Rational Procedure for Composition of Screed Mortar with Recycled Sand at a Construction Site
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 5
Abstract
The aim of this work is to present a rational procedure for the composition of screed mortar with recycled sand at a construction site. Seven samples of construction and demolition waste were collected and milled in a hammer mill. The properties of the recycled sands were analyzed: water absorption, material finer than 75 μm, bulk density, fineness modulus, and presence of contaminants. Mortars were produced with different amounts of cement and by replacing the natural sand with recycled sand in the proportions of 50, 75, and 100% by mass. These mortars were characterized for tensile and compressive strength, density, and consistence. The screed mortars were applied over a concrete base and their performance was evaluated with regard to cracking, bond tensile strength, and impact resistance. Several correlations were obtained between the properties of aggregates, mortar, and screed, leading to a proposed methodology for recycling, dosage, and quality control of screed mortar prepared with recycled sand at a construction site. It is recommended for the screed mortar to have a cement consumption between 250 and and for the total amount of material finer than 75 μm to be lower than 28%.
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Acknowledgments
The authors thank CNPq for the research financial support, the student Elaine C. R. Silva, the technicians Ezequiel and Cazuza, of UFPE Laboratory of Construction Material, the technicians Antonio e Severino, UFPE Laboratory of Soils, the UFPE Department of Civil Engineering, UFPE Laboratory of Mechanics, especially professor Armando Shinohara and the student Cidrak and the Construction Companies Romarco and Pernambuco, from Recife, for the partnership in this research.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 5 • May 2014
Pages: 855 - 862
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Sep 17, 2012
Accepted: Jun 13, 2013
Published online: Apr 15, 2014
Published in print: May 1, 2014
Discussion open until: Sep 15, 2014
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