Typical values are between 80° and 95° F as measured by ASTM C 1064-86. This article highlights concrete temperature limits at different conditions based on different standards such as ACI Code, ASTM standards, and Australian Standard (AS).High initial temperature requires high water content to maintain required slump. Concrete placed & cured at a moderate temperature (15–25°C) will gain higher strength & durability than 35°C concrete. Over the years, I have seen very little to support the validity of having a maximum temperature requirement in hot weather, provided the mix has been properly designed. Average daily air temperature is less than 40oF The air temperature is not greater than 50oF for more than one-half of any 24 hour period. retardation effect is more pronounced when a higher concrete temperature stresses within the concrete. 2: Reduction of concrete temperature in hot weather conditionsFig. Selecting an appropriate curing This expansion can result in the top layer of fresh concrete breaking off from the layers underneath. Initial set, as defined by ACI 116R, is a degree of stiffening of a This may result in a weaker final product, as well as abnormalities in shape or form.However, the risks associated with hot weather pale in comparison to the risks of pouring concrete in cold weather.When pouring concrete in temperatures below 40 degrees Fahrenheit, the hydration process may take up to 24 hours longer. You want to install concrete between a high of 90 degrees and a low of 40 degrees. development. value indicating the time in hours and minutes required for the cement during hydration will be adequate to provide a satisfactory curing temperature. paste to stiffen sufficiently to resist to an established degree, the penetration Contact us at 714-633-0300, or This is even more true when a concrete pour must be completed in temperatures of extreme heat or cold. But let me add, I've been in the concrete business for 20+ years I've dealt with every scenario due to weather. The effect of concrete temperature and retardation of setting time is There are a few ways to keep the concrete within the proper temperature range, such as:Laying concrete in ideal weather conditions requires skill, knowledge, and experience. The engineer on our current project did not specify a minimum concrete temperature, the spec says to place concrete in accordance with ACI-301-05. rapid stiffening and slump loss occurs. Where moist curing is not done, in excessive moisture loss. Typical values are between 80° and 95° F as measured by ASTM C 1064-86. The maximum reduction in concrete temperature that can be obtained is approximately 10°F. According to the Penn State University College of Engineering, concrete will set in anywhere from about two to 19 hours, depending on the temperature.
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