Carbonized Recycled Concrete Powder Bricks Without Sintering
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Solution Overview
Problem
The recycling of fine recycled concrete powders from waste concrete is inefficient, leading to resource waste and air pollution, while traditional brick manufacturing processes emit high levels of pollutants and have low carbon dioxide storage rates.
Innovation Solution
A method using industrial solid waste as a calcium source, reacting carbonate ions from industrial waste gas with calcium ions to form a calcium bicarbonate solution, which is then used to produce a carbonized brick with high carbon dioxide storage and strength through a liquid phase carbonation process without calcination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional sintering process is used to manufacture bricks, then brick strength is achieved, but high air pollutant emissions occur
Solution Approach 1:
The patent converts harmful CO2 emissions into beneficial calcium carbonate through carbonation reaction. Industrial waste gas containing CO2 is introduced to react with calcium hydroxide in the brick matrix, transforming the greenhouse gas into a strength-providing mineral component, thereby eliminating pollution while achieving brick strength.
Solution Approach 2:
The patent changes the chemical parameters of the brick by introducing CO2 to induce carbonation reaction. The chemical composition transforms from calcium hydroxide (Ca(OH)2) to calcium carbonate (CaCO3), fundamentally altering the material properties to achieve strength without sintering and simultaneously capturing carbon.
2Quantity of substance
If carbonized maintenance technology is used for carbonated bricks, then carbon dioxide capture is achieved, but production time is prolonged and storage rate is low
Solution Approach 1:
The patent performs preliminary carbonation by introducing CO2 during the brick manufacturing process itself, rather than requiring subsequent maintenance carbonation. The CO2 is incorporated into the brick matrix during formation, enabling immediate carbon capture and eliminating the need for prolonged post-processing carbonization.
Solution Approach 2:
The patent establishes continuous carbonation by maintaining CO2 introduction throughout the brick production process. The carbonation reaction occurs continuously during manufacturing, ensuring sustained CO2 capture and conversion into calcium carbonate, thereby achieving both high storage rate and efficient production.
3Loss of substance
If fine recycled concrete powders are discarded, then resource waste occurs, but air pollution is caused by floating particles
Solution Approach 1:
The patent recovers fine recycled concrete powders that would otherwise be discarded. The powders are incorporated as the base material for carbonated bricks, transforming waste into a valuable construction resource. The carbonation process further enhances the powders by converting them into calcium carbonate-rich composite material with improved properties.
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 enhances carbon dioxide fixation and resource recycling, producing an environmentally friendly brick with high strength and efficiency, meeting national standards and reducing greenhouse gas emissions.
Implementation Method 1
reacting carbonate ions produced by dissolving industrial waste gas containing carbon dioxide in water with calcium ions leached form industrial solid waste to prepare a calcium bicarbonate solution based on the principle of liquid phase carbonation technology
Implementation Method 2
heating to decompose the calcium bicarbonate solution to generate carbon dioxide, allowing the carbon dioxide generated to react with calcium ions
Implementation Method 3
produce calcium carbonate, followed by precipitating, crystallizing and cementing the recycled powders
Implementation Method 4
precipitating, crystallizing and cementing the recycled powders in the molding die together with the calcium carbonate
Implementation Method 5
carbonized maintenance technology, which involves slow diffusion of carbon dioxide into the concrete matrix
Data Source
AI summary
A carbonized brick of recycled concrete powders and a preparation method thereof are provided, belonging to the field of concrete materials. The preparation method includes: adding composition A to a liquid storage tank; introducing composition B into the liquid storage tank to react with a solid waste solution to generate calcium bicarbonate solution; filling recycled powders into a molding die, decomposing the calcium bicarbonate solution by heat, reacting generated carbon dioxide with calcium ions leached from a C—S—H gel in the recycled powders to produce calcium carbonate, and precipitating, crystallizing and cementing in the molding die together with calcium carbonate produced by decomposing calcium bicarbonate solution, and resulting in strength of the recycled powders.