Addressing safety through evaluation and optimization of permeable friction course mixtures.
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Addressing safety through evaluation and optimization of permeable friction course mixtures.

Filetype[PDF-1.24 MB]


English
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Details:

  • Creators:
  • Corporate Creators:
    Texas Transportation Institute
  • Subject/TRT Terms:
  • Publication/ Report Number:
    SWUTC/10/476660-00013-1
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Texas
  • Edition:
    Technical report; Sept. 2008-Dec. 2009.
  • Corporate Publisher:
    Southwest Region University Transportation Center (U.S.)
  • Abstract:
    Permeable friction course (PFC) mixtures are a special type of hot mix asphalt characterized by a

    high total air voids content to guarantee proper functionality and stone-on-stone contact of the coarse

    aggregate fraction to ensure adequate mixture stability. Thus, PFC mixtures constructed in a thin layer at

    the surface of a pavement structure produce several benefits in terms of economy, safety, and the

    environment. This project focused on the analysis of functionality (i.e., drainability), stone-on-stone

    contact, and mixture internal structure to propose improvements in these three aspects for PFC mix design

    and evaluation. The analysis was based on both a macroscopic assessment of mixture properties and a

    study of internal structure using X-ray Computed Tomography (X-ray CT) and image analysis techniques.

    The assessment of drainability led to a recommendation to use the expected value of permeability

    (based on a modified Kozeny-Carman equation) for analytical prediction of permeability. The wateraccessible

    AV content was also proposed as a surrogate of the total AV content for indirect assessment of

    permeability. In addition, field drainability of PFC mixtures can be evaluated in terms of the water flow

    value (outflow time). Proposed enhancements for the quantitative determination of stone-on-stone contact

    were established using the Discrete Element Method and image analysis techniques. This analysis allowed

    recommendation of: (i) a criterion to determine the breaking-sieve size (sieve size differentiating the coarse

    and fine aggregate fractions) and (ii) verification of stone-on-stone contact using a maximum voids in

    coarse aggregate (VCA) ratio of 0.9 over the current criterion (VCA=1.0). The analysis of mixture internal

    structure led to recommend reduction of the horizontal heterogeneity of total AV content by using road

    cores with a minimum 152.4 mm diameter and coring SGC specimens from 152.4 to 101.6 mm in

    diameter. In addition, limitations in comparing the vertical distribution of AV of field- and laboratorycompacted

    mixtures supported recommendation of field-compaction control and future analysis of

    m ixtures produced accordingly.

  • Format:
    PDF
  • Funding:
    DTRT07-G-0006
  • Collection(s):
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