It is critical to closely monitor concrete temperatures regardless of the application or size of concrete structures to ensure proper strength development. Temperature differentials must also be considered when mass concrete structures have a relatively hot interior and a cool surface temperature. Overly high temperature differentials will cause the surface of mass concrete to crack, which will affect its durability and lifespan.
Define Mass Concrete
There are no specific measurements that define mass concrete. In order to minimize cracking, large volumes of concrete are required to be able to cope with heat generation from hydration of cement and volume change associated with it. A dam, a bridge pier and column, a mat slab, or foundations are examples of mass concrete.
In addition to larger structures, smaller structures can also be categorized as mass concrete based on a number of factors. This includes cement type and quantity, concrete volume versus surface area, weather conditions, concrete place temperatures, and how thermal cracking affects performance, durability, and appearance.
Temperature Monitoring in Mass Concrete – Why It’s Important
Summer
Pouring mass concrete at a temperature between 50 to 60 �F and 10 to 16 �C will ensure it cures properly and reaches adequate strength. A low temperature slows down the chemical reactions that strengthen concrete and, eventually, stops them altogether. The concrete will have high early strengths, but subsequently lose strength in later stages if the temperature is too high, resulting in lower overall durability.
Winter
During cold weather concreting, the average daily air temperature is below 40�F or 5�C for more than half of every 24 hours for more than three successive days.
Ice and cold weather also slow down the curing process, causing concrete cracks and weakening because the water expands. It may even be impossible to use certain concretes in some cases. If the right precautions are taken to heat it properly & it can still be successfully poured and placed in winter.
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