Title:
Concrete Q&A: A Hard Look at “Hard Troweling” of Air-Entrained Concrete
Author(s):
Publication:
Concrete International
Volume:
45
Issue:
7
Appears on pages(s):
71-72
Keywords:
finish, trowel, delamination, blister
DOI:
10.14359/51738881
Date:
7/1/2023
Abstract:
This month’s Q&A focuses on the issue of delaminations caused by troweling of concrete. It discusses a “hard troweled” expression used by the industry, as well as the influence of concrete’s air content and using various power finishing equipment on blister formation and concrete delaminations.
Related References:
1. ACI Committee 302, “Guide to Concrete Floor and Slab Construction (ACI 302.1R-15),” American Concrete Institute, Farmington Hills, MI, 2015, 76 pp.
2. ACI Committee E703, “Concrete Craftsman Series: Slab-on-Ground (CCS-1(10)),” third edition, American Concrete Institute, Farmington Hills, MI, 2010, 68 pp.
3. ACI Committee 212, “Report on Chemical Admixtures for Concrete (ACI 212.3R-16),” American Concrete Institute, Farmington Hills, MI, 2016, 76 pp.
4. ACI Committee 306, “Guide to Cold Weather Concreting (ACI 306R-16),” American Concrete Institute, Farmington Hills, MI, 2016, 24 pp.
5. ACI Committee 301, “Specifications for Concrete Construction (ACI 301-20),” American Concrete Institute, Farmington Hills, MI, 2020, 69 pp.
6. AIA MasterSpec, “Section 03300 – Cast-in-Place Concrete,” The American Institute of Architects, Washington, DC.
7. “CIP 20 - Delamination of Troweled Concrete Surfaces,” National Ready Mixed Concrete Association, Alexandria, VA, 2018, 2 pp.
8. Tarr, S.M., and Farny, J.A., “Concrete Floors on Ground,” EB075, fourth edition, Portland Cement Association, Skokie, IL, 2008, 252 pp.
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11. ASCC Position Statement #1: “Hard Trowel Finish on Air-Entrained Concrete,” American Society of Concrete Contractors, St. Louis, MO, 2011, 1 pp.
12. “The Constructor’s Guide to Quality Concrete Construction,” third edition, American Society of Concrete Contractors, St. Louis, MO, 2014, 147 pp.
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15. Suprenant, B.A., and Malisch, W.R., “Beware of Troweling Air-Entrained Concrete Floors,” Concrete Construction, Feb. 1999, 2 pp.
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18. Tarr, S.M.; Kozikowski, R.L.; and Sheehan, M.J., “Guide to the Design and Construction of Concrete Toppings for Buildings,” American Society of Concrete Contractors, St. Louis, MO, 2022, 94 pp.
19. Kozikowski, R., “Concrete Q&A: Density of Lightweight Concrete,” Concrete International, V. 34, No. 8, Aug. 2012, pp. 74-76.