Polyol Ester Pulverization Aid for Early Concrete Strength
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Solution Overview
Problem
The challenge is to enhance the early strength of hydraulic compositions, such as concrete, to improve properties like formwork removal speed and frost resistance, while also reducing long-term strength loss due to drying, and to develop sustainable cement production methods by utilizing waste materials and reducing greenhouse gas emissions.
Innovation Solution
A method involving the addition of a strength improver composition during the pulverization of hydraulic compounds, which includes a reaction product of glycerin and formaldehyde, along with other compounds like ethylene oxide adducts and urea-formaldehyde condensates, to enhance the hydration reaction and reduce water evaporation, thereby improving the 3-day compressive strength and long-term durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the formwork is removed early to improve construction efficiency, then the construction speed increases, but the concrete strength is insufficient and long-term strength is significantly reduced due to drying
Solution Approach 1:
The patent applies preliminary action by adding a pulverization aid composition containing polyol esters of dicarboxylic acid before the hydration reaction occurs. This pre-treatment modifies the cement particles to promote faster and more complete hydration, enabling early formwork removal while maintaining strength development. The polyol ester additives are incorporated into the cement mixture in advance, creating a modified cement system that accelerates early strength gain without compromising long-term strength.
Solution Approach 2:
The patent changes the chemical parameters of the cement system by introducing specific polyol ester compounds (esters of dicarboxylic acid with polyols having 3-8 carbon atoms). These chemical parameter changes alter the hydration kinetics, promoting faster formation of strength-giving hydration products. The addition of 0.1-10 parts by mass of the pulverization aid per 100 parts by mass of cement fundamentally changes the hydration rate and strength development profile, allowing early formwork removal at 1-7 days while maintaining 70% or more of ultimate strength.
2Object-generated harmful factors
If waste materials and by-products are used as admixtures to reduce clinker content and greenhouse gas emissions, then environmental sustainability improves, but the early strength becomes unstable due to variation in mineral composition
Solution Approach 1:
The patent uses polyol esters of dicarboxylic acid as an intermediary substance that mediates between the variable mineral composition of waste-based cement and the requirement for stable early strength. The pulverization aid acts as a chemical mediator that standardizes the hydration behavior regardless of the specific mix of waste materials (blast furnace slag, fly ash, incinerated ash) present in the cement. This intermediary additive ensures consistent early strength development even when the underlying cement composition varies due to different waste material sources and proportions.
3Strength
If non-treated glycerin is added as a cement additive to improve compressive strength, then the 3-day strength increases, but the mechanism is unclear and the effect may be inconsistent
Solution Approach 1:
The patent improves upon the glycerin approach by precisely defining the chemical parameters of the additive. Instead of using non-treated glycerin with variable composition, the invention specifies polyol esters of dicarboxylic acid with exact structural parameters: polyols having 3-8 carbon atoms and specific esterification ratios. This parameter specification ensures consistent chemical composition and predictable hydration effects. The well-defined chemical structure of the pulverization aid provides reliable and repeatable early strength improvement, eliminating the inconsistency associated with non-treated glycerin.
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 proposed method significantly increases the 3-day compressive strength of hydraulic compositions and reduces long-term strength loss, while allowing for the use of waste materials in cement production, thereby improving construction efficiency and environmental sustainability.
Implementation Method 1
accelerate the hydration reaction of cement and convert cement into a hydrate of cement
Implementation Method 2
suppress the evaporation, it is effective to accelerate the hydration reaction of cement and convert cement into a hydrate of cement from which water is not easily dried (evaporated)
Data Source
AI summary
The present invention relates to: a strength improver composition for a hydraulic powder, which contains a reaction product obtained by the reaction of (a1) at least one compound selected from polyhydric alcohols having a valency of 2 or more and 5 or less and (a2) an aldehyde compound or ketone compound; and a method for improving the strength of a cured product of a hydraulic composition, which includes adding the strength improver composition to a hydraulic composition.