Leaching of Trace Elements and Hydrated Products from Cement and Concrete

Abstract

This paper summarizes the leaching of trace elements and hydrated products from cement and concrete. Leaching of hydrated products from hardened concrete is very important problem for the construction of the artificial barrier for radioactive waste disposal facilities which is required long-term duarability. The mechanisms and the various models of leaching of hydrated products form hardened concrete and the accelerating test are describes. For environmental compatibility of cement and concrete, the summarize the state of the art for the leaching of trace elements such as Cr (VI) form cement and concrete are necessary. This paper outlines the contents of trace elements of cement and mineral admixtures and endocrine disrupters in chemical admixtures. And the leaching of trace elements from cement and concrete is described. For example, Cr (VI) is detected in fresh concrete. However, the leaching of Cr (VI) form hardened concrete is not observed. In addition. the method for tank leaching test which proposed by technical committee are introduced.