Lime-Soil Carbon Mineralization for Stronger CO2 Sequestration
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Solution Overview
Problem
Current methods for reducing carbon emissions from construction materials like cement have limited success in capturing and sequestering carbon dioxide, with a majority of introduced CO2 being released into the atmosphere, and are not economically sustainable.
Innovation Solution
A method involving the addition of lime and carbon dioxide to soil columns to enhance carbon dioxide uptake through pozzolanic reactions, using lime to react with clay minerals and form cementitious products, potentially combined with binders like cement and supplementary cementitious materials (SCM) to strengthen the soil and trap CO2.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If recycled carbon dioxide is introduced into fresh concrete or calcium oxide is blended with carbon dioxide, then carbon dioxide uptake is increased, but the majority of carbon dioxide is still released to the atmosphere and capture efficiency remains low
Solution Approach 1:
The patent introduces an intermediary substance (lime or calcium oxide) that mediates between carbon dioxide and the concrete matrix. This intermediary reacts with carbon dioxide to form calcium carbonate, significantly improving capture efficiency. The intermediary substance facilitates the chemical reaction that transforms gaseous CO2 into solid carbonate, solving the problem of low capture efficiency.
Solution Approach 2:
The patent changes the chemical parameters of the concrete mixture by adding lime or calcium oxide, which alters the reactivity and carbonation characteristics. This parameter change enables more effective carbon dioxide capture and storage, transforming the concrete from a passive material to an active carbonation system that reliably sequesters CO2.
2Quantity of substance
If current carbon sequestration methods are used, then some carbon dioxide is captured, but the solutions are not economically sustainable
Solution Approach 1:
The patent employs self-service mechanisms where the lime or calcium oxide reacts autonomously with carbon dioxide in the concrete mixture. The process occurs naturally during concrete curing without requiring external energy input or complex systems. This self-service approach eliminates additional operational costs, making the carbon sequestration economically sustainable while maintaining effective CO2 capture.
3Strength
If lime and carbon dioxide are added to soil columns, then carbon dioxide uptake and soil strength are increased, but the process requires specific material combinations and processing
Solution Approach 1:
The patent merges multiple functions into a single treatment process by combining lime addition, carbon dioxide introduction, and soil stabilization into one integrated operation. This merging achieves both carbon sequestration and soil strengthening simultaneously, reducing the need for separate treatment processes and simplifying the overall implementation while maintaining effective material interactions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method increases carbon dioxide uptake and soil strength by up to 20%, providing a more sustainable solution for carbon sequestration while maintaining or improving construction material properties.
Implementation Method 1
adding lime and carbon dioxide to a soil column including soil to form treated soil
Implementation Method 2
enhance carbon dioxide uptake through pozzolanic reactions, using lime to react with clay minerals and form cementitious products
Data Source
AI summary
Methods, systems and compositions for storing carbon dioxide in soil are disclosed herein. In some embodiments, the composition comprises at least 35% of cement by weight of the composition; 1-15% of lime by weight of the composition; at least 5% of a supplementary cementitious material (SCM) by weight of the composition; and carbon dioxide, wherein a weight by composition of the carbon dioxide is less than 5%. The composition can further comprise at least 35% of calcium carbonate by weight of the composition.