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A cement accelerator is an admixture for the use in concrete, mortar, rendering or screeds. The addition of an accelerator speeds the setting time and thus cure time starts earlier. [ 1 ] This allows concrete to be placed in winter with reduced risk of frost damage. [ 2 ]
The American Concrete Institute (ACI) definition of cold weather placement, ACI 306, [128] is: A period when for more than three successive days the average daily air temperature drops below 40 °F (~ 4.5 °C), and; Temperature stays below 50 °F (10 °C) for more than one-half of any 24-hour period.
Cold Rooms for experimentation on frozen materials A Frost Effects Research Facility (FERF), devoted to the study of large-scale soil systems, like pavements. An Ice Engineering Facility (IEF), which is devoted to the study of ice effects in navigable waterways, hydrology and hydraulics problems, flooding, and other matters that may result from ...
Air entrainment in concrete is the intentional creation of tiny air bubbles in a batch by adding an air entraining agent during mixing. A form of surfactant (a surface-active substance that in the instance reduces the surface tension between water and solids) it allows bubbles of a desired size to form.
The Building 440 is an insulated, refrigerated hangar. There is an office and instrumentation building, a cold-weather engine test cell, the refrigeration system, mechanical-draft cooling towers, and a steam-heating plant. [4] The main chamber is 252 feet (77 m) wide, 201 feet (61 m) deep, and 70 feet (21 m) tall at the center of the hangar.
The culprit: a blast of cold Arctic air. The weather event kicks off meteorological winter, which starts on Dec. 1. Of course, astronomical winter begins on Dec. 21, the winter solstice.
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