Effect of natural admixture on durability properties of conventional and Class C fly ash blended concrete
  T.S. Ramesh Babu and D. Neeraja
  This paper is based on the research work on durability studies of Conventional Concrete (CC) and Class C Fly Ash (FA) blended concrete with and without Natural Admixture (NAD). For Natural Admixture, the white albumen and yellow yolk of a broiler hen egg was used. Cement was replaced by Class C fly ash at various levels of 0%, 25%, 35% and 45% by its mass. NAD was added to concrete at different replacement dosages of 0%, 0.25%, 0.5% and 1.0% by its volume to water content and the liquid to binder ratio was maintained as 0.5. For all replacement levels of FA and NAD, the compressive strength and durability studies viz water absorption, porosity and acid attack of CC and FA were studied at 7, 28 and 56 days. It was concluded that 0.25% of NAD dosage was considered as optimum dosage for both CC and Class C fly ash blended concrete from the compressive strength and durability tests. The studies revealed that 25% Class C fly ash blended concrete mix with 0.25% NAD showed less water absorption and porosity. Further, it displayed reduced percentage loss of compressive strength when immersed in HCL and H2SO4.
 

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