Choi et al. (2019) — Effects of Aging on Tensile Properties of PE-AAS Composite
Citation
Jeong-Il Choi, Se-Eon Park, Su-Tae Kang, Bang Yeon Lee (2019). Effects of Aging on the Tensile Properties of Polyethylene Fiber-Reinforced Alkali-Activated Slag-Based Composite. Advances in Materials Science and Engineering, 2019, 7573635.
- DOI:
10.1155/2019/7573635 - Atlas layer: extension
- Related Victor Li book chapter: Chapter 8: Self-Healing and Durability of ECC (also Chapter 9)
- Source PDF:
primary_data/choi-2019-effects-of-aging-on-the.pdfIJP04619E_Effects of aging_AMSE.pdf` - Extracted text:
secondary_data/full_texts/choi-2019-effects-of-aging-on-the_full_text.mdsecondary_data/full_texts/IJP04619E_Effects of aging_AMSE_full_text.md` - Source note:
secondary_data/source_notes/choi-2019-effects-of-aging-on-the_source_note.mdsecondary_data/source_notes/IJP04619E_Effects of aging_AMSE_source_note.md`
Why this paper matters
Solves the classic aging embrittlement dilemma of cementitious PVA-ECC by proving that alkali-activated slag composites reinforced with PE fibers retain an extraordinary direct tensile strain capacity of 6.73 % at 90 days (only a 4.8 % drop from peak 7.07 % at 7 days) alongside 11.27 MPa tensile strength and 50.5 $\mu\text{m}$ crack width.
Main contribution
- Long-Term Ductility Preservation: Proved that PE-AAS composites eliminate the 30–40 % long-term ductility loss typical of cement-based PVA-ECC, retaining $6.73 \pm 0.53\text{ \%}$ tensile strain capacity at 90 days.
- High Tensile-to-Compressive Ratio: Sustained a tensile strength $> 20\text{ \%}$ of compressive strength across all ages, reaching $\sigma_{tu} = 11.27\text{ MPa}$ and $f_c = 53.4\text{ MPa}$ at 90 days.
- Rapid Micro-Crack Stabilization: Crack patterns converged by 14 days, maintaining ~100 saturated micro-cracks (spacing 0.81 mm) and tightly constrained crack widths ($50.5\ \mu\text{m}$).
Evidence summary
- Direct Tensile Response across Ages:
- 3 days: $\epsilon_u = 6.58\text{ \%}$, $\sigma_{tu} = 9.63\text{ MPa}$, $\sigma_{fc} = 3.65\text{ MPa}$ (Table 5, Page 5).
- 7 days (Peak): $\epsilon_u = 7.07\text{ \%}$, $\sigma_{tu} = 11.14\text{ MPa}$, $\sigma_{fc} = 3.93\text{ MPa}$.
- 28 days: $\epsilon_u = 6.81\text{ \%}$, $\sigma_{tu} = 10.98\text{ MPa}$, $\sigma_{fc} = 4.58\text{ MPa}$.
- 90 days: $\epsilon_u = 6.73\text{ \%}$, $\sigma_{tu} = 11.27\text{ MPa}$, $\sigma_{fc} = 4.84\text{ MPa}$.
- Compressive Strength: 3d = $34.0\text{ MPa}$ $\rightarrow$ 28d = $47.8\text{ MPa}$ $\rightarrow$ 90d = $53.4\text{ MPa}$ (Table 4, Page 3).
- Crack Characteristics at 90 Days: 99.8 cracks per 80 mm gauge length, crack spacing = $0.81\text{ mm}$, average crack width = $50.5 \pm 4.5\ \mu\text{m}$ (Table 6, Page 7).
Linked Atlas nodes
04_material_systems/green_ecc.md02_concepts/strain_hardening_criteria.md05_experiments/crack_width_distribution.md02_concepts/interface_properties.md05_experiments/direct_tensile_test.md
Relationship to Victor Li book
- Primary book anchor remains Victor Li (2019), Engineered Cementitious Composites (ECC).
- Extends Chapter 8 (Durability) and Chapter 9 (Green ECC) by demonstrating long-term chemical and frictional interface stability in cement-free geopolymer matrices.
Claim-evidence rows to add
| Atlas node | Claim | Evidence summary | Page/Figure/Table | Status |
|---|---|---|---|---|
04_material_systems/green_ecc.md |
PE fiber-reinforced alkali-activated slag composite maintains 6.73 % tensile ductility at 90 days (only 4.8 % drop from peak) | 90-day tensile strain capacity measured $6.73 \pm 0.53\text{ \%}$ with $\sigma_{tu} = 11.27\text{ MPa}$ | Page 7573635:4 & 5 / Table 5 / Fig. 5 | verified_from_pdf |
04_material_systems/green_ecc.md |
PE-AAS develops 53.4 MPa compressive strength and 11.27 MPa tensile strength at 90 days with $>20\text{ \%}$ strength ratio | Compressive strength reached 53.4 MPa and tensile strength reached 11.27 MPa | Page 7573635:3 & 5 / Table 4 & Table 5 | verified_from_pdf |
05_experiments/crack_width_distribution.md |
PE-AAS preserves saturated micro-cracking (~100 cracks, spacing 0.81 mm) and 50.5 $\mu\text{m}$ crack width at 90 days | Average crack width measured $50.5\ \mu\text{m}$ with 99.8 cracks at 90 days | Page 7573635:7 / Table 6 / Fig. 6 | verified_from_pdf |
Verification status
- PDF preserved: yes (in
primary_data/IJP04619E_Effects of aging_AMSE.pdf) - Text extracted: yes (PyMuPDF, 8 pages)
- DOI verified: yes (
10.1155/2019/7573635) - Page/figure/table verified: yes (all checked in PDF text)
- Claim-evidence matrix ready: yes
Cautions
- Water curing was maintained continuously; carbonation resistance under variable humidity warrants consideration.