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LIFE-365: Service Life Prediction Model for Concrete Structures

LIFE-365 is a simplistic model for predicting service life and life-cycle costs of reinforced concrete exposed to chlorides. Trace the history of LIFE-365 from its inception in 1998 at the NIST workshop to its latest version in 2008. Explore the Two-Stage Service Life Model proposed by Tuutti in 1982, detailing the initiation and propagation periods, diffusion mechanisms, and input parameters such as surface concentration of chloride ion, diffusion coefficient, and more.

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LIFE-365: Service Life Prediction Model for Concrete Structures

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

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

  3. History of LIFE 365 • 1998 - NIST workshop outlined the need for a consensus corrosion service life model. • 1999 – ACI Strategic Development Council (SDC) formed a consortium to fund LIFE 365 development. • August 2001- LIFE 365 v1 released • 2005 – second consortium formed to continue development and improvement of LIFE 365. • January 2008 LIFE 365 v2 released

  4. Service Life • Construction to First Repair

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

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

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

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

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

  10. Input Parameters • Cs Surface concentration of chloride ion • D Diffusion coefficient • M Diffusion decay coefficient • Ct Chloride threshold • tp Propagation period • T Temperature

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