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Re: Lean concrete

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In a message dated 9/18/98 6:06:20 AM Pacific Daylight Time, sds(--nospam--at)sdsarch.com
writes:

<< 
 I have used the following mix on many occasions for fill:
 
 1 1/2" rock		 800 pounds
    3/4" rock		1000 pounds
 sand			1500 pounds
 cement			  141 pounds
 water			    30 gallons
  >>
Roger,
This looks like a receipe for a Swiss watch (made of concrete, of course [ 8^)
). 
We use a much simpler specification: 
	"5 sack mix" is 5 sacks of concrete per cy and gives a 3000 psi concrete
	"4 sack mix" gives 2000 psi concrete
and a "slurry" for a flowable backfill stronger and more compact than any soil
and yet can be dug up with soil digging tools is spec'd as a "2 sack mix".
These are obviously good ol' boy rules of thumb not meant for critical
applications, but they have worked for  a long time, and all the ready mix
suppliers (who all seem to be good ol' boys) will certainly know what you are
talking about.
Cheers,
Charles Laines, S.E.
Long Beach, Ca