Lab-to-Global ECC/EGC Lineage Map

Status

• Purpose: place Professor Bang Yeon Lee’s publication corpus on the global ECC/EGC lineage while preserving the Atlas evidence hierarchy.
• Source hierarchy: Victor Li book = primary anchor; foundational papers = supporting layer; extension papers = topic-specific layer; Lee lab papers = lab positioning layer.
• Input lab papers: 45 records in 06_lab_position/by_lee_publication_mapping.csv.
• Edge file: 07_visualization/lab_to_global_lineage_edges.csv (107 edges).

1. Global anchor: Victor Li micromechanics

Victor Li 2019 book
  -> micromechanics-based design
    -> strength criterion + energy criterion
      -> fiber bridging law / interface tailoring / flaw design / fiber dispersion
        -> distributed multiple cracking
          -> crack-width control
            -> durability / sustainability / resilience / applications

The Lee lab positioning should be read as an extension of this hierarchy rather than a replacement for it. The lab repeatedly tests whether the ECC design logic can survive difficult material constraints: cementless binders, recycled fibers, low density, hybrid fibers, and self-healing durability demands.

2. Foundational mechanism layer

3. Lee lab research axes on the global lineage

1. cementless / alkali-activated / geopolymer ECC

Strategic positioning sentence: Lee lab extends ECC micromechanics from Portland-cement composites into cementless alkali-activated and geopolymer binders while preserving strain-hardening and crack control.

Representative Lee lab publications: - 2012 — Strain hardening fiber reinforced alkali-activated mortar – A feasibility study (lee_2012_strain_hardening_fiber_reinforced_alkali_activated): First cementless/AAS strain-hardening proof-of-concept, connecting Li micromechanics to Green ECC. Source: 00_sources/by_lee_lab_publications/source_notes/lee-2012-strain-hardening-fiber-reinforced-alkali-activated_source_note.md - 2016 — Composite properties of high-strength polyethylene fiber-reinforced cement and cementless composites (choi_2016_composite_properties_of_high_strength_polyethylene): Direct cement vs AAS PE-fiber comparison showing AAS can improve tensile ductility and crack refinement. Source: 00_sources/by_lee_lab_publications/source_notes/choi-2016-composite-properties-of-high-strength-polyethylene_source_note.md - 2021 — Ultra-ductile behavior of fly ash-based engineered geopolymer composites with a tensile strain capacity up to 13.7% (nguyen_2021_ultra_ductile_behavior_of_fly_ash_based): Fly ash-based EGC extension showing ultra-ductile cement-free behavior. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2021-ultra-ductile-behavior-of-fly-ash-based_source_note.md - 2023 — Extremely-ductile alkali-activated slag-based composite with a tensile strain capacity up to 22% (luong_2023_extremely_ductile_alkali_activated_slag_based_composite_with): AAS extreme-ductility branch with very high tensile strain capacity. Source: 00_sources/by_lee_lab_publications/source_notes/luong-2023-extremely-ductile-alkali-activated-slag-based-composite-with_source_note.md - 2023 — Mechanical and autogenous healing properties of high-strength and ultra-ductility engineered geopolymer composites reinforced by PE-PVA hybrid fibers (nguyen_2023_mechanical_and_autogenous_healing_properties): High-strength/ultra-ductility EGC with PE-PVA hybrid fibers and healing relevance. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2023-mechanical-and-autogenous-healing-properties_source_note.md - 2026 — Ice-cooled ultra-high performance engineered geopolymer composites for ambient temperature curing: Formulation, properties, and microscale investigation (nguyen_2026_ice_cooled_ultra_high_performance_engineered_geopolymer): Ambient-curing high-performance EGC formulation route. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2026-ice-cooled-ultra-high-performance-engineered-geopolymer_source_note.md

Global Atlas connection: - [[green_ecc]] — 04_material_systems/green_ecc.md - [[geopolymer_ecc]] — 04_material_systems/geopolymer_ecc.md - [[cementless_composites]] — 04_material_systems/cementless_composites.md - [[sustainability]] — 02_concepts/sustainability.md

2. extreme ductility / low-density / flaw-tailored EGC

Strategic positioning sentence: Lee lab treats matrix density, rubber/EPS flaws, and activator/mineralogy control as design variables for extreme ductility rather than relying only on higher fiber volume.

