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Related Concept Videos

Curing of Concrete01:20

Curing of Concrete

369
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
369
Curing Methods01:26

Curing Methods

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Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
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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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Solution Composition During Acid/Base Titrations01:17

Solution Composition During Acid/Base Titrations

1.6K
The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
The α0 and α1 values...
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Classifying Matter by Composition03:35

Classifying Matter by Composition

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Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
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Composite Bodies00:55

Composite Bodies

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A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
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Shrinkage Stress, Polymerization Kinetics, and Hardness of Light and Self-Cured Bulk-Fill Resin-Based Composites.

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Application of Light-cured Dental Adhesive Resin for Mounting Electrodes or Microdialysis Probes in Chronic Experiments
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Post-curing in dental resin-based composites.

William Germscheid1, Louis Gosse de Gorre1, Braden Sullivan2

  • 1Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada.

Dental Materials : Official Publication of the Academy of Dental Materials
|June 27, 2018
PubMed
Summary
This summary is machine-generated.

Post-curing shrinkage in resin-based composites (RBCs) significantly increases over time, influenced by filler content and initial conversion. Evaluating shrinkage beyond one hour is crucial for dental restoration longevity.

Keywords:
Degree of conversionKineticsMicrohardnessPolymerizationResin compositeShrinkageTemperature

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Resin-based composites (RBCs) are widely used in dental restorations.
  • Understanding post-curing behavior, including shrinkage and conversion, is vital for material performance.
  • Limited data exists on the long-term physical aging and shrinkage of contemporary RBCs.

Purpose of the Study:

  • To quantify post-curing axial shrinkage, degree of conversion (DC), and Vickers hardness in commercial RBCs.
  • To investigate the time and temperature dependence of these properties.
  • To correlate initial DC with long-term physical aging rates.

Main Methods:

  • Six commercial RBCs (five Bulk Fill, one conventional) were tested.
  • Axial shrinkage was measured using a bonded disk method (15-19h at 26°C and 34°C).
  • Degree of conversion (DC) was monitored using mid-infrared spectroscopy, and Vickers hardness was measured post-irradiation.

Main Results:

  • Axial shrinkage and DC showed a logarithmic time dependence, indicating physical aging towards thermal equilibrium.
  • Shrinkage-related physical aging rates varied from 1.34 to 2.00 μm/log(t), influenced by filler content.
  • Higher initial DC correlated with lower post-curing shrinkage and aging rates, with a direct correlation observed between shrinkage and DC aging rates.

Conclusions:

  • Post-curing shrinkage in dental RBCs can be substantial even 15 hours after light exposure.
  • Evaluation periods longer than 1 hour are necessary to accurately assess RBC post-curing behavior.
  • Long-term shrinkage may contribute to stress development in tooth structures, potentially impacting restoration lifespan.