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Materials 2014, 7(6), 4739-4754; https://doi.org/10.3390/ma7064739

Influence of Aggregate Coated with Modified Sulfur on the Properties of Cement Concrete

1
Department of Civil Engineering, University of Texas at Arlington, Arlington, TX 76019, USA
2
School of Civil Engineering, Chungbuk National University, Chungbuk 361-763, Korea
3
Railway Inspection Section, Korea Infrastructure Safety & Technology Corporation, Gyeonggi 411-758, Korea
*
Author to whom correspondence should be addressed.
Received: 21 April 2014 / Revised: 10 June 2014 / Accepted: 10 June 2014 / Published: 20 June 2014
(This article belongs to the Special Issue Recycled Materials)
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Abstract

This paper proposes the mixing design of concrete having modified sulfur-coated aggregate (MSCA) to enhance the durability of Portland cement concrete. The mechanical properties and durability of the proposed MSCA concrete were evaluated experimentally. Melting-modified sulfur was mixed with aggregate in order to coat the aggregate surface at a speed of 20 rpm for 120 s. The MSCA with modified sulfur corresponding to 5% of the cement weight did not significantly affect the flexural strength in a prism concrete beam specimen, regardless of the water-cement ratio (W/C). However, a dosage of more than 7.5% decreased the flexural strength. On the other hand, the MSCA considerably improved the resistance to the sulfuric acid and the freezing-thawing, regardless of the sulfur dosage in the MSCA. The coating modified sulfur of 5% dosage consequently led to good results for the mechanical properties and durability of MSCA concrete. View Full-Text
Keywords: modified sulfur; coated aggregate; durability; strength; freezing-thawing; acid resistance modified sulfur; coated aggregate; durability; strength; freezing-thawing; acid resistance
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Lee, S.-H.; Hong, K.-N.; Park, J.-K.; Ko, J. Influence of Aggregate Coated with Modified Sulfur on the Properties of Cement Concrete. Materials 2014, 7, 4739-4754.

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