Influence of external factors on leaching of hexavalent chro1vewm from concrete waste

In this paper, the influence of the external factors on the amount of hexavalent chromium Cr(VI) released from the concrete waste and the adsorption/reduction action caused by the surround soil, was investigated. The following results were obtained. 1. Serial batch test using mildly nitric acid solution is expected to be able to assess available amount for leaching under the general environment. 2. In case of the carbonation sample, the dissolution continued under the soaking condition, after the 91 days. 3. Blast-furnace slag fine aggregate and the powder reduced Cr(VI).4. Volcanic cohesive soil and organic soil have the capacity of absorption/reduction.