Defoaming Agent and Air-Entraining Compound System for Cement
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Solution Overview
Problem
Current defoaming agents for hydraulic binders are ineffective in minimizing air introduction during cement production, leading to reduced compressive strength in cured products, and are difficult to distribute homogeneously, especially when used in small quantities.
Innovation Solution
A method involving contacting cement clinker with a defoaming agent and an air-introducing compound before, during, or after grinding, using specific chemical formulations to minimize air introduction and enhance processing properties, resulting in improved compressive strength and early strength development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional defoaming agents are used in small quantities, then cost is reduced, but homogeneous distribution is difficult and air introduction is not effectively minimized
Solution Approach 1:
The patent uses polycarboxylate ether as an intermediary substance that facilitates the distribution and effectiveness of the defoaming agent. This intermediary compound enables better dispersion of the defoaming agent throughout the cement mixture, achieving homogeneous distribution even at low concentrations of the defoaming agent itself.
Solution Approach 2:
The invention creates a composite additive system combining the defoaming agent with polycarboxylate ether. This composite material approach allows the defoaming agent to work synergistically with the polycarboxylate ether, improving both distribution characteristics and defoaming effectiveness while using minimal amounts of the defoaming agent.
2Ease of operation
If air-introducing compounds are used to improve processing properties, then workability is enhanced, but compressive strength of cured products is reduced
Solution Approach 1:
The patent carefully controls the parameters of air introduction by using specific polycarboxylate ether compounds that modify the air bubble characteristics. This changes the parameters of air introduction from large bubbles that severely reduce strength to smaller, more uniformly distributed bubbles that have minimal impact on compressive strength while still improving processing properties.
Solution Approach 2:
The invention converts the harmful effect of air introduction into a beneficial one by using polycarboxylate ether to control air bubble formation. The air that would normally be harmful is transformed into controlled, small bubbles that improve processing properties without significantly compromising strength, effectively converting a harmful factor into a beneficial one.
3Productivity
If grinding assistants are used to reduce grinding time and energy, then productivity is improved, but air introduction increases
Solution Approach 1:
The patent uses polycarboxylate ether as an intermediary that mediates between the grinding process and air introduction. This intermediary substance allows the grinding assistants to perform their function of improving grinding efficiency while the polycarboxylate ether simultaneously controls and minimizes the air introduction that would otherwise occur during the grinding process.
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 method achieves low air introduction during cement production, leading to enhanced compressive strength after 28 days and improved early strength, while maintaining good processing properties.
Implementation Method 1
contacting a composition comprising cement clinker with (a) a defoaming agent
Implementation Method 2
contacting a composition comprising cement clinker with (b) 0.0005% to 2% by weight, based on the total composition, of at least one air-introducing compound
Implementation Method 3
A key step in cement production is therefore the grinding of the cement clinker
Implementation Method 4
grinding assistants act by enveloping the particles - which have a tendency towards agglomeration - with thin layers, more particularly monomolecular layers
Implementation Method 5
Made up with water, cement produces cement slurry, which solidifies by hydration and hardens
Data Source
AI summary
The invention relates to a method for producing a hydraulic binder, comprising contacting a composition comprising cement clinker, before, during or after the grinding procedure, with (a) a defoaming agent and (b) 0.0005% to 2% by weight, based on the total composition, of at least one air-introducing compound, the defoaming agent (a) comprising 0.0001 % to 0.5% by weight, based on the total composition, of at least one defoaming agent of the formula R10 - (CmH2m-O-)x -(CdH2d-O-)c -H and the ratio of (a) to (b) being between 1:1 to 1:200.