes. Superplasticizer and air entraining admixture are used as chemical admixtures to control the flowability of fresh concrete. This chapter focuses on the physical properties of fresh concrete mixes that are monitored batch by batch. The properties of fresh mixes are determined in respect of slump, slump flow, V-funnel flow, air content, mix temperature, and unit weight. It is observed that the properties, particularly, the flow and the entrained air content are influenced by the presence of mineral and chemical admixtures. In presence of superplasticizer, silica fume provides better flow properties than fly ash. Besides, the incorporation of quarry dust improves the flowability of fresh mixes. The outcome of the study given in the chapter suggests the use of quarry dust as partial replacement of sand to augment the flowability of high performance concrete.
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