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# Mpa in concrete design.

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 LazerLorne (Civil/Environmental) 11 May 12 12:07
 I know that Mpa is the metric SI equivalent of PSI. I know that the “M” stands for mega, meaning one million. I know the “pa” stands for “pascal”, which is one Newton of pressure/m². What I want to know is what this translates into in actual pressure. For example, in designing concrete, what pressure will 28 Mpa concrete stand up to? How is it calculated?
 Ron (Structural) 11 May 12 13:40
 Are you asking about this in the context of concrete mix designs or in the context of structural design?28 MPa concrete will withstand at least 28 MPa in compression.....or slightly more than 4000 psi. It is calculated as force per unit area.Please don't design anything.
 LazerLorne (Civil/Environmental) 11 May 12 13:50
 I am not designing the concrete mix. I just want to know the math behind the calculation in metric. I know that a Newton is about 102 grams pressure at sea level and that one Pascal is equal to one Newton spread over a square meter. But how does this translate into a compression test for concrete in Mpa? What is the math behind this?
 hokie66 (Structural) 11 May 12 17:50
 First, respect Mr Pascal by writing it as MPa. MPa is N/mm^2. One MPa is 1000 kPa.
 BigH (Geotechnical) 13 May 12 19:48
 Perhaps he is asking:Take the load at failure (kN), divide by the area of the cylinder or cube (perpendicular to the loaded axis) which is in mm2. Determine the pressure kN/mm2 by Load/Area. Change kN to N and you have MPa.
 sdz (Structural) 14 May 12 2:30
 Would it help if I tell you that 28MPa is approximately 2800 tons/m^2 ?

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