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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.19 [2012] >
IJEMS Vol.19(1) [February 2012] >
| Title: | Recycling of modified MSWI ash-mix slag and CMP sludge as a cement substitute and its optimal composition |
| Authors: | Chang, Chieh-Jen
Tseng, Liang
Lin, Ta-Sen
Wang, Wei-Jer
Lee, Tzen-Chin |
| Keywords: | MSWI ash-mix
CMP sludge
Composite cement mortars
Design of experiments
Analysis of variance |
| Issue Date: | Feb-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Modified
municipal solid waste incinerator (MSWI) ash-mix slag
and chemical mechanical polishing (CMP) sludge are recycled together to partly replace cement
in cement mortars. The main objective of this study is to fully reuse scrubber
ash and fly ash from an MSWI, improve their compressive strengths, and then
acquire their optimal composition through the design of
experiments (DOE) and analysis of variance (ANOVA). Four control factors,
including (i) cementitious usage,
(ii) modified ash-mix slag substitute, (iii) water-to-cementitious
ratio and (iv) CMP sludge, each of which are substituted with three levels, are
considered to investigate the optimal parameter settings. The ANOVA analysis indicates that the first three factors are significant and
strongly affect the compressive strength of the mortar samples. The reliability
of the experiments and the rationality of the variances fall within a
confidence level of 95%, indicating that the design for the
composite cement mortars is robust. The reconfirmation test
demonstrates that the compressive strength of the mortar can reach
52.85 MPa (152% of
that of plain cement mortar) under the optimal
composition (34 wt%
of cement replacement). This study reveals that we can fully utilize
the fly and scrubber ashes, and the test results confirm
the feasibility of substantial
cement replacement with modified MSWI ash-mix slag
and CMP sludge.
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| Page(s): | 31-40 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.19(1) [February 2012]
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