Page 43 - RoadCem Manual - PCT BV
P. 43

 Figure 3.9 High axle load examples.
Maximum standard repeating axle load
For the dimensioning of pavements in most countries the maximum standard axle load is set at 100 kN per axle and in some countries this is 80kN. It is expected that the standard axle load shall increase in the future as there are more heavy vehicles on the road.
For the tire pressure there is a maximum of 1.000 kPa. When the tire pressure increases then the weight shall be distributed over a smaller surface and this leads to a higher pressure and strain on the pavement.
The damage to the pavement is created mainly by the high load. Cars compared to trucks hardly contribute to the damage. With viscous-elastic materials such as is the case when RoadCem is used the damage from cars is 4 orders of magnitude smaller than it is for trucks.
As an example, the comparison below explains what the damage effect is from a truck and a car. Input data: Axle load car is 10kN
Axle load heavy loaded truck is 100 kN The formula we use to determine the damage factor is
 Axle Load 4 Damage factor, Ni =  100 
Therefore the result for the two different kinds of vehicles is:
  10 4 Personal Car , Ni =   100)
= 0,0001
 100 4 Heavey Loaded Truck , Ni =   100)
= 1
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