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Preparing new supplementary cementitious materials with co-calcined waste glass-dolomite and environmental assessment

Zhang, Shiyu ; Wang, Kai ; Zhang, Xiaoqiang ; Jiang, Yulong

Construction & building materials, 2023-07, Vol.389, p.131770, Article 131770 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Preparing new supplementary cementitious materials with co-calcined waste glass-dolomite and environmental assessment
  • Autor: Zhang, Shiyu ; Wang, Kai ; Zhang, Xiaoqiang ; Jiang, Yulong
  • Assuntos: Calcination ; Cemented paste backfill ; Non-cement clinker cementitious material ; Waste glass
  • É parte de: Construction & building materials, 2023-07, Vol.389, p.131770, Article 131770
  • Descrição: •The disposal of mixed calcination of waste glass–dolomite was proposed.•The thermal activation effect on mixed waste glass–dolomite was investigated.•The hydration of pastes with co-calcined waste glass–dolomite was explored.•Usage of pastes with co-calcined waste glass–dolomite in backfill saves costs and reduces CO2 emissions. Recycling waste glass (WG) for supplementary cementitious materials is one of the most viable methods to address the environmental issues of waste generation. In this study, homogenised WG–dolomite with different mass ratios was first calcined at 800 °C and 1000 °C. Then non-cement clinker cementitious materials (NCCMs) were prepared by mixing calcined WG–dolomite, superfine slag (SS) and flue gas desulphurisation gypsum. Finally, coupled with silica tailings, NCCMs were used to prepare cemented paste backfill (CPB) samples. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), Isothermal calorimeter, Thermogravimetry (TG) and scanning electron microscopy (SEM) were employed to study the thermal transformation of calcined WG–dolomite and microstruction evolution of NCCMs hydration. The experimental results show that the main products of calcined WG–dolomite have high contents of MgO, calcite and CaO at 800 °C, whereas they have large proportions of C2S and CA at 1,000 °C. As the calcination temperature increases, the chemical shift of 29Si moves steadily towards higher frequencies, indicating the dominance of Q0/Q1 sites from silicate. In addition, the high contents of MgO and CaO in calcined WG–dolomite accelerate NCCM paste hydration, which is conducive to the formation of C–A–S–H and M−S−H. Moreover, due to SS hydration being more dependent on alkaline environments, co-calcined WG-dolomite at 800 °C enables the CPB sample to have better mechanical performance.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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