By ACI Committee 117
His specification presents normal tolerances for concrete development and fabrics. This rfile is meant for use by way of specification writers and ACI committees writing criteria because the reference rfile for developing tolerances for concrete building and fabrics.
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Extra info for ACI 117-10: Specification for Tolerances for Concrete Construction and Materials and Commentary
Above the specified thickness shall be assumed to have a thickness 3/4 in. more than the specified thickness. 6 When corrective action is required, additional samples shall be taken in the vicinity of unacceptable results to establish the extent of corrective action. –1/2 in. +1 in. 1 Stairs, measured along a line parallel to the stair axis Difference between largest and smallest tread or riser in any flight shall not exceed 3/8 in. Difference in height of adjacent risers measured at the nose shall not exceed 3/16 in.
3/4 in. Slabs on structural steel or precast concrete ............................................................ ±3/4 in. ±1/2 in. 3 The term “exposed concrete” is used as defined in ACI Concrete Terminology. 2. ±3/4 in. ±3/4 in. 5 The elevation of the soil upon which a slab-onground is to be placed is generally more difficult to control than that of the concrete surface. The intent of establishing an elevation tolerance of ±3/4 in. 4. If more stringent tolerance requirements are deemed necessary by the Specifier, consider a fine grade elevation tolerance of ±1/2 in.
The F-Number System TOLERANCES FOR CONCRETE CONSTRUCTION SPECIFICATION 117-39 COMMENTARY uses only 2 ft slope changes (center offset from a 2 ft chord). The manual straightedge and computerized simulation of the manual straightedge methods both use maximum offsets from chords of varying lengths up to 10 ft. To develop an understanding of the relationship among these approaches, the committee undertook a study of six groups of 100 individual profiles each (600 total). The profiles included all quality levels likely to be produced using current construction techniques; each of the profiles was 100 ft long.