United States Department of Transportation
i
Development of Mix Designs for RAP Concrete for Florida Concrete Test Road
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2017-12-01
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[PDF-5.52 MB]
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TRIS Online Accession Number:01663397
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Edition:Final Report
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Abstract:The main objective of this study was to develop mix designs for concrete incorporating Reclaimed Asphalt Pavement (RAP) materials to be used in the Florida Concrete Test Road. Two different FDOT-approved RAP sources were selected and used in this study. Concrete mixtures with 0% to 40% RAP as aggregate replacement, using 0% and 20% fly ash as cement replacement, were designed using optimized aggregate gradation technique. A computer software named OAG Tool for optimizing aggregate gradation in a concrete mix design was developed and used in designing concrete mixes containing RAP. The designed concrete mixes were produced and tested in the laboratory. Critical stress analysis was performed to evaluate the potential performance of a typical concrete pavement in Florida if RAP concretes with the determined properties were used. A cost analysis was also performed to determine the possible saving if RAP materials were used as partial replacement of aggregate in pavement concrete in Florida. It was demonstrated that the OAG procedure is superior to the ACI procedure in proportioning aggregates to achieve a well-graded aggregate blend and a workable mix. The control mix containing no RAP had a gap-graded aggregate which lacked intermediate-size particles. When 20% or 40% RPA materials were incorporated using the OAG procedure, the aggregate blend became significantly more well-graded and the concrete became more workable. The results of critical stress analysis indicate that the RAP concrete using 20% fly ash and 20% to 40% RAP with a w/c ratio of 0.50 could have better potential performance than a concrete mix with 0% RAP and using pure cement and the same water-to-cement (w/c). A cost analysis on the replacement of aggregate with RAP indicates that using 20% and 40% RAP in concrete could result in saving in the total cost of aggregate by 10% and 19%, respectively. Four concrete mix designs of concrete incorporating RAP are recommended as feasible mixes to be used in the Florida Concrete Test Road. It is recommended that 20% of RAP can be used as aggregate replacement in pavement concrete.
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