Page 145 - RoadCem Manual - PCT BV

where
ν = Poisson's ratio
K = bulk modulus [Nm-2]
G = shear modulus [Nm-2]
Commonly ν = 1/3, and hence E = K, and E = (8/3)G.
The measurement of the Dynamic Modulus of Elasticity can be achieved by three or four point bending flexural tests (Figure 5.34).
The minimum value should be at least of 3.000 MPa after 48 hours. This is a higher value in comparison to all traditional materials with the exception of concrete (20.000 MPa) and asphalt (7.500 MPa).
At least 3 test samples must be made to determine the dynamic elasticity moduls.
• When a value higher than 3.000 MPa is less cement can be used but verification test is required. This can result in a substantial saving.
• When a value of less than 3.000 MPa is achieved then more cement and/or RoadCem must be used but verification test is required.
5.7.4 Breaking strain
The measurement of the Breaking Strain is also achieved by three or four point bending flexural tests (Figure 5.34).
The minimum acceptable value when the 3-point flexural test is used is 500 􏰀m/m after 28 days. This is a higher value in comparison to all traditional material.
3 test samples must be made to determine the breaking strain. The test can be carried out simultaneously with determination of the dynamic elasticity module.
Figure 5.34 Three-point bending flexural test.
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