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Chloride Diffusion in Blended Cement Concrete Made with Quartzite Recycled Aggregate

Published online by Cambridge University Press:  22 November 2012

Claudio J. Zega ,
Yury A. Villagrán-Zaccardi  and
Ángel A. Di Maio
Claudio J. Zega
Affiliation:
LEMIT, 52 e/121 y 122, (1900) La Plata, Argentina CONICET, Argentina
Yury A. Villagrán-Zaccardi
Affiliation:
LEMIT, 52 e/121 y 122, (1900) La Plata, Argentina CONICET, Argentina
Ángel A. Di Maio
Affiliation:
LEMIT, 52 e/121 y 122, (1900) La Plata, Argentina CONICET, Argentina
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Abstract

Using waste materials as aggregate for new concrete production is a growing tendency, because of several environmental problems. Recycled coarse aggregate (RCA) obtained from crushing waste concrete has lower density and greater absorption than natural aggregate, because of the higher porosity of the mortar attached to the RCA particles. Compressive strength level achieved in recycled concrete may be similar to that of conventional concrete. On the other hand, durable performance of recycled concrete is variable, and diverse evidence can be found in literature for different durability issues. In this paper, chloride ingress in conventional and recycled concrete, made with quartzite aggregate and blended Portland cement is evaluated when immersed in NaCl solution. Two strength levels (21 and 35 MPa) and two contents of RCA (25 and 75%), as substitute of natural quartzite aggregate, were considered. The chloride diffusion coefficient and the relationship between water-soluble chloride and bound chloride are analyzed.

Keywords

compositewaste managementblend
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1488: Symposium 7B – Concrete with Smart Additives and Supplementary Cementitious Materials , 2012 , imrc12-1488-7b-009
Copyright
Copyright © Materials Research Society 2012 

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References

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