Vol. 6, No. 9-10, 2011

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ISSN: 1559-3959
Effect of adding crumb tire rubber particles on the mechanical properties of DCPD-modified sulfur polymer mortars

Hamed Maraghechi, Iman Fotovat Ahmadi and Siamak Motahari

Vol. 6 (2011), No. 9-10, 1283–1294
Abstract
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Sulfur polymer mortars are composite materials in which modified sulfur is the binder while sand and other fillers are used as aggregates. Sulfur-based composite materials are characterized by their high chemical and mechanical properties along with fast setting behavior. However, sulfur modification is essential in order to achieve sulfur mortars with enhanced characteristics. In this study, incorporation of crumb tire rubber in dicyclopentadiene-modified sulfur-based mortars, as some replacement of sand, is evaluated. Use of crumb tire rubber influences the compressive stress-strain behavior of the mortars significantly. While the compressive strength of the rubber-added mortars is reduced dramatically, the postpeak response of the mortars is of the great interest. Use of a reactive-mixing method improves the compressive strength of rubber-added sulfur polymer mortars up to approximately 25%. Scanning electron microscopy observations confirm better adhesion between the rubber particles and sulfur polymer matrix via reactive mixing. Furthermore, it is clarified that the crumb tire rubber type and presence of a curing agent during the mortar preparation process affect the mechanical properties of the sulfur mortar.

Keywords
sulfur polymer mortar, modified sulfur binder, crumb tire rubber, ductile behavior, allotropic transformation
Milestones
Received: 23 November 2010
Revised: 4 April 2011
Accepted: 9 May 2011
Published: 15 January 2012
Authors
Hamed Maraghechi
Department of Civil and Environmental Engineering
Pennsylvania State University
3127 Research Drive
State College, PA, 16803
United States
Iman Fotovat Ahmadi
Department of Chemical Engineering
College of Engineering
University of Tehran
P.O. Box 11365-4563
Tehran
Iran
Siamak Motahari
Department of Chemical Engineering
College of Engineering
University of Tehran
P.O. Box 11365-4563
Tehran
Iran