Aci 117 begins by defining what the tolerances mean in terms of such things as bowing deviation flatness and levelness and provides drawings to help explain these terms.
Floor flatness aci 117.
This specification provides standard tolerances for concrete construction and materials.
The fallacy of the straightedge method was the location of the measurement.
Common tolerances were 1 8 inch or 1 4 inch in 10 feet.
Depending on where the measurement was made the slab may pass or fail the specified.
Aci 117 sets minimum sampling requirements to help ensure a statistically representative set of measurements.
Adopted as a standard of the american concrete institute in november 1989.
They are calculated using the standards set forth in astm e1155 which is the standard test method for determining f f floor flatness and f l floor levelness numbers the american concrete institute indicates acceptable ranges for flatness and levelness in aci 302 1 guide.
A statement such as the following will serve to make aci specification 117 a part of the project specification.
117 3 section 1 general requirements p.
Rials shall conform to all requirements of aci 117 standard specifications for tolerances for con crete construction and materials published by the american concrete institute detroit michigan except as modified by the requirements of these contract documents.
Concrete floor slab flatness and levelness traditionally allowable tolerances of concrete floor slabs were determined by checking the slab surface with a 10 foot straightedge.
This document is intended.
Unless other wise specified flatness and levelness f numbers for floor installations exceeding 10 000 ft2 1000 m2 in total project area are to be measured in accordance with astm e 1155 and must meet the f number tol erances in aci 117.
F numbers provide architects and contractors a method of determining the flatness and levelness of a concrete floor slab.
Material tolerances are in section 2 including the location tolerance for reinforcing bars which varies depending on the thickness of the concrete member.
Astm e1155m standard test method for determining ff floor flatness and fl floor levelness numbers metric published by astm on april 1 2014 this test method covers a quantitative method of measuring floor surface profiles to obtain estimates of the floor s characteristic ff flatness and fl levelness face floor profile numbers f numbers.
Specification for tolerances for concrete construction and materials aci 117 10 and commentary an aci standard reported by aci committee 117 aci 117 10 specification synopsis.
Commentary is not a part of aci specification 117 10.
The 2010 revision of aci 117 greatly expanded the straightedge method for determining floor flatness note that levelness cannot be determined using a straightedge.
Work on project title shall conform to all requirements of aci 117 06 published by the american concrete institute farmington hills michigan except as modified by these contract documents p4.
Ascc concrete contractors concur.
