Solidified Body CO2 Fixation via Pre-carbonated Slag
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Solution Overview
Problem
Existing methods for manufacturing carbonated solidified bodies using CO2 fixation require lengthy deaeration and carbonation processes in airtight containers, which are burdensome and difficult to achieve complete carbonation.
Innovation Solution
A solidified body comprising a binder, carbonated steelmaking slag, wood material, synthetic resin, or natural fibers, with specific content percentages, is manufactured through a kneading and hydration process without deaeration or carbonation in an airtight container, fixing CO2 through a hydration reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a deaeration and carbonation process is performed in an airtight container, then CO2 fixation is achieved, but the process requires long time and heavy burden
Solution Approach 1:
The steelmaking slag is pre-carbonated before being used as aggregate in the concrete. This preliminary carbonation action occurs during the steelmaking process itself, where CO2 is already fixed in the slag material. By preparing the carbonated aggregate in advance, the patent eliminates the need for subsequent deaeration and carbonation processes in airtight containers, significantly reducing process time while maintaining CO2 fixation benefits
Solution Approach 2:
The patent extracts and removes the problematic deaeration and carbonation steps from the concrete manufacturing process. By using pre-carbonated steelmaking slag as aggregate, the method takes out the time-consuming airtight container processes entirely, keeping only the essential mixing and curing steps that can be performed under normal atmospheric conditions
2Quantity of substance
If a deaeration and carbonation process is performed in an airtight container, then CO2 fixation is achieved, but it is difficult to entirely carbonate the inside of the solidified body
Solution Approach 1:
The steelmaking slag undergoes carbonation action during the steelmaking process before being incorporated into the concrete. This preliminary carbonation ensures that the aggregate material itself already contains fixed CO2, eliminating the need for subsequent carbonation of the cured concrete interior. The carbonation action occurs when the slag is molten and highly reactive, ensuring complete and uniform CO2 fixation in the aggregate particles
Solution Approach 2:
The steelmaking slag acts as an intermediary carrier of fixed CO2. Instead of attempting to carbonate the entire concrete structure directly, the patent uses the slag as a mediating material that has already absorbed and fixed CO2 during steelmaking. This intermediary approach allows CO2 fixation to occur in a controlled manner during steelmaking, ensuring complete carbonation of the aggregate before it becomes part of the concrete matrix
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 allows for efficient CO2 fixation in the solidified body, eliminating the need for deaeration and carbonation processes, and enables production of materials like seawalls, foot protection, and roadbeds with enhanced properties such as heat insulation and fire resistance.
Implementation Method 1
A solidified body is manufactured by solidifying, with a hydrate, a binder and a raw material capable of fixing carbon
Data Source
AI summary
[Object] To provide a solidified body and a method for manufacturing a solidified body which can fix CO2 without performing a deaeration process and a carbonation process in an airtight container. [Solution] A solidified body includes: a binder; at least one of a carbonated steelmaking slag, a wood material, a synthetic resin, and natural fibers; and water, wherein the content of the at least one of a carbonated steelmaking slag, a wood material, a synthetic resin, and natural fibers is not less than 1 mass % and not more than 90 mass %.