Page 148 - RoadCem Manual - PCT BV

5.8 Procedure for checking that minimum requirements are met
The RoadCem Design Approach presented earlier requires that a check if the minimum design requirements are met is carried out. If the minimum design requirements mentioned in paragraph 5.2 to 5.7 are not met then the following pavement and foundation damage scenario(s) can occur:
• Deformation in the sub-base (1);
• Deformation in un bound foundation (2);
• Cracking on top of bound foundation (3);
• Instantaneous break in bound foundation (4);
• Fatigue damage in bound foundation (4).
Unbounded material Bounded material Figure 5.36 Damage scenario that can occur in road construction
A part of the pavement structure design is the determination of stresses and strains within the structure itself under given design loads. In response to the loading the pavement structure will deform. Deformation can occur at the top of the layer and cracks will occur underneath the bound material. The stresses and strains that occur depend on the traffic load, the elasticity modulus of the materioals and the viscosity of the materials and the properties of the soil.
The stresses and strains are typically calculated using the multiple layer elasticity theory. Once tehse calculations are performed a comparison is made to the proporties of the materials used and an evaluation of the ability of the materials to withstand, without damage, the stressess and strains calculated is carried out. This kind of calculations are typically performed by specialised engineering offices, such as ARCADIS, using specialised calculation methods and software.
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