Page 41 - Masonry and Concrete

Concrete Construction Techniques
40 CHAPTER THREE

Typical Minimum
Minimum Maximum Cement
Compressive Coarse Content, Air Content
Weathering Strength, Aggregate sacks/ by Volume, Slump,
Element Probability* psi Size, in. cu. yd % in.
1
Foundations, Severe 2,500 5 ⁄2
basement
walls and
1
slabs not Moderate 2,500 1 5 ⁄2 3–5
exposed to
weather
(except
1
garage Mild 2,500 5 ⁄2
slabs)
Foundations, Severe 3,000 6† 5–7
basement
walls,
exterior
1
walls, and Moderate 3,000 1 5 ⁄2† 5–7 3–5
other
vertical
concrete
work
1
exposed to Mild 2,500 5 ⁄2
weather

Driveways, Severe 3,500 6† 5–7
garage
slabs,
walks,
1
porches, Moderate 3,000 1 5 ⁄2† 5–7 3–5
patios, and
stairs
exposed to
1
weather Mild 2,500 5 ⁄2
*See map for weathering probability (Alaska and Hawaii are classified as severe and negligible, respectively).
†Use air-entrained cement.
FIGURE 3-2
Recommended concrete mixes for various exposure conditions. (Minimum required strength from CABO One
and Two Family Dwelling Code.) Continued.

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