Ganesan et al. (2013) — Engineering Properties of Steel Fibre Reinforced Geopolymer Concrete

Citation

Ganesan, N., Indira, P. V., & Santhakumar, A. (2013). Engineering properties of steel fibre reinforced geopolymer concrete. Advances in Concrete Construction, 1(4), 305–318.

DOI: 10.12989/acc2013.1.4.305
Atlas layer: extension
Related Victor Li book chapter: Chapter 1: Material Spectrum (HPFRCC vs FRC) & Chapter 7: Alternative Reinforcing Fibers (Steel Fibers) & Chapter 9: Green ECC (Fly Ash Geopolymers)
Source PDF: ganesan-2013-engineering-properties-of-steel-fibre.pdf
Extracted text: full_text/ganesan-2013-engineering-properties-of-steel-fibre_full_text.md
Source note: source_notes/ganesan-2013-engineering-properties-of-steel-fibre_source_note.md

Why this paper matters

Provides essential mechanical baseline data for structural steel fiber-reinforced geopolymer concrete (SFRGPC, Grade M40), quantifying the scaling of splitting tensile strength (+61.6 %), modulus of rupture (+24.0 %), and elastic modulus (+64.9 %) as crimped steel fiber volume fraction increases from 0 % to 1.0 %.

Main contribution

Evaluates five steel fiber dosages (0 %, 0.25 %, 0.5 %, 0.75 %, 1.0 % by volume) in a Class F fly ash geopolymer concrete activated with sodium silicate and sodium hydroxide ($\text{Na}_2\text{SiO}_3/\text{NaOH} = 2.5$).
Tests 75 standard specimens for 28-day compressive strength, cylinder splitting tensile strength, prism flexural modulus of rupture, static modulus of elasticity ($E_c$), and Poisson's ratio ($\nu$).
Discovers that while compressive strength shows only nominal gain (+8.51 %, 42.3 to 45.9 MPa), splitting tensile strength surges by 61.63 % (3.86 to 6.24 MPa) and elastic modulus increases by 64.92 % (24.8 to 40.9 GPa).
Derives empirical polynomial and linear regression equations predicting structural design properties as a function of steel fiber volume fraction $V_f$.

Evidence summary

Binder & Activator: Low-calcium Class F fly ash, alkaline liquid ratio $\text{Na}_2\text{SiO}_3/\text{NaOH} = 2.5$, liquid-to-fly ash ratio = 0.39, heat curing at 60 °C for 24 hours.
Aggregates: Coarse aggregate (max size 20 mm) + river sand (Zone II).
Steel Fiber Specifications: Crimped geometry, length $l_f = 30\text{ mm}$, diameter $d_f = 0.45\text{ mm}$ (aspect ratio $l_f/d_f = 66$), ultimate tensile strength $\sigma_f = 800\text{ MPa}$, dosages $V_f = 0\%\text{ to }1.0\%$.
Hardened Mechanical Properties (28-day):
Compressive strength ($f_c$): 42.3 MPa (0 %) $\rightarrow$ 45.9 MPa (1.0 %, +8.51 %).
Splitting tensile strength ($f_{sp}$): 3.86 MPa (0 %) $\rightarrow$ 6.24 MPa (1.0 %, +61.63 %).
Modulus of rupture ($f_r$): 4.50 MPa (0 %) $\rightarrow$ 5.58 MPa (1.0 %, +24.0 %).
Modulus of elasticity ($E_c$): 24.8 GPa (0 %) $\rightarrow$ 40.9 GPa (1.0 %, +64.92 %).
Poisson's ratio ($\nu$): 0.16 (0 %) $\rightarrow$ 0.24 (1.0 %, +50 %).

Linked Atlas nodes

02_concepts/material_classification.md
04_material_systems/geopolymer_ecc.md
05_experiments/flexural_testing.md
05_experiments/splitting_tensile_test.md

Relationship to Victor Li book

Relates to Victor Li (2019) Chapter 1 (Material Classification) and Chapter 7 (Alternative Fibers).
Highlights the classical FRC behavior of coarse-aggregate steel-fiber geopolymer concrete: substantial improvement in splitting tensile and flexural capacity, but lacking direct tensile pseudo strain-hardening (due to coarse aggregate size 20 mm causing high matrix fracture toughness $K_m$).

Claim-evidence rows to add

Atlas node	Claim	Evidence summary	Page/Figure/Table	Status
`05_experiments/splitting_tensile_test.md`	1.0 vol. % crimped steel fibers increase splitting tensile strength of M40 fly ash geopolymer concrete by 61.6 % (to 6.24 MPa)	Cylinder splitting tests on 15 specimens per mix across 0 to 1.0 % steel fiber dosages	Section 3.2, Table 5, Fig. 5	verified_from_pdf
`02_concepts/material_classification.md`	Crimped steel fibers enhance elastic modulus of geopolymer concrete from 24.8 GPa to 40.9 GPa (+64.9 %)	Stress-strain cylinder testing measuring static Young's modulus and Poisson's ratio	Section 3.4 & 3.5, Table 5, Fig. 7	verified_from_pdf

Verification status

PDF preserved: yes (ganesan-2013-engineering-properties-of-steel-fibre.pdf)
Text extracted: yes (full_text/ganesan-2013-engineering-properties-of-steel-fibre_full_text.md)
DOI verified: yes (10.12989/acc2013.1.4.305)
Metadata verified: yes (Advances in Concrete Construction, Vol. 1, No. 4, pp. 305–318, 2013)
Claim-evidence matrix ready: yes

Cautions

Conventional fiber-reinforced geopolymer concrete (FRC) containing 20 mm coarse aggregates; exhibits tension-softening/deflection-hardening, not direct tensile pseudo strain-hardening.
Fly ash activation required thermal oven curing at 60 °C for 24 hours.