Effect of Municipal Solid Waste Incineration Fly Ash on Properties of Magnesium Potassium Phosphate Paste
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 11
Abstract
This paper studied the effect of municipal solid waste incineration fly ash (MSWI FA) on properties of magnesium potassium phosphate cement (MKPC) paste. MKPC pastes containing different contents of MSWI FA were prepared. Initial setting time and hydration temperature of fresh MKPC paste were tested. Compressive strength and shrinkage deformation of hardened MKPC paste were determined. Phase composition [via X-ray diffraction (XRD), energy dispersive spectrometry (EDS)], pore structure [via mercury intrusion porosimetry (MIP)], and morphology [via scanning electron microscopy (SEM)] of hardened MKPC paste were analyzed. Leaching concentrations of Pb and Cd from hardened MKPC pastes were detected. Compared with MKPC paste containing no MSWI FA, MKPC paste containing 10% MSWI FA had 20% higher 60-day compressive strength and 20% less 60-day shrinkage deformation. This was due to the higher early hydration degree and denser structure of MKPC paste containing MSWI FA. When the curing time was no less than 7 d, the leaching concentrations of Pb and Cd from MKPC pastes containing 5%–20% MSWI FA met the leaching requirement in the relevant Chinese national standard.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 51578475).
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 11 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Feb 4, 2017
Accepted: May 29, 2019
Published online: Aug 28, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 28, 2020
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