Dry Particulate Geopolymer Composition Reducing Water Demand
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing geopolymer dry mixtures require a high amount of water for production, which is inefficient and may lead to incomplete reactions, and often have unsatisfactory mechanical properties due to insufficient amorphous aluminosilicate content and specific surface area.
Innovation Solution
A dry particulate composition comprising at least 45 wt.% amorphous aluminosilicate with a specific surface area product in the range of 7 to 15 m^2/g, combined with alkali metal hydroxide and alkali metal silicate, that can be easily mixed with limited water (less than 50 wt.%) at temperatures between 0°C and 100°C to form geopolymers with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid alkaline silicate is used to initiate polymerisation, then geopolymer formation occurs, but a very large amount of water is required which must subsequently be removed
Solution Approach 1:
The invention changes the physical state of the activating agent from liquid to dry particulate form. The dry particulate composition comprises alkali metal hydroxide and alkali metal silicate in dry particulate form, which when mixed with water, releases heat (exothermic reaction) to initiate geopolymerisation without requiring the large amounts of water needed for liquid alkaline silicate systems
Solution Approach 2:
The invention utilizes phase transition by converting the activating agent from liquid phase to solid particulate phase. The dry particulate composition maintains stability in solid form during storage and handling, then transitions to active form upon contact with water, initiating the geopolymerisation reaction through exothermic heat release
2Ease of manufacture
If existing dry mixture formulations are used, then storage and transport are simplified, but a high amount of water is still required for production
Solution Approach 1:
The invention creates a composite dry particulate composition combining alkali metal hydroxide, alkali metal silicate, and aluminosilicate in specific proportions. This composite formulation ensures that when mixed with limited water (less than 50 wt.%), the components work synergistically to produce complete geopolymerisation with satisfactory mechanical properties
Solution Approach 2:
The invention optimizes the water content parameter to less than 50 wt.%, which is significantly lower than conventional formulations. This parameter change, combined with the specific composition ratios, enables complete reaction without requiring the high water amounts needed by existing dry mixture technologies
3Device complexity
If insufficient amorphous aluminosilicate content is used, then material composition is simplified, but mechanical properties become unsatisfactory
Solution Approach 1:
The invention specifies that at least 45 wt.% of the aluminosilicate must be in amorphous state. This local quality requirement ensures sufficient reactivity and bond formation capability in the geopolymer matrix, directly contributing to satisfactory mechanical properties while maintaining composition simplicity
4Ease of manufacture
If specific surface area product is outside the optimal range, then material processing is simplified, but geopolymerisation reaction completeness is compromised
Solution Approach 1:
The invention defines a specific parameter range for the product of specific surface area (7 to 15 m²/g) that optimizes the reaction surface area available for geopolymerisation. This parameter control ensures complete reaction between components while maintaining practical processing simplicity
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 reduces water demand, simplifies on-site geopolymer production, and enhances mechanical properties by ensuring complete geopolymerization reactions, resulting in geopolymers with satisfactory cohesion and strength.
Implementation Method 1
a dissolution of a solid aluminosilicate by alkaline hydrolysis is the first reaction step and leads to the formation of aluminates and silicates
Implementation Method 2
a dissolution of a solid aluminosilicate by alkaline hydrolysis is the first reaction step
Implementation Method 3
a saturated solution is formed which leads to a network of oligomers that undergo polycondensation to form a three-dimensional network of aluminosilicates
Implementation Method 4
The geopolymerization reaction releases heat to drive the formation of the geopolymer product
Data Source
Figure 1
AI summary
The present invention relates to dry particulate composition for forming a geopolymer, comprising an alkali metal hydroxide, an alkali metal silicate, and an aluminosilicate. The invention further relates to methods for forming geopolymers and geopolymers formed according to said methods or using the said dry particulate compositions.