Upgrading and Evaluation of Waste Paper Sludge Ash in Eco-Lightweight Cement Composites
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 3
Abstract
The upgrading and evaluation of waste paper sludge fly ash (PsFA) as a cement substitute in wood-wool composite boards (WWCB) is investigated in the present study. This type of board is widely applied in the building environment because of its excellent thermal and acoustical properties; however, cement is still widely used as a binder although environmentally its use leads to a high footprint of the composite and is therefore less favorable for sustainable building designs. Paper sludge fly ash could be a feasible replacement of cement; however, its high water demand limits the substitution level to 10% by mass of binder. Therefore, different upgrading methods including water treatment and thermal treatment are performed, and their effects are evaluated using various analytical methods. Afterward, PsFA’s suitability as a binder replacer in WWCB is investigated with the hypothesis to refine the microstructure of the boards, resulting in extra lightweight properties. A substitution level of binder with the upgraded PsFA by 20–60% in WWCB can be achieved and is confirmed by the improved mechanical, thermal-insulating, and sound-absorbing properties.
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Acknowledgments
The authors would like to acknowledge the support from Dr. Miruna Florea for the TG analysis and Dip. Min. Katrin Schollbach for the XRD analysis. Moreover, STW-foundation, Dr. Jan van Dam (Wageningen UR), Knauf Insulation, ENCI B.V., Eltomation, and van Gansewinkel minerals are acknowledged for the financial support and provision of materials.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 3 • March 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 20, 2016
Accepted: Sep 6, 2017
Published online: Jan 11, 2018
Published in print: Mar 1, 2018
Discussion open until: Jun 11, 2018
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