NDOR Material and Research
Nebraska Department of Roads
Aggregate, concrete mechanical properties, grading
This research main purpose was to optimize aggregate blends utilizing more locally available materials. With the industry collaboration and partnership, the Department embraced a change that impacts a specification implemented in the 1947 for Class of 47B concrete. This aggregate optimization embraces todayÛªs availability of new blended cements in Nebraska. These new blended cements enhanced the Alkali Silica Reaction of NebraskaÛªs sand and gravel. As well as, and not short of improving future gradation from a gap-graded to a more dense gradation. Combined aggregate gradations were evaluated for mechanical and durability characteristics for paving mix designs. The outcome of these evaluations resulted in the introduction of a new blend aggregate grading band for the Department named 47B Revised (47BR), which would allow the use of more locally available materials currently being produced in the state, thereby optimizing its economy.