Staff Members - Benha University
Understanding the mechanism of decomposition reactions of neat and superplasticized ordinary Portland cement pastes using thermal analysis
Journal of Silicate Based and Composite Materials • 2018
Publication Information
Authors
Elshafei A. M. Gad, Amr Osman Habib, Mahmoud M. Mousa
Keywords
Science
Journal
Journal of Silicate Based and Composite Materials
Publisher
Not Available
Volume
70
Issue
3
Pages
98-103
publication.type
International
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
the effect of polycarboxylate superplasticizer on thermal stability and the kinetic thermal
decomposition of oPc without and with 1.0 and 1.5% wt% plasticizer has been studied at
temperature range of 30-1000 oc. the study was done by means of thermogravimetry (tG)
technique under non-isothermal condition at a heating rate of 10 k/min. the results showed
that the decomposition occurs for the superplasticized and neat oPc paste in three steps. the
neat oPc was found to decompose at higher temperatures than those for the superplasticized
paste. the kinetic parameters for each one of the decomposition steps were calculated through
four calculation methods and the kinetic mechanisms were determined from the thermal data
analysis using 35 solid state reaction models. the results showed that the mechanisms of
decomposition steps depend on the percentage of the superplasticizer added to the paste. the
thermodynamic parameters ΔS#, Δh# and ΔG# were also computed and discussed.
decomposition of oPc without and with 1.0 and 1.5% wt% plasticizer has been studied at
temperature range of 30-1000 oc. the study was done by means of thermogravimetry (tG)
technique under non-isothermal condition at a heating rate of 10 k/min. the results showed
that the decomposition occurs for the superplasticized and neat oPc paste in three steps. the
neat oPc was found to decompose at higher temperatures than those for the superplasticized
paste. the kinetic parameters for each one of the decomposition steps were calculated through
four calculation methods and the kinetic mechanisms were determined from the thermal data
analysis using 35 solid state reaction models. the results showed that the mechanisms of
decomposition steps depend on the percentage of the superplasticizer added to the paste. the
thermodynamic parameters ΔS#, Δh# and ΔG# were also computed and discussed.