A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Mechanical properties of phosphogypsum-soil stabilized by lime activated ground granulated blast-furnace slag
https://orcid.org/0000-0001-7335-4182
Highlights Lime-activated ground granulated blast-furnace slag stabilizes phosphogypsum soil. Adding phosphogypsum to the stabilized soil enhanced compressive properties. Adding phosphogypsum to the stabilized soil enhanced dynamic elastic properties. The stabilized phosphogypsum hydration products are mainly ettringite and C-S-H. After stabilization, the content of phosphorus and fluorine impurities in PG reduced.
Abstract A large amount of phosphogypsum (PG, a solid waste) has been produced with the development of the industry. Activated ground granulated blast-furnace slag (GGBS) has been considered an effective solution for stabilizing PG in road construction. However, the mechanical properties of PG stabilized by lime-activated GGBS are not understood. This study attempted to mix PG and soil to make a PG-soil, and lime-activated GGBS was used as a treatment agent. The compaction test and unconfined compression strength test were conducted to investigate the mechanical properties of the specimens. A fatigue testing system was used to analyze the dynamic elastic properties of lime-GGBS stabilized PG. X-ray diffraction and scanning electron microscopy were used to study their mineralogy and microstructure. The results showed that the strength increase of stabilized specimens containing PG was 239.49% when the ratio of lime and GGBS (wt%) was 1:9 (the lime content was 1.5% of PG dry weight), compared to stabilized PG-free specimens. Under the same stress peak, the dynamic elastic modulus of the stabilized specimens containing PG was increased by 48.68% compared to stabilized PG-free specimens. Under higher stress peaks, the stabilized specimen without PG failed, whereas those containing PG merely experienced a decrease in dynamic elastic modulus. As the content of PG increased, more ettringite was generated. Additionally, the lime-activated-GGBS binder removed P and F impurities from PG. The results of this study can provide a reference for utilizing PG as a filling material for the embankment.
Mechanical properties of phosphogypsum-soil stabilized by lime activated ground granulated blast-furnace slag
https://orcid.org/0000-0001-7335-4182
Highlights Lime-activated ground granulated blast-furnace slag stabilizes phosphogypsum soil. Adding phosphogypsum to the stabilized soil enhanced compressive properties. Adding phosphogypsum to the stabilized soil enhanced dynamic elastic properties. The stabilized phosphogypsum hydration products are mainly ettringite and C-S-H. After stabilization, the content of phosphorus and fluorine impurities in PG reduced.
Abstract A large amount of phosphogypsum (PG, a solid waste) has been produced with the development of the industry. Activated ground granulated blast-furnace slag (GGBS) has been considered an effective solution for stabilizing PG in road construction. However, the mechanical properties of PG stabilized by lime-activated GGBS are not understood. This study attempted to mix PG and soil to make a PG-soil, and lime-activated GGBS was used as a treatment agent. The compaction test and unconfined compression strength test were conducted to investigate the mechanical properties of the specimens. A fatigue testing system was used to analyze the dynamic elastic properties of lime-GGBS stabilized PG. X-ray diffraction and scanning electron microscopy were used to study their mineralogy and microstructure. The results showed that the strength increase of stabilized specimens containing PG was 239.49% when the ratio of lime and GGBS (wt%) was 1:9 (the lime content was 1.5% of PG dry weight), compared to stabilized PG-free specimens. Under the same stress peak, the dynamic elastic modulus of the stabilized specimens containing PG was increased by 48.68% compared to stabilized PG-free specimens. Under higher stress peaks, the stabilized specimen without PG failed, whereas those containing PG merely experienced a decrease in dynamic elastic modulus. As the content of PG increased, more ettringite was generated. Additionally, the lime-activated-GGBS binder removed P and F impurities from PG. The results of this study can provide a reference for utilizing PG as a filling material for the embankment.
Mechanical properties of phosphogypsum-soil stabilized by lime activated ground granulated blast-furnace slag
https://orcid.org/0000-0001-7335-4182
Highlights Lime-activated ground granulated blast-furnace slag stabilizes phosphogypsum soil. Adding phosphogypsum to the stabilized soil enhanced compressive properties. Adding phosphogypsum to the stabilized soil enhanced dynamic elastic properties. The stabilized phosphogypsum hydration products are mainly ettringite and C-S-H. After stabilization, the content of phosphorus and fluorine impurities in PG reduced.
Abstract A large amount of phosphogypsum (PG, a solid waste) has been produced with the development of the industry. Activated ground granulated blast-furnace slag (GGBS) has been considered an effective solution for stabilizing PG in road construction. However, the mechanical properties of PG stabilized by lime-activated GGBS are not understood. This study attempted to mix PG and soil to make a PG-soil, and lime-activated GGBS was used as a treatment agent. The compaction test and unconfined compression strength test were conducted to investigate the mechanical properties of the specimens. A fatigue testing system was used to analyze the dynamic elastic properties of lime-GGBS stabilized PG. X-ray diffraction and scanning electron microscopy were used to study their mineralogy and microstructure. The results showed that the strength increase of stabilized specimens containing PG was 239.49% when the ratio of lime and GGBS (wt%) was 1:9 (the lime content was 1.5% of PG dry weight), compared to stabilized PG-free specimens. Under the same stress peak, the dynamic elastic modulus of the stabilized specimens containing PG was increased by 48.68% compared to stabilized PG-free specimens. Under higher stress peaks, the stabilized specimen without PG failed, whereas those containing PG merely experienced a decrease in dynamic elastic modulus. As the content of PG increased, more ettringite was generated. Additionally, the lime-activated-GGBS binder removed P and F impurities from PG. The results of this study can provide a reference for utilizing PG as a filling material for the embankment.
Mechanical properties of phosphogypsum-soil stabilized by lime activated ground granulated blast-furnace slag
Zheng, Pangkun (author) / Li, Wentao (author) / Ma, Qiang (author) / Xi, Lei (author)
2023-08-14
Article (Journal)
Electronic Resource
English
Soil Stabilization Using Lime-Activated Ground Granulated Blast Furnace Slag
| British Library Conference Proceedings | 1998