What they are suggesting is higher strength concrete 25Mpa which is about 3600
psi. The air is air entrainment. 5% is the value you should look for. This will
improve the conrete's durability especially freeze-thaw durability. I know you
VE3's live in the temperate zone but every little bit helps. Mpa is the
abbreviation for Mega-Pascals the metric measure of pressure or in this case
force per unit area.
Lonberg Design Group, Ltd.
H. Lonberg, P.E., S.E., PEng.
-------------- Original message --------------
From: "J.G.Castellano" <firstname.lastname@example.org>
> I am installing a Trylon tower and the foundation drawing calls for 3,000PSI
> concrete (20MPa), when I explained what I was doing one of the concrete
> companies recommended 25Mpa with air. Can someone please explain what is the
> Julio VE3FH
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