Municipal solid waste (MSW) created in modern households is usually sorted and partially reused or recycled, whereas the rest is ether disposed or incinerated. Incineration significantly reduces ...volume of waste but bottom ash (BA), which is a major solid residue of incineration process, requires special treatment when it is disposed in landfills. Nevertheless, quantity BA of is still large. On the other hand, BA is composed of the same oxides as cement and its applicability as binder in cementitious compounds has already been considered. It was concluded that the quantity of Ca0 in BA and combustion temperature in two-chamber incinerator are too low for formation of essential clinker compounds. Hence, binding abilities of BA are rather poor. In order to improve them, BA was mixed with lime (Ca0) using weight ratio 3: 2 and this mixture was gradually heated to 1300 °C, where oxides were supposed to recombine. Consequently hard porous material was formed. After cooling, it was grinded and sieved through 0.09 mm screen. Such modified BA was afterwards tested as cement substitute. Standard specimens fortesting flexural and compressive strength of cement were prepared using binder composed of cement CEM 142.5 R and up to 40 wt.% of modified BA. Flexural and compressive strength were tested after 2, 7 and 28 days. Results of the experiment showed that no improvement of binding abilities was achieved as the result of BA modification.
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