Is this related to or a continuation of a previous Iowa DOT research project?
No
Does this idea include matching funds?
No
Anticipated Benefits
With further, more marked changes in cement systems, there are questions regarding their impacts on concrete:
Set Time
Air entrainment
Bleeding
Strength gain
Modulus of elasticity
Permeability
Sulfate expansion
Calcium oxychloride resistance
Shrinkage
Many of these properties are assumed to be reasonably uniform between currently used cements, but this may no longer be true, impacting modelling, design, and construction practices.
There is a need to develop a protocol that describes what evaluation and testing should be conducted when a new product is proposed. In addition, the DOT needs to develop language on how to specify cementitious systems, and to develop guidance for designers and contractors on how to accommodate the potential changes based on the findings of test data. This work is needed to address all applications that concrete is used for including pavements, bridge decks, structural, and high-performance concrete.
Much needed! Thank you. We are seeing mix designs adjusted to include more cement to get the heat needed for curing. They are saving 10-12 percent of cement with the replacement but adding it back in to get the heat. We are also seeing very unpredictable results with set times based on temperatures and admixtures, water issues... Perhaps cement particle size needs to be a variable as well, and limestone replacement particle size due to changes in water demand.
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