Replacement of raw mix in cement production by municipal solid waste incineration ash

Summary

The feasibility of using municipal solid waste incineration  (MSWI) ash as a replacement in the raw mix in cement production was studied. It was shown that sieving, self-grinding, and magnetic separation processes are necessary to remove the debris, salt, and metal present in the MSWI ash. By using the pretreated MSWI ashes, the produced cement specimens were in compliance with the unconfined compressive strength (UCS) standard in Taiwan at low ash content (<5%). When the ash content is large (>10%),  the strength development of specimens is hindered due to the  deficient formation of the calcium silicate. The lime saturation factor (LSF) also shows a descending trend with increasing ash content. Thus, compositional effects should be taken into consideration when promoting the calcium silicate formation in the case of high ash replacement. The chemical composition was adjusted by adding 183 g calcium oxide per kilogram of cement raw mixture with 15% ash replacement. After adjustment, the cement developed a seven-  and fivefold increase on UCS compared with those without calcium oxide supplement at 3 and 7 days of curing, respectively.  11 refs.

Primary author(s): Shih P-H; Chang J-E; Chiang L-C

                            Taiwan,National Cheng Kung University; Taiwan,Fooyin University

Source: Cem.Concr.Res.

            33,No.11,2003,p.1831-1836


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