Powder Geopolymer Mixture for High-Strength On-Site Solidification
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Solution Overview
Problem
Conventional geopolymer production methods require dedicated facilities for handling high-viscosity alkali solutions, leading to time-consuming temperature control and mixing processes, and result in geopolymer compositions with inferior strength compared to cement concrete.
Innovation Solution
A powder mixture composed of an active filler and alkali powder, including sodium metasilicate or a combination of sodium metasilicate and sodium hydroxide or potassium hydroxide, with a molar ratio of (Na+K)/Al > 0.7, is used to form geopolymer solidified bodies by mixing with water or aggregate at the site, replacing the need for alkali solutions and enhancing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional alkali solutions (aqueous sodium silicate or potassium silicate) are used in geopolymer production, then the geopolymer composition can be formed, but the alkali solution has high viscosity and poor flowability requiring dedicated facilities and time-consuming temperature control and mixing
Solution Approach 1:
The invention changes the physical state of the alkali activator from liquid (aqueous solution) to solid (anhydrous powder). This parameter change fundamentally alters the flowability characteristics - solid powder has no viscosity and can be easily transported and stored without dedicated liquid handling facilities, directly resolving the contradiction between flowability and device complexity
Solution Approach 2:
The invention replaces expensive, specialized liquid handling facilities with simple, inexpensive powder handling equipment. Anhydrous alkali powders can be stored in ordinary containers and transported using standard bulk material handling equipment, eliminating the need for specialized viscous liquid storage tanks, heating systems, and pumping facilities
2Productivity
If conventional alkali solutions are used, then geopolymer composition can be produced, but it takes a long time for temperature control, weight measurement, stirring, and mixing
Solution Approach 1:
Changing the alkali activator from liquid to solid form eliminates the need for temperature control during handling and mixing operations. Solid powders do not require heating or cooling to maintain flowability, directly reducing the time loss associated with temperature management and accelerating the overall production process
Solution Approach 2:
The invention extracts the temperature control requirement from the alkali activator handling process. By using anhydrous powder instead of aqueous solution, the temperature sensitivity inherent in liquid handling is eliminated, allowing direct mixing without preliminary temperature adjustment steps
3Ease of operation
If active filler and sodium metasilicate powder are used as alternative to alkali solution, then handling is improved, but the geopolymer composition produced has inferior strength
Solution Approach 1:
The invention uses composite alkali powder formulations containing multiple components (sodium metasilicate, sodium hydroxide, potassium hydroxide, and optionally other alkali metal compounds) in specific ratios. This composite approach combines the handling advantages of powder form with the strength-enhancing chemical properties of multiple alkali sources, simultaneously achieving ease of operation and high strength
Solution Approach 2:
The invention optimizes the chemical composition parameters of the alkali powder, specifically controlling the molar ratios of Na/K to Al and Si to Al, to ensure sufficient alkalinity and silicate content for strong geopolymer formation. This parameter optimization allows the use of powder form while maintaining or enhancing strength compared to conventional liquid alkali solutions
4Strength
If conventional alkali solutions are used, then geopolymer concrete can be produced, but large storage facilities and expensive materials are required
Solution Approach 1:
The invention changes the concentration and physical form of the alkali activator to anhydrous powder, which has higher alkali content per unit volume and mass compared to aqueous solutions. This parameter change reduces the total quantity of material required to achieve the same alkalinity, reducing both storage space requirements and material costs while maintaining the strength of the geopolymer concrete
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
This approach allows for easy on-site formation of high-strength geopolymer solidified bodies, reducing the need for large storage facilities and expensive alkali solutions, while improving strength and reaction speed.
Implementation Method 1
a geopolymer composition is a solidified body obtained by mixing and reacting an alkali-active amorphous powder (active filler) such as fly ash (coal ash), metakaolin, and blast furnace slag, with an alkali solution for activating it
Data Source
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AI summary
Provided is a powder mixture capable of easily forming a geopolymer solidified body at a site and of producing a geopolymer solidified body having high strength. The geopolymer solidified body is made to be formed by adding water or with water and aggregate to a powder mixture obtained by mixing an active filler and an alkali powder, thus a geopolymer solidified body can be formed by bringing the powder mixture previously prepared into a site and mixing the powder mixture with water or with water and aggregate at the site. Further, any one of a powder of sodium metasilicate, a powder of sodium metasilicate and sodium hydroxide, and a powder of sodium metasilicate and potassium hydroxide is made to be used as an alkali powder of the powder mixture, and therefore geopolymer concrete having high strength can be formed.