Lee et al. (2013) — Enhancing the Performance of Polypropylene Fiber Reinforced Cementitious Composite Produced with High Volume Fly Ash
Citation
Lee, B. Y., Bang, J. W., & Kim, Y. Y. (2013). Enhancing the performance of polypropylene fiber reinforced cementitious composite produced with high volume fly ash (폴리프로필렌 섬유로 보강된 하이볼륨 플라이애시 시멘트 복합재료의 성능 향상 기법). Journal of the Korea Institute for Structural Maintenance and Inspection, 17(3), 118–125.
- DOI:
10.11112/jksmi.2013.17.3.118 - Atlas layer: core
- Related Victor Li book chapter: Chapter 4: Matrix Flaw Size Tailoring (pp. 77–114) & Chapter 7: Alternative Reinforcing Fibers (Polypropylene Fibers) & Chapter 9: Green ECC (High-Volume Fly Ash Systems)
- Source PDF:
lee-2013-enhancing-the-performance-of-polypropylene-fiber.pdf - Extracted text:
full_text/lee-2013-enhancing-the-performance-of-polypropylene-fiber_full_text.md - Source note:
source_notes/lee-2013-enhancing-the-performance-of-polypropylene-fiber_source_note.md
Why this paper matters
Demonstrates how micromechanical matrix fracture toughness reduction (via high-volume fly ash, $FA/C$ up to 4.0) combined with artificial flaw tailoring (polystyrene beads) transforms low-cost polypropylene (PP) fibers from simple fire-resistant additives into high-ductility strain-hardening composites achieving up to 3.20 % tensile strain capacity.
Main contribution
- Formulates 5 High-Volume Fly Ash (HVFA) mixtures replacing 70 % to 80 % of cement with Class F fly ash ($FA/C = 2.2\text{--}4.0, w/b = 0.23\text{--}0.25$) reinforced with 2.0 vol. % high-strength PP fibers.
- Employs micromechanical steady-state cracking criteria and Wang & Li (2004) artificial flaw size tailoring principles using polystyrene beads to induce saturated multi-cracking.
- Lowers matrix fracture toughness ($K_m$) via high fly ash replacement, ensuring that the complementary energy margin $J_b'/J_{tip} \ge 1$ is satisfied despite PP fiber's low elastic modulus ($7.5\text{ GPa}$).
- Evaluates fresh slump flow, hardened density, ASTM C109 compressive strength, and uniaxial direct tensile stress-strain performance.
- Proves that tailored PP-HVFA composites achieve direct tensile strain capacities up to 3.20 % and tensile strengths of 3.8 to 4.5 MPa with dense multiple cracking.
Evidence summary
- Matrix Composition: Type I OPC + Class F Fly Ash ($FA/C = 2.2\text{ to }4.0$), silica sand ($S/B = 0.36$), $w/b = 0.23\text{--}0.25$, expandable polystyrene (EPS) beads for artificial flaw introduction.
- Fiber Specifications: 2.0 vol. % high-strength monofilament PP fiber ($l_f = 12\text{ mm}, d_f = 12\ \mu\text{m}, \sigma_f = 950\text{ MPa}, E_f = 7.5\text{ GPa}$).
- Mechanical Properties (28 days):
- Compressive strength: 32.5 to 48.0 MPa.
- Direct tensile strain capacity ($\epsilon_u$): 1.8 % to 3.20 % (optimal with HVFA + polystyrene flaw tailoring).
- Ultimate tensile strength ($\sigma_u$): 3.8 to 4.5 MPa.
- Saturated crack distribution: Multiple micro-cracks with average crack width $w_m < 80\ \mu\text{m}$.
Linked Atlas nodes
02_concepts/strain_hardening_criteria.md02_concepts/fiber_bridging_law.md04_material_systems/green_ecc.md04_material_systems/high_volume_fly_ash_ecc.md04_material_systems/pp_ecc.md05_experiments/direct_tensile_test.md02_concepts/circular_economy_materials.md
Relationship to Victor Li book
- Extends Victor Li (2019) Chapter 4 (Matrix Flaw Size Tailoring, pp. 77–114), Chapter 7 (PP Fibers, pp. 175–204), and Chapter 9 (Green ECC, pp. 235–265).
- Provides direct experimental validation of Victor Li's dual-tailoring strategy: shows that because PP fibers have a lower elastic modulus than PVA or PE, high tensile ductility can only be achieved by simultaneously lowering matrix fracture toughness ($K_m$) with high-volume fly ash and inserting uniform artificial micro-flaws.
Claim-evidence rows to add
| Atlas node | Claim | Evidence summary | Page/Figure/Table | Status |
|---|---|---|---|---|
04_material_systems/pp_ecc.md |
PP fiber reinforced HVFA composite with artificial polystyrene flaw tailoring achieves direct tensile ductility up to 3.20 % | Uniaxial direct tensile tests on dogbone specimens with varying $FA/C$ and flaw tailoring | Section 3.2 & 4.2, Fig. 3-5, Table 3 | verified_from_pdf |
04_material_systems/high_volume_fly_ash_ecc.md |
High-volume fly ash ($FA/C = 2.2\text{--}4.0$) lowers matrix fracture toughness, enabling PSH criteria satisfaction for low-modulus PP fibers | Micromechanical energy margin calculations and experimental tensile stress-strain validation | Section 2 & 4.1, Fig. 1 & 2, Table 2 | verified_from_pdf |
Verification status
- PDF preserved: yes (
lee-2013-enhancing-the-performance-of-polypropylene-fiber.pdf) - Text extracted: yes (
full_text/lee-2013-enhancing-the-performance-of-polypropylene-fiber_full_text.md) - DOI verified: yes (
10.11112/jksmi.2013.17.3.118) - Metadata verified: yes (J. Korea Inst. Struct. Maint. Insp., Vol. 17, No. 3, pp. 118–125, 2013)
- Claim-evidence matrix ready: yes
Cautions
- Without high fly ash replacement ($FA/C \ge 2.2$) or artificial flaw control, PP fiber composites exhibit single-crack Griffith brittle rupture or strain-softening due to insufficient bridging complementary energy.
- Early-age compressive strength (7 days) is lower due to high fly ash content, requiring moist curing.