Durability Screening · ESG

Concrete Service-Life After Repair

An indicative screening estimator: turn a few simple inputs into a rough remaining service-life range for reinforced concrete, and see how a chosen repair strategy shifts that range. Built for the UAE / GCC durability context.

Step 1

Inputs

Element type Sets default cover & exposure (editable below).

Year built Age: — yr

Concrete quality Sets default D & K.

Cover to reinforcement [mm] Pre-filled by element type. SI: depth of concrete over the steel.

Exposure class Sets default surface chloride Cs & propagation t_p.

Sulfate exposure

Sulfate-resisting cement Moves the sulfate penalty one band milder.

Advanced mode (engineer overrides)

Repair strategy (select one or more)

Patch repairFull removal of contaminated concrete — resets the chloride clock. Protective coating / membraneSurface protection — slows chloride & carbonation ingress. Corrosion inhibitorModestly extends the propagation period. Cathodic protection (ICCP / galvanic)Halts propagation while maintained. RealkalisationResets the carbonation clock. Electrochemical chloride extraction (ECE)Reduces residual chloride content. FRP strengtheningRestores capacity — adds no corrosion-control life on its own. Section enlargement / jacketingNew high-quality cover — recomputes from now.

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Estimate

Remaining service life

Before repair

—

remaining service life (range)

After selected repair(s)

—

select a repair to see the effect

Governing— Driver— Current age—

Condition over time

Serviceability (%) from construction. Each curve holds at 100 % through the initiation period, then declines linearly to 0 % (end of service life) across the propagation period. Dashed vertical line = now.

Assumptions used (full transparency)

All figures are indicative screening defaults unless you overrode them in Advanced mode.

How this works & limitations

This tool estimates time-to-corrosion-damage using the Tuutti two-phase model: service life = initiation (time for chloride or carbonation to reach the steel) + propagation (time from depassivation to unacceptable cracking/spalling).

Chloride track — Fick’s 2nd law error-function solution; initiation when chloride at the cover depth reaches the critical threshold.
Carbonation track — the √t law (depth = K·√t); initiation when the carbonation front reaches the steel.
The shorter of the two tracks governs. Sulfate is applied as a screening risk multiplier, not a calibrated clock.

Limitations: 1-D ingress, uniform cover, constant surface conditions and a single representative element are assumed. Real structures vary spatially; defects, cracking, construction quality and microclimate dominate real outcomes. Repair effects are simplified and conditional on correct design and maintenance.

Frameworks referenced by name only: Tuutti model; Fick’s 2nd law; carbonation √t law; fib Model Code for Service Life Design / fib Bulletin 34; EN 1504 (repair principles); EN ISO 12696 (cathodic protection); ISO 16204; ACI 562 / ACI 364.

Estimates are indicative and not a substitute for site-specific assessment, sampling (cover survey, chloride profiling, carbonation depth, half-cell potentials) and design.

No personal data is collected, stored or transmitted — every calculation runs locally in your browser. © Engineering Solutions Group · indicative screening tool.