Mechanism, Three Architectural Modes

Passive Cementitious Substrate

The passive mode disperses biomass-derived graphene and conductive carbon throughout the structural pour as an admixture component, without engineered macro-scale cell volumes. The cementitious matrix itself becomes the electrolyte-permeable medium; ionic conduction occurs through the natural pore network of the cured cement, while electronic conduction proceeds along percolation paths formed by the dispersed graphene phase. Charge separation arises at the dispersed graphene-electrolyte interfaces distributed throughout the bulk volume. The cured element exhibits modest but uniformly distributed energy density (target approximately 0.1 to 0.5 watt-hours per kilogram of structural material) and admits the simplest manufacturing path, a single mix-and-pour event executed with substantially conventional batching equipment and no special formwork. Per-kilowatt-hour cost is the lowest of the three modes because no incremental tooling is required; per-element capacity is correspondingly the lowest.

Engineered Cavity-Bath Substrate

The cavity-bath mode engineers explicit cell volumes within the structural element. Sacrificial or removable formwork inserts define the cavity geometry during the pour. After cure, the cavities are flooded with aqueous electrolyte to form discrete electrochemical cells whose walls are the surrounding cementitious matrix. Hollow non-corroding rebar, typically glass-fiber or basalt-fiber composite rebar with internal axial channels, performs dual structural and fluidic duty, both reinforcing the element against tensile and shear loads and serving as the electrolyte-distribution manifold that hydrates each cavity uniformly. Cavity ports at element edges admit electrolyte refresh, gas venting, and electrical-terminal exit. The cured element exhibits substantially higher energy density (target approximately 0.5 to 2 watt-hours per kilogram of structural material) at moderate manufacturing complexity.

Pre-Cast Modular Substrate Block

The modular-block mode productizes the architecture as factory-controlled stock-keeping units (SKUs). Each block is fabricated under tightly controlled cure conditions, temperature, humidity, and cure duration are instrumented and logged, with credentialed identity assigned at the manufacturing event and persisted through serialization, RFID, or equivalent identifier means. Blocks assemble in the field through standard masonry construction with conventional mortar joints and externally accessible electrical terminals at predefined block faces. The mode achieves the highest per-element energy density and the tightest credentialed-quality control, at the highest per-element manufacturing complexity. Blocks are the recommended mode for retrofits of existing buildings, where full reconstruction is uneconomic but selective wall replacement or non-structural infill addition is feasible.

Operating Parameters

The three modes occupy distinguishable operating envelopes. Passive substrate targets gravimetric energy density of approximately 0.1 to 0.5 Wh/kg of structural mass, with cycle life dominated by matrix aging rather than electrolyte degradation, and round-trip efficiency in the range typical of low-current cementitious cells. Cavity-bath substrate targets 0.5 to 2 Wh/kg with cycle life governed by electrolyte-refresh interval (refresh ports at element edges admit periodic replenishment without structural disturbance) and round-trip efficiency improved by the engineered ion-transport path. Modular blocks target the upper end of the achievable density envelope, constrained by block dimensional tolerances and the minimum mortar-joint thickness that preserves continuous electrical interconnection across the assembled wall.

Across all three modes, operating parameters of the cured element include: a state-of-charge field reported per element or per block; an admissibility credential bound to the element identity and refreshed on each governance event; structural load rating certified independently of electrochemical state; and an electrolyte-refresh schedule (passive: matrix-bound, no refresh; cavity-bath: scheduled refresh through edge ports; modular: factory-sealed with field-replaceable cartridge variant disclosed below). Thermal operating windows and freeze-thaw tolerance follow conventional cementitious limits, with the additional constraint that aqueous electrolyte phases must remain liquid across the deployment climate range.

Alternative Embodiments

Each of the three modes admits multiple alternative embodiments. The passive mode admits variants distinguished by graphene loading fraction, by choice of carbon precursor (lignin-derived, agricultural-residue-derived, or paired biomass streams), by admixture of supplementary conductive phases such as carbon nanotubes or carbon black, and by selection of cementitious binder (Portland, geopolymer, or alkali-activated). Cavity-bath embodiments vary in cavity geometry (cylindrical, prismatic, lenticular), in formwork-removal strategy (sacrificial dissolution, mechanical extraction, or in-place degradable insert), and in rebar channel topology (single-axis manifold, branched manifold, or fully interconnected lattice).

Modular-block embodiments include factory-sealed monolithic blocks, blocks with field-replaceable electrolyte cartridges accessed through a sealable face panel, blocks with integrated bus-bar interconnects that mate at mortar-joint interfaces, and blocks whose external dimensions match standard concrete-masonry-unit (CMU) form factors to admit substitution into existing masonry construction practice. Hybrid embodiments combine modes within a single element, for example, a pre-cast block whose interior carries cavity-bath cells while its exterior shell is passive cementitious substrate, exploiting the mechanical robustness of the passive shell to protect the higher-density cavity-bath core during transport and installation.

Composition, Mode Composition Within a Single Deployment

The three modes compose within a single building. Load-bearing walls, where structural mass is largest and capacity-per-element is most valuable, may use modular blocks for high-density storage with credentialed identity at every unit. Core columns and shear walls, where formwork access is straightforward during initial construction and the structural element is poured in place, may use cavity-bath substrate to capture the higher-density envelope without the per-block manufacturing overhead. Non-structural infill, partition walls, and topping slabs may use passive substrate to contribute distributed low-density capacity at minimal incremental cost.

