🎓 Lesson 30
D5
High-Performance Concrete Mix Design for Marine Exposure
High-performance concrete for marine environments is a specially engineered concrete that resists saltwater, corrosion, and freeze-thaw cycles while staying strong and durable for decades.
🎯 Learning Objectives
- ✓ Calculate water-to-binder ratio and binder composition to meet chloride diffusion coefficient targets (Dₐₚₚ ≤ 3.0 × 10⁻¹² m²/s)
- ✓ Design a ternary binder system (OPC + slag + fly ash) satisfying ASTM C150/C618 requirements and achieving minimum 65% replacement while maintaining 56-day strength ≥ 45 MPa
- ✓ Analyze chloride ingress depth using Fick’s second law and predict service life per ISO 16200-2 for a given marine exposure class (e.g., XS3)
- ✓ Explain the mechanistic role of limestone filler, nanosilica, and migrating corrosion inhibitors in reducing chloride binding capacity and pore refinement
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