Lin et al. (2021) — Experimental study on the mechanical properties of different...

Citation

Chenlong Lin, Siyu Wang, Miao Chen, Yiyan Lu (2021). Experimental study on the mechanical properties of different fiber-reinforced seawater sea-sand engineered cementitious composites. Construction and Building Materials, Vol. 304, Article 124562.

DOI: 10.1016/j.conbuildmat.2021.124562
Atlas layer: extension
Related Victor Li book chapter: Chapter 3: Fiber-Matrix Interactions; Chapter 4: Marine/Sustainable ECC
Source PDF: lin-2021-experimental-study-on-the-mechanical.pdf
Extracted text: atlas/full_text/lin-2021-experimental-study-on-the-mechanical_full_text.md
Source note: atlas/source_notes/lin-2021-experimental-study-on-the-mechanical_source_note.md

Why this paper matters

Systematically maps the mechanical properties of early-strength sulfoaluminate cement-based seawater sea-sand ECC (SAC-SS-ECC) across 3 fiber types (PVA, PE, PP) and 4 fiber lengths (6, 9, 12, 18 mm) at 1.6 vol% fiber content, proving that 12 mm PE fibers provide optimal strain-hardening (3.023% strain, 4.047 MPa strength, 48 cracks, 32.94 μm residual width).

Main contribution

Developed rapid-hardening SS-ECC using sulfoaluminate cement (SAC) + SF + GBFS + artificial seawater (34‰) + raw sea-sand.
Proved that mechanical properties exhibit an inverted U-shape with fiber length, peaking at 12 mm for both PVA and PE fibers (6 mm has insufficient anchorage slip, while 18 mm causes fiber balling defects).
Showed that 12 mm PE and 12 mm PVA fiber-reinforced SS-ECC satisfy ideal elastoplastic toughness index criteria.

Evidence summary

Compressive strength: PE-12 = $41.87\text{ MPa}$, PVA-12 = $39.40\text{ MPa}$, PVA-18 = $30.80\text{ MPa}$ (Fig. 6, page 4).
Direct tensile properties:
PE (12 mm): $\sigma_{tu} = 4.047 \pm 0.095\text{ MPa}$, $\varepsilon_{tu} = 3.023 \pm 0.118\%$, $N_c = 48$, residual width = $32.94\ \mu\text{m}$.
PVA12 (12 mm): $\sigma_{tu} = 3.998 \pm 0.235\text{ MPa}$, $\varepsilon_{tu} = 2.083 \pm 0.112\%$, residual width = $39.88\ \mu\text{m}$.
PVA9 (9 mm): $\sigma_{tu} = 3.947\text{ MPa}$, $\varepsilon_{tu} = 0.903\%$.
PVA6, PVA18, PP12: Tension-softening/brittle ($\varepsilon_{tu} \approx 0.01\%$) (Table 5a, 5b, 6).

Linked Atlas nodes

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

Claim-evidence rows to add

Atlas node	Claim	Evidence summary	Page/Figure/Table	Status
`04_material_systems/green_ecc.md`	Sulfoaluminate cement-based SS-ECC with 12 mm PE fibers achieves 41.87 MPa compressive strength, 4.047 MPa tensile strength, and 3.023% tensile ductility.	Direct tensile and cube compression tests confirmed 12 mm PE mix delivered 4.047 MPa tensile strength and 3.023% strain capacity.	Pages 1, 5, 9, Section 3.2, Table 5a	verified_from_pdf
`02_concepts/strain_hardening_criteria.md`	Increasing fiber length beyond 12 mm in mortar mixes without high-shear mixing causes fiber agglomeration defects, reducing tensile ductility.	PVA fiber elongation increased from 0.014% (6 mm) to 2.083% (12 mm), but dropped to 0.010% (18 mm) due to fiber clumping.	Pages 1, 5, Section 3.2, Fig. 8, Table 5a	verified_from_pdf

Verification status

PDF preserved: yes (lin-2021-experimental-study-on-the-mechanical.pdf)
Text extracted: yes (atlas/full_text/lin-2021-experimental-study-on-the-mechanical_full_text.md)
DOI verified: yes (10.1016/j.conbuildmat.2021.124562)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Rapid setting kinetics of sulfoaluminate cement require strict batching and mixing sequence control.