|
" Production and Characterization of Eco-Cement from Municipal Solid Waste Incineration Residues "
Ashraf, Muhammad Shoaib
Shao, Yixin
| Document Type
|
:
|
Latin Dissertation
|
| Language of Document
|
:
|
English
|
| Record Number
|
:
|
1107827
|
| Doc. No
|
:
|
TLpq2457690146
|
| Main Entry
|
:
|
Ashraf, Muhammad Shoaib
|
|
|
:
|
Shao, Yixin
|
| Title & Author
|
:
|
Production and Characterization of Eco-Cement from Municipal Solid Waste Incineration Residues\ Ashraf, Muhammad ShoaibShao, Yixin
|
| College
|
:
|
McGill University (Canada)
|
| Date
|
:
|
2019
|
| student score
|
:
|
2019
|
| Degree
|
:
|
Ph.D.
|
| Page No
|
:
|
181
|
| Abstract
|
:
|
This research program was aimed at developing cement ecologically from municipal solid waste incineration (MSWI) residues utilizing the wastes, reducing carbon emission and minimizing the natural resource consumption. Two types of eco-cements were produced; one with 100% MSWI residues and the other with 94% MSWI residues and 6% additives, with a clinkering temperature of 1100°C. The eco-cement demonstrated non-hydraulic behavior; however, it could be consolidated upon carbonation activation, forming a binding matrix comprised of amorphous calcium silicate hydrocarbonate, CaCO3, and gypsum. Carbonation activation of eco-cement for two hours showed compressive strength comparable to the 28 days strength of ordinary Portland cement upon hydration. Carbonation up to twelve hours further improved the compressive strength by 50% in comparison to the two hours results. Microstructural studies confirmed chloroellestadite (CE) and belite as the main strength contributors along with CO2 reactive phases in the eco-cement. For a better understanding of the carbonation reactivity and strength contribution of these phases, both chloroellestadite and belite were synthesized. Carbonation cured synthesized CE and belite showed strength behavior similar to that of eco-cement, and the carbonation-derived phases of synthesized compounds confirmed the development of CaCO3, gypsum, and calcium silicate hydrocarbonate as a strength contributing matrix. Eco-concrete slabs were produced to assess the binding properties of the eco-cement with compressive strength comparable to that of OPC concrete. Finally, extensive environmental testing results showed that the clinkering and carbonation curing process helped immobilize the hazardous elements such as heavy metals, organic compounds and dioxin, and furans. These results show that eco-cement can be safely used in commercial applications.
|
| Subject
|
:
|
Civil engineering
|
|
|
:
|
Environmental engineering
|
| |