Avaliação do emprego de carepa de aço como agregado miúdo em concreto

Abstract

Mill scale is a solid waste formed on the steel's surface during the lamination step of steel manufacture, usually deposited outdoors at steelmaking industries. This work aims to evaluate the use of mill scale in Portland cement concrete, as a replacement for natural fine aggregate. Concretes with mix proportioning 1:3,5, 1:5,0 and 1:6,5 were produced varying the mill scale content from 0% to 40%, with a given slump 110±10mm, for determination of compressive strength and water absorption. Concrete with mill scale has demanded greater water content to maintain the workability. The results indicated that concretes with water/cement ratios of 0.55 and 0.65 have a compressive strength reduction and greater water absorption as the mill scale content increases.