Powdered Quick-Setting Agent for Water Contact Adhesion
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Solution Overview
Problem
Current quick-setting agents, such as those containing water glass, alkali metal aluminate, alkali metal carbonate, and combinations with calcined alunite, exhibit poor quick-setting performance, particularly in water contact environments like spring-fed areas, where adhesion and repair are challenging due to poor flowability and strength expression.
Innovation Solution
A powdered quick-setting agent comprising calcium aluminate and sodium silicate, with specific molar ratios and additives like alkali carbonate, calcium hydroxide, and sulfates, which enhances adhesion and self-repairing capabilities in water contact environments by forming a gel that fills and hardens cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional quick-setting agents (water glass, alkali metal aluminate, alkali metal carbonate) are used, then setting speed is improved, but adhesion performance in water contact environment deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the quick-setting agent by using calcium aluminate with specific CaO/Al2O3 ratios (2.0-3.0) and controlling the molar ratio of SiO2/Na2O in sodium silicate (0.5-1.5). This parameter optimization enables the material to achieve both rapid setting and good adhesion in water contact environments, resolving the contradiction between setting speed and adhesion performance.
Solution Approach 2:
The patent creates a composite quick-setting agent system combining calcium aluminate, sodium silicate, and optional additives (alum, alkali carbonate, calcium hydroxide, sulfates). This composite material approach synergistically improves both setting speed and adhesion performance in water contact environments, overcoming the limitations of single-component agents.
2Stability of the object's composition
If quick-setting material is pulverized and combined with cement for spring-fed area treatment, then flowability is reduced to extremely high extent, but setting performance and strength expression are also required
Solution Approach 1:
The patent optimizes the particle size distribution and chemical composition parameters of the quick-setting agent to control flowability while maintaining setting performance. By adjusting the CaO/Al2O3 ratio in calcium aluminate and SiO2/Na2O ratio in sodium silicate, the material achieves extreme flowability control necessary for spring-fed areas while ensuring adequate setting and strength development.
Solution Approach 2:
The patent applies different components of the quick-setting agent to different functional requirements: calcium aluminate provides rapid strength development, sodium silicate controls flowability and contributes to adhesion, and optional additives fine-tune specific properties. This local quality differentiation allows simultaneous achievement of extreme flowability control and excellent setting performance.
3Reliability
If conventional quick-setting agents are used in spring-fed areas, then adhesion performance is poor, but self-repairing capability is needed for cracked sites
Solution Approach 1:
The patent incorporates sodium silicate and optional additives that enable the quick-setting material to automatically repair cracks through self-repairing mechanisms. The material reacts with water to form gel structures that fill and seal cracks, providing self-service repair functionality without external intervention, thus achieving both good adhesion and self-repairing capability.
Solution Approach 2:
The composite formulation combining calcium aluminate, sodium silicate, and optional additives creates a material system that simultaneously provides good adhesion performance and self-repairing capability. The synergistic interaction between components enables the material to adhere well to substrates in water contact environments while also possessing the ability to self-repair cracks.
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 agent demonstrates improved adhesion and self-repairing performance in water contact environments, achieving rapid flowability reduction and strong initial and long-term strength, effectively repairing cracks in a water contact environment for extended periods.
Implementation Method 1
by using a specific quick-setting agent, adhesiveness of spray concrete in a water contact environment is improved and, in addition, even when spray concrete is cracked, it still has a self-repairing performance
Implementation Method 2
A powdered quick-setting agent containing a calcium aluminate and a sodium silicate
Data Source
AI summary
A powdered quick-setting agent containing a calcium aluminate and a sodium silicate, preferably further containing at least one selected from the group consisting of an alkali metal sulfate, an alkaline earth metal sulfate, and an aluminum sulfate.