Performance Evaluation of Lightweight Pavement via Geo-Centrifuge Tests

摘要

Asphalt pavements on soft soils are very common in many parts of Korea. These result in long periods of soft soil treatment, increased treatment costs, residual settlement of asphalt pavements, increased maintenance costs, and so forth. To overcome these problems, a new asphalt pavement system was studied, featuring a permeable asphalt surface, lightweight base concrete, and pile foundations. The first objective of the study was to evaluate the mix design properties of the permeable asphalt pavement, such as the Marshall stability, flow, air voids, and elastic modulus. The second objective of the study was to evaluate the mixing ratio of water, cement, sand, and the bubble foaming agent, as well as the compressible and flexural strength. The third objective of the study was to determine the number of pile foundations and the spacing of each pile. To verify the performance of lightweight pavement systems on soft soil, geo-centrifuge tests were conducted. The 1/30 reduced lightweight pavement system model was used, and a maximum 30 g of accelerated loading was applied to the pavement system. The kaolinite was used to simulate the highly soft soils at ocean or riverside areas. The settlement of the pavement system and the stress-strain relationship and load-displacement of the pile foundations were determined. From our limited study, the use of lightweight pavement systems on soft soils could be an alternative construction method on soft soils to reduce the challenges of conventional design and constructions.