Effect of Municipal Solid Waste Incineration Fly Ash on Properties of Magnesium Potassium Phosphate Paste

AbstractThis 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 wer...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2019-11, Vol.31 (11)
Main Authors: Yang, Jianming, Zhen, Shucong, Wu, Qisheng
Format: Article
Language:English
Subjects:
Building materials
Cadmium
Civil engineering
Combustion
Compressive strength
Deformation
Fly ash
Hydration
Incineration
Intrusion
Leaching
Lead
Magnesium
Morphology
Municipal solid waste
Municipal waste management
Pastes
Phase composition
Porosity
Potassium
Potassium phosphates
Setting (hardening)
Shrinkage
Solid waste management
Technical Note
Technical Notes
Waste disposal
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Summary:AbstractThis 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.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0002923