Blast Furnace Slag Binder Composition for Fluidity Retention
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Solution Overview
Problem
Existing hydraulic binder compositions with reduced clinker content, such as those using blast furnace slag, experience a rapid loss of fluidity, transitioning from a fluid to a solid state within 30 minutes, necessitating a solution to enhance fluidity retention.
Innovation Solution
Incorporation of a hydraulic binder composition comprising alumino-silicate compounds, alkaline or sulphate activators, guanidine and/or zinc salts, and specific polymers with defined formulae to enhance fluidity retention over time, maintaining threshold stresses below 10 Pa for at least 45 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If clinker content is reduced in cementitious compositions, then carbon emissions are decreased, but workability is rapidly lost and fluidity drops within minutes
Solution Approach 1:
The invention changes the chemical composition parameters of the hydraulic binder by incorporating specific amounts of calcium sulphate (5-20% by weight) and alkaline activators (sodium silicate, sodium hydroxide, or potassium hydroxide) to modify the setting behavior and fluidity retention of the blast furnace slag-based composition, allowing reduced clinker content while maintaining workability
Solution Approach 2:
The invention creates a composite hydraulic binder system combining blast furnace slag (50-95% by weight), calcium sulphate, alkaline activators, and optional clinker (0-10% by weight) to achieve both low carbon emissions and improved workability retention through synergistic interactions between components
2Quantity of substance
If blast furnace slag is used as the hydraulic binder, then clinker content is reduced, but the composition transitions from fluid to almost solid state in less than 30 minutes
Solution Approach 1:
The invention modifies the rheological parameters of the composition by controlling the dosage of alkaline activators (0.5-5% by weight) and calcium sulphate (5-20% by weight) to extend the fluid state duration from minutes to hours, enabling practical construction applications of low-clinker or clinker-free compositions
Solution Approach 2:
The invention introduces calcium sulphate as an intermediary substance that mediates between the alkaline activator and blast furnace slag, controlling the activation rate and setting behavior to maintain fluidity for extended periods while still achieving hydraulic bonding
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 solution effectively prolongs fluidity retention of hydraulic compositions to over 45 minutes, maintaining low threshold stresses, thereby improving workability and reducing the need for rapid setting.
Implementation Method 1
a polymer (P) comprising units having the following formulae (I) and (II)... which makes it possible to obtain a hydraulic composition that exhibits enhanced retention of fluidity
Data Source
AI summary
A hydraulic binder composition comprising: a hydraulic binder including at least one alumino-silicate compound, for example blast furnace slag, and an alkaline or sulfate activator and a maximum of 10 wt % of clinker, preferably between 0 and 10 wt % of clinker; a guanidine salt and/or a zinc salt; and a polymer.