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Using fly ash to improve the properties of polymer in ground waste concrete base

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Document pages: 10 pages

Abstract: The demolition of deteriorating infrastructure will produce a large amount of waste concrete. The storage of waste concrete involves expensive transportation, limited landfill space consumption and serious environmental problems. Combined with these factors, the recycling of waste concrete is mainly limited to the use of recycled aggregate in non structural filler and base course. Considering the limited geological polymerization potential of waste concrete, this study investigated the feasibility of using fly ash to enhance the base polymer of ground waste concrete in order to recover and utilize waste concrete in high-specification applications. The unconfined compressive strength of the adhesive synthesized under different fly ash content, NaOH concentration and curing time was evaluated. Scanning electron microscope 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.

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