Title:
Concrete Q&A: F-numbers and Accuracy of Measurement Devices
Author(s):
Publication:
Concrete International
Volume:
47
Issue:
11
Appears on pages(s):
111-112
Keywords:
DOI:
10.14359/51749287
Date:
11/1/2025
Abstract:
This month’s Q&A focuses on measuring F-numbers for slabs to receive a troweled finish in accordance with ASTM E1155-20, “Standard Test Method for Determining FF Floor Flatness and FL Floor Levelness Numbers.” Specifically, on Note 3 of the standard recommending that all project participants agree on the exact test apparatus to be used for contract specification enforcement.
Related References:
1. ASTM E1155-20, “Standard Test Method for Determining FF Floor Flatness and FL Floor Levelness Numbers,” ASTM International, West Conshohocken, PA, 2020, 8 pp.
2. Paul, W.; Klinger, J.; and Suprenant, B.A., “ASCC 3-D Laser Scanning Study,” Concrete International, V. 42, No. 2, Feb. 2020, pp. 30-36.
3. Zhang, L.; Hernandez, M.; Dare, J.; Kowalski, M.; and Che, E., “Interlaboratory Study on Precision Statement of Using a Terrestrial Laser Scanner to Verify Concrete Tolerance,” Concrete International, V. 47, No. 1, Jan. 2001, pp. 37-47.
4. ACI Committee 117, “Specification for Tolerances for Concrete Construction and Materials (ACI 117-10) and Commentary (Reapproved 2015),” American Concrete Institute, Farmington Hills, MI, 2010, 76 pp.