EFFECT EVALUATION OF FREEZE-THAW ON RESILIENT MODULUS OF UNSATURATED GRANULAR BASE COURSE MATERIAL

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  • 不飽和粒状路盤材のレジリエントモデュラスに及ぼす凍結融解作用の影響評価

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 This paper examines the effects of freeze-thaw and water content on the resilient deformation characteristics of subbase course materials to evaluate the mechanical behavior of granular base in cold regions. A series of resilient modulus tests on subbase course materials under various water contents were conducted using a newly developed test apparatus. Besides, the test results were compared with the results of freeze-thaw CBR tests and the long-term field measurement at a model pavement structure including FWD tests. As the results, it was revealed that the resilient deformation characteristics of unbound granular base course materials deteriorate due to freeze-thaw and increment of the water content in thawing season. This indicates that the freeze-thaw of granular base has a strong influence on the fatigue life of pavement structures.

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