Carbonation Reactor for Concrete Curing
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Solution Overview
Problem
The production of conventional concrete contributes significantly to greenhouse gas emissions due to the calcination of carbonate rocks during cement manufacturing, and low-carbon binders used as alternatives often result in concrete composites with weaker material properties, making them unsuitable for most building applications.
Innovation Solution
A method and system for carbonation curing of concrete composites using a carbonation reactor that reacts concrete precursors with a CO2-rich gas stream, optimizing temperature, relative humidity, and gas flow rate to achieve a carbonation rate constant of at least 0.005, thereby forming carbonated concrete composites with similar properties to traditional concrete while reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cement manufacturing is used, then concrete strength and material properties are achieved, but greenhouse gas emissions increase significantly
Solution Approach 1:
The patent captures waste CO2 emissions from industrial sources and converts this harmful greenhouse gas into a beneficial curing agent for concrete. The CO2 is injected into the concrete matrix where it reacts with calcium hydroxide to form calcium carbonate, strengthening the concrete while sequestering the CO2 permanently.
Solution Approach 2:
The system recovers CO2 that would otherwise be discarded into the atmosphere. By capturing CO2 from industrial flue gases or other emission sources and utilizing it for concrete curing, the process transforms a waste product into a valuable resource, simultaneously reducing emissions and improving concrete performance.
2Object-generated harmful factors
If low-carbon binders are used to reduce emissions, then greenhouse gas emissions decrease, but concrete strength and material properties deteriorate
Solution Approach 1:
The patent changes the curing parameters by introducing controlled CO2 exposure. This chemical parameter change triggers carbonation reactions that precipitate calcium carbonate crystals, which fill pores and strengthen the concrete matrix. This allows low-carbon binders to achieve strength levels comparable to conventional cement-based concretes.
Solution Approach 2:
The process creates a composite structure within the concrete by forming calcium carbonate crystals throughout the binder matrix. This composite approach, where the carbonated binder combines with aggregates, produces a material with enhanced mechanical properties that compensates for using lower-carbon binder materials.
3Object-generated harmful factors
If carbonation curing is implemented, then CO2 emissions are reduced and material properties are maintained, but process complexity increases
Solution Approach 1:
The carbonation reactor is designed to perform multiple functions: it serves as both the mixing container and the curing chamber, and the CO2 injection system also functions as the sealing mechanism. This multi-functionality reduces the number of separate components needed, simplifying the overall system despite the advanced curing process.
Solution Approach 2:
The concrete mixture itself provides the sealing function during carbonation curing. The plastic concrete seals the reactor chamber, eliminating the need for separate gaskets or sealing mechanisms. The system uses its own material properties to achieve the sealing required for pressurized CO2 injection.
4Object-generated harmful factors
If carbonation curing is implemented, then embodied carbon intensity is reduced, but manufacturing process time increases
Solution Approach 1:
The concrete is prepared with pre-carbonation capabilities during mixing, with the binder formulation optimized to react rapidly with CO2. This preliminary preparation allows the carbonation curing process to proceed much faster than traditional curing methods, reducing the overall time required to achieve sufficient strength.
Solution Approach 2:
The carbonation curing process uses periodic CO2 injection cycles rather than continuous exposure. The CO2 is injected in controlled pulses or stages, allowing the concrete to absorb and react with the gas efficiently. This periodic approach maintains high carbonation rates while reducing total process time compared to sustained low-pressure exposure.
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 produces concrete composites with reduced embodied carbon intensity and comparable material properties to traditional concrete, utilizing waste CO2 for curing and incorporating industrial solid wastes, thus addressing both environmental impact and material performance.
Implementation Method 1
react the concrete precursor with the gas stream and form the carbonated concrete composite
Data Source
AI summary
Provided herein are systems for carbonation curing and CO2 mineralization of concrete composites and methods of manufacturing a carbonated concrete composite. A method of manufacturing a carbonated concrete composites includes contacting concrete with CO2-containing gas streams in the carbonation reactor having a gas stream inlet and an outlet to provide optimal gas flow distribution and gas velocity. The concrete precursor includes a binder, one or more aggregates, and water. A gas stream is received at the carbonation reactor. The gas stream includes carbon dioxide. The concrete precursor is maintained at a suitable temperature in the carbonation reactor to thereby react the concrete precursor with the gas stream to produce carbonate minerals in the carbonated concrete composite.