DURABILITY STUDIES ON REPLACEMENT OF FINE AGGREGATES AS CSFB IN CONCRETER. Srinivasan and S. Keerthinarayana
In this paper, the effects of crushed spent fire bricks (CSFB) as fine aggregate replacement material on the chloride resisting properties, important to durability of concrete structures have been studied. CSFB have been used up to 60% replacement by volume of fine aggregate with fixed water to binder ratio of 0.45. The properties of concrete investigated include water absorption, volume of permeable voids, permeability, chloride penetration depth, resistance to chloride ion penetration in terms of total charge passed in coulombs and XRD analysis. The specimens incorporating CSFB, when exposed to chloride solution exhibit significantly lower charge passed value and lesser chloride diffusion for all fine aggregate replacement levels (FARL). An overall result indicates that CSFB (25-30% FARL) blended concretes showed superior durability properties.
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