Improvement of laboratory testing methods and their interpretation for simulating geo-environmental processes

在日本，岩土工程和岩土环境工程有助于废物和副产品的合理再利用/再循环，因为大量的废物不仅来自建筑工程，而且来自各行各业和人类活动，被广泛用作岩土材料。然而，应在每种特定应用的环境下仔细评估有毒物质对土壤和地下水造成的潜在污染。本研究开发了实验室测试方法及其解释，以模拟这些有毒物质在以下情况下的淋溶和迁移：1)通过加速试验从用作道路基层材料的循环混凝土集料中长期淋失六价铬；2)通过改进的间歇淋洗试验模拟重金属在沿海垃圾焚烧炉垃圾填埋场中的迁移；以及3)自然来源的含砷土壤的淋溶特性。

Geotechnical and geoenvironmental engineering has been contributed to the sound reuse/recycle of waste and by-products in Japan, since large amount of them not only from construction works but also from various industries and human activities has been widely utilized as geo-materials. However, the potential for soil and groundwater pollution due to toxic substances should be carefully assessed under the environment of each given application. This research have developed laboratory testing methods and their interpretation to simulate leaching and mobility of these toxic substances in the following situations ; 1) Long-term leaching behavior of hexavalent chromium from recycle concrete aggregate utilized as road base materials by employing acceleration tests, 2) Heavy metal mobility in coastal MSW incinerator ash landfill by developing modified batch leaching tests, and 3) Leaching characteristics of excavated soil containing arsenic by natural origin.