Page 27 - Masonry and Concrete

Understanding Concrete
26 CHAPTER TWO

Typical Minimum
Minimum Maximum Cement
Compressive Coarse Content, Air Content
Weathering Strength, Aggregate sacks/ by Volume,
Element Probability* psi Size, in. cu. yd % Slump, 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 slabs) Mild 2,500 5 ⁄2
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 exposed
1
to weather Mild 2,500 5 ⁄2
Driveways, Severe 3,500 6† 5–7
garage slabs,
1
walks, Moderate 3,000 1 5 ⁄2† 5–7 3–5
porches, patios,
and stairs
exposed
1
to 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 2-12
Recommended concrete mixes for various exposure conditions. (Minimum required strength based on
requirements of CABO One and Two Family Dwelling Code.) Continued.

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