Representative Lee lab publications: - 2021 — Effects of crumb rubber particles on mechanical properties and sustainability of ultra-high-ductile slag-based composites (luong_2021_effects_of_crumb_rubber_particles): Crumb rubber used to tune matrix properties and sustainability of ultra-ductile slag composites. Source: 00_sources/by_lee_lab_publications/source_notes/luong-2021-effects-of-crumb-rubber-particles_source_note.md - 2021 — Ultra-ductile behavior of fly ash-based engineered geopolymer composites with a tensile strain capacity up to 13.7% (nguyen_2021_ultra_ductile_behavior_of_fly_ash_based): Low-density fly ash EGC route to ultra-ductility. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2021-ultra-ductile-behavior-of-fly-ash-based_source_note.md - 2023 — Micromechanical and mineralogy analyses on extremely ductile engineered geopolymer composites with different activator pretreatments (nguyen_2023_micromechanical_and_mineralogy_analyses_on): Activator pretreatment/mineralogy route for extremely ductile EGC. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2023-micromechanical-and-mineralogy-analyses-on_source_note.md - 2023 — Optimization of fly ash-based polyethylene fiber-reinforced engineered cement-free composites with low-density and ultra-ductility using Taguchi robust design method (nguyen_2023_optimization_of_fly_ash_based_polyethylene): Taguchi robust design route for low-density ultra-ductile cement-free composites. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2023-optimization-of-fly-ash-based-polyethylene_source_note.md - 2025 — Achieving ultra-ductility exceeding 13 % and cost efficiency with rubberized alkali-activated slag-based cement-free composites (luong_2025_achieving_ultra_ductility_exceeding_13): Rubberized cost-efficient AAS route exceeding rebar-level ductility. Source: 00_sources/by_lee_lab_publications/source_notes/luong-2025-achieving-ultra-ductility-exceeding-13_source_note.md - 2026 — Combined effect of hybrid PE-PBO fiber reinforcement on the mechanical properties of lightweight fly ash-slag-based engineered geopolymer composites at ambient temperature and after exposure to elevated temperatures (nguyen_2026_combined_effect_of_hybrid_pe_pbo): EPS/flaw-tailored lightweight PE-PBO EGC and temperature-resistant hybridization. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2026-combined-effect-of-hybrid-pe-pbo_source_note.md

Global Atlas connection: - [[extreme_ductility_ecc]] — 02_concepts/extreme_ductility_ecc.md - [[flaw_design]] — 02_concepts/flaw_design.md - [[flaw_design]] — 02_concepts/flaw_design.md - [[lightweight_ecc]] — 04_material_systems/lightweight_ecc.md

3. recycled selvage fiber ECC

Strategic positioning sentence: Lee lab converts high-performance textile waste into structural reinforcement, linking circular-economy materials to verified tensile ductility and crack-width control.

Representative Lee lab publications: - 2022 — Highly ductile behavior and sustainability of engineered cementitious composites reinforced by PE based selvage fibers (choi_2022_highly_ductile_behavior_and_sustainability): Upcycled PE selvage fibers as full replacement for virgin PE with high ductility and cost reduction. Source: 00_sources/by_lee_lab_publications/source_notes/choi-2022-highly-ductile-behavior-and-sustainability_source_note.md - 2023 — Cementless ultra-ductile composites reinforced by polyethylene-based short selvedge fibers for sustainable and resilient infrastructure (park_2023_cementless_ultra_ductile_composites_reinforced_by): Cementless selvedge fiber composites combining recycled fibers and alkali-activated binders. Source: 00_sources/by_lee_lab_publications/source_notes/park-2023-cementless-ultra-ductile-composites-reinforced-by_source_note.md - 2024 — Crack-healing of cost-effective engineered cementitious composites reinforced by recycled selvage fiber (nguyen_2024_crack_healing_of_cost_effective_engineered_cementitious): Recycled selvage fiber ECC linked to high strength, ductility, and crack healing. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2024-crack-healing-of-cost-effective-engineered-cementitious_source_note.md - 2025 — From textile waste to high-performance composites: investigating the role of selvage fibers in engineered cementitious composites (hwang_2025_from_textile_waste_to_high_performance): Textile-waste-to-high-performance composite route with interface/pullout evidence. Source: 00_sources/by_lee_lab_publications/source_notes/hwang-2025-from-textile-waste-to-high-performance_source_note.md - 2025 — Length effects of PE-based selvage fibers on fresh, fiber dispersion, and tensile properties of engineered cementitious composites (park_2025_length_effects_of_pe_based_selvage): Fiber-length/dispersion optimization for PE-based selvage ECC. Source: 00_sources/by_lee_lab_publications/source_notes/park-2025-length-effects-of-pe-based-selvage_source_note.md - 2025 — Achieving ultra-ductility exceeding 13 % and cost efficiency with rubberized alkali-activated slag-based cement-free composites (luong_2025_achieving_ultra_ductility_exceeding_13): Recycled selvage PE in cost-efficient rubberized AAS composites. Source: 00_sources/by_lee_lab_publications/source_notes/luong-2025-achieving-ultra-ductility-exceeding-13_source_note.md

