Study of lime vs. no lime in cold in-place recycled asphalt concrete pavements : final report.
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1991-09-01
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Alternative Title:Study of lime vs. no lime in cold in-place recycled asphalt concrete pavements.
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Abstract:The resilient characteristics of cold in-place recycled asphalt concrete with and without lime were examined. Six core samples were obtained from a site two months after construction; six months later, six additional core samples were obtained from the site. The samples were tested in the laboratory for resilient modulus. Conclusions of this study include: (1) The resilient modulus of the recycled mix with lime increased substantially in the early stage, as compared to the recycled mix without lime; (2) The resilient modulus value of the recycled mix with lime after freeze-thaw conditioning was much higher than the recycled mix without lime; and (3) Eight months after construction, the resilient modulus of the unconditioned recycled mix with lime was similar to that of the unconditioned recycled mix without lime. Recommendations of this study include: (1) Further evaluate the potential benefit of adding lime to the recycled mix and investigate the effects of adding different percentages of lime to the recycled mix; (2) Evaluate the effects of adding quick lime compared to hydrated lime to the recycled mix; and (3) Appropriate mix design criteria, construction procedures, and field control guidelines should be developed if adding lime to the recycled mix.
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