Wang et al. (2024) — Compressive performance and analytical modeling of early strength seawater...

Citation

Siyu Wang, Chenlong Lin, Shan Li, Yiyan Lu (2024). Compressive performance and analytical modeling of early strength seawater sea sand engineered cementitious composites. Journal of Building Engineering, Vol. 90, Article 109282.

DOI: 10.1016/j.jobe.2024.109282
Atlas layer: extension
Related Victor Li book chapter: Chapter 4: Special ECCs / Rapid Repair & Marine; Chapter 6: Structural Modeling and Analysis
Source PDF: wang-2024-compressive-performance-and-analytical-modeling.pdf
Extracted text: atlas/full_text/wang-2024-compressive-performance-and-analytical-modeling_full_text.md
Source note: atlas/source_notes/wang-2024-compressive-performance-and-analytical-modeling_source_note.md

Why this paper matters

Develops rapid-hardening early-strength seawater sea-sand ECC (ESSECC) based on sulfoaluminate cement (R-SAC), CNTs (0.05–0.30%), and 2.0 vol% PVA fibers for rapid emergency coastal infrastructure repair, achieving 33.4 MPa compressive strength in just 2 hours (58.0% of 28d strength) and up to 66.8 MPa at 28 days, establishing a comprehensive age-dependent compressive constitutive model.

Main contribution

Overcame the slow early hydration kinetics of high-volume fly ash marine ECCs by using rapid-hardening sulfoaluminate cement.
Reached $31.8\text{--}35.7\text{ MPa}$ compressive strength in 2 hours, $42.5\text{--}52.4\text{ MPa}$ in 3 days, and $52.0\text{--}66.8\text{ MPa}$ at 28 days.
Enhanced matrix density by 7.2% via $0.15\text{ wt\%}$ CNT addition, and increased peak compressive strain by 32.8% via 2.0 vol% PVA fibers.
Formulated an age- and composition-dependent four-stage compressive constitutive model ($R^2 > 0.95$).

Evidence summary

Compressive strength progression: 2 h ($31.8\text{--}35.7\text{ MPa}$), 3 d ($42.5\text{--}52.4\text{ MPa}$), 7 d ($46.2\text{--}57.7\text{ MPa}$), 28 d ($52.0\text{--}66.8\text{ MPa}$) (Table 5, page 6, Fig. 6).
Elastic modulus & Toughness: $E_0 = 15.2\text{--}20.0\text{ GPa}$ at 2 h, rising to $21.3\text{--}27.6\text{ GPa}$ at 28 d; Poisson's ratio $\nu_0 = 0.20\text{--}0.29$ (Table 5).
Failure Mode: Non-explosive ductile diagonal shear failure with 20% residual softening capacity (Figs. 3, 5).

Linked Atlas nodes

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
`04_material_systems/green_ecc.md`	Early-strength seawater sea-sand ECC (ESSECC) based on sulfoaluminate cement and 0.15% CNTs develops 33.4 MPa compressive strength in 2 hours (58% of 28d) and 58.2–66.8 MPa at 28 days.	ASTM C109 / JC/T 2461 compressive testing on 132 cube and 264 prism specimens verified early-age strength kinetics.	Pages 1, 6, Section 3.3 & Abstract, Table 5, Figs. 4, 6	verified_from_pdf
`02_concepts/strain_hardening_criteria.md`	Incorporating 0.15% CNTs increases ESSECC compressive strength by 7.2% via nano-void filling, while 2.0 vol% PVA fibers increase peak compressive strain by 32.8% and provide 20% residual softening capacity.	Uniaxial compressive stress-strain tests confirmed CNT matrix strengthening and PVA fiber ductility enhancement.	Pages 1, 4, 6, Section 3.2, 3.3 & Abstract, Table 5, Figs. 3, 5	verified_from_pdf

Verification status

PDF preserved: yes (wang-2024-compressive-performance-and-analytical-modeling.pdf)
Text extracted: yes (atlas/full_text/wang-2024-compressive-performance-and-analytical-modeling_full_text.md)
DOI verified: yes (10.1016/j.jobe.2024.109282)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Rapid-hardening matrix demands precise mixer timing and superplasticizer dosing due to fast initial set.