Average Rebar Weights
Welded Wire Mesh
Slab Flatness and F-numbers
Nominal MPa values of equivalent psi concrete strengths
In metric, concrete
strength is denominated in megapascals (MPa)
psi = 18 MPa (17.23 MPa exact)
Use 0.0068915 to convert psi to MPa
Newtons, psi, concrete strength and prestressed slabs
Concrete strengths are customarily denominated in psi (pounds per square inch) in the imperial system and in MPa's (megapascals) in metric. These are units of pressure.
The newton (N) is a measure of force. 1 newton is that force which pushes 1 gram of matter with an acceleration of 1 centimeter per second per second (or per second ²) or, equivalently, the force that accelerates 1 kilogram of matter to 1 meter per second ².
Force = mass x acceleration
Velocity is a measure
of constant speed (i.e., meters per second, miles per hour, furlongs per
1 N = 1 kg x (1 meter
/ second ²) -----> 1 N = 1
kg.meter / second ²
When you apply the force of 1 newton to a 1 meter ² area, you have pressure.
Pressure = force per area
Pressure can be measured in pascals (Pa). 1 Pa = 1 N / meter ²
The strength of concrete is commonly stated, in metric, in megapascals (MPa).
1 MPa = 1,000,000
Pa = 1,000,000 Newtons / meter ²