Suggested Concrete Mix Ratios
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Suggested Mix Ratios
Suggested Concrete Mix Ratios
The strength of concrete varies with the amount of cement
and water in each yard. Trailered Ready-mix concrete is not
rated
by pounds per square inch (PSI) strength, but by the amount
of cement sacks in each yard. The following information represents
a rule of thumb for trailered ready-mix strengths and suggested
uses. Fence Posts
4-sack mix (four 94# bags of cement
per yard): This mixture has a PSI
of between 200011 and 250011 and is recommended
for things like setting fence posts.
Foot Traffic
5-sack mix (five 9411 bags): PSI of between 2500# and 3000#
and is recommended for things like walking surfaces such as
sidewalks.
Auto Traffic
6-sack mix (six 94# bags): PSI of between 300011 and 350011
and is recommended for things like driving surfaces such as
driveways.
Cold Climate Tip
In areas of multiple freeze/thaw cycles,
there should be 1 sack of cement added to each of these recommendations.
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