Composition is governed by the credentialed admissibility profile of each element. Each element, block, poured cavity-bath section, or passive pour, carries an identity that distinguishes its mode and reports its operating envelope to a building-aggregated dispatch controller. The dispatch controller composes the per-element profiles into a building-level capacity, power, and admissibility manifest that the structural-engineering certification authority and the grid-interface authority each consume. Mode composition is therefore not a deployment heuristic but a governance primitive of the architecture: the same dispatch and credentialing logic operates across modes, with mode-specific parameters supplied by the element identity.

Manufacturing and Deployment Economics

The three modes occupy distinct points on the cost-versus-capacity surface, and the disclosure contemplates that mode selection in any specific deployment is governed by the relative weights placed on per-kilowatt-hour cost, per-element capacity, manufacturing complexity, field-installation logistics, and credentialing rigor. Passive substrate carries the lowest incremental cost over conventional cementitious construction because the only added input is the biomass-derived conductive admixture and its dispersion into a conventional batch. The marginal manufacturing process is essentially that of admixture-modified concrete, well within the operating envelope of existing ready-mix infrastructure. The trade is energy density: passive elements deliver capacity proportional to their structural mass at modest gravimetric density.

Cavity-bath substrate carries higher per-element manufacturing cost because of the formwork-insert apparatus, the hollow non-corroding rebar, the post-cure flooding operation, and the cavity-port termination hardware. In compensation, the per-element capacity is several-fold that of the passive mode, and the engineered cavity geometry admits a level of cell-level uniformity that the passive mode cannot reach. Cavity-bath construction is best suited to new construction where the formwork sequence can be planned around the cavity inserts and where the structural designer's load-path layout naturally accommodates the cavity-defined element thicknesses.

Modular blocks carry the highest per-unit manufacturing cost because the cure conditions, the credentialing apparatus, and the dimensional-tolerance regime are all factory-controlled. The compensating advantages are the highest per-element capacity, the tightest credentialed-quality envelope, and the field-installation profile that matches conventional masonry construction practice. The mode is uniquely suited to retrofit deployments, where new poured-in-place construction is uneconomic but selective wall replacement, partition addition, or non-structural infill installation is feasible. The block form factor also admits supply-chain economies, centralized manufacturing, standardized SKU catalogs, and conventional masonry-supply distribution channels, that the poured-in-place modes do not.

Credentialed Identity Across Modes

Each of the three modes carries credentialed identity, but the credentialing event is staged differently. For passive substrate, the credentialed identity attaches to the structural element as a whole at the time of the pour, with a record of admixture batch identity, conductive-phase loading, and cure conditions. The element's credentialed admissibility profile is conservative because the per-element internal uniformity is not directly measured; the building-aggregated dispatch controller treats the element as a single distributed-density volume.

For cavity-bath substrate, the credentialed identity attaches at the cavity level as well as at the element level. Each cavity carries a per-cavity record covering its formwork-defined volume, its electrolyte fill-batch identity, and its rebar-channel routing. The aggregated element-level credential composes the per-cavity records into a per-element manifest that the dispatch controller consumes. For modular blocks, credentialed identity attaches at the SKU level under controlled cure conditions; each block carries a serialized identifier, a factory-test record, and a per-block admissibility profile that travels with the block through transport, storage, installation, and operational lifetime. Field-installation records bind block identifiers to wall positions, admitting per-position telemetry and per-position end-of-life replacement.

Across all three modes, the credentialed identity is the keying mechanism through which structural-engineering certification, electrochemical-state telemetry, and grid-interface dispatch each address the element. The disclosure contemplates that the same building, populated with elements from multiple modes, presents to all three authorities a single identity-keyed manifest in which mode-specific differences are abstracted behind a uniform addressing scheme.

Prior-Art Distinction

Prior cementitious-storage disclosures generally describe a single architectural mode, typically a passive admixture approach without engineered cell volumes, and do not contemplate the three-mode class structure or the mode-composition logic disclosed here. Prior structural-battery work in the polymer-composite domain (carbon-fiber-reinforced laminates with embedded electrolyte) addresses transportation-mass applications and does not translate to building-scale cementitious construction. Prior pre-cast concrete masonry products carry no electrochemical function. The three-mode taxonomy, the dual-duty hollow non-corroding rebar of the cavity-bath mode, the credentialed manufacturing event of the modular-block mode, and the building-aggregated mode-composition dispatch are jointly novel relative to the searched prior art.

Disclosure Scope

This disclosure encompasses each of the three modes individually, every pairwise composition of modes within a single structural element or single building, and the building-aggregated dispatch and credentialing logic that governs the composed deployment. Claims of corresponding scope are contemplated to the passive substrate, the cavity-bath substrate including its dual-duty rebar manifold, the pre-cast modular block including its credentialed manufacturing event, and the methods of composing the three modes within a single deployment. Equivalent embodiments employing alternative biomass-derived conductive phases, alternative cementitious binders, alternative cavity-defining formwork strategies, and alternative block form factors are within the scope of the disclosure.