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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.
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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

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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.
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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.
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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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Outside in.

David Newnham

    Nursing Standard (Royal College of Nursing (Great Britain) : 1987)
    |January 12, 2017
    PubMed
    Summary

    Political correctness is declining. Announcing a pregnancy using traditional language was met with surprise, indicating a shift away from empathetic and inclusive communication styles in social interactions.

    Area of Science:

    • Sociolinguistics
    • Social Psychology

    Background:

    • The study examines the evolving nature of language use in social contexts.
    • It investigates contemporary attitudes towards "politically correct" expressions.

    Purpose of the Study:

    • To analyze the social reception of traditional pregnancy announcements.
    • To explore the perceived decline of empathy in modern communication.

    Main Methods:

    • Qualitative analysis of a personal anecdote.
    • Observation of social reactions to language use.

    Main Results:

    • A personal announcement of pregnancy using conventional phrasing was met with ridicule.
    • The anecdote suggests a societal trend away from "politically correct" language and empathy.

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    Conclusions:

    • The findings indicate a potential shift in social norms regarding language and empathy.
    • There is a perceived "out of fashion" status for formerly accepted expressions.