Global Atlas connection: - [[green_ecc]] — 04_material_systems/green_ecc.md - [[fiber_dispersion]] — 02_concepts/fiber_dispersion.md - [[crack_width_distribution]] — 05_experiments/crack_width_distribution.md - [[sustainability]] — 02_concepts/sustainability.md

4. self-healing and crack recovery

Strategic positioning sentence: Lee lab connects ECC crack-width control and fiber bridging to functional recovery metrics such as permeability reduction, stiffness/tensile recovery, chloride diffusion, and corrosion delay.

Representative Lee lab publications: - 2018 — Self-healing properties of cement-based and alkali-activated slag-based fiber-reinforced composites (nguyen_2018_self_healing_properties_of_cement_based_and): Cement vs AAS fiber-reinforced composites self-healing comparison. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2018-self-healing-properties-of-cement-based-and_source_note.md - 2019 — Effects of the type of activator on the self-healing ability of fiber-reinforced alkali-activated slag-based composites at an early age (nguyen_2019_effects_of_the_type_of): Activator-type influence on early-age self-healing in AAS composites. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2019-effects-of-the-type-of_source_note.md - 2019 — Mechanical properties and self-healing capacity of eco-friendly ultra-high ductile fiber-reinforced slag-based composites (nguyen_2019_mechanical_properties_and_self_healing_capacity): Eco-friendly ultra-high-ductile slag-based composites with self-healing capacity. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2019-mechanical-properties-and-self-healing-capacity_source_note.md - 2020 — Autogenous healing of high strength engineered cementitious composites (ECC) using calcium-containing binders (nguyen_2020_autogenous_healing_of_high_strength): High-strength ECC autogenous healing using calcium-containing binders. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2020-autogenous-healing-of-high-strength_source_note.md - 2021 — Effects of fiber hybridization on mechanical properties and autogenous healing of alkali-activated slag-based composites (choi_2021_effects_of_fiber_hybridization_on): Fiber hybridization linked to mechanical properties and autogenous healing. Source: 00_sources/by_lee_lab_publications/source_notes/choi-2021-effects-of-fiber-hybridization-on_source_note.md - 2023 — On crack healing in fiber-reinforced cementitious composites incorporating mineral-based healing agent and superabsorbent polymer: Evaluation using modified permeability test method (alemu_2023_on_crack_healing_in_fiber_reinforced): Modified permeability evaluation showing fiber-reinforced ECC healing behavior. Source: 00_sources/by_lee_lab_publications/source_notes/alemu-2023-on-crack-healing-in-fiber-reinforced_source_note.md - 2025 — Effect of self-healing of cracks in chloride ion diffusion and corrosion of engineered cementitious composites (alemu_2025_effect_of_self_healing_of_cracks): Healing linked to chloride diffusion and corrosion performance. Source: 00_sources/by_lee_lab_publications/source_notes/alemu-2025-effect-of-self-healing-of-cracks_source_note.md

Global Atlas connection: - [[self_healing_mechanisms]] — 02_concepts/self_healing_mechanisms.md - [[self_healing]] — 04_material_systems/self_healing_ecc.md - [[permeability]] — 02_concepts/permeability.md - [[crack_width_distribution]] — 05_experiments/crack_width_distribution.md

5. fiber/interface/micromechanics

Strategic positioning sentence: Lee lab contributes design tools and tests that connect fiber distribution, interface pullout/bridging, and composite tensile response.

