Technology framing · Literature anchors
From material class to engineering decision — and the literature that supports it
This page is the reference layer for the homepage commercial theses. It restates the published evidence at a level of specificity sufficient for academic and investor diligence and labels what the literature does not prove. INFORM-specific outcomes remain validation targets.
Material-class glossary
"Graphene" is not a useful generic label
Material-class discipline is a first-order scientific governance requirement (INFORM Architecture v2.0 §2). Comparative evidence from adjacent classes is directional only.
| Class | Typical optimal dosage (wt% / cement) | Peak compressive strength uplift | Peak GF reported | Percolation notes | Key literature |
|---|---|---|---|---|---|
| GO graphene oxide | 0.03–0.08 wt% | ~48% at 0.05 wt% | GF ≈ 35 at 0.05 wt%, w/c 0.35 | Percolation ~0.1 wt% in paste | Jing et al., Nanomaterials 2021 (PMC7830615) PubMed Central MDPI |
| GNP graphene nanoplatelets | 0.05–0.5 wt% (some work to 4 wt%) | 3–8% compressive · 15–24% flexural at 0.05 wt% | GF in 10² range (Du et al. four-probe); drop of ~42% resistivity at peak load (Rehman et al.) | Percolation as low as 0.007 wt% with excellent dispersion | Wang et al. ScienceDirect; Rehman et al. MDPI |
| TG turbostratic / flash graphene | 0.05–0.1 wt% (Tour-group claim) | ~25% compressive at 0.05 wt% | Piezoresistive GF not yet systematically published; inferred from GNP equivalence | Expected lower percolation than GNP due to easier exfoliation | Luong et al., Nature 577, 647–651, 2020 Nature; IEEE Spectrum coverage |
| MWCNT (benchmark) | 0.1–1 wt% | ~15–30% | GF = 166.6 at 1 wt% (Yoo et al., 2018) | 0.3–0.5 wt% typical; hybrid CNT + GNP can exceed | Yoo et al. 2018 Sage Journals |
Plain Portland cement paste resistivity sits at ~10⁶–10⁷ Ω·cm. Well-dispersed graphene-cement composites routinely achieve 10⁴–10⁵ Ω·cm (PubMed Central). A 2023 CNT-coated-aggregate study (Xu et al., Constr. Build. Mater.) reported 28-day resistivity 1,076 Ω·cm at 0.41 wt% CNT — a useful upper-end benchmark for INFORM's TG work. Single-group claims of rGO e-textile GF ≈ 2,000 (arXiv 2101.00140) are flagged as not independently replicated.
Raman / XRD fingerprints (turbostratic vs AB-stacked)
How we know the material is what we think it is
The Raman signature of turbostratic graphene is a single-Lorentzian 2D band at ~2,680–2,700 cm⁻¹ (FWHM ~45–60 cm⁻¹) versus the four-component, broader-bearing 2D band of AB (Bernal) graphite. Tour-group FJH samples show a sharp, narrow 2D, very low D-band (I_D/I_G < 0.1) for high-quality flash graphene, and a TS1 (~1886 cm⁻¹) plus TS2 (~2031 cm⁻¹) combination band diagnostic of rotational disorder between layers. XRD: AB graphite shows a sharp (002) at 2θ = 26.5° (d = 3.35 Å); turbostratic graphene shows a broadened, downshifted (002) at ~25.5–26.0° corresponding to expanded interlayer spacing 3.42–3.48 Å, with loss of (101)/(100) ordering.
Flash Joule Heating economics
Synthesis: what the literature actually shows
Luong et al., Nature 577, 647–651, 2020 reports 3,000 K for 10 ms via ~200 V capacitor discharge with 7.2 kJ/g (~8 kWh/kg) electrical input, yielding 80–90% from high-carbon sources (carbon black, anthracite, calcined coke). Subsequent Tour-group work extended this to waste-tyre rubber, mixed plastics and coffee grounds. A 2025 rapid-Joule scale-up (ScienceDirect S1385894725005248) reports 100 g batches at ~5 kWh/kg. Commercial status: Universal Matter (Tour-affiliated spinout, Burlington, ON); First Graphene (ASX:FGR) with PureGRAPH at Henderson, WA; Levidian (UK) pursuing methane pyrolysis (Nixene Publishing); independent replication and production economics at >100 t/yr remain contested. Treat the Tour-group $50–$125/ton electricity figure as a theoretical lower bound, not a delivered price. No independently audited delivered price below ~$50/kg presently exists. Graphene oxide bulk: $100–$500/kg.
