Choi et al. (2016) — Ultra-high-ductile behavior of a polyethylene fiber-reinforced...

Citation

Jeong-Il Choi, Bang Yeon Lee, Ravi Ranade, Victor C. Li, Yun Lee (2016). Ultra-high-ductile behavior of a polyethylene fiber-reinforced alkali-activated slag-based composite. Cement and Concrete Composites, Vol. 70, pp. 153-158.

DOI: 10.1016/j.cemconcomp.2016.04.002
Atlas layer: extension
Related Victor Li book chapter: Chapter 2: Micromechanics of ECC; Chapter 7: Alternative Binders and Ultra-High Ductility
Source PDF: choi-2016-ultra-high-ductile-behavior-of-a-polyethylene.pdf
Extracted text: atlas/full_text/choi-2016-ultra-high-ductile-behavior-of-a-polyethylene_full_text.md
Source note: atlas/source_notes/choi-2016-ultra-high-ductile-behavior-of-a-polyethylene_source_note.md

Why this paper matters

Landmark paper establishing the feasibility of achieving ultra-high direct tensile strain capacity up to 7.50%, tensile strength of 13.06 MPa, and compressive strength of 54.8 MPa in a 100% cementless alkali-activated slag matrix reinforced with 1.75 vol% PE fibers.

Main contribution

Developed an ultra-high-ductile PE fiber-reinforced alkali-activated slag composite (PE-AASC) delivering direct tensile strain capacity of 7.50% and tensile strength of 13.06 MPa.
Demonstrated that decreasing w/b ratio to 0.26 simultaneously improves compressive strength (54.8 MPa), tensile strength (13.06 MPa), and tensile ductility (7.50%).
Achieved an extraordinary tensile-to-compressive strength ratio of 23.8% and tensile toughness 2.7 times higher than standard PVA-ECC.

Evidence summary

Tensile strain capacity: $7.50 \pm 0.45\%$ (M26), $6.33\%$ (M30), $5.35\%$ (M34), $4.58\%$ (M38) (Table 7, page 157).
Tensile strength: $13.06 \pm 2.40\text{ MPa}$ (M26), $11.46\text{ MPa}$ (M30), $7.64\text{ MPa}$ (M34), $5.06\text{ MPa}$ (M38) (Table 7, page 157).
Compressive strength: $54.8 \pm 1.5\text{ MPa}$ (M26), $49.0\text{ MPa}$ (M30), $42.3\text{ MPa}$ (M34), $36.3\text{ MPa}$ (M38) (Table 5, page 155).
Crack characteristics: Average number of cracks = 67.3, crack spacing = 1.20 mm, crack width = $88.9\ \mu\text{m}$ in M26.
Toughness: $0.0067\text{ MPa mm/mm}$ in M26 (2.7× PVA-ECC, 1.8× HSHD concrete).

Linked Atlas nodes

02_concepts/extreme_ductility_ecc.md
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
`02_concepts/extreme_ductility_ecc.md`	Cementless PE-AASC achieves direct tensile strain capacity up to 7.50% and tensile strength of 13.06 MPa at w/b = 0.26.	Tensile strain capacity reached 7.50% with 13.06 MPa tensile strength in M26.	Page 153, Abstract; Page 157, Table 7, Fig. 2	verified_from_pdf
`02_concepts/extreme_ductility_ecc.md`	Lowering w/b ratio to 0.26 raises the stress performance index to 2.68, driving 67.3 cracks and 2.7× higher toughness than PVA-ECC.	High stress performance index (2.68) promoted saturated cracking and 0.0067 MPa mm/mm toughness.	Pages 156-157, Section 3.3, Tables 6, 8	verified_from_pdf

Verification status

PDF preserved: yes (choi-2016-ultra-high-ductile-behavior-of-a-polyethylene.pdf)
Text extracted: yes (atlas/full_text/choi-2016-ultra-high-ductile-behavior-of-a-polyethylene_full_text.md)
DOI verified: yes (10.1016/j.cemconcomp.2016.04.002)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Aggregates were excluded in paste mixtures; adding sand changes matrix fracture toughness.
Standard 28-day water curing was used; ambient curing performance was explored in subsequent papers.