Priority 1 Evidence Upgrade Log

Date: 2026-08-14 Scope: Priority 1 in 07_visualization/evidence_upgrade_plan.md — Chapter 2 equations/criteria and Chapter 4 direct tension / crack width evidence. Executor: Claude (claude-reviewer profile). Verifier: Hermes.

1. Files created

• 00_sources/victor_li_book/chapter2_equations_normalized.md
• Normalized symbol table (σ_o, σ_fc, J_b0, J_tip, σ(δ), δ_ss, c_mc, K_m, V_f, A_f, L_f, L_e, p(ϕ), p(z), η_B).
• Normalized statements of Eq. (2.2), (2.3), (2.4), (2.5), (2.8) and pointers to (2.12), (2.14), (2.15), (2.20).
• Robust margins σ_o/σ_fc ≥ 1.3 and J_b0/J_tip ≥ 2.7 anchored to OCR lines 410–414.

• Explicit needs verification block covering printed pages, exact equation typography, and reference [10].

• 00_sources/victor_li_book/chapter4_key_evidence.md

• Sections: Direct tension; Tensile strain capacity; Crack width and crack spacing/distribution; Flexure; Shear; Compression; Fatigue; Creep.

• Each section reports direct extracted evidence, atlas nodes affected, and per-section evidence status (book-extracted, needs page verification, or needs original figure/table verification).

• 07_visualization/chapter2_chapter4_claim_evidence_matrix.csv

• UTF-8-sig CSV, 30 data rows plus header.

• Columns: atlas_node, atlas_file, claim, chapter, section, page, equation_or_figure, evidence_source_file, status, notes.

• 07_visualization/priority1_upgrade_log.md

• This file.

2. Existing nodes inspected

• 02_concepts/strain_hardening_criteria.md
• 02_concepts/fiber_bridging_law.md
• 02_concepts/flaw_design.md
• 05_experiments/direct_tensile_test.md
• 05_experiments/crack_width_distribution.md
• 00_sources/victor_li_book/chapter2_key_evidence.md (source, not modified)
• 00_sources/victor_li_book/claim_evidence_tables/02 micromechanics_claim_evidence_seed.md (source, not modified)
• 00_sources/victor_li_book/claim_evidence_tables/04 mechanical properties_claim_evidence_seed.md (source, not modified)
• 00_sources/victor_li_book/extracted_text/02 micromechanics.txt (source, not modified)
• 00_sources/victor_li_book/extracted_text/04 mechanical properties.txt (source, not modified)
• 07_visualization/evidence_upgrade_plan.md (source, not modified)
• 09_ai_workflows/evidence_upgrade_task_queue.md (source, not modified)

3. Claims upgraded from seed to book-anchored status

Anchored to direct OCR-verified passages in chapter2_equations_normalized.md and chapter4_key_evidence.md:

• Strength criterion Eq. (2.2): σ_fc(c_fc) < σ_o. (strain_hardening_criteria)
• Energy criterion Eq. (2.4): J_b0 ≥ J_tip. (strain_hardening_criteria)
• Joint necessity of Eq. (2.2) and Eq. (2.4); violation reverts to FRC tension-softening. (strain_hardening_criteria)
• Robust margins σ_o/σ_fc ≥ 1.3 and J_b0/J_tip ≥ 2.7. (strain_hardening_criteria)
• σ(δ) as fiber-orientation and embedment-averaged single-fiber load (Eq. 2.5); N_B = (V_f/A_f) η_B with η_B = 2/π in 2D uniform-random. (fiber_bridging_law)
• σ_o is the peak of σ(δ); J_b0 is the maximum complementary energy of σ(δ). (fiber_bridging_law)
• Critical flaw size c_mc distinguishes active from inactive initiators. (flaw_design)
• Direct-tension σ_ult ranges 1–3 / 4–6 / 13–17 MPa across ECC classes. (direct_tensile_test)
• ε_ult > 2 % consistently across mixes; age-dependent, stabilizing at ~90 days. (direct_tensile_test)
• PSH strength index σ_ult/σ_fc > 1.3 for saturated multiple cracking. (direct_tensile_test)
• Saturated multiple-cracking pattern: ~45 μm average crack width, ~1.2 mm crack spacing. (crack_width_distribution)
• Log-normal crack-width distribution shifting with imposed strain. (crack_width_distribution)
• Two crack-width measurement methods and DIC alternative with ~10 μm resolution. (crack_width_distribution)
• MOR/σ_fc > 3 for strain-hardening; MOR ≈ 3–4× first-crack strength; MOR/σ_fc slope flattens at ε_ult ≈ 1 %. (flexural_test-adjacent; captured in CSV)

4. Claims left as needs verification

• Exact printed page numbers for all Chapter 2 and Chapter 4 equations, figures, and tables cited in the two evidence files (needs page verification).
• Precise printed forms of Eq. (2.5), (2.12), (2.14), (2.15), (2.20), and Eq. (2.3); OCR contains /C0, /C05, ðÞ artifacts.
• Reference [10] of Chapter 2 as the origin of the robust margins 1.3 and 2.7 (bibliographic pin still required).
• Reference [21] of Chapter 4 as the origin of the robust tensile-ductility criteria.
• Exact PE-ECC MOR values shown in Fig. 4.17.
• Specific 9.89 MPa shear stress attribution and Kanda et al. [29] parameters in Fig. 4.19.
• 205 MPa compressive strength with over 3 % tensile strain attribution to reference [34].
• Boshoff & van Zijl tensile creep specimens: cross-check 8-month duration and 2.8 MPa ultimate tensile strength value.
• Section 2.5.3 artificial-flaw "7 vol%" figure to be confirmed against printed value.

5. Concept-node updates

Minimal ## Evidence upgrade status sections added to (or, for two files, appended below existing evidence structure):

• 02_concepts/strain_hardening_criteria.md
• 02_concepts/fiber_bridging_law.md
• 02_concepts/flaw_design.md
• 05_experiments/direct_tensile_test.md
• 05_experiments/crack_width_distribution.md

No content was rewritten; only additive pointers to the two new evidence files and the claim-evidence CSV.

6. Files NOT modified

• Every file under 00_sources/victor_li_book/extracted_text/.
• Every file under 00_sources/victor_li_book/claim_evidence_tables/.
• 00_sources/victor_li_book/chapter2_key_evidence.md.
• 07_visualization/evidence_upgrade_plan.md and 09_ai_workflows/evidence_upgrade_task_queue.md.
• Everything under 06_lab_position/.
• Any node other than the five listed in Section 5 above.

7. Recommended next task

Priority 1 residual: physical page/figure/equation verification pass.

1. Open the printed Chapter 2 to sections 2.3.1, 2.3.2, 2.3.4, and 2.5.3.
2. Confirm printed page numbers for Eq. (2.2), Eq. (2.4), Eq. (2.5), Fig. 2.7, Fig. 2.10–2.12, and Table 2.1.
3. Confirm the exact printed forms of Eq. (2.3), (2.5), (2.12), (2.14), (2.15), and (2.20); replace the schematic normalized forms in chapter2_equations_normalized.md with the printed forms.
4. Resolve Chapter 2 reference [10] (source of robust margins 1.3 / 2.7).
5. Move onward to Priority 2 (Chapter 7 durability data and Chapter 8 LCA assumptions) per 07_visualization/evidence_upgrade_plan.md.