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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.
Page(s): 31-40
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.19(1) [February 2012]

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