Evaluation of Fly Ash from Co-Combustion of Paper Mill Wastes and Coal as Supplementary Cementitious Materials
Abstract
:1. Introduction
2. Materials and Experimental Methods
2.1. Waste-Derived Fuel from Paper Mill
2.2. Co-Combustion Fly Ash from CFB Boilers
2.3. Research Methods
2.3.1. CCFA Characteristics
2.3.2. Evaluation as Cementitious Materials
3. Results
3.1. CCFA Characteristics
3.2. Performance Evaluation as Cementitious Materials
3.2.1. Performance Testing of Cement Paste
3.2.2. Compressive Strength Test of Cement Mortar
4. Conclusions
- The material characteristics of CCFA are largely affected by the fuel source type. The high calcium content of PPMS-CCFA comes from the calcium carbonate filler in PPMS, while the chemical compositions of PR-CCFA are mainly silicon and aluminum minerals, as the fuel sources are mainly plastics and fibers.
- The mineralogical and thermal analyses of CCFA highlighted the differences in the type of desulfurization system in the form of sulfate present in the fly ash. The presence of calcium sulfite hemihydrate in PPMS-CCFA causes a high loss on ignition and significant increases in setting time when the ash is used in replacement of cement.
- The particle size of CCFA falls in the range of about 4 to 100 μm. The dominant particles of CCFA are granular and irregularly shaped, with a rough and porous surface texture. The porous surface of CCFA particles tends to increase the water requirement as the ash is used in cement mixtures.
- The compressive strength of mortars containing 20% CCFA shows a relatively slow development with curing time. The strength activity index of the two CCFAs studied is either satisfactory according to the requirement for coal fly ash or increasing with time and exhibiting a characteristic of pozzolanic reaction. These results confirmed that fly ash from the co-combustion of paper mill wastes and coal has the potential to be used as cementitious materials in partial replacement of cement.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Sample | Chemical Composition (%) | |||||||
---|---|---|---|---|---|---|---|---|
SiO2 | Al2O3 | Fe2O3 | CaO | MgO | TiO2 | SO3 | P2O5 | |
PCFA | 55.7 | 29.3 | 5.42 | 3.86 | 1.34 | 0.63 | 0.57 | 0.51 |
PPMS-CCFA | 29.8 | 14.5 | 3.93 | 43.1 | 2.34 | 1.04 | 3.93 | 0.59 |
PR-CCFA | 50.0 | 29.2 | 6.06 | 9.47 | 0.93 | 2.19 | 1.38 | 0.25 |
PCFA | PPMS-CCFA | PR-CCFA | |
---|---|---|---|
Relative Density | 2.27 | 2.48 | 2.30 |
Fineness (retained on #325 sieve), % | 20 | 18 | 24 |
Particle Size, µm (d10) | 3.35 | 3.67 | 4.05 |
(d50) | 21.08 | 21.04 | 26.12 |
(d90) | 72.81 | 79.62 | 101.48 |
LOI (550 °C), % | 0.3 | 7.2 | 2.7 |
LOI (750 °C), % | 0.4 | 13.2 | 4.7 |
pH | 10.9 | 8.3 | 11.2 |
Mixture ID | Mix Proportion (%) | Water Requirement for Normal Consistency (%) | Time of Setting (Minute) | Autoclave Expansion (%) | ||
---|---|---|---|---|---|---|
Cement | FA | Initial Setting | Final Setting | |||
OPC (control) | 100 | 0 | 25 | 165 | 220 | 0.10 |
PCFA | 80 | 20 | 26 | 185 | 235 | 0.04 |
PPMS-CCFA | 80 | 20 | 30 | 280 | 375 | 0.07 |
PR-CCFA | 80 | 20 | 28 | 205 | 245 | 0.08 |
Mixture ID | Weight (g) | Water Requirement (%) | |||
---|---|---|---|---|---|
Cement | FA | Sand | Water | ||
OPC (control) | 1000 | 0 | 2750 | 485 | 100 |
PCFA | 800 | 200 | 2750 | 485 | 102 |
PPMS-CCFA | 800 | 200 | 2750 | 540 | 111 |
PR-CCFA | 800 | 200 | 2750 | 530 | 109 |
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Wu, M.-F.; Huang, W.-H. Evaluation of Fly Ash from Co-Combustion of Paper Mill Wastes and Coal as Supplementary Cementitious Materials. Materials 2022, 15, 8931. https://doi.org/10.3390/ma15248931
Wu M-F, Huang W-H. Evaluation of Fly Ash from Co-Combustion of Paper Mill Wastes and Coal as Supplementary Cementitious Materials. Materials. 2022; 15(24):8931. https://doi.org/10.3390/ma15248931
Chicago/Turabian StyleWu, Ming-Fu, and Wei-Hsing Huang. 2022. "Evaluation of Fly Ash from Co-Combustion of Paper Mill Wastes and Coal as Supplementary Cementitious Materials" Materials 15, no. 24: 8931. https://doi.org/10.3390/ma15248931