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Mixing 4000 PSI Concrete | DoItYourself.com 師傅...我還是學九陽神功就好了(⊙_⊙;)A 4,000 PSI concrete (or pounds per square inch) is the general type of concrete that is the standard for making driveways, walkways and stairs. ... Step Three Determine is extra material will be needed to mix the PSI concrete. Sometimes you can just add ...
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