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Accession Number PB2013-109675
Title Optimized Aggregates Gradations for Portland Cement Concrete Mix Designs Evaluation.
Publication Date 2013
Media Count 39p
Personal Author D. Swanson J. Beason J. Weigel L. Halsey M. Syslo R. Rea T. Gernert W. Heyen
Abstract 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 todays availability of new blended cements in Nebraska. These new blended cements enhanced the Alkali Silica Reaction of Nebraskas 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. The goal for the new 47BR Combined Aggregate Gradation is to have the contractor, with agency oversight, develop a concrete mix design with an optimum combined aggregate gradation and provide the Contractor with the testing and control responsibilities to ensure a quality product. This report presents the results of the evaluation and optimization of the 47BR Concrete Specification.
Keywords Abrasion resistance
Aggregates
Aging
Chemical reactivity
Chlorides
Compressive strength
Concrete durability
Flexural strength
Igneous rock
Length
Limestone
Mechanical tests
Performance evaluation
Permeability
Portland cement
Quality control
Stiffness
Tensile strength


 
Source Agency Federal Highway Administration
NTIS Subject Category 50A - Highway Engineering
50C - Construction Equipment, Materials, & Supplies
89G - Construction Materials, Components, & Equipment
71L - Materials Degradation & Fouling
Corporate Author Nebraska State Dept. of Roads, Lincoln.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1325
Contract Number N/A

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