Rusting of Metallic Surface Hardeners: Case History
Publication: Journal of Performance of Constructed Facilities
Volume 14, Issue 1
Abstract
Sprinkled surface hardeners are incorporated into freshly placed concrete slabs while high-strength overlays are placed on a previously poured new concrete slab or an existing deteriorated slab, providing improved abrasion and impact resistance. Metal filings are combined with cement corrosion inhibitors and water-reducing admixtures. Depending on the intended application, the metallic particles may either be treated with chemicals or directly sieved and graded. Rusting of metallic surface hardeners can occur when the installation of these products or the conditions during installation are not closely controlled. Visual tests, including microscopy and chemical analysis, were employed to investigate some of the potential factors that contribute to the rusting problem. Observations and possible causes contributing to the rusting and debonding problems are identified: (1) a decrease in the alkalinity of the cement paste due to carbonation; (2) exposure of unprotected metallic particles to air during the brushing procedure; and (3) timing of the finishing operations.
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References
1.
Jolicoeur, C., Nkinamubanzi, M. A., Simard, M. A., and Piotte, M. (1994). “Progress in understanding the functional properties of superplasticizers in fresh concrete.” 4th Int. CANMET/ACI Conf. on Superplasticizers and Other Chemical Admixtures, American Concrete Institute, 63–88.
2.
Kondo, R. L., and Daimon, M. (1972). “A review of the mechanisms of set-retardation in portland cement pastes containing organic admixtures.” Cement and Concrete Res., 415–433.
3.
Mailvaganam, N. P. ( 1994). “Miscellaneous admixtures,” Chapter 16, Concrete admixtures handbook, V. Ramachandran, ed., Noyes Publications, Park Ridge, N.J.
Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 14 • Issue 1 • February 2000
Pages: 5 - 10
History
Received: May 20, 1999
Published online: Feb 1, 2000
Published in print: Feb 2000
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