# RE: Low Concrete Quality

• To: seaint(--nospam--at)seaint.org
• Subject: RE: Low Concrete Quality
• From: "syed faiz ahmad" <syedfaiz23(--nospam--at)hotmail.com>
• Date: Fri, 15 Jun 2001 21:26:55 +0300
```Gentlemen

```
This is addressed to LUTZ in particular. I am surprised to learn you have never heard Kg/cm2 as an unit for compressive strength. Well, this is an internationally accepted unit for strength or stress. This is how it is expressed in METRIC unit or MKS (Meter, Kilogram, Second) unit, as it is expressed in PSI in FPS (Foot, Pound, Second) unit.
```And, for SI (systeme Internationale) unit, the same unit is expressed as
N/mm2 ( and not N/cm2); its also known as MPA or Mega Pascal.
And, 1 MPA (N/mm2) = 145 PSI. Hope this explains.
```
As for the original question, Iam a little busy right now & shall respond in detail later. Regards,
```
SYED FAIZ AHMAD, MENGG, Mem ASCE
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD

```
```From: "Lutz, James" <JLUTZ(--nospam--at)earthtech.com>
To: seaint(--nospam--at)seaint.org
Subject: RE: Low Concrete Quality
Date: Fri, 15 Jun 2001 10:47:15 -0700

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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