Tolerable Crack Widths for Reinforced Concrete |
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|
MPa |
|
MPa |
|
MPa |
|
mm |
|
||||||||||
Mass concrete not exposed to atmospheric conditions or other deteriorating agents |
15 |
where mass rather than strength is the principal considerations. |
15 |
Walls or floors subjected to severe exposure ( includes extreme heat or cold and or other aggressive chemicals.) |
25 |
Dry air or protective membrane |
0.40 |
|
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Drainage and utility structures |
25 |
Concrete fills. Mpa (2000 psi) |
15 |
Columns in multistory buildings carrying heavy loads |
30 |
Humidity, moist air, soil |
0.30 |
|
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Structures to contain noncorrosive fluids (tanks and reservoirs) |
25 to 30 |
Encasements for utility lines and ducts |
20 |
Concrete deposited under water (tremie concrete) |
25 |
Deicing chemicals |
0.20 |
|
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Waterfront structures on fresh water. |
30 |
Foundation walls, footings and cast-in-place concrete piles |
25 |
Reinforced concrete in contact with sea-water, alkaline soils or waters, or other destructive agents |
30 |
Sea water and saltwater spray
|
0.15 |
|
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Reinforced concrete structures over sea water which are sufficiently elevated so that they are not ordinarily wet by salt water |
30 |
Slabs on grade
|
25 |
Prestressed concrete construction. |
35 |
Water retaining structures |
0.10 |
|
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Mass concrete exposed to seawater from 3 feet below low water to 3 feet above high water or normal wave action |
30 |
Reinforced concrete buildings |
25 |
Tolerable Crack Widths Exposure Condition (mm)
|
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Reinforced concrete decks of waterfront structures where the underside is frequently wet by salt water |
30 to 40 |
Precast members (including architectural and structural members and piles) |
30 |
|
|
Moderate |
Severe |
Aggregate Size |
Nominal Maximum |
|||||||||
|
|
|
|
10 |
12 |
19 |
38 |
75 |
150 |
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Minimum Concrete Strength (fc: Newtons) |
||||||||||||||||||
bolt diameter mm |
minimum embed mm |
edge distance mm |
spacing mm |
20 MPa tension |
20 MPa shear |
25 MPa tension |
25 MPa shear |
30 MPa tension |
30 MPa shear |
|||||||||
6.4 |
63.5 |
38.1 |
76.2 |
890 |
2225 |
890 |
2125 |
890 |
2225 |
|||||||||
9.5 |
76.2 |
57.2 |
114.3 |
2225 |
4890 |
2225 |
4890 |
2225 |
4890 |
|||||||||
12.7 |
101.6 |
76.2 |
152.4 |
4225 |
5560 |
4225 |
5560 |
4225 |
5560 |
|||||||||
12.7 |
101.6 |
127 |
152;4 |
6450 |
7120 |
6670 |
7340 |
6890 |
7785 |
|||||||||
15.9 |
114.3 |
95.3 |
190.5 |
6670 |
12230 |
6670 |
12270 |
6670 |
12270 |
|||||||||
15.9 |
114.3 |
158.8 |
190.5 |
9460 |
13120 |
9785 |
13340 |
10670 |
13570 |
|||||||||
19.1 |
127.0 |
114.3 |
228.6 |
10000 |
14460 |
10000 |
15835 |
10000 |
15835 |
|||||||||
19.1 |
127.0 |
190.5 |
228.6 |
12565 |
19015 |
13120 |
19130 |
14230 |
19570 |
|||||||||
22.2 |
152.4 |
133.4 |
266.6 |
11300 |
16460 |
11300 |
18015 |
11300 |
18015 |
|||||||||
25.4 |
177.8 |
152.4 |
304.8 |
13570 |
18350 |
14460 |
20020 |
16235 |
23575 |
|||||||||
28.6 |
203.2 |
171.5 |
342.9 |
15120 |
21130 |
15120 |
21130 |
15120 |
21130 |
|||||||||
31.8 |
228.6 |
190.5 |
381.0 |
17790 |
25800 |
17790 |
25800 |
17790 |
25800 |
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