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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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Related Experiment Video

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A Venturi Effect Can Help Cure Our Trees
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Prehabilitation is better than cure.

Simone Gurlit1, Manfred Gogol2

  • 1Department of Anesthesiology and operative Intensive Care, St. Franziskus-Hospital Muenster, Muenster.

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Prehabilitation programs aim to improve outcomes for older surgical patients by enhancing their physical and psychological health. While promising, more research is needed to confirm clinical benefits in diverse patient groups.

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Area of Science:

  • Geriatric Surgery
  • Perioperative Medicine
  • Rehabilitation Medicine

Background:

  • Increasing numbers of older adults undergo major surgery, necessitating better risk identification.
  • Prehabilitation, focusing on exercise, nutrition, and stress reduction, is gaining attention for frail patients.

Purpose of the Study:

  • To review the current literature on prehabilitation for older surgical patients.
  • To assess the evidence for prehabilitation's effectiveness in improving perioperative outcomes.

Main Methods:

  • Comprehensive literature search focusing on recent publications.
  • Analysis of studies examining prehabilitation components and their impact.

Main Results:

  • Significant increase in publications, indicating growing interest in prehabilitation.
  • Physiological benefits of prehabilitation are suggested, but robust clinical outcome data are limited, especially for octogenarians.
  • Lack of standardized definitions for frailty and prehabilitation.

Conclusions:

  • Early identification and enhancement of physiological reserve in high-risk patients show promise for improving outcomes.
  • Further high-quality studies are required to establish effectiveness in heterogeneous populations and standardize the prehabilitation concept.