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RETRACTED: Utilization of solid mine waste in the building materials for 3D printing.

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This study introduces eco-friendly 3D concrete printing using limestone powder as a sand substitute. A 40% replacement optimizes printability and enhances mechanical properties by 45%.

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Area of Science:

  • Construction Materials Science
  • Sustainable Architecture
  • Additive Manufacturing

Background:

  • 3D printing in architecture offers a green revolution, but solid waste utilization impacts concrete properties.
  • There's a need for alternative materials to enhance 3D printable concrete performance and cost-effectiveness.

Purpose of the Study:

  • To investigate fine limestone powders as a sustainable replacement for natural sand in 3D concrete printing.
  • To determine the optimal limestone powder content for improved printability, buildability, and mechanical strength.
  • To evaluate the impact of limestone powder on concrete's microstructure, flowability, shrinkability, and bonding.

Main Methods:

  • Experimental characterization of concrete properties including microstructures, flowability, buildability, shrinkability, and mechanical strength.
  • Development of a method to characterize printable properties and determine optimal replacement ratios.
  • Analysis of layer-interface and interlayer bonding strength in 3D printed concrete specimens.

Main Results:

  • A 40% limestone powder substitution optimized concrete grading, enhancing printability and buildability.
  • Microstructures became denser, leading to a 45% improvement in mechanical properties.
  • Higher replacement ratios reduced flowability, increased shrinkage, and trapped air, negatively impacting mechanical properties.

Conclusions:

  • Fine limestone powder is a viable eco-friendly material for 3D concrete printing, improving sustainability and resource utilization.
  • Optimized limestone powder content enhances concrete's printability and mechanical performance.
  • This approach promotes sustainable development in the construction sector through effective solid waste management.