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Utveckling av nedbrytningsmodeller: sprickinitiering och sprickpropagering
Swedish National Road and Transport Research Institute.
2001 (Swedish)Report (Other (popular science, discussion, etc.))
Abstract [sv]

The objective of this study was to develop models for predicting the


applications to the initiation of cracking for flexible pavements and to

develop models for

predicting crack propagation in flexible pavements. Crack initiation was

defined as the first

appearance of cracking in the wheel paths. The models are aimed for use in

Pavement Management

Systems. Data used in the study consisted of data from a Swedish LTPP study

where over 600 test

sections have been monitored during more than ten years. Every year a

detailed distress survey,

measurements of rut depth and the longitudinal profile have been carried out

at each test section.

The database contains information about traffic, climate, pavement structure,

surface condition and

structural strength. Pavement response based explanatory factors included,

among other things,

tensile strain at the bottom of the asphalt layer and other deflection based

factors (i.e. surface

curvature index, curvature basin factor, bearing capacity).

The modelling of crack initiation models was carried out using a survival

analysis approach.

The modelling of crack propagation models was carried out using linear

regression analysis. From

the data, describing the yearly development of cracks, a Cracking Index was

calculated. The same

approach of developing crack models was used in the PARIS (Performance

analysis of road

infrastructure) project carried out within the 4th European Framework

Programme Road Transport


Models were successfully developed to predict the cumulative number of

traffic loading to the

initiation of cracking in the wheel paths. The models included two

independent variables to

pavement response and ageing (a relationship between a response variable and

the annual

cumulative number of traffic loading). As response variables Surface

Curvature Index 300 or

Tensile Strain at the bottom of the asphalt layer can be used in the crack

initiation models.

Models were also developed to predict crack propagation in the wheel paths.

For any given

section of road, the slope of the linear model can be estimated from the

level of distress at the last

distress survey and the age of the pavement surface or the number of ESALs

carried by the

pavement at that time.

All models have been validated against independent data, not used in the

development phase.

The results of the validation process show that the models meet the

requirements for models to be

used in Pavement Management Systems.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut., VTI meddelande 916 , 2001.
VTI meddelande, ISSN 0347-6049
Keyword [en]
Swedish, Sweden, Flexible pavement, Fatigue, Cracking, Rutting, Development, Forecast, Mathematical model, Input data
Research subject
Road: Highway design, Road: Surfacing; Road: Highway design, Road: Pavement design
URN: urn:nbn:se:vti:diva-4860OAI: diva2:673689
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03

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Wågberg, Lars-Göran
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