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Study on the Rheological Properties and Microstructural Evolution Mechanism of Multicomponent Solid Waste

Jiqi Cai1, Chuang Sun1, Jianjun Zhang1

  • 1School of Civil Engineering, Liaoning Technical University, Fuxin 123000, China.

Materials (Basel, Switzerland)
|March 14, 2026
PubMed
Summary
This summary is machine-generated.

This study optimizes solid waste filling slurry using iron tailings, slag, steel slag, and desulfurization ash. The best mix achieved 5.90 MPa strength and improved rheological properties, offering a 65% cost reduction.

Keywords:
Bingham modelfully solid waste backfill slurryresponse surfacerheological propertiesyield stress

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Area of Science:

  • Materials Science
  • Geotechnical Engineering
  • Waste Management

Background:

  • Traditional cement-based slurries pose environmental and cost challenges.
  • Utilizing solid waste in filling slurries is crucial for sustainable construction.
  • Iron tailings and industrial by-products offer potential as alternative construction materials.

Purpose of the Study:

  • To enhance the rheological properties and engineering applicability of fully solid waste filling slurry.
  • To investigate the synergistic effects of steel slag and desulfurization ash on slurry performance.
  • To develop a cost-effective and sustainable alternative to cement-based slurries.

Main Methods:

  • Central composite design experiment to optimize steel slag (10-30%) and desulfurization ash (10-30%) content.
  • Rheological property measurement using expansion tests and L-tube models (Bingham fluid model).
  • Micro-mechanistic analysis including isothermal calorimetry and microscopic image processing.

Main Results:

  • Optimal mix (20% steel slag, 20% desulfurization ash) achieved 5.90 MPa uniaxial compressive strength at 28 days.
  • Yield stress and plastic viscosity optimized to 146.71 Pa and 3.04 Pa·s, respectively.
  • Desulfurization ash reduced yield stress by 38% and increased fractal dimension to 1.906; steel slag enhanced stability and regulated hydration.

Conclusions:

  • The optimized solid waste filling slurry demonstrates excellent rheological and mechanical properties.
  • Synergistic use of steel slag and desulfurization ash effectively modifies slurry performance.
  • This approach offers significant cost savings (up to 65%) and environmental benefits compared to cement-based systems.