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<p>In this study, a novel ternary low-carbon cementitious materials (LCCMs) was prepared by using modified CGCS (Coal Gasification Coarse Slag), ground granulated blast-furnace slag (GGBS), and municipal solid waste incineration fly ash (MSWI FA) as precursors and water glass and sodium hydroxide as alkaline exciters. The effects of CGCS dosage, water glass modulus, and alkali equivalent on the fluidity, setting time, and uniaxial compressive strength (UCS) of the LCCMs were systematically studied using response surface methodology with a Box-Behnken Design (BBD). The optimal ratio was determined by regression. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis/differential thermal analysis (TGA/DTA), and inductively coupled plasma-mass spectrometry (ICP-MS) revealed the strength formation mechanism of LCCMs and the heavy metals solidification mechanism. The results showed that each factor had a significant effect on the response variables, and the interactions of some factors had a significant effect. The regression coefficients (<i>R</i><sup><i>2</i></sup>) values of all models were greater than 0.99. The optimal conditions were a LCCMs composition of 60% CGCS, 30% GGBS, and 10% MSWI FA, water glass modulus of 1.14, and alkali equivalent of 7.98%, which yielded a 28-d UCS of 26.85&#xa0;MPa. The LCCMs polymerization products were mainly C-A-S-H gel. The C-A-S-H gel gradually changed from an oligomeric state to a hyperpolymeric state with the increasing curing age and finally formed a dense gel matrix structure. The leaching concentrations of various heavy metals in LCCMs met standard limits. These findings offer technical support for the utilization of CGCS and MSWI FA resources.</p>

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Mechanical properties and micromorphology of coal gasification coarse slag based cementitious materials and mechanism of heavy metal solidification

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Lijuan Su,
  • Bo Liang,
  • Xiangdong Zhang,
  • Bing Liang

摘要

In this study, a novel ternary low-carbon cementitious materials (LCCMs) was prepared by using modified CGCS (Coal Gasification Coarse Slag), ground granulated blast-furnace slag (GGBS), and municipal solid waste incineration fly ash (MSWI FA) as precursors and water glass and sodium hydroxide as alkaline exciters. The effects of CGCS dosage, water glass modulus, and alkali equivalent on the fluidity, setting time, and uniaxial compressive strength (UCS) of the LCCMs were systematically studied using response surface methodology with a Box-Behnken Design (BBD). The optimal ratio was determined by regression. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis/differential thermal analysis (TGA/DTA), and inductively coupled plasma-mass spectrometry (ICP-MS) revealed the strength formation mechanism of LCCMs and the heavy metals solidification mechanism. The results showed that each factor had a significant effect on the response variables, and the interactions of some factors had a significant effect. The regression coefficients (R2) values of all models were greater than 0.99. The optimal conditions were a LCCMs composition of 60% CGCS, 30% GGBS, and 10% MSWI FA, water glass modulus of 1.14, and alkali equivalent of 7.98%, which yielded a 28-d UCS of 26.85 MPa. The LCCMs polymerization products were mainly C-A-S-H gel. The C-A-S-H gel gradually changed from an oligomeric state to a hyperpolymeric state with the increasing curing age and finally formed a dense gel matrix structure. The leaching concentrations of various heavy metals in LCCMs met standard limits. These findings offer technical support for the utilization of CGCS and MSWI FA resources.