Dispersion science (WP3)
Energy threshold, PCE compatibility, colloidal stability
Probe ultrasonication at 20–24 kHz is the laboratory standard. Konsta-Gdoutos et al., Cement and Concrete Composites (2025) identified a definitive energy threshold for GNP exfoliation into few-layer material at ~3,600 kJ/L in the presence of PCE; sub-optimal energy leaves multilayer stacks, excessive energy (>~5,000 kJ/L) introduces defects (D-band rise) and destabilises the colloid. Typical protocols: 50% amplitude, 6 s on / 4 s off pulse to limit heating, 30 min net, ice bath, sample volumes 50–500 mL laboratory-scale; scale-up replaces probe ultrasonication with high-shear mixing above ~1 L. PCE stabilises graphene via combined steric (PEG side-chains) and electrostatic (-COO⁻ backbone) mechanisms (Lu et al., Constr. Build. Mater. 2020). Optimal PCE:graphene ratios: 8–10 wt% for high-shear mixing, 10–12 wt% for ultrasonication. Targets: |ζ| > 30 mV, PDI < 0.3, ≥ 4-month suspension stability — feasible in 2025 GO-PCE work. Hydrodynamic sizes after optimal sonication: few-layer GNP 200–800 nm (Z-average); GO 100–500 nm; agglomerated suspensions > 2 μm. Compatible cement-dispersants include NSBs, naphthalene sulfonate (NSA), calcium lignosulfonate (CLS), methylcellulose, Triton X-100 and Pluronic F-127; SDS and Pluronic suspend in pure aqueous but fail in alkaline pore solution.
Structural health monitoring via conductive concrete (WP6–WP7)
State of the art and the two dominant blockers
Piezoresistive cementitious composites (CNT/CNF/GNP/CF) report gauge factors 30–200 in lab with stress sensitivity 1–4 %/MPa. Field demonstrations include CNT-cement pavement sensors at MnROAD (I-94, Minnesota) detecting truck passes (FHWA/ROSAP 40249), the Ubertini / D'Alessandro / Laflamme group's smart-shaking-table tests (MDPI) and carbon-microfibre concrete on the Valnerina composite bridge (Birgin et al., Materials and Structures, 2022), and self-sensing asphalt weigh-in-motion. No commercially certified self-sensing concrete product exists as of April 2026. Australian TRL framework: graphene-cement SHM at TRL 4–6 (validated components, prototype in relevant environment); CNT-cement SHM at TRL 5–6 (longer track record, field demonstrations); CF-cement SHM at TRL 6–7. The 2024 Construction and Building Materials bridge-SHM review (S0263224120428X) identifies calibration stability and gauge-factor drift under real-world moisture, temperature, freeze-thaw and polarisation cycles as the two dominant blockers.
Competing technologies — honest TRL and cost
How INFORM compares against incumbent SHM methods
| Technology | Sensitivity | Unit cost guide | TRL | Primary limitation |
|---|---|---|---|---|
| FBG fibre optic | Micro-strain, pm λ shift | Interrogator $15–50k; sensors $100–500 each | 8–9 | T/ε cross-sensitivity; interrogator cost |
| Brillouin DFOS | ~2 με, 0.1 °C, 20 cm–1 m resolution | Analyser $50–150k; fibre cheap (Fibrisense) | 7–9 | Expertise; interrogator cost |
| Rayleigh OFDR (Luna) | Sub-cm, high ε resolution | Sensuron static DFOS listed $16,495 | 7–8 | Short range (tens of m) |
| PZT electromechanical impedance | 10–500 kHz active | $20–100 per patch (MDPI) | 6–7 | Coupling to concrete; frequency selection |
| MEMS WSN (e.g. ADXL355) | Noise < 100 μg/√Hz | $100–500 per node | 7–9 | Low-frequency noise, sync, battery |
| Acoustic emission | μJ events | $500–5k per sensor | 8–9 (ASTM E2983-25) | Noise rejection, localisation |
| CNT-cement | GF 100–200 | Material only | 5–6 | No standards, moisture drift |
| Graphene-cement (INFORM) | GF 30–300 (lab) | Material only | 4–6 | Calibration, scale-up dispersion, standards |
| InSAR satellite | mm-level deformation | Per-km archive cost | 7–8 | Line-of-sight, slow cadence |
Digital twin for infrastructure SHM (WP6 / PULSE)
Architecture, protocols, latency and economics
