Since 2000, the number of facilities to produce the ash molten slag has rapidly increased in Japan. But, the place where the ash molten slag is used as construction material is limited such a municipality as ash molten slag facility is located. So, it is necessary to establish effective uses other than aggregate in base course of a road or as aggregate in ready mixed concrete for building, etc.
In this research, physical properties of ash molten slag were studied by conducting sieving tests, density tests, compaction tests. The elution tests and the content tests on four typical heavy metals, such as Pb, Cd, As and Cr6+, were also conducted to confirm its safety. Then the ash molten slag was mixed with bentonite changing the addition ratio in dry mass. The compacted ash molten slag mixed with bentonite was tested to get its maximum density, optimum water content, unconfined compression strength, shear strength parameters and coefficient of permeability.
As a result, it was found that the bentonite mixed molten slag can be used as alternative soil materials for barrier course in waste landfill.