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首页> 美国政府科技报告 >Use of Recycled Concrete Made with Florida Limestone Aggregate for a Base Coursein Flexible Pavement
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Use of Recycled Concrete Made with Florida Limestone Aggregate for a Base Coursein Flexible Pavement

机译：使用佛罗里达石灰石骨料制成的再生混凝土在柔性路面基础课程中的应用

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The objectives of this research study are to investigate the feasibility of usingrecycled concrete aggregate (RCA) as a base course material in asphalt pavement, to evaluate the physical properties of RCA, and to develop practical and reliable guidelines and specifications. The tasks included in this study are: literature review, a questionnaire to RCA producers, sample collection, laboratory testing, accelerated performance testing and pavement distresses monitoring, Falling Weight Deflectometer (FWD) test, theoretical analysis of pavement, and development of guidelines and specifications for the use of Florida RCA. The laboratory tests of RCA samples included: gradation, LBR, LA abrasion, soundness and sand equivalent, optimum moisture content, maximum dry unit weight, permeability, and impurities. The project also included the construction of three test sections of asphalt pavement at the University of Central Florida Circular Accelerated Test Track (UCF-CATT). Two sections of different thickness were constructed with RCA base and one section with limerock (LR) base. A total of 362, 198 load repetitions were applied to the test sections. This is equal to 811,324 of 18 kips (80 kN), equivalent single axle load (ESAL). The pavement distresses of rutting, cracking, and settlement were monitored during the course of the performance testing. Falling Weight Deflectometer (FWD) test was performed on the pavement test sections to back-calculate the in-situ resilient moduli of RCA and LR for theoretical analysis of life expectancy. The findings in this project support the hypothesis that RCA can be used effectively as a base course when appropriate quality control techniques are utilized. Based on the information obtained in this study, a set of specifications for the use of RCA as a base course in flexible pavements was developed.

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