Shrinkage-Reducing Agent Composition for Hydraulic Materials
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Solution Overview
Problem
Current shrinkage-reducing agents for hydraulic materials often compromise concrete strength, require additional admixtures, and increase costs, while also failing to effectively prevent cracking and improve durability.
Innovation Solution
A shrinkage-reducing agent composition comprising a compound represented by the general formula R1—[O-(A1O)m—R2]n, where R1 is derived from a polyhydric alcohol, A1O is an oxyalkylene group, and R2 is a hydrogen or hydrocarbon group, combined with a polyalkyleneimine and a polyoxyalkylene-based polymer, which does not require additional admixtures and enhances water-reducing and freezing-thawing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional shrinkage-reducing agents are used, then drying shrinkage is reduced, but concrete strength decreases
Solution Approach 1:
The patent changes the chemical parameters of the shrinkage-reducing agent by using polyalkyleneimine with specific molecular weight (1,000-100,000) and nitrogen content (10-30%), which allows achieving shrinkage reduction without the strength loss associated with conventional agents. This parameter optimization enables the agent to suppress shrinkage while maintaining concrete strength.
Solution Approach 2:
The patent creates a composite additive system combining polyalkyleneimine with water-reducing agents and superplasticizers. This composite approach allows the shrinkage-reducing function to be achieved through synergistic effects, where the polyalkyleneimine works together with other admixtures to suppress shrinkage while the water-reducing components maintain concrete strength.
2Reliability
If shrinkage-reducing agents are used to prevent cracking, then durability improves, but additional admixtures are required increasing cost
Solution Approach 1:
The patent develops polyalkyleneimine that serves multiple functions: it acts as a shrinkage-reducing agent, a water-reducing agent, and a potential superplasticizer. This multi-functionality eliminates the need for separate admixtures for each function, reducing the number of components while improving durability through comprehensive shrinkage control.
Solution Approach 2:
The patent merges the functions of shrinkage reduction, water reduction, and strength maintenance into a single polyalkyleneimine-based additive system. By combining these functions in one agent rather than using separate admixtures, the patent simplifies the formulation while achieving enhanced durability through integrated shrinkage control.
3Strength
If alkylene oxide adducts of polyhydric alcohols are used, then strength reduction is suppressed, but combination with other admixtures is required
Solution Approach 1:
The patent uses polyalkyleneimine as a universal additive that can function alone or in combination with water-reducing agents and superplasticizers. Its multi-functionality allows it to suppress shrinkage and maintain strength without requiring mandatory combinations with other specific admixtures, providing flexibility while maintaining strength.
Data Source
AI summary
Provided are a shrinkage-reducing agent for a hydraulic material and a shrinkage-reducing agent composition for a hydraulic material including a compound represented by the general formula (1): R1—[O-(A1O)m—R2]n (1), where: R1 represents R1 derived from a polyhydric alcohol represented by R1—[OH]n; A1O represents an oxyalkylene group having 2 to 18 carbon atoms; R2 represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms; m represents an average added mole number of oxyalkylene groups A1O's; n represents 3 or 4; and when n equals 3, m represents 30 to 150, and when n equals 4, m represents 5 to 150.