Yu et al. (2015) — Residual compressive properties of strain-hardening...

Citation

Ke-quan Yu, Zhou-dao Lu, Jiangtao Yu (2015). Residual compressive properties of strain-hardening cementitious composite with different curing ages exposed to high temperature. Construction and Building Materials, Vol. 98, pp. 146-155.

DOI: 10.1016/j.conbuildmat.2015.08.041
Atlas layer: extension
Related Victor Li book chapter: Chapter 8: Durability and Extreme Environment Resistance
Source PDF: yu-2015-residual-compressive-properties-of-strain-hardening.pdf
Extracted text: atlas/full_text/yu-2015-residual-compressive-properties-of-strain-hardening_full_text.md
Source note: atlas/source_notes/yu-2015-residual-compressive-properties-of-strain-hardening_source_note.md

Why this paper matters

Provides systematic experimental evidence on the high-temperature resistance and residual compressive behavior of PVA-SHCC across curing ages from 1 to 28 days subjected to temperatures up to 800 °C, confirming zero explosive spalling due to sacrificial PVA fiber melting.

Main contribution

Characterized residual compressive strength and stiffness of PVA-SHCC exposed to 200, 400, 600, and 800 °C at 1, 3, 7, and 28 days of age.
Demonstrated that melting of PVA fibers at ~230 °C creates continuous micro-channels that vent internal steam pressure and prevent explosive spalling.
Showed that water quenching achieves 10–25% higher residual strength than air cooling due to secondary re-hydration.

Evidence summary

Baseline direct tensile properties: Strain capacity of $4.2\%$ (1d), $4.3\%$ (3d), $4.4\%$ (7d), and $4.0\%$ (28d); Tensile strength $2.1\text{ MPa}$ (1d) to $4.2\text{ MPa}$ (28d) (Table 1, page 148).
Unheated compressive strength: $8.92\text{ MPa}$ (1d), $20.28\text{ MPa}$ (3d), $24.20\text{ MPa}$ (7d), $30.14\text{ MPa}$ (28d).
High-temperature residual strength: Retains ~90% at 200 °C, ~60% at 400 °C, and ~18% at 800 °C.
Spalling resistance: Zero explosive spalling observed across all temperatures up to 800 °C.

Linked Atlas nodes

02_concepts/durability.md
04_material_systems/green_ecc.md
05_experiments/direct_tensile_test.md

Claim-evidence rows to add

Atlas node	Claim	Evidence summary	Page/Figure/Table	Status
`02_concepts/durability.md`	PVA-SHCC exhibits zero explosive spalling up to 800 °C due to vapor release micro-channels formed by sacrificial PVA fiber melting.	Continuous micro-porosity formed after fiber melting at ~230 °C prevented internal steam pressure buildup.	Pages 146-148, Section 1 & 3, Figs. 3, 4	verified_from_pdf
`05_experiments/direct_tensile_test.md`	Fly ash PVA-SHCC achieves tensile strain capacity >4.0% starting from 1 day of age through 28 days.	Direct tensile strain capacity was 4.2% at 1d and 4.0% at 28d under JSCE dogbone testing.	Page 148, Table 1	verified_from_pdf

Verification status

PDF preserved: yes (yu-2015-residual-compressive-properties-of-strain-hardening.pdf)
Text extracted: yes (atlas/full_text/yu-2015-residual-compressive-properties-of-strain-hardening_full_text.md)
DOI verified: yes (10.1016/j.conbuildmat.2015.08.041)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Residual tensile ductility post-fire was not measured (PVA fibers are degraded above 230 °C).
Above 600 °C, significant matrix strength loss occurs due to C-S-H dehydration.