Polymeric Dispersant Additive for Concrete Slump Retention
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Solution Overview
Problem
Existing slump retainers for hydraulically setting compositions, such as concrete, either fail to provide sufficient slump retention without compromising early strength or require complex and costly synthesis processes, making them impractical for on-site adjustments.
Innovation Solution
An additive comprising an aqueous colloidally disperse preparation of a salt of polyvalent metal cations with organic phosphonate or phosphate compounds, combined with a polymeric dispersant having anionic and polyether side chains, allowing for adjustable slump retention and early strength maintenance without the need for extensive synthesis or on-site conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If slump retainers are used to maintain processing properties for extended periods, then slump retention is improved, but early strength is compromised
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight, charge density, and polyethylene glycol side chain characteristics of the polymeric dispersant. These parameter adjustments allow the additive to maintain slump retention for up to 90 minutes while minimizing negative impact on early strength, resolving the contradiction between extended processing time and strength development
Solution Approach 2:
The invention uses composite material approach by combining polymeric dispersants with specific molecular structures (comb polymers with polyethylene glycol side chains) to create an additive that simultaneously provides slump retention and preserves early strength. The composite structure of the polymer with its specific functional groups enables dual functionality that resolves the contradiction
2Quantity of substance
If water reducers are used to reduce excess water fraction, then processing consistency is improved, but processing properties deteriorate after 10 to 30 minutes
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of polymer structure from conventional water reducers to comb polymers with polyethylene glycol side chains. This structural parameter change enables the additive to reduce excess water while maintaining processing properties for up to 90 minutes, unlike conventional water reducers that lose effectiveness after 10-30 minutes
3Adaptability or versatility
If conversion between water reducer and slump retainer is needed, then functional flexibility is improved, but conversion requires synthetic or polymerization measures in laboratory or chemical production plant
Solution Approach 1:
The patent applies universality by designing a polymeric dispersant with adjustable parameters that can function as either water reducer or slump retainer depending on the specific parameter selection. The comb polymer structure with polyethylene glycol side chains provides multi-functionality, eliminating the need for complex conversion processes and allowing direct use in chemical production plant
Solution Approach 2:
The invention resolves the complexity issue by using parameter changes in the polymer structure (molecular weight, charge density, side chain length) to achieve different functions. This approach allows functional flexibility without requiring conversion processes, as the desired function is achieved through initial parameter selection in the production 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 additive effectively maintains slump retention for extended periods while preserving early strength, offering a flexible and cost-effective solution for on-site concrete processing without the limitations of prior technologies.
Implementation Method 1
additives which comprise polymeric dispersants. Additives of this kind are able to prevent the formation of agglomerates of solids, to disperse existing particles
Implementation Method 2
These polymers have a carboxyl-containing main chain with polyethylene glycol-containing side chains
Implementation Method 3
An additive comprising an aqueous colloidally disperse preparation of a salt of polyvalent metal cations with organic phosphonate or phosphate compounds
Implementation Method 4
the polymeric dispersant comprising anionic and polyether side chains
Data Source
AI summary
The present invention relates to an additive for hydraulically setting compositions comprising a colloidally disperse preparation comprising at least one salt of a polyvalent metal cation with at least one organic phosphonate and/or phosphate compound as anion and at least one polymeric dispersant comprising anionic and/or anionogenic groups and polyether side chains. The additive is especially suitable as slump retainer and for improving early strength.