Nguyen et al. (2024) — Crack-healing of cost-effective engineered cementitious composites...

Citation

Huy Hoàng Nguyễn, Phương Hoàng Nguyễn, Quang-Hiếu Lương, Se-Eon Park, Youngsang Kim, Bang Yeon Lee (2024). Crack-healing of cost-effective engineered cementitious composites reinforced by recycled selvage fiber. Cement and Concrete Composites, Vol. 154, Article 105776.

DOI: 10.1016/j.cemconcomp.2024.105776
Atlas layer: extension
Related Victor Li book chapter: Chapter 4: Special ECCs / Recycled Materials; Chapter 7: Self-Healing and Durability
Source PDF: nguyen-2024-crack-healing-of-cost-effective-engineered-cementitious.pdf
Extracted text: atlas/full_text/nguyen-2024-crack-healing-of-cost-effective-engineered-cementitious_full_text.md
Source note: atlas/source_notes/nguyen-2024-crack-healing-of-cost-effective-engineered-cementitious_source_note.md

Why this paper matters

First experimental study investigating the autogenous crack-healing and mechanical performance of cost-effective engineered cementitious composites reinforced by 1.5 vol% recycled selvage fibers (PE-Glass-PET hybrid bundles), proving that a 50% slag mix (ECC-S-RSF) achieves 83.5 MPa compressive strength, 9.00 MPa tensile strength, 10.24% tensile strain capacity, and complete crack sealing up to 80 µm after 56 days of water immersion.

Main contribution

Pioneered the utilization of ternary recycled selvage fibers (RSF: 81% PE + 7% Glass + 12% PET) for simultaneous extreme ductility and autogenous crack healing.
Developed ECC-S-RSF (50% GGBS + 5% crumb rubber), attaining $f_c = 83.5\text{ MPa}$, $\sigma_0 = 9.00\text{ MPa}$, and $\varepsilon_{tu} = 10.24\%$.
Demonstrated superior cost efficiency ($C_e$), outperforming previous recycled-fiber ECCs by 26.3-fold and ultra-high performance PE-ECC by 3.5-fold.

Evidence summary

Compressive strength & density: ECC-S-RSF achieved $83.5\text{ MPa}$ ($2.07\text{ g/cm}^3$); ECC-F-RSF achieved $53.5\text{ MPa}$ ($1.85\text{ g/cm}^3$) (Section 3.1, Fig. 6).
Direct tensile properties:
ECC-S-RSF: $\sigma_{fc} = 4.65\text{ MPa}$, $\sigma_0 = 9.00 \pm 1.09\text{ MPa}$, $\varepsilon_{tu} = 10.24 \pm 1.32\%$, 42.5 cracks (Table 4, page 5, Fig. 7b).
ECC-F-RSF: $\sigma_{fc} = 4.99\text{ MPa}$, $\sigma_0 = 7.58\text{ MPa}$, $\varepsilon_{tu} = 4.67 \pm 1.19\%$ (Table 4, Fig. 7a).
Crack-healing & Reloading: 100% sealing for cracks $\le 80\ \mu\text{m}$; reloaded ECC-S-RSF achieved $10.79\text{ MPa}$ tensile strength and $5.16\%$ residual strain capacity (Table 7, Figs. 11, 15).

Linked Atlas nodes

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

Claim-evidence rows to add

Atlas node	Claim	Evidence summary	Page/Figure/Table	Status
`02_concepts/extreme_ductility_ecc.md`	RSF-ECC incorporating 50% GGBS (ECC-S-RSF) achieves 83.5 MPa compressive strength, 9.00 MPa tensile strength, and 10.24% tensile strain capacity with 1.5 vol% recycled selvage fibers.	Direct tensile and compressive tests on JSCE specimens verified 83.5 MPa compressive strength and 10.24% strain capacity.	Pages 1, 4, 5, Section 3.1 & Abstract, Table 4, Figs. 6, 7b	verified_from_pdf
`04_material_systems/green_ecc.md`	ECC-S-RSF achieves complete autogenous crack sealing up to 80 µm after 56 days of water curing, retaining 10.79 MPa tensile strength upon reloading via CaCO3 and C-S-H precipitation.	Optical microscopy, reloading tensile tests, and SEM/EDS confirmed 80 µm crack closure and CaCO3 precipitation.	Pages 8, 10, Section 3.2, 3.3 & Abstract, Table 7, Figs. 11b, 15b, 18	verified_from_pdf

Verification status

PDF preserved: yes (nguyen-2024-crack-healing-of-cost-effective-engineered-cementitious.pdf)
Text extracted: yes (atlas/full_text/nguyen-2024-crack-healing-of-cost-effective-engineered-cementitious_full_text.md)
DOI verified: yes (10.1016/j.cemconcomp.2024.105776)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Internal crack sealing is slower than surface mouth healing due to limited $CO_3^{2-}$ ion penetration.