MATERIAL PROPERTIES OF CONCRETE MIXED WITH MUNICIPAL SOLID WASTE INCINERATION ASH FOR CEMENT REPLACEMENT

Abstract

In Japan, a large amount of municipal solid waste (MSW) is discharged, most of which is incinerated. Although most MSW incineration residues are buried in final disposal sites, it is necessary to reduce the amount of MSW incineration residues because of the tight disposal capacity in Japan's final disposal sites. In order to reduce the amount of MSW incineration residues, there is an urgent need to recycle MSW incineration ash (MSWIA), which represents a large part of MSW incineration residues. On the other hand, MSWIA contains heavy metals, and there are concerns about the leaching of heavy metals depending on the recycling method. Therefore, one possible way to recycle MSWIA while preventing the leaching of heavy metals contained in MSWIA is to mix MSWIA into concrete. However, when MSWIA is replaced as a part of cement, the performance of concrete mixed with MSWIA in terms of compressive strength and prevention of heavy metal leaching may be lower than that of ordinary concrete without MSWIA. In this study, in order to determine whether or not concrete mixed with MSWIA as a partial replacement for cement can be used in a field, a slump test, an air content test, a bleeding test, a compressive strength test, a length change measurement, and a heavy metal leaching test are conducted, and material properties of the concrete are investigated. The results of various tests proved that concrete mixed with MSWIA can be used as well as ordinary concrete without MSWIA.