The american concrete institute.
Expansion joints concrete slabs aci.
Concrete undergoes expansion due to high temperature when in a confined boundary which leads to cracks.
Then changed to 24 to 36 times slab thickness.
Table 1 2 expansion joint spacings.
Aci 224r 92 one to three times the height of the wall in solid walls.
Joint spacing in meters.
Aci 350r joint spacing varies with amount and grade of shrink age and temperature reinforcement.
This article emphases on need of expansion.
The rigidity of concrete enables it to distribute loads over.
Joint spacing that is greater than 15 feet require the use of load transfer devices dowels or diamond plates.
Refer to aci 223 for procedures for the design and construction of shrinkage compensating concrete slabs on ground.
By properly selecting the characteristics of the concrete slab.
Aci 350r 83 30 ft 9 m in sanitary structures.
Expansion joints are placed in concrete to prevent expansive cracks formed due to temperature change.
The american concrete institute disclaims any and all re.
Joint spacing in feet contraction joints may be tooled into the concrete surface at the time of placement.
Founded in 1904 and headquartered in farmington hills michigan usa the american concrete institute is a leading authority and resource worldwide for the development dissemination and adoption of its consensus based standards technical resources educational programs and proven expertise for individuals and organizations involved in concrete design.
4 4 isolation joints and expansion joints 4 4 1 isolation joints 4 4 2 expansion joints.
Author spacing lewerenz 1907 75 ft 23 m for walls.
Concrete floor and slab construction 302 1r 3 the design of slabs on ground should conform to the recommendations of aci 360r.
Hello aci 224 3r 95 recommend table 1 2 as a rule of thumb and national academy of science criteria fig 3 6 as analytical way to determine maximum expansion aci expansion joint spacing aci concrete code issues eng tips.
The depth of your concrete joints should be 25 of the depth of your slab.
Joints are commonly spaced at distances equal to 24 to 30 times the slab thickness.
Always cut off of your corners as soon as possible because this is usually the first place cracking starts.
