Participatory project to improve trafficability of unpaved road at delta in rural area of Bangladesh

抄録

Bangladesh is almost a complete delta area located at the apex of the Bay of Bengal in the Indian sub-continent of South Asia. The land is composed of around 80% clay soil, such that rural soil roads are impassable in the rainy season. For this reason, the locally available geotextile technology, called Do-nou technology in Japanese and consisting of the piling up of soil-filled sacks, was applied to build a base course by members of the community. Do-nou technology has been adopted to reinforce the bearing capacity of the base course, which normally consists of sandy gravel materials, to improve trafficability. However, in rural areas of Bangladesh, it is difficult to obtain reasonable base course materials. In this study, crushed bricks have been identified as one of the alternatives for base course materials. It is anticipated that reinforcing the shear strength of the inner materials through Do-nou technology will make crushed bricks applicable to the base course of roads. Crushed bricks are available and cheap, and they can be utilized as coarse aggregates of concrete as a substitute for traditionally applied crushed stones. In this paper, the construction costs and the productivity are examined in advance of further research.