Page 144 - RoadCem Manual - PCT BV

Figure 5.33 Commpresive strength test.
At least 2 cubes must be made to determine the compressive strength.
• When the value for compressive strength is higher than specified then the use of less cement can be considered but will need to be verified by subsequent tests. This can result in a substantial saving.
• When the value for compressive strength is lower than specified then more cement needs to be used.
5.7.3 Dynamic elasticity modulus
The modulus of elasticity is the slope of the initial, linear-elastic part of the stress-strain diagram.
where
E = Young's modulus [Nm-2]
F = applied load [N]
A = cross-sectional area [m2] x = extension [m]
L = original length [m]
For isotropic materials it is related to the bulk modulus K and to the shear modulus G by
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