Resistance of Scoria-Based Blended Cement Concrete against Deterioration and Corrosion in Mixed Sulfate Environment
Publication: Journal of Materials in Civil Engineering
Volume 21, Issue 7
Abstract
The use of blended cements incorporating supplementary cementing materials and cements with low content is becoming common to prevent the deterioration of concrete structures subjected to aggressive environments. This paper presents the results of an investigation on the performance of finely ground volcanic scoria (VS)-based ASTM Type I and Type V (low ) blended cement concrete mixtures with varying immersion periods of up to in environments characterized by the presence of mixed magnesium–sodium sulfates. The concrete mixtures comprise a combination of two Portland cements (Types I and V) and two VS-based blended cements with two water-to-binder ratio of 0.35 and 0.45. Background experiments (in addition to strength and fresh properties) including X-ray diffraction (XRD), differential scanning calorimetry (DSC), mercury intrusion porosimetry (MIP), and rapid chloride permeability (RCP) were conducted on all concrete mixtures to determine phase composition, pozzolanic activity, porosity, and chloride ion resistance. Deterioration of concrete due to mixed sulfate attack and corrosion of reinforcing steel were evaluated by assessing concrete weight loss and measuring corrosion potentials and polarization resistance at periodic intervals throughout the immersion period of . Plain (Type I/V) cement concretes, irrespective of their content, performed better in terms of deterioration and corrosion resistance compared to Type I/V VS-based blended cement concrete mixtures in mixed sulfate environment.
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Acknowledgments
The writer is grateful to the Papua New Guinea (PNG) Halla Cement Factory, PNG Department of Works, Gazella Restoration Authority of Rabaul (PNG), and PNG Ready Mixed Concrete Co. Ltd. for their support.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 21 • Issue 7 • July 2009
Pages: 299 - 308
Copyright
© 2009 ASCE.
History
Received: Oct 17, 2006
Accepted: Jan 22, 2009
Published online: Jun 15, 2009
Published in print: Jul 2009
Notes
Note. Associate Editor: Zhishen Wu
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