Representative Lee lab publications: - 2009 — Quantitative evaluation technique of Polyvinyl Alcohol (PVA) fiber dispersion in engineered cementitious composites (lee_2009_quantitative_evaluation_technique_of_polyvinyl): Quantitative PVA fiber dispersion evaluation method. Source: 00_sources/by_lee_lab_publications/source_notes/lee-2009-quantitative-evaluation-technique-of-polyvinyl_source_note.md - 2010 — Micromechanics-Based Fiber-Bridging Analysis of Strain-Hardening Cementitious Composite Accounting for Fiber Distribution (lee_2010_micromechanics_based_fiber_bridging_analysis_of_strain_hardening): Fiber bridging analysis accounting for fiber distribution. Source: 00_sources/by_lee_lab_publications/source_notes/lee-2010-micromechanics-based-fiber-bridging-analysis-of-strain-hardening_source_note.md - 2010 — Prediction of ECC tensile stress-strain curves based on modified fiber bridging relations considering fiber distribution characteristics (lee_2010_prediction_of_ecc_tensile_stress_strain): Prediction of ECC tensile stress-strain curves from modified bridging relations. Source: 00_sources/by_lee_lab_publications/source_notes/lee-2010-prediction-of-ecc-tensile-stress-strain_source_note.md - 2015 — Bonding Properties of Basalt Fiber and Strength Reduction According to Fiber Orientation (choi_2015_bonding_properties_of_basalt_fiber): Fiber orientation/bonding effects in basalt fiber systems. Source: 00_sources/by_lee_lab_publications/source_notes/choi-2015-bonding-properties-of-basalt-fiber_source_note.md - 2020 — Mechanical and Fiber-Bridging Behavior of Slag-Based Composite with High Tensile Ductility (choi_2020_mechanical_and_fiber_bridging_behavior_of): Slag-based high-ductility composite with fiber-bridging behavior evidence. Source: 00_sources/by_lee_lab_publications/source_notes/choi-2020-mechanical-and-fiber-bridging-behavior-of_source_note.md - 2021 — Composite properties of calcium-based alkali-activated slag composites reinforced by different types of polyethylene fibers and micromechanical analysis (choi_2021_composite_properties_of_calcium_based_alkali_activated): PE fiber type and micromechanical analysis in calcium-based AAS composites. Source: 00_sources/by_lee_lab_publications/source_notes/choi-2021-composite-properties-of-calcium-based-alkali-activated_source_note.md - 2026 — Combined effect of hybrid PE-PBO fiber reinforcement on the mechanical properties of lightweight fly ash-slag-based engineered geopolymer composites at ambient temperature and after exposure to elevated temperatures (nguyen_2026_combined_effect_of_hybrid_pe_pbo): PE-PBO hybridization balances ductility and elevated-temperature residual capacity. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2026-combined-effect-of-hybrid-pe-pbo_source_note.md

Global Atlas connection: - [[fiber_bridging_law]] — 02_concepts/fiber_bridging_law.md - [[interface_properties]] — 02_concepts/interface_properties.md - [[fiber_dispersion]] — 02_concepts/fiber_dispersion.md - [[single_fiber_pullout]] — 05_experiments/single_fiber_pullout.md

6. structural / thermal / impact performance

Strategic positioning sentence: Lee lab translates ductile composites into application-facing performance spaces such as impact, layered panels, flexure, and elevated-temperature residual response.

Representative Lee lab publications: - 2012 — Flexural performance and fiber distribution of an extruded DFRCC panel (lee_2012_flexural_performance_and_fiber_distribution): Extruded DFRCC panel flexural performance and fiber distribution. Source: 00_sources/by_lee_lab_publications/source_notes/lee-2012-flexural-performance-and-fiber-distribution_source_note.md - 2016 — Hybrid effects of steel fiber and microfiber on the tensile behavior of ultra-high performance concrete (kang_2016_hybrid_effects_of_steel_fiber): Hybrid steel/microfiber tensile behavior of UHPC. Source: 00_sources/by_lee_lab_publications/source_notes/kang-2016-hybrid-effects-of-steel-fiber_source_note.md - 2016 — Control of Tensile Behavior of Ultra-High Performance Concrete Through Artificial Flaws and Fiber Hybridization (kang_2016_control_of_tensile_behavior_of): Artificial flaws and hybridization to control UHPC tensile behavior. Source: 00_sources/by_lee_lab_publications/source_notes/kang-2016-control-of-tensile-behavior-of_source_note.md - 2018 — Response of UHPFRC and HDFRC under static and high-velocity projectile impact loads (kim_2018_response_of_uhpfrc_and_hdfrc): Static and high-velocity projectile impact performance of UHPFRC/HDFRC. Source: 00_sources/by_lee_lab_publications/source_notes/kim-2018-response-of-uhpfrc-and-hdfrc_source_note.md - 2022 — Resistance of hybrid layered composite panels composed of fiber-reinforced cementitious composites against high-velocity projectile impact (choi_2022_resistance_of_hybrid_layered_composite): Hybrid layered composite panels against high-velocity impact. Source: 00_sources/by_lee_lab_publications/source_notes/choi-2022-resistance-of-hybrid-layered-composite_source_note.md - 2026 — Combined effect of hybrid PE-PBO fiber reinforcement on the mechanical properties of lightweight fly ash-slag-based engineered geopolymer composites at ambient temperature and after exposure to elevated temperatures (nguyen_2026_combined_effect_of_hybrid_pe_pbo): Elevated-temperature residual behavior of lightweight hybrid EGC. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2026-combined-effect-of-hybrid-pe-pbo_source_note.md - 2026 — Ice-cooled ultra-high performance engineered geopolymer composites for ambient temperature curing: Formulation, properties, and microscale investigation (nguyen_2026_ice_cooled_ultra_high_performance_engineered_geopolymer): Ice-cooled UHP-EGC formulation and microscale investigation. Source: 00_sources/by_lee_lab_publications/source_notes/nguyen-2026-ice-cooled-ultra-high-performance-engineered-geopolymer_source_note.md

