Phase 4 — Supporting / Extension Layer Roadmap

Book anchor: Victor C. Li, Engineered Cementitious Composites (ECC), Springer 2019, DOI 10.1007/978-3-662-58438-5. Every Atlas node in 02_concepts/, 04_material_systems/, and 05_experiments/ carries a book-first ## Anchor evidence section produced in the prior completion pass; Phase 4 layers non-book supporting / verification citations on top of that anchor.

Completed in this pass

1. Scanned all 87 nodes and generated 07_visualization/supporting_extension_pending_inventory.csv classifying each node into one of four action categories: - matrix_supported_now — 13-paper matrix already carries rows for this node. - already_updated — node already has concrete supporting sources (not a placeholder). - needs_chapter10_extension — Chapter 10 topics (self-healing, self-sensing, piezoresistivity, EIT, thermal adaptive / PCM, photocatalytic, multifunctional / smart infrastructure). - needs_latest_research_extension — 2019+ or otherwise outside the 13-paper support set.
2. Replaced Supporting sources: pending extension-layer verification. in five nodes with concrete supporting-source bullets sourced from 07_visualization/foundational_papers_claim_evidence_matrix.csv.
3. Preserved ## Anchor evidence and ### Primary book anchor sections everywhere; no ## Foundational evidence sections were reintroduced.
4. Produced 03_papers/chapter10_extension_paper_request_list.md covering seven Chapter 10 topics with citation clues extracted from 00_sources/victor_li_book/extracted_text/10 multi functional.txt reference list.
5. Left 06_lab_position/, 00_sources/, 03_papers/ paper cards (except the new request list), and graph CSVs untouched, as required.

Nodes updated this pass (5 of the 25-node budget)

• 02_concepts/cook_gordon_effect.md — Yang et al. 2008 improved bridging law (Cook–Gordon term).
• 02_concepts/matrix_micro_spalling.md — Yang et al. 2008 improved bridging law (matrix micro-spalling term).
• 02_concepts/surface_treatment.md — Redon et al. 2001, Li Wang Wu 2001, Li Wu Wang et al. 2002 (PVA oil coating).
• 02_concepts/two_way_debonding.md — Yang et al. 2008 improved bridging law (two-way debonding / pullout term).
• 02_concepts/fiber_dispersion.md — Li & Wang 2006, Zhou et al. 2012, Li & Li 2012, Tosun/Felekoglu et al. 2014.

All bullets are tagged with matrix status ([verified_from_full_text] or [verified_from_source_note]) and framed as supporting / verification, not primary anchor.

Nodes still book-only (need action)

• 59 nodes remain with pending extension-layer verification and no matrix support. These are enumerated in 07_visualization/supporting_extension_pending_inventory.csv with action_category = needs_latest_research_extension. They cover durability, transport, applications, sustainability, structural systems (link slab, coupling beams, dam repair, tunnel lining, etc.), constitutive modeling, and fatigue/creep/cyclic-loading experiments.
• 13 nodes are Chapter 10 topics (action_category = needs_chapter10_extension) — see below.
• 10 nodes classified as already_updated had concrete supporting sources before this pass (e.g., strain_hardening_criteria, fiber_bridging_law, flaw_design, distributed_microcracking, interface_properties, micromechanics_based_design, direct_tensile_test, crack_width_distribution, processing_rheology, pseudo_strain_hardening_index, scale_linkage).

Chapter 10 papers needed from user

Detailed list with citation clues is in 03_papers/chapter10_extension_paper_request_list.md. Summary by topic:

1. Self-healing ECC — Yang 2009 [16], Fan & Li 2015 [17], Kan et al. 2010 [18], Yıldırım et al. 2018 [20], Yang 2011 [26], Li & Herbert 2012 [12] / 2013 [33], Yildirim et al. 2015 [36], Qiu et al. 2016 [37], Li Lim Chan 1998 [9], Yildirim et al. 2015 review [13].
2. Self-sensing ECC — Lin et al. SPIE 2011 [46], Li et al. ACI 2013 [47], Lynch et al. SPIE 2009 [41].
3. Piezoresistivity — Hou & Lynch SPIE 2005 [42], Ranade et al. CCR 2014 [48].
4. EIT — Hou & Lynch 2006 [43] / 2009 [44], Saraireh et al. SHCC-4 2018 [45].
5. Thermal adaptive / PCM — Cabeza et al. 2007 [3], Alkan 2006 [4], Desai et al. 2014 [5].
6. Photocatalytic — Cassar 2004 [1], Chen & Poon 2009 [38], Hashimoto et al. 2005 [39], Zhao Yang Yang 2015 [40].
7. Multifunctional / smart infrastructure — Jonkers et al. 2010 [2], Van Tittelboom et al. 2010 [7] / 2011 [10] / 2016 [11], Suryanto et al. 2015 [34] / 2016 [19].

Latest research extension streams (2019+ recommended)

For the 59 needs_latest_research_extension nodes, likely productive extension streams include:

• Durability & transport in cracked ECC (chloride, sulfate, freeze-thaw, permeability, sorptivity, carbonation).
• Steel corrosion in ECC and ECC/RC composite systems.
• Restrained shrinkage & long-term strain capacity of aged ECC.
• Fatigue, cyclic loading, and impact behavior of ECC.
• Structural application performance: link slabs, coupling beams, bridge decks, tunnel linings, patch repair, pavement overlays.
• Sustainability, embodied carbon, LCA of ECC and Green ECC.
• Rheology/self-consolidating and sprayable ECC processing science post-2019.
• Extreme-ductility ECC / ultra-ductility ECC: lineage of studies that enhance tensile ductility or combine high strength with high ductility, anchored in 02_concepts/extreme_ductility_ecc.md and tracked via 07_visualization/extreme_ductility_research_lineage.md.

Each of these should be scoped in a Phase 5 planning pass (materials-system priority list keyed to lab research directions).

Graph regeneration steps

1. Rebuild the node inventory when new supporting bullets are added: - Re-run the Phase 4 scanner to refresh 07_visualization/supporting_extension_pending_inventory.csv.
2. If graph CSVs (nodes.csv, edges.csv) reference support edges, add extension-paper edges only after paper cards land under 03_papers/.
3. Re-run any downstream visualization scripts / Obsidian graph exports so that support edges appear as second-tier links behind the primary book anchor.
4. Regenerate 07_visualization/book_anchor_node_completion_report.md if the anchor-evidence structure ever needs to reflect the new supporting-source coverage.

User action list

1. Confirm the Chapter 10 acquisition target list in 03_papers/chapter10_extension_paper_request_list.md and start collecting PDFs (Springer, ScienceDirect, ACI, SPIE, or institutional library). 1a. Confirm the extreme-ductility acquisition list in 03_papers/extreme_ductility_extension_paper_request_list.md, starting with high-strength/high-ductility ECC papers such as Ranade et al. 2013.
2. For each acquired paper: place PDF/extracted text under 00_sources/foundational_papers/, add source note and paper card under 03_papers/, and extend the claim-evidence matrix.
3. Decide whether the 59 latest-research nodes should be batched by topic (durability, transport, applications, sustainability, structural systems) or by chapter for the next extension pass.
4. Trigger a follow-up bounded pass (target: up to 25 nodes) once new supporting cards exist.
5. Defer any lab-position edges to Phase 5 (06_lab_position/) as agreed.