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The metric S.I. system is used throughout. The basic unit of
stress, and hence, modulus of elasticity and stiffness, is the
Pascal (Pa) which is 1 N/m2. Multiples of this are
used for convenience viz.: 1 MPa = 1 x 106 N/m2,
1 GPa = 1 x 109 N/m2. All strains are
quoted in micro-strain, 1 micro-strain = 1 x 10-6
µm/m. In all cases, logarithmic terms are to base 10. |
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| Conversion of H/FWD deflection basins |
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Most Falling Weight devices have a load pulse duration of
about 25 ms. However, the KUAB falling weight deflectometers use
a pulse duration of approx. 60 milliseconds. A conversion equation is provided to convert KUAB deflections to a pulse duration of to 25 ms. |
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| Back-calculation of a deflection
profile |
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In pavement evaluation surveys, the structural condition is
deduced from Falling Weight Deflection response. The recorded
deflections are converted into a pavement model to assess the
dynamic pavement performance. |
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The structural thickness design of a flexible pavement is based
on a calculating strains and stresses at critical points in the
pavement structure. Pavers® allows a pavement engineer to define
or use calibrated performance models and failure criteria for
all pavement layers and subgrade in his pavement design projects.
By adjusting pavement layer thicknesses until the allowable
number of passes matches the forecasted number, a structural
pavement design is made. |
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| Assignment of PCN to an airport pavement |
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Pavers® enables the determination of a technical load carrying capacity expressed in terms of LCN or PCN of an airport pavement. The PCN index can be based on a number of departures of a single aircraft or on a mix of traffic. The worked examples explain the PCN-method presented in CROW’s Guideline on PCN Assignment. |
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| Design of a container terminal
pavement |
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Once the traffic on the terminal is assessed, the thickness
of a cemented base for a container terminal pavement with
concrete blocks can be determined quite easily.
Since the flexible and rigid models in Pavers have the same User
Interface, a jointed rigid concrete pavement can be designed
quite easily with the slab-on-grade model using the same traffic
data as in the flexible design. This is one of the many features
of
Pavers®, and is unique in the design software for intermodal
container terminal pavement. |
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| Design of an airport pavement |
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Airport Pavement Design has never been so easy! The Pavers ®
design module for rigid or flexible aircraft pavement thickness
determination requires a designer to enter a number of input
parameters and then returns a pavement thickness.
A summary list of the steps to follow in a thickness assessment
of flexible pavement is explained in a worked example. |
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