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BED32-977-1 NEXTGEN Concrete – Tests of the Future: Chloride Diffusion

File Language:
English


Details

  • Creators:
  • Corporate Creators:
    Embry-Riddle Aeronautical University. Department of Civil Engineering
  • Corporate Contributors:
    Florida. Department of Transportation
  • Subject/TRT Terms:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Edition:
    Final Report: 8/2022-3/2026
  • Corporate Publisher:
    Florida. Department of Transportation
  • Abstract:
    FDOT is seeking to maximize the durability of newly constructed structural elements. As part of this goal, FDOT needs to do a better job assessing concrete mixes for specific structural applications. This assessment needs to adapt to the ever-changing physical, chemical, and market issues associated with concrete’s constituent ingredients. FDOT needs to allow the industry to use innovative new materials as well as existing materials in new combinations to optimize the performance of concrete. We need to apply to our mixes a series of screening tests that robustly assess their durability in specific FDOT applications and environments. Specifically, we need tests that measure a mix’s chloride and sulfate durability. These are key, materials-related factors that influence the durability of our new structures. In light of this, a research project, BEE02 “NEXTGEN Concrete - Tests of the Future: Chloride and Sulfate Durability,” was developed to establish thresholds for several screening test methods, including AASHTO T358 (SR), AASHTO TP119 (BR), and Modified ASTM C1202 for sulfate permeability. In addition to the test methods included in BEE02, it is also important to investigate chloride diffusion so that the SR and BR test results can be verified and validated with direct chloride diffusion results. Moreover, the chloride diffusion coefficients can be used as inputs for service life models. Thus, this project was developed as a companion project to BEE02 to investigate the chloride diffusion rates using both bulk diffusion (ASTM C1556) and rapid migration (NT Build 492) tests. Based on testing results, the target diffusion coefficients were derived based on a design service life of 75 years for different structural components. The correlations between resistivity and bulk diffusion coefficients were also established. Using this information, the thresholds were recommended for both SR and BR tests for the extremely aggressive environment.
  • Format:
    PDF
  • Funding:
    BED32-977-1
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:f45788344c25c009e91c43e4485b3697145f8f5143ad03dec91b32248bee61799b41e82640eb4c8934b87f360721a570ce84a850af7fde8c7f597c02007b3098
  • Download URL:
  • File Type:
    Filetype[PDF - 6.33 MB ]
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