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Related Concept Videos

Curing of Concrete01:20

Curing of Concrete

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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...
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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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Adhesion01:14

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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Voltage01:13

Voltage

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The movement of electrons in a conductor requires some form of energy or work, usually provided by an external force, like a battery. This force is called the electromotive force or voltage. The voltage between two points, referred to as points "a" and "b," in an electric circuit is the energy (or work) needed to move a unit charge from point "a" to point "b," and this relationship is expressed mathematically as
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In electrical circuits, resistors can be connected in series, sequentially linked one after the other. In a series configuration, the same current flows through each resistor. Ohm's law is a fundamental principle to understand the behavior of resistors in series. It expresses the voltage across these resistors in terms of the current and resistance.
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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
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Self curing and voltage activated catechol adhesives.

Lu Gan1, Nigel C S Tan, Avi Gupta

  • 1School of Materials Science and Engineering (MSE), Division of Materials Technology, Nanyang Technological University (NTU), Singapore 639798. wjsteele@ntu.edu.sg.

Chemical Communications (Cambridge, England)
|August 6, 2019
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Summary
This summary is machine-generated.

A novel one-pot catechol adhesive offers multiple curing methods, including electrocuring. Electrocuring provides comparable adhesion strength to traditional two-part systems, advancing adhesive technology.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Traditional catechol adhesives typically require two-part curing systems.
  • This limits their application and convenience in various settings.
  • Developing single-component (one-pot) catechol adhesives is a significant challenge.

Purpose of the Study:

  • To demonstrate the first one-pot catechol adhesive with multiple external activation modes.
  • To evaluate the performance of electrocuring as a novel activation method.
  • To compare electrocuring with conventional two-part curing for catechol adhesives.

Main Methods:

  • Synthesis of a novel one-pot catechol adhesive formulation.
  • Implementation of multiple curing strategies: self-curing, electrocuring, substrate-assisted curing, and two-part curing.
  • Characterization of adhesive properties using lap shear tests and viscoelastic measurements.

Main Results:

  • The one-pot catechol adhesive successfully demonstrated multiple curing modes.
  • Electrocuring achieved a lap shear adhesion strength of 50 kPa.
  • Viscoelastic properties indicated that electrocuring is non-inferior to traditional two-part curing methods.

Conclusions:

  • A versatile one-pot catechol adhesive has been developed, overcoming limitations of existing systems.
  • Electrocuring presents a viable and effective alternative to conventional two-part curing for catechol adhesives.
  • This advancement opens new possibilities for simplified and efficient application of high-performance catechol-based adhesives.