Carbon Cured Concrete Additives for CO2 Capture
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Solution Overview
Problem
The manufacturing of carbonated steel slag concrete products faces challenges in CO2 capture efficiency during curing, with traditional additives often negatively impacting the carbonation reaction and resulting in lower performance and material properties.
Innovation Solution
Incorporating additives such as calcium chloride, ground eggshells, sodium carbonate, sodium bicarbonate, fine calcium carbonate, calcium oxide, borax, and ammonium chloride into the concrete mixture to enhance CO2 capture and strength, while controlling the water-to-binder ratio and using carbon curing with CO2 gas to modulate the carbonation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional additives are used in carbonated steel slag concrete, then the concrete mixture can be formed and cured, but the CO2 capture efficiency during curing is reduced and material performance deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the concrete mixture by replacing traditional additives with specific alternative additives (ammonium chloride, borax, calcium oxide, calcium carbonate) that have different chemical properties. These parameter changes enable the carbonation reaction to proceed more efficiently, improving CO2 capture while maintaining concrete formation and curing capabilities.
Solution Approach 2:
The patent converts the previously harmful effect of additives on the carbonation reaction into a beneficial process. By selecting specific additives that promote carbonation, the patent transforms the additive function from hindering CO2 capture to enhancing it, thereby converting a harmful factor into a beneficial one that improves both CO2 capture efficiency and concrete strength.
2Strength
If the water-to-binder ratio is reduced to improve concrete strength, then the concrete becomes more durable, but the workability and forming process becomes more difficult
Solution Approach 1:
The patent introduces specific additives (ammonium chloride, borax, calcium oxide, calcium carbonate) as intermediary substances that mediate between the water-to-binder ratio and workability requirements. These additives enable the concrete to maintain lower water-to-binder ratios for improved strength while their chemical properties preserve adequate workability during the forming process, thus mediating the contradiction between strength and ease of operation.
Solution Approach 2:
The patent changes the chemical composition parameters of the concrete mixture by incorporating specific additives that modify the relationship between water-to-binder ratio and workability. These parameter changes allow the concrete to achieve optimal strength at lower water-to-binder ratios while maintaining sufficient workability, resolving the contradiction through chemical parameter optimization.
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
Significantly improves CO2 uptake and compressive strength of the concrete products, with additives like borax and ammonium chloride demonstrating substantial enhancements in CO2 capture and durability properties, including freeze-thaw resistance and abrasion resistance.
Implementation Method 1
carbon curing the concrete mixture to obtain the concrete product
Implementation Method 2
drying the formed concrete to obtain a dried concrete having a second water-to-binder ratio less than the first water-to-binder ratio
Data Source
AI summary
There is provided a method of manufacturing a concrete product. A composition including a slag-based binder, an aggregate, water and an additive selected from the group consisting of calcium chloride, ground eggshells, sodium carbonate, sodium bicarbonate, sodium hydroxide, fine calcium carbonate, calcium oxide, borax, ammonium chloride and combinations thereof, is mixed to obtain a concrete mixture. The concrete mixture is formed into a desired shape to obtain a formed concrete, the formed concrete having a first water-to-binder ratio. The formed concrete is dried to obtain a dried concrete having a second water-to-binder ratio less than the first water-to-binder ratio. The concrete mixture is carbon cured to obtain the concrete product.