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Related Concept Videos

Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

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In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
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In- and Out-Groups01:31

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People all belong to a gender, race, age, and social economic group. These groups provide a powerful source of our identity and self-esteem (Tajfel & Turner, 1979) and serve as our in-groups. An in-group is a group that we identify with or see ourselves as belonging to.
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Masonry Paving01:21

Masonry Paving

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The construction of masonry paving involves using materials such as bricks, stones, and concrete masonry units. These materials are chosen for their shape, color, strength, and resistance to abrasion and weathering. Masonry units can be installed dry on a thin layer of sand and a gravel base, or they can be embedded in mortar or asphalt on a concrete slab. For areas subjected to heavy vehicular loads, a rigid base layer of reinforced or unreinforced concrete is recommended. In contrast,...
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Frost Action on Concrete01:27

Frost Action on Concrete

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Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
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Cold Weather Concreting01:27

Cold Weather Concreting

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When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
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Hot Weather Concreting01:20

Hot Weather Concreting

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Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
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A Mobile Outside-in Technique of Transforaminal Lumbar Endoscopy for Lumbar Disc Herniations
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outside in.

David Newnham

    Nursing Standard (Royal College of Nursing (Great Britain) : 1987)
    |January 17, 2017
    PubMed
    Summary

    High blood pressure is a serious condition affecting arteries. Uncontrolled hypertension poses significant health risks and requires medical attention.

    Area of Science:

    • Cardiology
    • Vascular Health

    Background:

    • Hypertension, or high blood pressure, is a prevalent chronic condition.
    • Elevated blood pressure exerts excessive force on artery walls, increasing cardiovascular risk.

    Purpose of the Study:

    • To highlight the critical nature of elevated blood pressure.
    • To emphasize the dangers associated with untreated hypertension.

    Main Methods:

    • This abstract does not detail specific methods.
    • It focuses on the symptomatic and qualitative aspects of high blood pressure.

    Main Results:

    • The study emphasizes the immediate and concerning nature of high blood pressure.
    • It underscores that hypertension is not a trivial matter.

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    Conclusions:

    • High blood pressure is a significant health concern.
    • Prompt medical evaluation and management are crucial for individuals with hypertension.