Extreme-Ductility Extension Addition Report

User request

Add an extremely ductility / extreme-ductility category to the latest-research side of the ECC Research Atlas. The purpose is to collect and trace studies that improve ECC ductility and build a research genealogy.

Files created

• 02_concepts/extreme_ductility_ecc.md
• 03_papers/extreme_ductility_extension_paper_request_list.md
• 07_visualization/extreme_ductility_research_lineage.md
• 07_visualization/extreme_ductility_extension_addition_report.md

Files updated

• NEXT_STEPS.md — Phase 3 renamed to fiber, flaw, and extreme-ductility engineering.
• 07_visualization/phase4_supporting_extension_roadmap.md — added extreme-ductility as latest-research extension stream and user action item.
• index.md — added extreme_ductility_ecc.md under latest-research extension concepts.
• 07_visualization/cross_link_map.md — added an Extreme-ductility extension section.

Book-anchor principle

This category is an extension layer, not a replacement for the Victor Li 2019 book anchor. The book provides the core design logic: micromechanics, strain-hardening criteria, fiber bridging, flaw/interface/fiber dispersion control, and direct tensile validation.

Initial lineage roots

• Li & Leung 1992 — steady-state / multiple cracking theory.
• Li, Wang & Wu 2001 and Li et al. 2002 — PVA-ECC high ductility via interface tailoring.
• Wang & Li 2004 and Lu et al. 2018 — flaw distribution / artificial flaw route.
• Li & Li 2012, Zhou et al. 2012, Tosun-Felekoglu et al. 2014 — processing/fiber dispersion route.
• Ranade et al. 2013 — high-strength, high-ductility concrete citation clue; PDF needed.

User action needed

Please provide PDFs for high-strength/high-ductility or ultra-ductile ECC/SHCC/HPFRCC papers, starting with Ranade et al. 2013 if available.