What is ACI tolerance?
As the title “Specifications for Tolerances for Concrete Construction and Materials (ACI 117)” implies, the toler- ances given are standard or usual tolerances that apply to various types and uses of concrete construction. They are based on normal needs and common construction tech- niques and practices.
What are concrete tolerances?
Traditionally allowable tolerances of concrete floor slabs were determined by checking the slab surface with a 10 foot straightedge. Common tolerances were 1/8 inch or 1/4 inch in 10 feet.
What are acceptable construction tolerances?
The Handbook of Construction Tolerance suggests +/- 1/4″ for light-frame construction and +/- 1/8″ for heavy timber construction. Echoing this, the UFGS suggests a 1/4″ tolerance limit for layout of walls and partitions, relative to intended location.
What is tolerance in concrete construction?
Tolerances, according to the commentary to ACI 117 are “a means to establish permissible variation in dimension and location, giving both the designer and the contractor limits within which the work is to be performed.” Tolerances provide a way for the structure’s designer to let the contractor know what is expected—to …
Is code for tolerance in construction?
The tolerance shall be 2995 – 2985 9 10 mm. The basic dimensions with tolerances shall be expressed as 2990 f 5 mm. and these five dimensional specifications shall correspond to same dimensions and same limits for the deviations.
Is code for PCC thickness?
The Thickness of PCC: The thickness of PCC is normally 50mm over Brick Flat Soling (BFS). If you don’t use BFS below PCC then the thickness should be 75¬mm. When the PCC is used in car parking area then the thickness should be 75mmover BFS.
What do FF and FL numbers mean?
Floor Flatness (FF): The FF number essentially tells you how flat your concrete floor is. Bumps and grooves cause your Floor Flatness numbers to drop. Higher F-numbers equal flatter floors. Floor Levelness (FL): The FL number indicates if you have any tilts or pitches in the slab.
Why is tolerance important in construction?
It can be difficult therefore to determine whether a variation from perfection is simply a function of the nature of a particular type of construction or material, or whether it constitutes a defect. For this reason it is important to specify allowable variations, or ‘tolerances’, that are not considered to be defects.
Is Code tolerance a measurement?
What is the maximum thickness of PCC?
What is PCC size?
The size of the aggregate used for PCC varies from 10-12 mm to 40 mm depending on where they are to be used. If the size of the aggregate is more, it results in the reduction of cement consumption.