Choi et al. (2022) — Highly ductile behavior and sustainability of engineered...

Citation

Jeong-Il Choi, Se-Eon Park, YoungMin Kim, Kanghyeok Yang, Yun Yong Kim, Bang Yeon Lee (2022). Highly ductile behavior and sustainability of engineered cementitious composites reinforced by PE based selvage fibers. Cement and Concrete Composites, Vol. 134, Article 104729.

DOI: 10.1016/j.cemconcomp.2022.104729
Atlas layer: extension
Related Victor Li book chapter: Chapter 3: Micro-mechanics; Chapter 4: Sustainable / Recycled ECC
Source PDF: choi-2022-highly-ductile-behavior-and-sustainability.pdf
Extracted text: atlas/full_text/choi-2022-highly-ductile-behavior-and-sustainability_full_text.md
Source note: atlas/source_notes/choi-2022-highly-ductile-behavior-and-sustainability_source_note.md

Why this paper matters

Breakthrough paper upcycling industrial textile waste by deploying recycled PE-glass selvage short fibers (1.75 vol%) in ECC, where 16 mm cut selvage fibers (M-SC) deliver 10.81 ± 0.44 MPa tensile strength and 6.55 ± 0.18% tensile strain capacity (surpassing virgin PE fiber ECC ductility by +36.6%) while significantly cutting embodied energy and material costs.

Main contribution

Developed three mechanical processing methods for high-performance PE selvage waste from protective gloves.
Proved that precision-cut 16 mm selvage fibers (M-SC) disperse uniformly without clumping and outperform virgin PE fibers in tensile ductility ($6.55\%$ vs $4.80\%$) and tensile toughness ($0.44\text{ MPa}\cdot\text{m/m}$ vs $0.35\text{ MPa}\cdot\text{m/m}$).
Demonstrated high sustainability index by valorizing discarded high-modulus polymer filaments into structural ductile composites.

Evidence summary

Compressive strength & density: $f_{cu} = 56.8\text{--}61.2\text{ MPa}$, $\rho_s = 1.94\text{--}1.99\text{ g/cm}^3$ (Table 4, page 4).
Direct tensile properties:
M-SC (16 mm cut selvage): $\sigma_{tc} = 2.91\text{ MPa}$, $\sigma_{tu} = 10.81 \pm 0.44\text{ MPa}$, $\varepsilon_{tu} = 6.55 \pm 0.18\%$, $E_t = 0.44\text{ MPa}\cdot\text{m/m}$.
M-PE (Virgin PE control): $\sigma_{tc} = 3.57\text{ MPa}$, $\sigma_{tu} = 11.10 \pm 0.62\text{ MPa}$, $\varepsilon_{tu} = 4.80 \pm 0.19\%$, $E_t = 0.35\text{ MPa}\cdot\text{m/m}$.
M-S (50 mm unraveled): $\sigma_{tu} = 7.32\text{ MPa}$, $\varepsilon_{tu} = 4.49\%$.
M-SP (Direct cut): $\sigma_{tu} = 6.02\text{ MPa}$, $\varepsilon_{tu} = 4.34\%$ (Table 5, page 6, Fig. 4).
Crack characteristics: M-SC developed 63.5 cracks in 80 mm gage length with average crack width of $82.5\ \mu\text{m}$ (Table 7, page 7).

Linked Atlas nodes

04_material_systems/green_ecc.md
02_concepts/extreme_ductility_ecc.md
02_concepts/strain_hardening_criteria.md
05_experiments/direct_tensile_test.md

Claim-evidence rows to add

Atlas node	Claim	Evidence summary	Page/Figure/Table	Status
`04_material_systems/green_ecc.md`	Recycled PE filament-based selvage waste cut to 16 mm produces ECC with 10.81 ± 0.44 MPa tensile strength and 6.55 ± 0.18% strain capacity, exceeding virgin PE ductility.	Direct tensile tests verified that 16 mm cut selvage fibers increased tensile strain capacity to 6.55% (vs 4.80% in virgin PE).	Pages 1, 5-6, Section 3.2, Table 5, Fig. 4c	verified_from_pdf
`02_concepts/strain_hardening_criteria.md`	Mechanical cutting of selvage fibers to 16 mm prevents fiber clumping and produces uniform tensile multiple cracking with high toughness (0.44 MPa·m/m).	Fracture surface observation and crack analysis confirmed uniform pullout and 63.5 microcracks in 80 mm gage.	Pages 4-7, Section 3.2, Figs. 5, 7, Table 7	verified_from_pdf

Verification status

PDF preserved: yes (choi-2022-highly-ductile-behavior-and-sustainability.pdf)
Text extracted: yes (atlas/full_text/choi-2022-highly-ductile-behavior-and-sustainability_full_text.md)
DOI verified: yes (10.1016/j.cemconcomp.2022.104729)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Average crack width ($82.5\ \mu\text{m}$) is wider than virgin PE ECC ($34.5\ \mu\text{m}$).