RES2013-41: Determining Concrete Chloride Permeability Rapidly and Effectively

A study was conducted to determine if chloride permeability could be determined more quickly and efficiently. Two mixtures were selected by the Tennessee Department of Transportation (TDOT) Materials and Tests (M&T) Division: a TDOT Class D mixture with 20% Class F fly ash and an experimental mixture containing 35% Grade 120 slag and 15% Class F fly ash. Five validation batches of each mixture were produced. The plastic and hardened properties of all validation batches of both mixtures met TDOT 604.03 Class D requirements. Subsequently, twenty batches of each mixture were produced for chloride permeability comparison. Rapid chloride permeability ((RCP) AASHTO T 277) was measured after 28 days of accelerated curing and also after 56 and 91 days of normal curing. Surface resistivity ((SR) AASHTO TP 95) was measured after 28 days of accelerated curing and also after 28, 56 and 91 days of normal curing. Additional data from other TTU studies was also used in the correlations and predictions. The correlation between SR and RCP was significantly different from the correlation based on AASHTO categories, but, on average, differed from AASHTO by less than 4%. Correlations between earlier and later age values of both SR and RCP were very strong (R2 > 0.9) for both accelerated and normal moist curing. The authors recommend that TDOT M&T: (1) Use SR instead of RCP for primarily logistical reasons. (2) Use normal curing rather than accelerated curing for primarily logistical reasons. (3) Specify minimum SR of 24 kilohm-cm after 28-days of normal curing. (4) Continue accumulating results from different Class D and experimental PCC mixtures.

Language

  • English

Project

  • Status: Completed
  • Funding: $234238
  • Contract Numbers:

    RES2013-41

  • Sponsor Organizations:

    Tennessee Department of Transportation

    James K. Polk Building
    Fifth and Deaderick Street
    Nashville, TN  United States  37243-0349
  • Managing Organizations:

    Tennessee Department of Transportation

    James K. Polk Building
    Fifth and Deaderick Street
    Nashville, TN  United States  37243-0349
  • Performing Organizations:

    Tennessee Tech University

    Department of Civil and Environmental Engineering
    1020 Stadium Drive Box.5015
    Cookeville, TN  United States  38505
  • Principal Investigators:

    Crouch, Lewis

  • Start Date: 20130801
  • Expected Completion Date: 20180731
  • Actual Completion Date: 0
  • USDOT Program: Transportation, Planning, Research, and Development

Subject/Index Terms

Filing Info

  • Accession Number: 01762882
  • Record Type: Research project
  • Source Agency: Tennessee Department of Transportation
  • Contract Numbers: RES2013-41
  • Files: RIP, STATEDOT
  • Created Date: Jan 28 2021 2:39PM