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LIFE-365

LIFE-365. Service Life Prediction Model for Concrete Structures. LIFE-365. Simplistic model for predicting the service life and life-cycle costs of reinforced concrete exposed to chlorides. History of LIFE 365.

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LIFE-365

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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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