Development of a quality control system for decontaminated soil

Decontaminated soil is required to be reused as a recycled material, e.g., as an embankment. Decontaminated soils exhibit different properties according to their sources. When the soil properties are unstable, soils used in construction sites must be tested (e.g., soil compaction using a rammer). Therefore, the production and shipment of stable quality soils are indispensable to reduce on-site tasks and maintain stable construction quality. By focusing on a water content ratio that is highly correlated with the fine fraction ratio and strength, a device for measuring the water content ratio is introduced as an alternative to conventional soil tests. This test aims to develop a technology to produce stable quality mixtures by automatically measuring the water content ratio of soil to determine the proper combining ratio. Experiments were conducted by choosing the soil type as the parameter. Using this system, it is possible to produce a mixed material having an arbitrary synthetic water content ratio, and to manufacture a mixture material satisfying the targeted cone index. (author)