The Influence of Disused ZSM-5 on the Performance of Phosphogypsum-Based Autoclaved Aerated Concrete
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Composition Design of the AAC
2.3. Characterization
2.3.1. X-ray Diffraction
2.3.2. Mechanical Tests
2.3.3. Bulk Density Test
2.3.4. FT-IR Spectroscopy Test
2.3.5. TG Test
2.3.6. MIP Analysis
2.3.7. SEM and EDXS Analysis
3. Results and Discussion
3.1. X-ray Diffraction
3.2. The Foaming Property
3.3. Compressive Strength and Bulk Density
3.4. FT-IR Analysis
3.5. TG Analysis
3.6. MIP Analysis
3.7. SEM and EDX Analysis
4. Conclusions
- (1)
- PG-based AAC has a high bulk density, and the addition of disused ZSM-5 causes a decrease in the bulk density. The compressive strength and bulk density of the DZ4 sample (37.5% disused ZSM-5 and 25% waste PG) were 2.6 MPa and 520 kg/m3, respectively.
- (2)
- As the disused ZSM-5 content gradually increased, the pore distribution of the samples significantly changed. To be specific, the number of large-diameter pores increased, especially pores larger than 52 µm. These large-diameter pores decrease the strength of the sample while decreasing the bulk density of the AAC, which is the primary reason for adjusting the AAC from the B07 to B05 level.
- (3)
- As the content of disused ZSM-5 increases in the samples, the siliceous materials in the AAC increase, and more siliceous materials are involved in the formation of tobermorite, leading to a decrease in the Ca/Si of the final AAC products, which changes the morphology of tobermorite.
- (4)
- The addition of waste PG increases the residual gypsum content in the cement hydration process, which promotes the formation of ettringite.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Oxides | Fly Ash | Waste PG | Cement | Disused ZSM-5 |
---|---|---|---|---|
SiO2 | 52.99 | 3.67 | 21.70 | 94.23 |
Al2O3 | 30.93 | 0.23 | 5.75 | 0.48 |
Fe2O3 | 4.34 | 0.20 | 2.78 | 0.21 |
TiO2 | 2.20 | 0.01 | 0.28 | - |
CaO | 3.27 | 31.31 | 61.31 | 0.13 |
MgO | 1.51 | 0.03 | 2.50 | 1.29 |
SO3 | 0.27 | 42.94 | 3.44 | - |
K2O + Na2O | 1.96 | 0.05 | 0.95 | - |
P2O5 | - | 0.42 | - | - |
LOI | 2.53 | 21.14 | 1.29 | 3.66 |
Materiles | D50 (µm) | D90 (µm) |
---|---|---|
Fly ash | 20.4 | 54.69 |
Waste PG | 9.96 | 59.50 |
Disused ZSM-5 | 26.86 | 107.6 |
Specimen | Cement | Fly Ash | Disused ZSM-5 | Waste PG | Lime | Al Powder | W/S |
---|---|---|---|---|---|---|---|
DZ1 | 21.25% | 50% | 0% | 25% | 2.5% | 1.25% | 1 |
DZ2 | 21.25% | 37.5% | 12.5% | 25% | 2.5% | 1.25% | 1 |
DZ3 | 21.25% | 25% | 25% | 25% | 2.5% | 1.25% | 1 |
DZ4 | 21.25% | 12.5% | 37.5% | 25% | 2.5% | 1.25% | 1 |
Sample No. | Porosity (%) |
---|---|
DZ1 | 60.24 |
DZ2 | 66.71 |
DZ3 | 70.81 |
DZ4 | 75.44 |
Samples No. | Pore Size Distribution by Volume Ratio (%) | ||
---|---|---|---|
<0.1 µm | 0.1–52 µm | >52 µm | |
DZ1 | 40.2 | 52.5 | 7.3 |
DZ2 | 37.9 | 51.4 | 10.7 |
DZ3 | 35.2 | 51.3 | 13.5 |
DZ4 | 33.7 | 46.1 | 20.2 |
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Zhou, H.; Wang, J.; Jiang, Y.; Liang, R.; Ma, B.; Zhang, H.; Qian, B.; Hu, Y. The Influence of Disused ZSM-5 on the Performance of Phosphogypsum-Based Autoclaved Aerated Concrete. Buildings 2023, 13, 3012. https://doi.org/10.3390/buildings13123012
Zhou H, Wang J, Jiang Y, Liang R, Ma B, Zhang H, Qian B, Hu Y. The Influence of Disused ZSM-5 on the Performance of Phosphogypsum-Based Autoclaved Aerated Concrete. Buildings. 2023; 13(12):3012. https://doi.org/10.3390/buildings13123012
Chicago/Turabian StyleZhou, Hao, Jiaqing Wang, Yang Jiang, Ruihuan Liang, Bing Ma, Houhu Zhang, Binbin Qian, and Yueyang Hu. 2023. "The Influence of Disused ZSM-5 on the Performance of Phosphogypsum-Based Autoclaved Aerated Concrete" Buildings 13, no. 12: 3012. https://doi.org/10.3390/buildings13123012