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B. Hofko, R. Blab:
"Performance Based Lab Tests to Predict Pavement Fatigue";
Vortrag: Fifth International Conference on Construction in the 21st Century, Istanbul, Türkei; 20.05.2009 - 22.05.2009; in: "Proceedings of the Fifth International Conference on Construction in the 21st Century", (2009), Paper-Nr. 171, 8 S.

As roads are subjected to high traffic
loads due to the strong growth in heavy vehicle
traffic and new trends in the automotive and tyre
industries, the traditional asphalt mix tests are often
inadequate for a reliable prediction of the in-service
performance of flexible road pavements. With the
new generation of performance-based test methods
(PBT) the complex thermo-rheological properties of
bituminous bound materials such as asphalt concrete
(AC) can be obtained. On the basis of PBT
performance indicators like low-temperature
cracking, high-temperature rutting and fatigue at
intermediate temperatures are assessed. This paper
presents the principle of the so-called 4-point-
bending-beam (4-PBB) fatigue test as one PBT to
predict pavement fatigue. Furthermore it is shown,
how results from this test can be used in
combination with computer-based simulations to
quantify the effects of different tyre types and wheel
configurations on pavement fatigue. In an ongoing
research programme extensive 4-PBB-tests are
carried out on different AC mixes for base layers at
various temperatures and frequencies to obtain
Woehler-curves. At the same time, computer-based
linear elastic simulations are performed. These
simulations are carried out on two different
constructions, different tyre types (standard and
wide base) and wheel configurations (tyre load and
pressure). The strains on the bottom of the
bituminous bound layers are taken from the
simulations and used in combination with the
Woehler-curves to evaluate the life-time in
permissible load cycles for different tyre
configurations.

Performance-based test methods, Pavement fatigue, Numerical simulation, Wheel configuration

http://publik.tuwien.ac.at/files/PubDat_179965.pdf