Utilization of Fly Ash to Enhance Ground Waste Concrete-Based Geopolymer
Demolition of the deteriorating infrastructure produces a large amount of waste concrete. Storage of waste concrete involves costly transportation, consumption of limited landfill space, and serious environmental problems. Combining them, the recycling of waste concrete is mainly limited to the use...
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| Format: | Article |
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Wiley
2018-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/4793917 |
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| author | Wu Chen Zhiduo Zhu |
| author_facet | Wu Chen Zhiduo Zhu |
| author_sort | Wu Chen |
| collection | DOAJ |
| description | Demolition of the deteriorating infrastructure produces a large amount of waste concrete. Storage of waste concrete involves costly transportation, consumption of limited landfill space, and serious environmental problems. Combining them, the recycling of waste concrete is mainly limited to the use of recycled aggregates in the nonstructural filler and base course. Considering the limited geopolymerization potential of waste concrete, this study investigates the feasibility of using fly ash to enhance ground waste concrete-based geopolymer to recycle and utilize waste concrete in high-specification applications. The unconfined compressive strength of the binders synthesized at different fly ash contents, NaOH concentrations, and curing time are evaluated. Scanning electron microscopy/energy dispersive spectroscopy imaging, X-ray diffraction analyses, Fourier Transform Infra Red analyses, and Magic Angle Spinning-Nuclear Magnetic Resonance Spectroscopy techniques are also conducted to investigate the microstructure and phase/elemental compositions of the synthesized geopolymeric binders. The results indicate that the addition of fly ash to ground waste concrete profoundly enhances the strength of ground waste concrete-based geopolymer up to 75% fly ash content. The simultaneous formation of geopolymeric gel and CSH gel is responsible for the strength increase. The geopolymeric binder with required strength can be produced by the appropriate addition of fly ash to ground waste concrete. |
| format | Article |
| id | doaj-art-759954bee02e41caa9cb6ae44e6d39c4 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-759954bee02e41caa9cb6ae44e6d39c42025-02-03T05:58:40ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/47939174793917Utilization of Fly Ash to Enhance Ground Waste Concrete-Based GeopolymerWu Chen0Zhiduo Zhu1School of Transportation, Southeast University, 210096 Nanjing, ChinaSchool of Transportation, Southeast University, 210096 Nanjing, ChinaDemolition of the deteriorating infrastructure produces a large amount of waste concrete. Storage of waste concrete involves costly transportation, consumption of limited landfill space, and serious environmental problems. Combining them, the recycling of waste concrete is mainly limited to the use of recycled aggregates in the nonstructural filler and base course. Considering the limited geopolymerization potential of waste concrete, this study investigates the feasibility of using fly ash to enhance ground waste concrete-based geopolymer to recycle and utilize waste concrete in high-specification applications. The unconfined compressive strength of the binders synthesized at different fly ash contents, NaOH concentrations, and curing time are evaluated. Scanning electron microscopy/energy dispersive spectroscopy imaging, X-ray diffraction analyses, Fourier Transform Infra Red analyses, and Magic Angle Spinning-Nuclear Magnetic Resonance Spectroscopy techniques are also conducted to investigate the microstructure and phase/elemental compositions of the synthesized geopolymeric binders. The results indicate that the addition of fly ash to ground waste concrete profoundly enhances the strength of ground waste concrete-based geopolymer up to 75% fly ash content. The simultaneous formation of geopolymeric gel and CSH gel is responsible for the strength increase. The geopolymeric binder with required strength can be produced by the appropriate addition of fly ash to ground waste concrete.http://dx.doi.org/10.1155/2018/4793917 |
| spellingShingle | Wu Chen Zhiduo Zhu Utilization of Fly Ash to Enhance Ground Waste Concrete-Based Geopolymer Advances in Materials Science and Engineering |
| title | Utilization of Fly Ash to Enhance Ground Waste Concrete-Based Geopolymer |
| title_full | Utilization of Fly Ash to Enhance Ground Waste Concrete-Based Geopolymer |
| title_fullStr | Utilization of Fly Ash to Enhance Ground Waste Concrete-Based Geopolymer |
| title_full_unstemmed | Utilization of Fly Ash to Enhance Ground Waste Concrete-Based Geopolymer |
| title_short | Utilization of Fly Ash to Enhance Ground Waste Concrete-Based Geopolymer |
| title_sort | utilization of fly ash to enhance ground waste concrete based geopolymer |
| url | http://dx.doi.org/10.1155/2018/4793917 |
| work_keys_str_mv | AT wuchen utilizationofflyashtoenhancegroundwasteconcretebasedgeopolymer AT zhiduozhu utilizationofflyashtoenhancegroundwasteconcretebasedgeopolymer |