Page 41 - RoadCem Manual - PCT BV

• Chemical composition of the soil.
• Ground structure (upper 2 meters).
• Capillarity of the ground and setting behaviour.
• Soil Behaviour during the frost/thaw cycle.
3.2.3 Traffic load
The required traffic load information can be divided into two components:
• the heaviest axle load expected on the pavement (breaking strength!), and
• the maximum amount of standard repeating axle loads (fatigue!).
Information about the traffic load is generally specified by the client but when he does not know what the expected loads are then traffic surveys need to be conducted or engineering judgement and experience can be utilized to make an of the expected traffic intensity and axle loads.
In addition to the above the following data and information is also needed to make a good pavement design:
• Kind of construction that is being placed (asphalt, concrete, elements, other).
• Function of the future construction.
• Maximum load expected on the pavement.
• Maximum axle load on the pavement.
• Axle loads configuration(s) of the different vehicles.
• Amount of axle load repetitions per load.
• Desired lifespan of the pavement.
• Tire pressure of the vehicles.
How to determine maximum axle load and amount of axle load repetitions is discussed below.
Maximum axle load
The maximum axle load is the highest axle load that can be expected at any one time on the pavement. This can come from heavy transport or bad weight distribution of a truck whereby the full load is placed on one wheel. When dimensioning the pavement there is need to determine that the breaking strength of material used in pavement structure is not exceeded.
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