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Related Concept Videos

Compacting Factor test01:22

Compacting Factor test

The compacting factor test is a method used to assess the workability of concrete. It is  especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
The procedure begins by placing concrete into the upper hopper without any compaction. Once filled, the bottom door of this hopper is opened,...
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Optimizing growth media enhances microbial proliferation and maximizes product yield. Statistical experimental design methodologies provide structured and reproducible approaches, offering progressively higher levels of robustness and efficiency.The One-Factor-at-a-Time (OFAT) MethodThe One-Factor-at-a-Time (OFAT) method involves adjusting a single variable while keeping all others constant. However, it cannot detect interactions between variables, often leading to suboptimal outcomes when...
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Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
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Dynamic Modulus of Elasticity of Concrete01:16

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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
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Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
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An experimental evaluation of an effective medium based compaction equation.

Foad Mahmoodi1, Göran Alderborn, Göran Frenning

  • 1Department of Pharmacy, Uppsala University, Uppsala Biomedical Center, P.O. Box 580, SE-751 23 Uppsala, Sweden. foad.mahmoodi@farmaci.uu.se

European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences
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PubMed
Summary

The effective medium (EM) equation accurately models powder compression, revealing distinct compression mechanisms. This study validates the EM equation for understanding tablet manufacturing processes.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Pharmaceutical Technology

Background:

  • Tablet production relies on powder compression within defined geometries.
  • Understanding powder compression dynamics is crucial for optimizing tablet manufacturing.
  • Existing compaction equations like Heckel and Kawakita have limitations.

Purpose of the Study:

  • To experimentally evaluate the applicability of the effective medium (EM) equation for powder compression.
  • To investigate powder compression mechanisms using the EM equation.
  • To determine the transition point between particle rearrangement and plastic deformation.

Main Methods:

  • Characterization and compression of sodium chloride and lactose monohydrate powders across three size fractions.
  • Compression to a maximum pressure of 500 MPa.
  • Analysis of compression data using the effective medium (EM) equation, varying compression starting points.

Main Results:

  • The effective medium (EM) equation demonstrated applicability to the studied powder systems.
  • Invariant regions within the EM equation were observed, correlating with the onset of plastic deformation.
  • The point at which particle rearrangement ceases was determined.

Conclusions:

  • The effective medium (EM) equation provides valuable insights into powder compression mechanisms.
  • The study identified specific conditions where plastic deformation dominates over particle rearrangement.
  • The findings contribute to a better understanding of powder behavior during tablet compression.