Copolymer Admixture for Concrete Fluidity and Consistency
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Solution Overview
Problem
Existing concrete admixtures struggle to maintain optimal flowability and consistency across different cement types, particularly with blended hydraulic cements, and often experience fluidity loss over time, making it difficult to control concrete quality in varying conditions.
Innovation Solution
A copolymer comprising structural units derived from ethylenically unsaturated monomers with C2-C3 oxyalkylene groups, alkyl or hydroxyalkyl esters of ethylenically unsaturated mono- or di-carboxylic acids, and ethylenically unsaturated monocarboxylic acids or their salts, which is added to cement mixtures to enhance dispersibility and maintain fluidity and workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional admixtures are used to improve flowability, then fluidity is enhanced initially, but fluidity is lost over time
Solution Approach 1:
The patent modifies the chemical structure of the admixture by incorporating specific monomer units (carboxylic acid, carboxylic acid ester, and carboxylic acid anhydride) in defined proportions to change the chemical parameters of the admixture, enabling it to maintain fluidity over extended periods without loss
Solution Approach 2:
The admixture is formulated as a composite copolymer combining multiple monomer components (carboxylic acid units, carboxylic acid ester units, and carboxylic acid anhydride units) in specific ratios to achieve both immediate fluidity enhancement and long-term consistency
2Reliability
If admixtures are optimized for specific cement types, then performance is improved for that cement, but adaptability to different cement types deteriorates
Solution Approach 1:
The copolymer admixture is designed with a universal chemical structure that enables it to function effectively across multiple cement types (Portland cement, blended hydraulic cement, white cement) without requiring formulation changes, achieving both performance consistency and adaptability
3Ease of operation
If water-cement ratio is increased to improve workability, then fluidity is enhanced, but quality control becomes more difficult
Solution Approach 1:
The copolymer admixture acts as an intermediary substance that mediates between the water-cement ratio and workability requirements, enabling adequate fluidity and workability to be achieved with lower water-cement ratios while maintaining quality control through the chemical action of the admixture
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 copolymer maintains concrete fluidity and workability for an extended period, exhibits earlier working time, and is effective across various cement types, including blended hydraulic cements, allowing for better control of quality parameters regardless of temperature and water-cement ratio.
Implementation Method 1
the copolymer... enhance dispersibility and maintain fluidity and workability
Data Source
AI summary
The invention relates to a copolymer, said copolymer consisting of, as structural units, (i) 0.1 to 50 mole % of units derived from an ethylenically unsaturated monomer (a) having per one mole thereof 25 to 300 moles of C2-C3 oxyalkylene groups; (ii) 0.1 to 49.9 mole % of units derived from a monomer (b) of an alkyl, alkenyl or hydroxyalkyl ester of an ethylenically unsaturated mono- or di-carboxylic acid; (iii) 0.1 to 90 mole % units derived from a monomer (c) selected from the group consisting of an ethylenically unsaturated monocarboxylic acid, a salt thereof, an ethylenically unsaturated dicarboxylic acid, an anhydride thereof and a salt thereof; (iv) optionally up to 30 mole % of other monomers. Said copolymer can be used as a concrete and/or mortar admixture that allows optimal flow ability and, at the same time, can maintain a specific consistency, fluidity and workability of the concrete independently of the cement type.