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LIFE-365

LIFE-365. Service Life Prediction Model for Concrete Structures. LIFE-365. Computer Program for predicting the service life and life-cycle costs of reinforced concrete exposed to chlorides. Strategic Development Council (SDC). Formed by ACI International in 1997 Collaborative Problem Solving.

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LIFE-365

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  1. LIFE-365 Service Life Prediction Model for Concrete Structures

  2. LIFE-365 Computer Program for predicting the service life and life-cycle costs of reinforced concrete exposed to chlorides

  3. Strategic Development Council (SDC) • Formed by ACI International in 1997 • Collaborative Problem Solving

  4. SDC Mission • To form alliances of concrete industry leaders dedicated to expanding the total market potential for concrete. • To leverage the efforts and resources through consortia.

  5. SDC Consortium #26 • Service life prediction model LIFE-365

  6. Consortia Funding • Grace • MBT • PCA • SFA

  7. SLPM Phases • Phase I • Version 1.0 July 2000 • Phase II • Consensus Test Procedures 2001 • Phase III • ACI International acceptance, 5 years

  8. Walker Parking Structural Preservation Systems Cagley & Associates Caruthers & Wallace Reid Crowther AGRA CCIA FHWA AGRA NST MTO CTL NYDOT FDOT NCDOT CCIA WJE AET Virginia Tech Levelton Phase I Beta Testers

  9. Concrete Corrosion Inhibitors Association Cortec Master Builders Grace Sika Axim

  10. Phase II Testing • Corrosion Threshold Values • Chloride Diffusion Values

  11. Service Life • Construction to First Repair

  12. Figure 4.1 Two-Stage Service Life Model Proposed by Tuutti (1982) Two Stage Service Life Model • Page 32 • Figure 4.1 • Tuuti

  13. Initiation Period • Time for Chloride to penetrate to the rebar, accumulate to threshold to initiate corrosion.

  14. Initiation Period Model • Diffusion Mechanism • Fick’s Second Law • Finite Element Model • Inputs • Cover • Quality • Exposure • Threshold

  15. Propagation Period • Time necessary for sufficient corrosion to require repair

  16. Propagation Period Model • Assign a fixed value - will be modeled in the next version

  17. Input Parameter • Cs Surface concentration of chloride ion • D Diffusion coefficient • M Diffusion decay coefficient • Dult Ultimate diffusion coefficient • Ct Chloride threshold • tp Propagation period • T Temperature

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