Use of Reclaimed Asphalt Pavement in Concrete Pavement Slabs: [Summary]
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Use of Reclaimed Asphalt Pavement in Concrete Pavement Slabs: [Summary]

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      This study evaluated the feasibility of using reclaimed asphalt pavement (RAP) as aggregate replacement in concrete for use in pavement. Four different RAPs from Florida Department of Transportation (FDOT) approved RAP sources were used. Concrete mixtures with 0%, 20%, 40%, 70% and 100% aggregate replacement by RAP were produced and evaluated. The compressive strength, modulus of elasticity, splitting tensile strength and flexural strength of concrete were observed to decrease as the percentage of RAP increased in the concrete mix. The reduction in flexural strength was 10% to 20% lower than the corresponding reduction in compressive strength. The percent reduction in modulus of elasticity of the concrete was much higher than the corresponding reduction in compressive strength. The failure strain and toughness of concrete increased as the percentage of RAP increased in the mix. When a finite element analysis was performed to determine the maximum stresses in a typical concrete pavement in Florida under critical temperature and load conditions, the maximum computed stresses decreased as the RAP content of the mix increased, due to decrease in the elastic modulus of the concrete. Though the flexural strength of the concrete with RAP was lower than that of the conventional concrete, the computed stress to strength ratio for some of the RAP concrete was lower than that for the conventional concrete. The results of analysis of ultimate failure loads of concrete pavement slabs show that, on average, the pavement slabs using RAP concrete have higher failure load than that of the slab using the conventional concrete. The results of this study indicate that the use of RAP as aggregate replacement in pavement concrete appears to be not only feasible but also offers the possibility of improving the performance of concrete pavement. A recommended mix design procedure for concrete containing RAP is provided. It is recommended that a concrete pavement test section using RAP concrete be constructed within an existing highway to perform field validation.
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