Shielding Properties of Heavyweight Concrete.

Document Type : Research Studies

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Structural Engineering Department., Faculty of Engineering., El-Mansoura University., El-Mansoura., Egypt

Abstract

 Heavyweight concrete can be used when particular properties, such as combined high strength and good radiation shielding, are required. Such concrete, using Ilmenite aggregates, can have a density in the range 4.2 t/m3, significantly higher than the density of concretes made with normal aggregate. The present paper deals with sand-llmenite heavy weight concrete, llmenite has been used as coarse aggregate because of high specific gravity compared with gravel. In the present work, 21 mixes were selected to achieve a slump above 5± 2 cm and strength up to 40 MPa at 56 days. The investigation used three levels of fine aggregates to total aggregates ratio (0.25, 0.4, 0.48), three cement content (350, 400, 450 kg/m3) and four levels of llmenite aggregate to total coarse aggregate (gravel + Ilmenite) ratio (0.25, 0.5, 0.75, 1) were used. The investigation provided information on compressive strength, shielding properties and indicated clear benefits from the use of lImenite as a coarse aggregate. For all type of coarse aggregate (gravel, Ilmenite), increasing the amount of fine aggregate leads to reduction in each of compressive strength and absorption co-efficient. Replacing the gravel with llmenite yields about 35% increase in absorption co-efficient. 

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