PERFORMANCE OF PERMEABLE PAVEMENTS UNDER HEAVY TRAFFIC

Development of permeable pavement, which has durability and sufficient permeability even under the condition of heavy traffic and/or soil sub-grade, has been necessary in recent years to prevent river flood in urban region. Laboratory tests, full-scale accelerated loading test and 3 years' test pavements constructed all over the Japan have clarified: 1) Permeable pavement on sand layer has the same durability as the ordinary pavement. 2) When the pavement need to be constructed on a soil layer, drainage from sub base-course could be an effective countermeasure to improve its durability. 3) Its permeability has not been deteriorated after 2-3 years service. 4) Permeable pavement could be effective for preventing river flood by reducing and delaying run-off.