Park et al. (2025) — Length effects of PE-based selvage fibers on fresh, fiber dispersion, and...

Citation

Se-Eon Park, Huy Hoàng Nguyễn, Yun Yong Kim, Youngsang Kim, Bang Yeon Lee (2025). Length effects of PE-based selvage fibers on fresh, fiber dispersion, and tensile properties of engineered cementitious composites. Journal of Sustainable Cement-Based Materials, Vol. 14, Issue 2, pp. 327–337.

DOI: 10.1080/21650373.2024.2441432
Atlas layer: extension
Related Victor Li book chapter: Chapter 4: Special ECCs / Green & Recycled Materials; Chapter 2: Micromechanics and Materials Design
Source PDF: park-2025-length-effects-of-pe-based-selvage.pdf
Extracted text: atlas/full_text/park-2025-length-effects-of-pe-based-selvage_full_text.md
Source note: atlas/source_notes/park-2025-length-effects-of-pe-based-selvage_source_note.md

Why this paper matters

Investigates the fiber length effects (5, 10, and 15 mm, 1.75 vol%) of upcycled polyethylene-based fabric selvage waste in ECC, revealing that longer fibers enhance compressive strength (up to 61.5 MPa), tensile strength (up to 8.04 MPa), and tensile strain capacity (up to 7.24% with 80.0 µm crack widths), while even 5 mm short fibers deliver 5.13% ductility.

Main contribution

Systematically quantified fiber length scaling (5, 10, 15 mm) for recycled PE selvage fibers in ECC.
Proved that increasing fiber length from 5 to 15 mm increases tensile ductility from 5.13% to 7.24% and tensile strength from 5.30 to 8.04 MPa.
Demonstrated that average crack widths remain invariant and tightly controlled at $80.0\text{--}82.1\ \mu\text{m}$ across all lengths.
Calibrated 2D crack spacing equations, extracting an optimal frictional bond strength $\tau_0 = 1.132\text{ MPa}$.

Evidence summary

Mechanical performance:
F-15 ($15\text{ mm}$): $f_{cu} = 61.5\pm 1.8\text{ MPa}$, $\sigma_{cr} = 2.89\text{ MPa}$, $\sigma_{ts} = 8.04\pm 0.59\text{ MPa}$, $\varepsilon_{ts} = 7.24\pm 0.39\%$, $U_t = 0.395\text{ MPa}\cdot\text{m/m}$, $71.5$ cracks, crack width $80.0\ \mu\text{m}$.
F-10 ($10\text{ mm}$): $f_{cu} = 59.7\text{ MPa}$, $\sigma_{ts} = 7.71\pm 0.82\text{ MPa}$, $\varepsilon_{ts} = 6.73\pm 0.59\%$, $66.4$ cracks, crack width $81.6\ \mu\text{m}$.
F-5 ($5\text{ mm}$): $f_{cu} = 58.4\text{ MPa}$, $\sigma_{ts} = 5.30\pm 0.37\text{ MPa}$, $\varepsilon_{ts} = 5.13\pm 0.67\%$, $50.0$ cracks, crack width $82.1\ \mu\text{m}$ (Tables 5, 6, 8, Figs. 10, 11).
Fresh properties: Mini-slump flow was $133.2\text{ mm}$ (F-5), $129.2\text{ mm}$ (F-10), and $122.5\text{ mm}$ (F-15) (Table 4, Fig. 8).
Fiber dispersion: SEM-EDS confirmed uniform fiber dispersion ($\alpha_f$) across all fiber lengths (Table 9, Fig. 14).

Linked Atlas nodes

04_material_systems/green_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`	Increasing recycled PE selvage fiber length from 5 mm to 15 mm (1.75 vol%) increases ECC tensile strength from 5.30 to 8.04 MPa and tensile strain capacity from 5.13% to 7.24% while keeping crack width tightly controlled to 80–82 µm.	JSCE uniaxial tension tests confirmed 7.24% strain capacity and 8.04 MPa tensile strength in F-15.	Pages 2, 7, 8, 10, Section 3.3 & Abstract, Tables 5, 6, 8, Figs. 10, 11	verified_from_pdf
`02_concepts/strain_hardening_criteria.md`	Even with ultra-short 5 mm selvage fibers, the high strength (3000 MPa) and hydrophobicity of PE enable robust strain hardening (5.13% strain capacity, strength ratio σts/σcr = 1.88) with frictional bond strength calibrated to 1.132 MPa.	Direct tension tests and theoretical crack spacing calibration validated robust pseudo strain hardening in F-5.	Pages 8, 10, Section 3.3, Tables 6, 7, 8, Fig. 10a	verified_from_pdf

Verification status

PDF preserved: yes (park-2025-length-effects-of-pe-based-selvage.pdf)
Text extracted: yes (atlas/full_text/park-2025-length-effects-of-pe-based-selvage_full_text.md)
DOI verified: yes (10.1080/21650373.2024.2441432)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Longer fibers (15 mm) exhibit slight bending during paste mixing, resulting in diminishing marginal strength gains compared to 10 mm fibers.