Civil Engineering Reference
In-Depth Information
10.5
MULTICOURSE FLOORS AND ROOFS
Symbols:
Carb = carbonate aggregate concrete
Sil = siliceous aggregate concrete
SLW = sand-lightweight concrete
10.5.1 Two-Course Concrete Floors
Figure 10-2 gives information on the fire resistance ratings of floors that consist of a base slab of concrete with
a topping (overlay) of a different type of concrete.
5
5
4
4
4 hr.
4 hr.
3
3
3
3
2
2
2
2
1
1
1
1
0 1 2 3 4 5
0 1 2 3 4 5
Carb base
Thickness of normal weight concrete base slab, in.
Sil base
5
5
4
4
4 hr.
4 hr.
3
3
3
3
2
2
2
2
1
1
1
1
0 1 2 3 4 5
0 1 2 3 4 5
Thickness of sand-lightweight concrete base slab, in.
Figure 10-2 Fire Resistance Ratings for Two-Course Floor Slabs
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