Geopolymer Cement Non-Corrosive Formulation
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Solution Overview
Problem
Geopolymeric cements are classified as corrosive due to high alkaline silicate solutions, posing handling risks, and existing solutions struggle to balance water content for mechanical strength and workability, leading to suboptimal cement properties.
Innovation Solution
A geopolymeric cement formulation using a mixture of metakaolin and non-thermally activated aluminosilicate with an alkaline silicate solution at a specific molar ratio (0.51 to 0.60) and a crosslinked acrylic acid polymer superplasticizer, reducing water content while maintaining mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an alkaline silicate solution with high M2O:SiO2 ratio is used to activate geopolymerization, then the cement achieves sufficient mechanical strength, but the cement is classified as corrosive and poses handling risks
Solution Approach 1:
The invention changes the key parameter of the alkaline silicate solution from a high M2O:SiO2 ratio (>0.625) to a low M2O:SiO2 ratio (0.3-0.625). This parameter change transforms the cement classification from corrosive to irritant, eliminating handling risks while maintaining mechanical strength through optimized composition ratios of metakaolin, silica fume, and the alkaline activator
Solution Approach 2:
The invention uses a composite approach by combining metakaolin with silica fume in specific proportions (40-60% metakaolin, 40-60% silica fume by weight). This composite material system allows the use of lower M2O:SiO2 ratio alkaline solutions while achieving sufficient mechanical strength, as the silica fume contributes to the geopolymer structure and strength development
2Ease of operation
If the quantity of alkaline silicate solution is increased to improve workability and fluidity, then the cement becomes more workable, but the mechanical strength of the cement is reduced
Solution Approach 1:
The invention changes the M2O:SiO2 ratio parameter of the alkaline silicate solution to a low range (0.3-0.625), which fundamentally alters the water-binder interaction. This allows the use of sufficient activator solution for workability without the strength penalty associated with high-ratio solutions, as the lower M2O:SiO2 ratio produces a denser, stronger geopolymer matrix
Solution Approach 2:
The composite system of metakaolin and silica fume creates a dual-function material where silica fume acts as both a filler and a strength-contributing phase. This composite approach enables the formulation to tolerate higher water content from the alkaline solution for workability while the silica fume ensures adequate mechanical strength through pozzolanic reactions and filler effects
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 solution results in a non-corrosive geopolymeric cement with improved mechanical strength, workability, and reduced environmental impact, classified as an irritant rather than corrosive, and lowers production costs.
Implementation Method 1
geopolymeric cements because they are based on mineral geopolymer formed by the polymerization of aluminosilicate oxides in the presence of an alkaline activator
Implementation Method 2
A geopolymeric cement formulation using a mixture of metakaolin and non-thermally activated aluminosilicate with an alkaline silicate solution at a specific molar ratio (0.51 to 0.60) and a crosslinked acrylic acid polymer superplasticizer, reducing water content while maintaining mechanical properties
Data Source
AI summary
The present invention relates to a novel type of non-corrosive geopolymer cement in which said cement comprises a metakaolin or a mixture of metakaolin and of an aluminosilicate that is not thermally activated, in a weight ratio within the range extending from around 40:60 to around 80:20, and an alkaline silicate solution having an M2O:SiO2 molar ratio within the range extending from 0.51 to 0.60, M representing Na or K and also the use of a superplasticizer comprising a crosslinked polymer of acrylic acid in the manufacture of geopolymer cement.