Thermal Management in Mass Concrete
Concrete generates heat as the cementitious material hydrates. For concrete with a small volume (i.e. a high specific surface area), this heat may dissipate almost as quickly as it is generated. In the case of massive structures however, significant temperature increases occur due to generated heat of hydration. The hydration process of cement is a series of non-reversible chemical reactions between cement and water; early hydration has an influence on concrete plasticity and later hydration governs concrete strength.
Metro Testing + Engineering can provide estimations and predictions of heat generation in concrete mixes by modeling and performing laboratory mock-up tests that will determine the thermal behavior of a particular mix, allow for a dry run of the temperature monitoring system, check the fresh concrete performance, and provide a better understanding of thermal performance under more realistic conditions so a concrete temperature curve at early stages of curing can be obtained.
As different factors may cause the concrete temperature to vary from the predicted value, on site temperature monitoring and control systems can be essential. Choosing the correct temperature control system requires considerable expertise and depends on the site and ambient conditions, often require special form work modification and extended periods of curing.
- Predicting and modelling the heat of hydration in the structure
- Laboratory mock-up thermal tests
- On-site temperature monitoring
- Temperature controlling services