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A platform for research: civil engineering, architecture and urbanism
Durability of calcium-rich municipal solid waste incineration fly ash-based geopolymer to sulfate and sulfuric acid
https://orcid.org/0000-0001-9570-7997
https://orcid.org/0000-0003-0188-5499
Graphical abstract Display Omitted
Highlights Durability of MSWIFA-based geopolymer in Na2SO4 and H2SO4 for 112 days was studied. Na2SO4 hardly eroded the insoluble CaCO3 in the MSWIFA-based geopolymer. H2SO4 erosion of MSWIFA-based geopolymer included decalcification and dealumination. Gypsum formed from CaCO3 or C-A-S-H gel led to decalcification and crack formation. Solidification efficiency of Pb and Zn was strongly related to dealumination process.
Abstract To evaluate the feasibility and safety of municipal solid waste incineration fly ash (MSWIFA)-based geopolymer, its durability against water, 3% Na2SO4, 1% H2SO4 and 3% H2SO4 for 112 days was investigated. Results showed that H2SO4 resistance of MSWIFA-based geopolymers was weaker than that of Na2SO4 and deteriorated with increasing MSWIFA incorporation and H2SO4 concentration. Under H2SO4 erosion, CaCO3 or C-A-S-H gels formed CaSO4·2H2O, and this decalcification process caused cracks formation. Dealumination disrupted the electrostatic interaction of [AlO4]- and Al-O coordination, reducing the solidification efficiency of Zn and Pb significantly. Conversely, Cu and Cr with Si-O coordination exhibited greater than 70% solidification efficiency.
Durability of calcium-rich municipal solid waste incineration fly ash-based geopolymer to sulfate and sulfuric acid
https://orcid.org/0000-0001-9570-7997
https://orcid.org/0000-0003-0188-5499
Graphical abstract Display Omitted
Highlights Durability of MSWIFA-based geopolymer in Na2SO4 and H2SO4 for 112 days was studied. Na2SO4 hardly eroded the insoluble CaCO3 in the MSWIFA-based geopolymer. H2SO4 erosion of MSWIFA-based geopolymer included decalcification and dealumination. Gypsum formed from CaCO3 or C-A-S-H gel led to decalcification and crack formation. Solidification efficiency of Pb and Zn was strongly related to dealumination process.
Abstract To evaluate the feasibility and safety of municipal solid waste incineration fly ash (MSWIFA)-based geopolymer, its durability against water, 3% Na2SO4, 1% H2SO4 and 3% H2SO4 for 112 days was investigated. Results showed that H2SO4 resistance of MSWIFA-based geopolymers was weaker than that of Na2SO4 and deteriorated with increasing MSWIFA incorporation and H2SO4 concentration. Under H2SO4 erosion, CaCO3 or C-A-S-H gels formed CaSO4·2H2O, and this decalcification process caused cracks formation. Dealumination disrupted the electrostatic interaction of [AlO4]- and Al-O coordination, reducing the solidification efficiency of Zn and Pb significantly. Conversely, Cu and Cr with Si-O coordination exhibited greater than 70% solidification efficiency.
Durability of calcium-rich municipal solid waste incineration fly ash-based geopolymer to sulfate and sulfuric acid
https://orcid.org/0000-0001-9570-7997
https://orcid.org/0000-0003-0188-5499
Graphical abstract Display Omitted
Highlights Durability of MSWIFA-based geopolymer in Na2SO4 and H2SO4 for 112 days was studied. Na2SO4 hardly eroded the insoluble CaCO3 in the MSWIFA-based geopolymer. H2SO4 erosion of MSWIFA-based geopolymer included decalcification and dealumination. Gypsum formed from CaCO3 or C-A-S-H gel led to decalcification and crack formation. Solidification efficiency of Pb and Zn was strongly related to dealumination process.
Abstract To evaluate the feasibility and safety of municipal solid waste incineration fly ash (MSWIFA)-based geopolymer, its durability against water, 3% Na2SO4, 1% H2SO4 and 3% H2SO4 for 112 days was investigated. Results showed that H2SO4 resistance of MSWIFA-based geopolymers was weaker than that of Na2SO4 and deteriorated with increasing MSWIFA incorporation and H2SO4 concentration. Under H2SO4 erosion, CaCO3 or C-A-S-H gels formed CaSO4·2H2O, and this decalcification process caused cracks formation. Dealumination disrupted the electrostatic interaction of [AlO4]- and Al-O coordination, reducing the solidification efficiency of Zn and Pb significantly. Conversely, Cu and Cr with Si-O coordination exhibited greater than 70% solidification efficiency.
Durability of calcium-rich municipal solid waste incineration fly ash-based geopolymer to sulfate and sulfuric acid
Cao, Xing (author) / Yang, Weichen (author) / Liu, Shiwei (author) / Fang, Lin (author) / Liu, Runjie (author) / Ma, Rui (author)
2023-09-15
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2013