Geopolymer Concrete Components with Semi-Dry Pressure Curing
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Solution Overview
Problem
Current methods for producing Geopolymer concrete face inefficiencies in activating the geopolymerization process due to high moisture content, leading to incomplete reactions and increased production costs, while traditional concrete contributes significantly to CO2 emissions and lacks durability in marine environments.
Innovation Solution
A semi-dry mixing process using fly ash with an alkaline activator, followed by pressure shaping and controlled heating, enhances geopolymerization, increasing density and bonding, and incorporates aggregates to produce high-strength, durable concrete components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wet mixing technology is used to produce Geopolymer concrete, then the mixing process is easier to perform, but the high moisture content prevents complete geopolymerization activation at high temperatures and causes cracking during drying
Solution Approach 1:
The patent changes the water content parameter from high (wet mixing) to low (semi-dry mixing, 5-15% water by weight of fly ash), enabling the mixture to withstand high-temperature drying (up to 250°C) without cracking while allowing complete geopolymerization activation
Solution Approach 2:
The patent utilizes the phase transition of water during controlled drying, gradually removing moisture at optimized temperature stages to prevent sudden steam generation and cracking, thereby transforming the mixture from semi-dry to fully dried state while maintaining structural integrity
2Ease of manufacture
If traditional Portland cement concrete is used, then the production process is well-established, but it generates large amounts of CO2 emissions and lacks durability in marine environments
Solution Approach 1:
The patent replaces Portland cement with fly ash (industrial waste) as the primary binder material, changing the chemical composition parameter to eliminate CO2-generating cement production while utilizing alkaline activators to trigger geopolymerization reactions in the fly ash
Solution Approach 2:
The patent converts fly ash, which is an environmental pollutant requiring landfill disposal, into a valuable building material through geopolymerization, transforming waste into a durable, CO2-free concrete alternative that also possesses CO2 absorption capabilities
3Ease of manufacture
If fly ash is disposed of through landfilling, then the disposal process is simple, but it causes air pollution and land resource wastage
Solution Approach 1:
The patent transforms fly ash from a harmful waste material requiring landfill disposal into a beneficial building material through geopolymerization, eliminating the need for landfilling and converting an air pollutant into a durable construction component
Solution Approach 2:
The patent recovers fly ash from waste streams and reuses it as the primary binder in Geopolymer concrete production, preventing its disposal through landfilling and eliminating associated environmental harms
4Stability of the object's composition
If low drying temperature (not exceeding 80°C) is used to prevent cracking, then the product structure remains intact, but the geopolymerization process is incomplete and product quality is reduced
Solution Approach 1:
The patent changes the drying temperature parameter from low (≤80°C) to high (up to 250°C) by first optimizing the semi-dry mixture composition with reduced water content, enabling the structure to withstand high temperatures without cracking while completing geopolymerization
Solution Approach 2:
The patent performs preliminary semi-dry mixing with optimized water content (5-15%) before drying, creating a pre-conditioned mixture that can tolerate high-temperature drying without cracking, thereby enabling subsequent complete geopolymerization activation
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 high-strength, environmentally friendly concrete components with improved load-bearing capacity and extended lifespan, capable of CO2 adsorption, suitable for various construction applications, and reduces waste by utilizing industrial by-products.
Implementation Method 1
mixing the alkaline activator with the entire amount of water to form an alkaline activator solution, then uniformly mixing this solution with the fly ash to form Geopolymer mortar
Implementation Method 2
shaping the Geopolymer mortar using a pressure greater than 1 atm, into the desired size and shape
Implementation Method 3
curing by drying at a temperature of 60° C. to 250° C. to obtain construction components from fly ash
Implementation Method 4
shaping the Geopolymer mortar using a pressure greater than 1 atm, into the desired size and shape, wherein the shaping is performed by methods such as hydraulic pressing, extrusion, rolling, centrifugal casting, vibration, vibration pressing
Data Source
AI summary
This invention relates to a method for producing construction components from Geopolymer materials, primarily using fly ash, which can be partially or fully replaced by other materials such as metakaolin, zeolite, rice husk ash, red mud, or industrial by-products. The method involves preparing a mixture of fly ash or Geopolymer materials (80-99.75% by weight), an alkaline activator (0.25-20%), and water (6-30%). The alkaline activator is mixed with water and fly ash to form Geopolymer mortar, which is shaped using methods such as hydraulic pressing, extrusion, rolling, or vibration. The product is cured by drying at temperatures from 60° C. to 250° C. This technology allows for the creation of various construction components, including bricks, panels, pipes, and beams, while enabling the absorption of greenhouse gases like CO2 and CH4, thus promoting environmental protection. Enhancing additives can be included to improve mechanical properties and durability.