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Design Example: Sustainability in Concrete Building01:26

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As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
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Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
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Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
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Large Particle 3D Concrete Printing-A Green and Viable Solution.

Inka Mai1, Leon Brohmann2, Niklas Freund1

  • 1Institute of Building Materials, Concrete Construction and Fire Safety, Technische Universität Braunschweig, 38106 Braunschweig, Germany.

Materials (Basel, Switzerland)
|October 23, 2021
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Summary

Large Particle 3D Concrete Printing (LP3DCP) uses larger aggregates to significantly reduce cement content and environmental impact. This innovative method achieves higher compressive strengths and enables sustainable, large-scale construction applications.

Keywords:
3D concrete printingadditive manufacturing in constructionecologylarge particleslow carbonparticle bed 3D printingparticle bed bindingrecycled aggregates

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Area of Science:

  • Materials Science
  • Sustainable Construction
  • Additive Manufacturing

Background:

  • Conventional 3D concrete printing relies on fine aggregates, leading to high cement content and environmental concerns.
  • The need for sustainable and high-performance 3D printable concrete materials is critical for widespread adoption.

Purpose of the Study:

  • To introduce and investigate the Large Particle 3D Concrete Printing (LP3DCP) process.
  • To evaluate the potential of incorporating large aggregates (up to 36 mm) for reduced cement usage and enhanced material properties.

Main Methods:

  • Utilized a particle bed 3D printing approach with selective binding via shotcrete technique.
  • Conducted material investigations on particle packing, matrix penetration, and compressive strength.
  • Performed geometry studies and produced a one cubic meter demonstrator with reinforcement and subtractive processing.

Main Results:

  • Reduced cement volume fraction by over 50% compared to conventional mortar printing.
  • Achieved approximately 30% reduction in global warming potential, acidification potential, and non-renewable primary energy.
  • Attained compressive strengths up to 65 MPa due to increased aggregate proportion.

Conclusions:

  • LP3DCP offers a sustainable alternative to conventional 3D concrete printing by significantly lowering environmental impact.
  • The process enables the production of high-strength, complex structures with reduced material costs.
  • LP3DCP holds substantial potential for future construction applications and architectural designs.