Balanced Air Void-Forming Agent for Cementitious Systems
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Solution Overview
Problem
Cementitious systems, such as concrete and mortar, face challenges in maintaining a consistent air void content and stability due to the sensitivity of existing air void-forming materials to various factors like mixing duration, type, and additives, leading to insufficient expansion space for ice crystals and potential spalling from de-icing salts.
Innovation Solution
An air void-forming agent combining materials with foaming and defoaming effects, balanced to maintain a neutral air content within 40 minutes, reducing dependency on mixing conditions and additives, using substances like tall oil, surfactants, and fatty acids to create stable air voids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single air void-forming material is used, then the air void content can be introduced, but the air void structure is modified over time due to foaming or defoaming effects
Solution Approach 1:
The patent applies parameter changes by combining air void-forming materials with different foaming/defoaming characteristics to create a balanced system. The composition parameters (types and amounts of surfactants, oils, and other agents) are specifically adjusted so that the foaming effect of one material compensates for the defoaming effect of another, maintaining stable air void content over time.
Solution Approach 2:
The patent uses composite materials by combining multiple air void-forming substances with opposing effects (foaming and defoaming) into a single balanced composition. This composite approach allows the materials to counterbalance each other's instability effects, resulting in a durable air void structure that resists modification over time.
2Quantity of substance
If conventional air void-forming materials are used, then air voids are formed, but the air content varies depending on mixing duration and mixing type
Solution Approach 1:
The patent achieves universality by formulating an air void-forming composition that performs consistently across different mixing conditions (duration, type, intensity). The balanced combination of foaming and defoaming materials creates a system that is not sensitive to variations in mixing parameters, making it universally applicable to different concrete mixing scenarios.
3Quantity of substance
If conventional air void-forming materials are used, then air voids are introduced, but there is poor compatibility with plasticizers and other concrete additives
Solution Approach 1:
The patent addresses compatibility issues by adjusting the chemical composition parameters of the air void-forming agent. The specific selection and proportioning of surfactants, oils, and other components are optimized to ensure compatibility with common concrete additives like plasticizers, superplasticizers, and admixtures, preventing adverse interactions while maintaining air void formation.
4Quantity of substance
If conventional air void-forming materials are used, then air voids are formed, but the air void content changes over the first minutes after mixing
Solution Approach 1:
The patent applies preliminary anti-action by incorporating defoaming materials in advance to counterbalance the foaming effect that would otherwise cause air void content to increase over time. This pre-balanced composition prevents the undesirable modification of air void structure during the critical initial minutes after mixing, ensuring immediate and lasting stability.
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 provides a robust and stable air void structure in cementitious systems, minimizing changes in air content and size, enhancing resistance to de-icing salts and improving processability, regardless of cement type, aggregate composition, or mixing conditions.
Implementation Method 1
at least one air void-forming material with foaming effect
Implementation Method 2
at least one air void-forming material with defoaming effect
Implementation Method 3
stabilized by the addition of the air void-forming agent
Data Source
AI summary
An air void-forming agent, more particularly for cementitious systems, contains at least one air void-forming material with foaming effect, at least one air void-forming material with defoaming effect, and water.