CO2 Mineralized Concrete Lab

Model ready-mix concrete CO2 mineralization batching, calcium ion reaction kinetics, nano-calcite crystallization, cement binder reduction, embodied carbon mitigation, and 10-year plant ROI.

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Facility Presets:
Net Value Added
+$0.00
per m³ poured
Annual Net Benefit
+$0k/yr
producer cash flow
Payback Period
0.0 Mo
skid capex payback
10-Yr Project NPV
$0.0M
@ 8% discount rate
CO2 Abated
0 t/yr
net annual reduction
Embodied Carbon
-0.0%
per yard of concrete
Batch Plant & Mix Design Controls
1. Ready-Mix Plant Production
80,000 m³
2. In-Batch CO2 Mineralization
%
%
%
%
3. Equipment Capex & Revenue Streams
%
%
Per-m³ Concrete Value Added Breakdown
CO2 Injection & Nano-Calcite Mineralization Process
Compressive Strength Development (MPa) vs Curing Age
10-Year Producer Cumulative Cash Flow & Payback
Technical & Financial Pro-Forma Summary
Concrete Materials & Carbon Abatement
Annual Concrete Production: 80,000 m³/year
Annual Cement Binder Saved: 1,496 tons/yr (18.7 kg/m³)
Permanent Mineralized CO2: 38.8 t CO2/yr (0.48 kg/m³)
Total Net Embodied CO2 Abated: 1,325 t CO2/yr
Direct Cement Cost Savings: +$2.52 / m³
Liquid CO2 Consumable Cost: -$0.08 / m³
Technology Licensing Fee: -$0.75 / m³
Commercial Green Concrete Premium: +$0.53 / m³
Puro/Verra CORC Carbon Credits: +$0.03 / m³
Plant Financial Performance & ROI
Skid & Cryo Tank Retrofit Capex: $120,000
Annual Cement Purchase Savings: $201,960/yr
Total Annual Gross Revenue / Benefit: $246,280/yr
Annual CO2 & Licensing Operating Expense: $66,528/yr
Net Annual Cash Flow (EBITDA): +$179,752/yr
Unlevered Project IRR: 149.8%
5x5 Sensitivity Matrix: Cement Cost vs. Binder Reduction Rate

Evaluates annual plant net cash flow ($k/yr) and skid capital payback period (months) across varying delivered cement commodity prices and achieved Portland cement binder reduction percentages.

Cement Cost \ Binder Saved 4.0% Reduction 5.0% Reduction 6.0% Reduction 7.0% Reduction 8.0% Reduction
Engineering Guide: Concrete Carbon Mineralization Chemistry
1. In-Batch Slurry Carbonation Chemistry

When ordinary Portland cement (OPC) is mixed with water, tricalcium silicate ($\text{C}_3\text{S}$) and dicalcium silicate ($\text{C}_2\text{S}$) begin hydrolyzing immediately, releasing calcium ions ($\text{Ca}^{2+}$) and hydroxide ions ($\text{OH}^-$) into the aqueous pore fluid, elevating pH above 12.5:

Ca²⁺ + 2OH⁻ + CO₂ → CaCO₃ (solid nano-calcite) + H₂O

Injected liquid $\text{CO}_2$ vaporizes and dissolves into the high-pH slurry within 60 to 90 seconds. Because calcium ions are abundant, $>95\%$ of the dissolved gas reacts to form thermodynamically stable, insoluble nano-scale calcium carbonate ($\text{CaCO}_3$) crystals. These nano-crystals act as nucleation seed sites, accelerating the subsequent precipitation of calcium silicate hydrate ($\text{C-S-H}$) gel and filling capillary micro-pores.

2. Strength Enhancement & Cement Reduction Economics

The pore refinement resulting from nano-calcite mineralization increases early (3-day and 7-day) and mature (28-day) compressive strength by 10% to 18%. This mechanical strength enhancement enables concrete batch plants to safely implement cement binder reduction:

  • Preserving Compressive Strength: Reducing cement content by 4% to 8% brings the 28-day strength back down to exact customer specifications (e.g. 4,000 psi), avoiding wasteful over-design.
  • Substantial Material Savings: Saving $15\text{ to }25\text{ kg}$ of cement per $\text{m}^3$ saves $\$2.00\text{ to }\$3.50/\text{m}^3$ in cement costs, easily surpassing the minor cost of liquid $\text{CO}_2$ ($\sim \$0.08/\text{m}^3$) and licensing royalties ($\sim \$0.75/\text{m}^3$).
  • Kiln Emission Displacement: For every ton of cement not manufactured, approximately $860\text{ kg of CO}_2$ kiln calcination and fossil fuel combustion emissions are avoided.
Formative Assessment: CO2 Concrete Mineralization Mastery
1. What primary chemical reaction takes place when liquid CO2 is injected into fresh ready-mix concrete during batching?
2. Why does in-batch CO2 mineralization allow concrete producers to reduce Portland cement content without sacrificing structural performance?
3. Why is the total carbon reduction per cubic meter (~16 kg CO2/m³) much larger than the direct amount of CO2 injected (~0.5 kg CO2/m³)?
4. What economic mechanism enables ready-mix batch plant retrofits to achieve payback periods of less than 12 months?
Frequently Asked Questions

Liquid CO2 is metered into the concrete mixing drum during batching. As soon as cement contacts water, calcium ions (Ca2+) rapidly dissolve into the pore fluid. The injected CO2 reacts almost instantaneously with these ions to precipitate insoluble, nano-scale calcium carbonate (CaCO3) crystals throughout the fresh cement paste.

The synthesized nano-calcite particles act as high-surface-area nucleation sites that accelerate early C-S-H gel hydration and refine the microstructure. This increases 28-day compressive strength by 10% to 15%, allowing concrete producers to safely reduce ordinary Portland cement (OPC) content by 4% to 8% while still meeting design strength specifications.

The carbon is permanently converted into solid stone (calcium carbonate, CaCO3). It is chemically and thermodynamically inert. Unlike gaseous storage, mineralized carbon cannot outgas, leak, or burn, remaining permanently sequestered for centuries even after building demolition and concrete crushing.

Because the retrofit consists only of a cryogenic liquid CO2 tank, telemetry injection skids, and automated flow controls ($80,000 to $160,000 capex), direct cement savings ($2.00 to $4.00 per cubic meter) pay back the initial capital investment in under 6 to 12 months for typical batch plants.

Producers generate dual revenue streams: certified carbon removal credits (CORCs) through registries like Puro.earth or Verra for direct permanent mineral trapping ($100 to $140/t CO2), and commercial green premiums ($1.50 to $3.50/m³) from developers seeking LEED v4.1 points and meeting municipal Buy Clean procurement standards.
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