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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 36 Abstracts search results
Document:
CI4606Q&A
Date:
June 3, 2024
Publication:
Concrete International
Volume:
46
Issue:
6
Abstract:
This month's Q&A focuses on requirements for checking flatness of suspended slabs. It discusses the time limit for measuring floor flatness after finishing, compliance requirements for the manual straightedge method, minimum number of samples, and sample distribution, as well as possible remedies for noncompliance.
CI4509Q&A
September 1, 2023
Author(s):
Bruce A. Suprenant and Jim Klinger
45
9
This month’s Q&A focuses on training requirements for operators of devices used for floor flatness/levelness testing. It discusses whether “legacy training” is enough, or examination and certification are required. It also reviews ACI documents for provisions and recommendations regarding this topic.
CI4207Q&A
July 1, 2020
42
7
We are thinking of using 24 x 24 in. (610 mm) large format tiles for an upcoming project. What are the challenges specific to the use of large format tiles and what is the most economical method for specifying floor flatness in this case?
SP-338_03
March 1, 2020
Eldon Tipping and Rick Smith
Symposium Papers
338
Two characteristics are of primary interest to those using floor surfaces – the surface bumpiness (flatness) and the levelness. Prior to publication of the 2006 cycle of the ACI 117 document, the ACI 117 committee completed an exhaustive study of the floor surface characteristics evaluated by the F-Number System, The 10-Foot (3 m) Straightedge approach, and the Waviness Index System. The purpose of the study was to evaluate each of the methods and to develop tables that establish a small degree of uniformity among the various tolerance approaches. The F-Number System and Waviness Index use data taken at regular intervals along lines located in random locations on the test surface. The 10-Foot (3 m) Straightedge approach uses a straightedge placed in any location on the floor surface. The largest gap between support points is then measured. Each of the methods utilizes different criteria to evaluate data, so it is important for the specifier to understand the specific surface characteristics controlled by each of the methods. The ACI 117 committee evaluated a set of 600 floor surface profiles. Each of the profiles was 100 feet in length. Six groups of F-number pairings were developed as follows: FF 20/FL 15; FF 25/FL 20; FF 35/FL 25; FF 45/FL 35; FF 60/FL 40; FF 100/FL 60; each of the groups contained 100 profiles. Both the Flatness F-number and Levelness F-number for each of the profiles in each group were within 5% of the respective target values. For each of the 600 profiles, the gap-below-the-straightedge and waviness index statistics were calculated. Results from the study are presented.
DOI:
10.14359/51724724
CI4202Paul
February 1, 2020
William Paul, James Klinger, and Bruce A. Suprenant
2
This is a second article in a series discussing a study to evaluate laser scanning for concrete quality assurance applications. It focuses on the use of laser scanning technology to evaluate floor flatness and levelness. F-numbers obtained using a Type II device and laser imaging devices were compared and evaluated for their repeatability and reproducibility.
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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
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