UTILIZATION OF WASTE LIMESTONE DUST (LSD) WITH REPLACEMENT OF FINE AGGREGATES (FA) IN SELF-COMPACTED CONCRETE (S.C.C)

Abstract

The use of limestone dust in the construction industry has been increasing due to the benefits including good strength, low possibility of Alkali-Lime Stone dust reaction and the decrease in drying shrinkage in concrete.In our work, experiments were conducted on specimen mixtures of SCC of different proportions of fine limestone and FA. In SCC sample specimens there was replacement of fine aggregates and cement with lime stone dust. Various strength tests, workability tests and water absorption tests were performed were performed on sample specimens. These results were compared with the corresponding ordinary grades of concrete (SCC) and was accordingly summarized to what extent we can replace the fine aggregates and cement proportions. On observing the results, we concluded that there is increase in the compressive and flexural strengths when the limestone proportion is increased up to 15% in replacement with fine aggregates in the mixture. However, the compressive strength and flexure strength decreases if we replace more than 15% of fine and cement content. On top of that, replacement of fine aggregates and cement upto 15% has great impact on the economy of the project and at the same time, the lime stone dust produced finds its use in self-compacted concrete. There by reducing the demand of fine aggregates and providing alternate to the FA wherever possible.