Jun HATAYAMA
Study on cracking resistance and improvement of bituminous stabilization base course material
Osamu TAKAHASHI
Reduction of life cycle cost (LCC) is an important problem on maintenance works for road structures.Long-lasting technology is one of promising methods for reducing of LCC. Initial cost is expensive, but maintenance costs decrease for long lasting technology. A required service level can be maintained over a long term and the LCC can be reduced.Technical development for a long lasting technology is required in recent years, because pavement administrators recommend that design life of asphalt pavements should be extended to 20 years.In this study, pavement damages were assessed conducting excavate investigation and surface condition survey on two lanes of the highway in Nagano Prefecture. The results showed that performance of bitumen stabilization base course should be improved as one of the efforts aimed at extending the life of the asphalt pavement. However bitumen stabilization base course materials haven”Ēt been discussed as research level.This study assessed field performance of bitumen stabilization base course material conducting evaluation tests and explored improving methods by re-examining the aggregate gradation and the asphalt content.
It was found that cracking resistance of bituminous stabilization base course was considerably low compared to that of surface course and binder course.
Furthermore, cracking resistance could be slightly improved for a bituminous stabilization base newly fabricated with miner revision of aggregate gradation and asphalt content.
This study clarified basic characteristics of bituminous stabilization base course and the importance of that as a structural composition of the asphalt layers.
Several findings on improvement in performance of bituminous stabilization base course material were also introduced from the study.
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