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相关概念视频

Thermal Insulation in Masonry Walls01:22

Thermal Insulation in Masonry Walls

141
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
141
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

102
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...
102
Hot Weather Concreting01:20

Hot Weather Concreting

83
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.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
83
Cold Weather Concreting01:27

Cold Weather Concreting

88
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...
88
Design Example: Sustainability in Concrete Building01:26

Design Example: Sustainability in Concrete Building

183
As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
183
Curing Methods01:26

Curing Methods

96
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...
96

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相关实验视频

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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
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热隔热印度

Vaishnavi Chandrashekhar1

  • 1Mumbai, India.

Science (New York, N.Y.)
|September 28, 2023
PubMed
概括

印度城市正在试点实施减热策略, 这些创新的城市规划解决方案旨在提高对极端高温事件的抵抗力.

科学领域:

  • 城市规划和气候适应战略.
  • 环境科学与公共卫生.

背景情况:

  • 全球气温上升对全球城市人口构成重大威胁.
  • 印度城市在开发和测试创新减热措施方面处于领先地位.

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