UFC 3-300-10N
25 May 2005
2-3.2.7 Concrete wall and column footings must have a minimum thickness of
305mm (12 inches), and a minimum width of 457mm (18 inches).
2-3.2.8 Concrete for floors: The following criteria must apply unless structural or
durability requirement necessitate higher strengths. Slump may be increased to 203mm
(8 inches) when a high-range water-reducing admixture is used:
Usual Class Traffic
Typical Uses
28 day strength
Max. Slump
MPa
psi
mm
in
1. Light foot
Residential or tile covered
20
3000
100
4
2. Foot
Offices, churches, schools,
24
3500
100
4
hospitals, residences
3. Light foot &
Drives, garage floors and
25
3500
100
4
pneumatic wheels
sidewalks for residence
4. Foot and
Light industrial, commercial
30
4000
75
3
pneumatic wheels
5. Foot and
Single-course industrial,
35
4500
75
3
wheels, abrasive
integral topping
wear
6. Foot and steel-
Two-course, heavy
See ACI 301
tire vehicles,
industrial topping
severe abrasion
2-3.2.9 The following maximum water-cement (W/C) guidelines must apply to all
structural concrete:
Concrete Not Exposed to Severe Conditions:
Compressive Strength (28 days)
Without AE
With AE
20.7 Mpa (3000 psi)
0.58
0.50
24.1 Mpa (3500 psi)
0.54
0.48
27.6 Mpa (4000 psi)
0.50
0.45
AE = Air-entrainment
Concrete for Special Exposure Conditions:
Exposure Condition
Maximum W/C
(Normal Weight Aggregate)
Concrete intended to be watertight:
(a) exposed to fresh water
0.50
(b) exposed to brackish water or
seawater
0.45
Concrete exposed to freezing and thawing
In moist conditions:
(a) Curbs, gutters, guardrails, or thin sections
0.45
(b) Other elements
0.50
(c) In presence of deicing chemicals
0.45
For corrosion protection for reinforced concrete
exposed to deicing salts, brackish water, seawater,
or spray from these sources:
2-5
Previous Page