Global Atlas connection: - [[high_strength_ecc]] — 04_material_systems/high_strength_ecc.md - [[direct_tensile_test]] — 05_experiments/direct_tensile_test.md - [[impact_testing]] — 05_experiments/impact_testing.md - [[structural_component_testing]] — 05_experiments/structural_component_testing.md

4. Novelty claim bank for manuscripts and proposals

Cementless binder transfer

The lab is positioned as an early and sustained contributor that transferred ECC strain-hardening logic from Portland-cement matrices to alkali-activated slag and fly ash/geopolymer binders.

Ductility through matrix/flaw design

The lab’s extreme-ductility EGC line uses rubber, EPS, density reduction, activator pretreatment, and hybrid fibers as design variables for crack activation, not simply as fillers.

Circular fiber strategy

The selvage-fiber line reframes high-cost PE reinforcement as a circular-economy textile-waste resource while retaining direct tensile ductility and crack-width control.

Healing as crack-controlled function

The self-healing line positions ECC crack-width control and fiber bridging as functional durability mechanisms, measured through permeability, chloride diffusion, corrosion, and reloading response.

Micromechanics-to-application bridge

The lab connects fiber dispersion/bridging analysis to application-facing performance such as impact resistance, layered panels, and elevated-temperature residual behavior.

AI/Wiki-RAG opportunity

The completed Atlas can be framed as the next infrastructure layer: a source-grounded literature-to-design system linking micromechanics, mixture design, and lab positioning.

5. Suggested use in manuscript/proposal writing

Manuscript introduction logic chain

General ECC micromechanics established tensile strain-hardening and crack-width control.
However, practical deployment requires moving beyond ordinary Portland cement and virgin fiber systems.
Lee lab publications show that the same design logic can be transferred to AAS/geopolymer binders, recycled selvage fibers, and self-healing systems.
The current manuscript/proposal should position its novelty as a specific extension of that transfer: material constraint -> micromechanical design response -> verified performance.

Proposal background logic chain

Infrastructure materials require lower carbon, lower cost, and higher durability.
ECC provides a proven micromechanical framework for ductility and crack control.
Lee lab research demonstrates multiple sustainable routes: cementless binders, recycled fibers, flaw-tailored low-density matrices, and self-healing.
The next step is a source-grounded AI/Wiki-RAG materials design system that links literature evidence to mixture and experiment planning.

6. Output and evidence files

• Lab publication index: 00_sources/by_lee_lab_publications/metadata/by_lee_lab_publications_source_index.csv
• Lab publication mapping: 06_lab_position/by_lee_publication_mapping.csv
• Lab claim-evidence matrix: 07_visualization/by_lee_lab_publications_claim_evidence_matrix.csv
• Existing lab-to-node edges: 07_visualization/by_lee_lab_position_edges.csv
• This lineage edge file: 07_visualization/lab_to_global_lineage_edges.csv
• Positioning map: 06_lab_position/our_lab_position_map.md

7. Next steps

1. Convert each axis into a dedicated positioning card under 06_lab_position/.
2. Add original PDFs for by_lee_lab_publications and update original_pdf_status.
3. Add mechanism/material/fiber/binder classification columns to the lab claim-evidence matrix.
4. Use this map to draft proposal background and manuscript novelty sections.

Graph refinement status

• First-pass graph refinement completed.
• Paper-to-node edge file: 07_visualization/graph_paper_to_node_edges.csv (365 edges).
• Concept-to-concept edge file: 07_visualization/graph_concept_to_concept_edges.csv (491 edges).
• Lab-to-global edge file: 07_visualization/graph_lab_to_global_edges.csv (103 edges).
• Excluded edge audit file: 07_visualization/graph_excluded_edges.csv (55 rows).
• Relations normalized; duplicate edges removed; all output target files verified to exist.