Effect of Recycled Sand Content on Characteristics of Mortars and Concretes
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 4
Abstract
When recycled aggregate is used for concrete manufacture, in many cases these aggregates are accompanied by a recycled sand content. This research focuses on concretes prepared with recycled sand content. First, the research examined the effects of recycled sand content on the characteristics of mortar—density and compressive and flexural strength—by using recycled sand contents of 0, 5, 10, 15, 20, and 50%. Subsequently, the effect on the characteristics of recycled concretes made with a water/cement ratio of 0.50, when part of the recycled aggregate was replaced with recycled sand, was studied. The results obtained on mortars indicate that the use of up to 20% recycled sand caused a drop in the compressive and flexural strength. In concretes, the use of up to 100% recycled aggregate has no appreciable effect on compressive strength but does lower the modulus of elasticity, E, as the recycled aggregate content increases. If the recycled aggregate used in the manufacture of concretes contains up to 10% recycled sand, this sand has no appreciable effect on the compressive strength of the concrete, nor on its modulus of elasticity E.
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Acknowledgments
Thank you to the Ministry of Environment which supported and financed the RECNHOR project on recycled concrete, which was carried out by a group of researchers coordinated by Professor Pilar Alaejos of CEDEX and the additional research groups, headed by Professor Juan Antonio Polanco of the University of Cantabria, Professor Enrique Dapena of the Polytechnical University of Madrid, Professor Jose Luis Parra of LOEMCO, Professor Fernando Martinez of the University of Coruña, Professor Enric Vázquez of the Polytechnical University of Catalonia, and Professor Pedro Serna of the Polytechnical University of Valencia. Thanks also to SIKA, Portland-Valderrivas, and CEMEX for the significant support received for the completion of this work.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 4 • April 2011
Pages: 414 - 422
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jan 22, 2010
Accepted: Sep 24, 2010
Published online: Sep 27, 2010
Published in print: Apr 1, 2011
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