United States Department of Transportation
i
Phase I: Evaluation of Low Flexural Strength for Northern Nevada Concrete Paving Mixtures
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2017-07-01
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[PDF-2.07 MB]
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TRIS Online Accession Number:01652281
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Abstract:Production paving grade concrete in Northern Nevada having acceptable strength is universally acknowledged to be difficult; however understanding why this is true remains elusive. Current practice is to meet flexural strength requirements by using mixtures with high cementitious materials contents and low water/cement ratios (w/cm), which can negatively impact cost, workability, shrinkage, and durability. There are multiple factors that can contribute to poor concrete strength. Most focus on the characteristics of the interface that develops between the hydrated cement paste and the aggregate which can be compromised by localized high w/cm, the presence of coatings, and/or clustering of air bubbles at the aggregate surface. An experimental plan has been developed for Phase II of this study to evaluate the factors contributing to poor flexural strength of paving grade concrete produced in Northern Nevada with the purpose of developing cost effective solutions to improve the situation.
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