DEVELOPMENT OF LONG-LIFE ROADBED IMPROVEMENT PROCEDURE FOR ROAD PAVEMENT USING GEOSYNTHETICS

－CHARACTERISTICS OF ROADBED MATERIAL AND GEOSYNTHETICS COMPOSITE STRUCTURE－

Abstract

This study proposes a roadbed improvement procedure using Geosynthetics for road pavement in which the repair of road surface is repeated at significant frequency due to early deterioration. While the deteriorated road is generally repaired by cutting and overlay of road surface, it is not established the reinforced procedure for roadbed material by Geosynthetics. In order to prolong the life of road pavement, authors propose to reinforce the roadbed material such as asphalt mixture and crushed stone by using Geosynthetics as a new improvement procedure. This paper reports the strength and deformation characteristics of roadbed material and geosynthetics composite structure obtained from the bending test for the geogrid reinforced asphalt mixture and compression test for the geocell confined crushed stone.