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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] Concrete is damaged if it does not reach a strength of 500 pounds per square inch (3.4 MPa) before freezing. [3]: 19
East Los Angeles, the Gateway Cities, and parts of the San Gabriel Valley average the warmest winter high temps (72 °F, 22 °C) in all of the western U.S., and Santa Monica averages the warmest winter lows (52 °F, 11 °C) in all of the western U.S. Palm Springs, a city in the Coachella Valley, averages high/low/mean temperatures of 75 °F/50 ...
“The air temperature might be 110 degrees, but the sidewalk temperature might be 115 or 120,” Wood said. Lighter-colored sidewalks may feel warm since they reflect the heat, but darker-colored ...
NOAA's National Climate Data Center reported that over 7,000 daily record high temperatures were tied or broken from 1 March through 27 March. [1] In some places the temperature exceeded 86 °F (30 °C). For instance, in Grand Rapids, Michigan, the highest temperature recorded was 87 °F (31 °C) on March 21; in Chicago a high of 87 °F was ...
The Santa Anas are katabatic winds (Greek for "flowing downhill") arising in higher altitudes and blowing down towards sea level. [7] The National Weather Service defines Santa Ana winds as "a weather condition [in southern California] in which strong, hot, dust-bearing winds descend to the Pacific Coast around Los Angeles from inland desert regions".
One reason why the carbon emissions are so high is because cement has to be heated to very high temperatures in order for clinker to form. A major culprit of this is alite (Ca 3 SiO 5), a mineral in concrete that cures within hours of pouring and is therefore responsible for much of its initial strength. However, alite also has to be heated to ...
About 10% to 15% of California’s wildfires are ignited by arson each year — and 2024 appears to be in line with the trend. But as climate change leads temperatures to rise, fire seasons to ...
If concrete is poured by hot weather in the summer, or that the concrete component or the structure is massive and that its internal temperature exceeds 65 °C, ettringite does not form, but only AFm. While concrete sets and hardens, it cools down back to ambient temperature.
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