# Re: Low Concrete Quality

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Low Concrete Quality
• From: "M Hariharan/engg" <hariharan.m(--nospam--at)eil.co.in>
• Date: Sat, 30 Jun 2001 15:42:51 +0530
```I am yet to see the later posts, and do not know yet if someone has already
answered. The answer to this question, from one who has used this unit for long,
is, - Kg here actually refers to Kg force, which is the force exerted by gravity
on a mass of 1Kg, and is equal to 9.81 Newtons. The more fastidious people write
Kgf.

210 N/cm^2 is 2.1 N/mm^2 or 2.1 MPa.
210 Kgf/cm^2 is close to 21 MPa

Hariharan

Lutz, James wrote:

> I think my unstated point was that the units made no sense. Compressive
> strength is measured in units of pressure, or force per unit area, not mass
> per unit area. A kilogram is a unit of mass. A Newton is a unit of force
> equal to a kilogram times an acceleration of 1 meter/sec2.
>
> As we used to say in Alaska, "I don't care how they do it down south."
>
> -----Original Message-----
> From: Oshin Tosounian [mailto:sdgse(--nospam--at)pacbell.net]
> Sent: Friday, June 15, 2001 10:35 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Low Concrete Quality
>
> ----- Original Message -----
> From: "Lutz, James" <JLUTZ(--nospam--at)earthtech.com>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Friday, June 15, 2001 8:41 AM
> Subject: RE: Low Concrete Quality
>
> > I've never heard of compressive strength being expressed as kg/cm2.
> > Shouldn't it be N/cm2 or MPa? 210 N/cm2 or 21 Mpa is around 3000 psi. (1
> Ksi
> > = 6.894 MPa.)
> >
>
> Kg/cm2 is part of the metric system used in some countries. The others you
> metioned are part of  "System International", which is erroneously (I think)
> referrd to as the metric system.
>
> Oshin Tosounian, S.E.
> Los Angeles, CA
>

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