CO2-Cured Slag-Based Concrete Casting Without Portland Cement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Metallurgical slag, particularly steel slag, is often landfilled and underutilized, and traditional concrete production relies heavily on Portland cement, which contributes to greenhouse gas emissions and depletes natural resources.
Innovation Solution
A method of producing wet-cast slag-based concrete using metallurgical slag as the main binder and curing it with carbon dioxide, eliminating the need for additional heat or steam, and optionally reinforcing it with materials like carbon steel or FRP bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metallurgical slag is landfilled, then waste management is simplified, but resource utilization is reduced and environmental harm increases
Solution Approach 1:
The patent converts metallurgical slag from a harmful waste material requiring landfilling into a beneficial binder material for concrete production. The slag is processed and used as the main binding agent, transforming an environmental problem into a resource utilization solution that reduces greenhouse gas emissions and landfill dependency.
Solution Approach 2:
Instead of discarding metallurgical slag in landfills, the patent recovers and reuses it as a valuable binder material. The slag is processed through carbonation and mixing with aggregates to create concrete products, thereby recovering a resource that would otherwise be wasted and causing environmental harm.
2Strength
If Portland cement is used for concrete production, then mechanical strength is achieved, but greenhouse gas emissions increase and natural resources are depleted
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using metallurgical slag instead of Portland cement. The slag undergoes carbonation processing to activate its binding properties, creating a cementitious material that achieves comparable mechanical strength without the high greenhouse gas emissions associated with traditional cement production.
Solution Approach 2:
The patent creates a composite binder system combining metallurgical slag with carbon dioxide through carbonation processing. This composite material achieves the binding properties of Portland cement while utilizing industrial waste and sequestering CO2, thereby reducing both emissions and natural resource consumption.
3Productivity
If wet-cast method is used with slag-based binder, then production efficiency is increased, but water to binder ratio control becomes critical
Solution Approach 1:
The patent applies preliminary carbonation processing to the metallurgical slag before mixing with aggregates and water. This pre-treatment activates the binding properties of the slag and stabilizes its water absorption characteristics, making the subsequent wet-cast process more controllable and efficient with consistent water to binder ratios.
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 products with mechanical and durability properties comparable to traditional cement-based products while reducing greenhouse gas emissions and natural resource consumption, and increases production efficiency.
Implementation Method 1
curing the demoulded conditioned slag-based intermediate with carbon dioxide to activate the conditioned slag-based intermediate and produce the wet-cast slag-based concrete product
Data Source
AI summary
The present description relates to a method of producing a wet-cast slag-based concrete product particularly where the wet-cast slag-based concrete product is partially or completely set inside a mould, pre-conditioned outside of the mould and then cured with carbon dioxide in a curing chamber. The wet-cast slag-based concrete product is optionally reinforced.