Architecture standards: ISO 23247 (digital twin framework for manufacturing, adapted to civil), the Digital Twin Consortium reference architecture, ISO 19650 (BIM, the de facto framework for infrastructure DTs), supplemented by smartBIM IFC for interoperability, the UK CDBB Gemini Principles (public good, value creation, insight; federation, curation, evolution; security, openness, quality), and emerging work in ISO/IEC JTC 1/SC 41. Standard layered architecture: physical asset → data acquisition → ingestion/processing → twin model (semantic + geometric) → analytics/services → applications/UI. SHM sampling rates: 0.01–10 Hz for quasi-static strain/tilt; 50–1,000 Hz for vibration/modal; 1–100 kHz for acoustic emission. Protocols: LoRaWAN (class A, ~5–15 km range, ~50 kbps), NB-IoT (cellular, ~200 kbps), 4G/5G for bandwidth-heavy, MQTT/CoAP as application-layer messaging, OPC-UA common in industrial brownfield. Typical infrastructure DT SaaS lands at $100–$2,000 per asset per month depending on sensor count, model fidelity and user seats. Predictive maintenance algorithms follow Rytter's hierarchy (detection → localisation → quantification → prognosis). The 2024 SCSHM-DEIMC benchmark (Springer s13349-024-00846-1) explicitly showed that no current method has been fully verified in realistic operational/environmental conditions.
Standards and certification
What does and does not exist for graphene-enhanced concrete
Australian Standards. AS 3600:2018 (Amendment 2:2024) is the design code and does not explicitly treat nanomaterials. AS 1379 (specification and supply), AS 3972 (general-purpose cement), AS 3582.1-3 (SCMs — fly ash, slag, silica fume; nano-silica not included), AS 5100.5 (bridge design, enhanced durability) and AS 5100.7:2017 (the first formal SHM chapter for bridge assessment). ISO/TS 80004-1 defines nanomaterials (1–100 nm) but has no cement-specific provisions; ISO/TC 229 publishes ISO/TR 19733:2019 on graphene/2D material characterisation and ISO/TS 9651 (graphene classification, under development); ISO/TC 71 (concrete) has not yet issued a graphene-specific provision. RILEM Technical Committees on nano-cementitious materials remain the primary pre-standardisation venue. ASTM C09 relevant: C1856 (UHPC), C1609 (FRC flexural), C494 (admixtures — the likely path for graphene-PCE additives to seek classification). Eurocode 2 (EN 1992) and EN 206 have no nano-additive provisions. The standards gap for graphene-enhanced concrete is explicit and commercially material: no certified test method for (a) graphene dispersion quality in hardened cement, (b) piezoresistive gauge factor under realistic environmental cycling, (c) long-term durability of nano-enhanced concrete, or (d) EMI/electrical classification. Closing this gap is a defensible strategic objective for INFORM. Australian certification pathway: CodeMark (ABCB-accredited product certification for NCC compliance) for novel building products; NATA-accredited testing against AS test methods; state road-authority approval (TfNSW, DTP, TMR, MRWA) plus national harmonisation through Austroads; each authority typically requires 3–5 years of performance data before full acceptance. A pilot bridge deployment under Austroads supervision is plausibly the fastest credible path to TRL 7.
Key residual uncertainties (carried verbatim from the controlled brief)
What INFORM does not pretend to have solved
- (a) No independent replication of Tour-lab flash-graphene economics at > 100 t/yr.
- (b) No commercially certified self-sensing concrete product despite 15 years of research.
- (c) 2–4× spread in SHM market forecasts.
- (d) No Australian standard specifically addresses nano-additives to AS 3600 concrete.
- (e) Long-term environmental stability of graphene-cement gauge factor under Australian coastal / freeze-thaw conditions is not yet established at field scale.
Citation discipline
Note on this page
All quantitative anchors above are drawn from the INFORM controlled research brief (21 May 2026) which consolidates 2020–2026 peer-reviewed literature and industry sources across seven domains. The brief itself is held in the data room; this page is the curated public extract. DOIs are flagged for Project Lead confirmation before final publication. INFORM does not represent that any of the literature outcomes will be reproduced under INFORM batch conditions.