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Minimizing Paste Content in Concrete Using
Name: Minimizing Paste Content in Concrete Using
File: bentz 05-16-16.pdf
Size(MB): 2.01MB
Extension: PDF
Speaker Name: Bentz, D.
Managed by: sdickens
Date Uploaded: June 21, 2016; 9:05 am
Download Count: 400
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This presentation outlines an approach to replacing not only cement powder, but effectively cement paste consisting of the cement and water, with appropriately sized limestone powder(s). Pastes, mortars, and concretes are each formulated with limestone powder replacement for a portion of their cement paste component. For these mixture modifications, the water-to-cement ratio (w/c) is maintained at or above 0.4 to provide sufficient water to react with all of the cement, so that none of this most costly component of cement-based materials goes to waste. Meanwhile, the water-to-solids ratio (w/s) is reduced to a value in the vicinity of 0.25 to 0.30 in order to maximize the limestone powder replacement level while still providing sufficient flow and rheology, by using reasonable dosages of high range water reducing admixtures. The fresh, early age, and 28 d performance properties of these high volume limestone powder (HVLP) mixtures are contrasted with a w/c=0.4 ordinary portland cement (OPC) paste, mortar, or concrete reference, respectively. In general, the properties and performance of these more sustainable mixtures are similar or even superior, suggesting that these new paradigm HVLP concretes could be readily substituted for existing conventional OPC mixtures.

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