By ACI Committee 117

His specification offers normal tolerances for concrete development and fabrics. This record is meant for use via specification writers and ACI committees writing criteria because the reference record for setting up tolerances for concrete development and fabrics.

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2% Concealed surfaces ........................................... 2 Slopes, horizontal deviation Visible surfaces.................................................. 4% Concealed surfaces ........................................... ±1-1/4 in. 5, respectively. ±4 in. ±1 in. ±1/2 in. ±1/2 in. 4 Height (h) of lining..................... 3—Cross-sectional dimensions Thickness of lining cross section ......................................... ±1/2 in. 2, respectively. 2 Inside dimensions ......................................

1/4 in. Class C Surface................................................ +1/2 in. 3 Specifiers should anticipate local irregularities in formed surfaces. The purpose of establishing different classes of surface is to define the magnitude of irregularities in a manner that is consistent with the exposure of the concrete when in service. 3, the term “exposed concrete” is used as defined in ACI Concrete Terminology. 2. The Specifier should also anticipate abrupt transitions at the surface of members where segmental steel void forms are used to form floor framing members.

Horizontal deviation ............................................. ±1 in. Fig. 1—Cross-sectional dimensions. TOLERANCES FOR CONCRETE CONSTRUCTION 117-55 SECTION 8—MASS CONCRETE SPECIFICATION COMMENTARY The Specifier should review the ACI standards referenced in this document and designate which portions of the structure are mass concrete. ±1-1/4 in. ±2-1/2 in. 2, respectively. ±3/16 in. ±1-1/4 in. ±2-1/2 in. ±1/2 in. ±1 in. ±3/16 in. +1 in. –3/4 in. 1 Slopes, vertical deviation Visible surfaces..................................................

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