Title:
ASR-Related Distress in Floor Coatings
Author(s):
Xiaoqiang (Hugh) Hou, Richard A. Cechner, Terrence M. McGovern, Kevin A. Michols, and Todd Nelson
Publication:
Concrete International
Volume:
41
Issue:
11
Appears on pages(s):
26-29
Keywords:
blister, aggregate, surface, flooring
DOI:
10.14359/51721345
Date:
11/1/2019
Abstract:
Blistering of flooring in three buildings was found to be due to alkali-silica reaction (ASR) in the near-surface concrete. High moisture conditions, caused by impermeable flooring acting as a vapor retarder (allowing condensation to form near the surface), and high alkalinity near the slab surface affected reactive particles in the concrete aggregates. The authors discuss findings of their investigations and provide necessary steps in proper ASR determination.
Related References:
1. Taylor, H.F.W., Cement Chemistry, second edition, Thomas Telford Publishing, London, UK, 2007, pp. 361-367.
2. Hou, X.; Struble, L.J.; and Kirkpatrick, R.J., “Formation of ASR Gel and the Roles of C-S-H and Portlandite,” Cement and Concrete Research, V. 34, No. 9, Sept. 2004, pp. 1683-1696.
3. Hou, X.; Kirkpatrick, R.J.; Struble, L.J.; and Monteiro, P.J.M., “Structural Investigations of Alkali Silicate Gels,” Journal of the American Ceramic Society, V. 88, No. 4, Apr. 2005, pp. 943-949.
4. ASTM C33/C33M-18, “Standard Specification for Concrete Aggregates,” ASTM International, West Conshohocken, PA, 2018, 8 pp.
5. Cong, D.X.; Lawrence, B.L.; Deno, D.W.; and Patty, T.S., “ASR-Induced Surface Defects,” Proceedings of the 12th International Conference on Alkali-Aggregate Reaction in Concrete, Oct. 15-19, 2004, Beijing, China, V. 2, pp. 1142-1147.
6. Craig, P.; Pinelle, D.; Scalli, M.; and Sherman, M., “NSAR in Concrete Slabs,” Concrete Surfaces, Spring 2008, pp. 15-17. www.floorworks3.com/uploads/2/7/4/8/2748193/nsar-in-concrete-slabs.pdf.
7. Beyene, M.; Lee, R.J.; and Silsbee, M., “Cause of Debonding and Blistering of Epoxy Floor Coatings,” Concrete Construction, Sept. 2012. www.concreteconstruction.net/how-to/cause-of-debonding-andblistering-of-epoxy-floor-coatings_o.
8. ASTM C856-18a, “Standard Practice for Petrographic Examination of Hardened Concrete,” ASTM International, West Conshohocken, PA, 2018, 15 pp.
9. ASTM C457/C457M-16, “Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete,” ASTM International, West Conshohocken, PA, 2016, 18 pp.
10. ASTM C295/C295M-18a, “Standard Guide for Petrographic Examination of Aggregates for Concrete,” ASTM International, West Conshohocken, PA, 2018, 9 pp.