STUDY OF UTILIZATION OF WASTE MATERIALS TO ENHANCE THE PERMEABILITY OF HIGH STRENGTH CONCRETE

Abstract

HSC is a relative term, the definition of which may vary between two cities in the same country. In USA during 1950s concrete with a compressive strength of 34MPa was considered high strength. While recently concrete having compressive strength has high as 110MPa are used frequently.The advantage of HSC is small crosssection of structural elements resulting into reduction in cost and use of more space and improved engineering properties. The present work is done to study the water permeability of HSC using IS code method. Fly ash (F.A.) and silica fume (S.F.) were added individually and collectively to the cement by weight basis. The contents of silica fume and fly ash were varied from 5 to 15% when used individually and 10 to 20% when used collectively. The water to cement plus binder materials ratio wa varied from 0.35 to 0.39. In order to maintain a desired degree of workability of concrete, expressed in terms of compaction factor, a superplasticizer (Sulphonated Naphthalene Formaldehyde-SNF) was used @ 2% by weight of cement. The two types of aggregates viz. Crushed sand stone and granite were used. The specimens were tested for compressive and split tensile strengths and water permeability after 28 days of curing. The percent inclusion of fly ash, silica fume and fly ash plus silica fume by weight of cement and types of aggregate were the main parameters of the study