Yu et al. (2018) — Development of ultra-high performance engineered...

Citation

Ke-Quan Yu, Jiang-Tao Yu, Jian-Guo Dai, Zhou-Dao Lu, Surendra P. Shah (2018). Development of ultra-high performance engineered cementitious composites using polyethylene (PE) fibers. Construction and Building Materials, Vol. 158, pp. 217-227.

DOI: 10.1016/j.conbuildmat.2017.10.040
Atlas layer: extension
Related Victor Li book chapter: Chapter 2: Micromechanics; Chapter 5: High-Strength ECC
Source PDF: yu-2018-development-of-ultra-high-performance-engineered.pdf
Extracted text: atlas/full_text/yu-2018-development-of-ultra-high-performance-engineered_full_text.md
Source note: atlas/source_notes/yu-2018-development-of-ultra-high-performance-engineered_source_note.md

Why this paper matters

Landmark paper establishing the foundational formulation of Ultra-High Performance Engineered Cementitious Composites (UHP-ECC), achieving compressive strength of 121.5 MPa, direct tensile strength of 17.42 MPa (peak 20 MPa), tensile ductility of 8.17% (peak 8.7%), and MOR of 27.68 MPa by deploying high-aspect-ratio ($L_f/d_f = 900$) PE fibers.

Main contribution

Overcame the trade-off between matrix compressive strength (>120 MPa) and tensile ductility (>8%) by tailoring PE fiber aspect ratio ($L_f/d_f = 900$).
Formulated room-temperature curable UHP-ECC using OPC + SF + GGBFS without requiring heat curing.
Demonstrated tight crack width control ($<100\ \mu\text{m}$), high flexural MOR (27.68 MPa), and large mid-span deflection (>10 mm) via DIC monitoring.

Evidence summary

Tensile properties: Average $\sigma_{tu} = 17.42\text{ MPa}$ (peak 20.0 MPa), $\varepsilon_{tu} = 8.17\%$ (peak 8.7%), $\sigma_{tc} = 10.2\text{ MPa}$, $E_t = 41.2\text{ GPa}$, fracture energy $>1500\text{ kJ/m}^3$ (Section 4.2, page 222).
Compressive properties: 70.7 mm cube = $121.5 \pm 5.2\text{ MPa}$, 100 mm cube = $111.4\text{ MPa}$, prism $E_c = 42.0\text{ GPa}$ (Table 5, page 223).
Flexural properties: Initial cracking = $20.40\text{ MPa}$, MOR = $27.68\text{ MPa}$, mid-span deflection = $10.1\text{ mm}$ (1/50 of span).
Crack characteristics: Residual crack width $<100\ \mu\text{m}$.

Linked Atlas nodes

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

Claim-evidence rows to add

Atlas node	Claim	Evidence summary	Page/Figure/Table	Status
`02_concepts/extreme_ductility_ecc.md`	UHP-ECC achieves tensile strength of 17.42 MPa (peak 20 MPa) and tensile ductility of 8.17% (peak 8.7%) at 121.5 MPa compressive strength using 2.0 vol% PE fibers ($L_f/d_f = 900$).	Dumbbell specimens achieved 17.42 MPa tensile strength and 8.17% strain capacity at $f_c = 121.5\text{ MPa}$.	Pages 217, 222, Section 4.2, Fig. 12	verified_from_pdf
`02_concepts/strain_hardening_criteria.md`	Increasing PE fiber aspect ratio to 900 expands complementary energy $J_b'$ to satisfy the PSH criterion in a 120 MPa dense matrix.	Aspect ratio increase from 428 to 900 ($d_f = 20\ \mu\text{m}$, $L_f = 18\text{ mm}$) provided sufficient bridging to ensure multiple cracking.	Page 219, Section 2, Eq. (2)	verified_from_pdf

Verification status

PDF preserved: yes (yu-2018-development-of-ultra-high-performance-engineered.pdf)
Text extracted: yes (atlas/full_text/yu-2018-development-of-ultra-high-performance-engineered_full_text.md)
DOI verified: yes (10.1016/j.conbuildmat.2017.10.040)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Paste/mortar system without coarse aggregate; rigorous multi-stage mixing is required.
Ambient curing was used; elevated heat curing will alter fiber-matrix interface friction.