Waste Molten Slag Evaluation through Diffusion Tests Designed for Various Utilization Conditions

概要

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In order to promote the use of waste molten slag as a construction material, the long-term environmental impact of slag must be appropriately evaluated. Slag is used in a variety of ways including as a roadbed material, as a concrete aggregate, etc. An evaluation method is required to reflect the different conditions of utilization. As for monolithic materials, diffusion tests have been used as a tool for estimating long-term environmental impact. In this paper, an application method for the diffusion test has been examined considering those cases where slag has been used directly as a roadbed material and as an aggregate in a mortar.<BR>The main results of the tests were : 1) An improved analysis method using a release flux slope was proposed ; 2) The specific surface area of a slag particle was calculated by determining the working sphericity ; 3) The size of slag particles for the execution of the diffusion test could be as small as one to two millimeters. Results showed that the release mechanism for slag was a diffusion-controlled type ; and 4) The potential environmental impact of slag in a mortar was not significant.