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Benchmarking Study of TDOT D Mixtures for Balanced Mix Design

File Language:
English


Filetype[PDF - 14.71 MB ]

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  • Creators:
  • Corporate Creators:
    University of Tennessee, Knoxville. Department of Civil and Environmental Engineering
  • Corporate Contributors:
  • Subject/TRT Terms:
  • Publication/ Report Number:
    RES2024-07
  • Resource Type:
    Tech Report
  • Geographical Coverage:
  • Edition:
    Final report, August 1,2023-July 31,2026
  • Corporate Publisher:
    Tennessee. Department of Transportation
  • Abstract:
    This study supported the Tennessee Department of Transportation's implementation of Balanced Mix Design (BMD) for TDOT 411-D dense-graded surface mixtures by developing local benchmarking data, evaluating aging procedures, comparing 6-inch Superpave gyratory-compacted and 4-inch Marshall-compacted specimens, and recommending preliminary performance thresholds. Twenty-four approved Tennessee mixtures were evaluated as plant-mixed, laboratory-compacted (PMLC) and laboratory-mixed, laboratory-compacted (LMLC) specimens using the IDEAL-CT, Tennessee Cracking Test (TN-CT), IDEAL-RT, high-temperature indirect tensile strength (HT-IDT), and Hamburg Wheel Tracking Test (HWTT). Five long-term aging protocols were assessed for aging severity and practical feasibility. Loose-mixture aging at 115°C for 20 hours was recommended because it successfully simulated long term aging effects while avoiding excessive conditioning time and overly high aging temperature and could be completed within a routine laboratory work schedule. An equivalent-aging-time framework was developed to integrate aging temperature and duration into a single aging severity parameter. Benchmarking results showed different performance distributions for PMLC and LMLC specimens, indicating that separate thresholds should be established for mixture design and production quality control. TN-CT correlated reasonably with IDEAL-CT, indicating that TN-CT can be used as a Marshall-compatible cracking evaluation test. In contrast, correlations among the results obtained using different rutting test protocols were relatively weak. Therefore, HT-IDT may serve as a Marshall-compatible rutting test but is not recommended as a replacement for HWTT at this stage. Preliminary thresholds were proposed for TDOT BMD implementation and should be refined as BMD implementation progresses and additional field performance data become available for verification.
  • Format:
    PDF
  • Funding:
    RES2024-07
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:eabee9a6a91b0ab3b5e5751e9bf7f0fbd5db51cf95d06382af165cecd87f2b45e9a4bb859bb13a71ae885f0329d74daec4f45819902ee30b08a1a6ecbf466a1d
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  • File Type:
    Filetype[PDF - 14.71 MB ]
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