Recycling of scale and steel chips waste as a partial replacement of sand in concrete

Construction and Building Materials, Volume 28, Issue 1, March 2012, Pages 157-163
Mohamed Alwaeli, Jan Nadziakiewicz

Silesian University of Technology, Department of Technologies and Installations for Waste Management, Konarskiego 18 Str., 44-100 Gliwice, Poland

Abstract

Modification of concrete properties by the addition of appropriate materials is a

popular field of concrete research. This study is focusing on the use of selected waste of iron and steel industry (steelchips and scale) as apartialreplacement for sand in the production of concrete. In this research study, concretes were made with steelchipsscale (ScC) and (SchC) as substitution for raw sand. Sand was replaced by these waste in different proportions (25%, 50%, 75%, and 100%) by weight of sand.

The aim of this study is to investigate the compressive strength and absorption properties for

gamma radiation of concrete with steelchips and scalewaste as apartialreplacement for sand. The tests results obtained from concretes produced with

scale and steelchips were compared with those in conventional concrete (CC-0).

The experimental results indicate that, the addition of these waste to concrete enhances the

absorption of gamma radiation without impairing other technical features of the investigated

concrete. The data shows, that the concrete mixed with steelchips have better strength than

conventional concrete, while in the case of concrete mixed with scale in excess of 25%, the strength become deteriorated. The linear attenuation coefficient of gamma radiation of concrete with a mixture of scale and steelchips with 75% and 100% was very good while the rest have good and satisfying radiation properties. Consequently, concrete prepared from the iron and steel industry solid waste containing steelchips and scale could be preferred for buildings as shielding concretes against gamma radiation. In this research the thickness of the concrete shield which can be used instead of the conventional concrete was also calculated.

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