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Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

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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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The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
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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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Concrete is a vital construction material extensively used worldwide, primarily valued for its strength, durability, and versatility, which it provides for various structural designs. Concrete generally comprises ingredients like Portland cement, coarse gravel, fine sand, and water. Concrete can be mixed by simple hand methods or industrially at computer-controlled plants. The mixture consists of aggregates and a paste made from water and Portland cement. This paste coats the aggregates and,...
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Injection 3D Concrete Printing (I3DCP): Basic Principles and Case Studies.

Norman Hack1, Inka Dressler2, Leon Brohmann1

  • 1Institute of Structural Design, Technische Universität Braunschweig, Pockelsstr. 4, 38104 Braunschweig, Germany.

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Summary

Injection 3D Concrete Printing (I3DCP) enables complex structures by injecting materials, unlike traditional layered methods. This novel approach offers technological and economic feasibility for advanced construction applications.

Keywords:
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Area of Science:

  • Construction Engineering
  • Materials Science
  • Additive Manufacturing

Background:

  • Current 3D concrete printing primarily relies on layered deposition methods like material extrusion, particle-bed binding, and material jetting.
  • These conventional techniques are constrained by gravitational forces, limiting the complexity of printable structures.

Purpose of the Study:

  • To introduce and evaluate a novel 3D concrete printing technology: Injection 3D Concrete Printing (I3DCP).
  • To explore the potential of I3DCP in creating intricate concrete structures free from gravitational constraints.
  • To assess the technological and economic feasibility of I3DCP for construction applications.

Main Methods:

  • Investigated three versions of I3DCP: injecting fine grain concrete into suspension, suspension into concrete, and concrete into concrete.
  • Developed and validated various material combinations through an interdisciplinary research approach and physical experiments.
  • Fabricated functional prototypes and developed architectural applications for each I3DCP version.

Main Results:

  • Demonstrated the ability to print spatially free trajectories, unconstrained by gravity.
  • Confirmed the technological feasibility of I3DCP through material development and experimental validation.
  • Validated the economic feasibility of the I3DCP process via prototype fabrication and application development.

Conclusions:

  • I3DCP technology challenges conventional 3D concrete printing principles by enabling non-layered deposition.
  • The developed I3DCP methods show significant potential for creating complex architectural designs.
  • Initial results confirm the technological and economic viability of I3DCP, paving the way for broader applications.