Catalyst Composition for Cement Reactivity
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Solution Overview
Problem
Existing cement compositions, such as those disclosed in EP 1 349 819, do not achieve sufficient reactivity for certain applications, leading to suboptimal performance in high-demanding scenarios like oil well cementing and soil stabilization.
Innovation Solution
A catalyst composition comprising chlorides like ammonium chloride and metal oxides, particularly magnesium oxide, is introduced to enhance the reactivity of cement components, preventing deactivation and maintaining high reactivity by mixing the catalyst separately just before use, thereby improving the energetic value and binding properties of cement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing cement compositions are used, then the composition is stable and easy to manufacture, but the reactivity is insufficient for certain applications
Solution Approach 1:
The cement composition is segmented into two distinct parts: a base cement composition and a separate catalyst composition. The catalyst composition containing chlorides and metal oxides is prepared separately and added to the base cement just before use. This segmentation allows the cement to remain stable during storage while achieving high reactivity when needed, resolving the contradiction between stability and reactivity.
Solution Approach 2:
The catalyst composition is prepared in advance as a separate entity with specific ratios of chlorides and metal oxides. This preliminary preparation ensures that the reactive components are ready to enhance the reactivity of the base cement when combined, without compromising the stability of the stored cement composition.
2Ease of operation
If the catalyst composition is prepared in advance and stored, then convenience is improved, but reactivity is lost due to deactivation
Solution Approach 1:
The system is divided into a stable base cement composition and a separately stored catalyst composition. The catalyst composition maintains its reactivity when stored separately, and only becomes active when mixed with the base cement immediately before application. This resolves the contradiction by allowing advance preparation while preventing deactivation through separate storage.
Solution Approach 2:
The catalyst composition acts as an intermediary that bridges the stability of stored cement and the reactivity needed for application. By preparing the catalyst separately with optimal proportions of chlorides and metal oxides, it serves as a stable intermediate that can be stored conveniently while maintaining its ability to enhance reactivity when combined with the base cement.
3Reliability
If higher reactivity is achieved through catalyst addition, then performance in demanding applications is improved, but the composition becomes more complex
Solution Approach 1:
The complex catalyst system is segmented into a pre-formulated catalyst composition with specific ratios of chlorides and metal oxides. This segmented approach allows the complex chemistry to be contained in a separate, pre-prepared component rather than requiring complex mixing of multiple ingredients at the time of use, thus improving performance while managing composition complexity.
Solution Approach 2:
The catalyst composition itself is a composite material combining chlorides and metal oxides in specific proportions. This composite structure provides the necessary reactivity enhancement for demanding applications like oil well cementing and soil stabilization, while the composite nature allows for stable storage and convenient handling despite the chemical complexity.
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 catalyst composition significantly increases the reactivity and stability of cement, enhancing its performance in demanding applications by forming durable crystalline structures and regulating pH, which results in improved strength, durability, and environmental safety.
Implementation Method 1
A catalyst composition comprising chlorides like ammonium chloride and metal oxides, particularly magnesium oxide, is introduced to enhance the reactivity of cement components
Implementation Method 2
regulating pH, which results in improved strength, durability, and environmental safety
Data Source
AI summary
A catalyst composition for pozzolan compositions, includes: a) one or more chlorides, selected from the group consisting of: sodium chloride, potassium chloride, magnesium chloride, calcium chloride, strontium chloride, barium chloride and/or ammonium chloride, preferably ammonium chloride; b) aluminum chloride, and c) one or more metal oxides, preferably selected from the group consisting of: oxides from metals from Group II of the Periodic Table, oxides from metals from Group VIII B of the Periodic Table (e.g. iron oxide), more preferably oxides from metals from Group II of the Periodic Table, even more preferably magnesium oxide or calcium oxide, most preferably magnesium oxide. The use of the catalytic composition for addition to cement for oil well cementing, and for lowering the pH of cement, a method for obtaining a composition for reinforcing cement, a binder composition and a construction composition are also described.