Service life modeling for fly ash in concrete
- Boral Material Technologies Inc. (United States)
Because virtually all durability aspects of concrete are improved with a reduction in permeability, the use of fly ash improves concrete durability. Concrete water demand is typically reduced when using fly ash leading to a lower water cementitious ratio. The Life 365 model is one example of a life cycle cost prediction model. It was originally created as a industry standard model to predict ingress of chloride in structures and mitigation technologies for controlling corrosion. This model allows users to input the actual diffusion data for a given mix design. Users can also select pre-set modifications such as fly ash to produce high performance concrete, or such corrosion inhibitors as stainless steel, epoxy coated reinforcement, or application of sealers or membranes. Other more recent computer based service life models attempt to improve on some of the perceived shortcomings of Life 365. One such model, STADIUM, predicts the movement of other ions in addition to chloride, including sulfate, hydroxyl, sodium, potassium, magnesium, and others, as well as several solid phases. The transport mechanism in this model is not limited to diffusion of ions in saturated conditions. One notable feature of STADIUM is its ability to account for movement of ions, and to adjust for coupling due to changes in concentration of various ions. This model will adjust the amount of predicted ions in solution in keeping with maximum solubilities of the respective compounds. 2 figs.
- OSTI ID:
- 20790824
- Journal Information:
- Ash at Work, Journal Name: Ash at Work
- Country of Publication:
- United States
- Language:
- English
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