Choi et al. (2019) — Strain-Hardening of Slag Composites with Zirconia Silica Fume
Citation
Jeong-Il Choi, Se-Eon Park, Huy Hoàng Nguyễn, Sang Lyul Cha, Bang Yeon Lee (2019). Strain-Hardening and High-Ductile Behavior of Alkali-Activated Slag-Based Composites with Added Zirconia Silica Fume. Materials, 12(21), 3523.
- DOI:
10.3390/ma12213523 - Atlas layer: extension
- Related Victor Li book chapter: Chapter 4: Micromechanics-Based Material Design (also Chapter 10 & Chapter 9)
- Source PDF:
primary_data/choi-2019-strain-hardening-and-high-ductile-behavior-of.pdfIJP04819E_Strain-hardening and high-ductile_materials_03523.pdf` - Extracted text:
secondary_data/full_texts/choi-2019-strain-hardening-and-high-ductile-behavior-of_full_text.mdsecondary_data/full_texts/IJP04819E_Strain-hardening and high-ductile_materials_03523_full_text.md` - Source note:
secondary_data/source_notes/choi-2019-strain-hardening-and-high-ductile-behavior-of_source_note.mdsecondary_data/source_notes/IJP04819E_Strain-hardening and high-ductile_materials_03523_source_note.md`
Why this paper matters
Proves that adding 5 wt. % zirconia silica fume (ZSF) to polyethylene (PE) fiber-reinforced alkali-activated slag composites simultaneously enhances compressive strength by 18.8 % (to 53.5 MPa), tensile strength by 26.5 % (to 14.9 MPa), and direct tensile strain capacity by 13.7 % (to 6.10 %), delivering an exceptional tensile-to-compressive strength ratio of 27.6 % and tensile toughness of 0.57 $\text{MPa}\cdot\text{m/m}$.
Main contribution
- Simultaneous Strength & Ductility Surge: Achieved simultaneous improvements in compressive strength ($45.0 \rightarrow 53.5\text{ MPa}$), tensile strength ($11.8 \rightarrow 14.9\text{ MPa}$), and tensile ductility ($5.36\text{ \%} \rightarrow 6.10\text{ \%}$) by adding 5 % ZSF at $w/b=0.21$.
- Exceptional Tensile Efficiency: Delivered a tensile-to-compressive strength ratio of 27.6 % and hardening toughness of $0.57\text{ MPa}\cdot\text{m/m}$ (1.3–2.1x higher than 150+ MPa UHPCs).
- Crack Microstructure Refinement: Increased the number of saturated micro-cracks by 30 % while cutting crack spacing by 23 % and crack width by 13 %.
Evidence summary
- Direct Tensile Response:
W21-S5(5 % ZSF, $w/b=0.21$): $\epsilon_u = 6.10\text{ \%}$, $\sigma_{tu} = 14.9\text{ MPa}$, $\sigma_{fc} = 5.6\text{ MPa}$, Toughness = $0.57\text{ MPa}\cdot\text{m/m}$ (Figs. 5–8, Table 3, Pages 7–10).W21-S0(Control, $w/b=0.21$): $\epsilon_u = 5.36\text{ \%}$, $\sigma_{tu} = 11.8\text{ MPa}$, $\sigma_{fc} = 4.8\text{ MPa}$.W25-S5($w/b=0.25$): $\epsilon_u = 6.81\text{ \%}$, $\sigma_{tu} = 11.0\text{ MPa}$.W30-S5($w/b=0.30$): $\epsilon_u = 6.45\text{ \%}$, $\sigma_{tu} = 8.6\text{ MPa}$.- Compressive Strength: W21-S5 = $53.5\text{ MPa}$ vs W21-S0 = $45.0\text{ MPa}$ (Fig. 3, Page 5).
- Crack Characteristics: 30 % more cracks, 23 % narrower crack spacing, 13 % tighter crack width in W21-S5 compared to W21-S0 (Fig. 10, Page 12).
Linked Atlas nodes
04_material_systems/green_ecc.md04_material_systems/high_strength_ecc.md02_concepts/strain_hardening_criteria.md05_experiments/crack_width_distribution.md05_experiments/direct_tensile_test.md
Relationship to Victor Li book
- Primary book anchor remains Victor Li (2019), Engineered Cementitious Composites (ECC).
- Directly extends Chapter 4 and Chapter 10 by demonstrating that ultra-fine pozzolanic micro-fillers (ZSF) can elevate tensile strength to 15 MPa without sacrificing the complementary energy required for $>6\text{ \%}$ tensile strain capacity.
Claim-evidence rows to add
| Atlas node | Claim | Evidence summary | Page/Figure/Table | Status |
|---|---|---|---|---|
04_material_systems/green_ecc.md |
5 wt. % zirconia silica fume increases compressive strength by 18.8 %, tensile strength by 26.5 %, and tensile strain capacity by 13.7 % in PE-AAS | W21-S5 achieved $f_c = 53.5\text{ MPa}$, $\sigma_{tu} = 14.9\text{ MPa}$, and $\epsilon_u = 6.10\text{ \%}$ | Page 3523:1 & 14 / Fig. 3 & Fig. 6 | verified_from_pdf |
04_material_systems/high_strength_ecc.md |
PE-AAS with 5 % ZSF achieves 27.6 % tensile-to-compressive ratio and 0.57 $\text{MPa}\cdot\text{m/m}$ toughness, outperforming ductile UHPCs | Tensile-to-compressive ratio reached 27.6 % with toughness 1.27–2.11x higher than 150 MPa UHPCs | Page 3523:9 & 10 / Table 3 / Fig. 8 | verified_from_pdf |
05_experiments/crack_width_distribution.md |
Adding ZSF multiplies crack count by 30 % while narrowing crack spacing by 23 % and crack width by 13 % | Crack pattern analysis confirmed 30 % crack multiplication and refined crack width | Page 3523:10 & 14 / Fig. 9 & Fig. 10 | verified_from_pdf |
Verification status
- PDF preserved: yes (in
primary_data/IJP04819E_Strain-hardening and high-ductile_materials_03523.pdf) - Text extracted: yes (PyMuPDF, 15 pages)
- DOI verified: yes (
10.3390/ma12213523) - Page/figure/table verified: yes (all checked in PDF text)
- Claim-evidence matrix ready: yes
Cautions
- High specific surface area of ZSF requires increased superplasticizer dosage to ensure proper fresh workability.