Slag-Based Hydraulic Binder Activation for Rapid Hardening
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Solution Overview
Problem
Current hydraulic binders, particularly Portland cement, face challenges such as high energy intensity, significant CO2 emissions, health hazards, and instability in wet conditions, necessitating the development of alternative binders like ground granulated blast furnace slag that require activation to achieve rapid setting and hardening while being environmentally and health-friendly.
Innovation Solution
A hydraulic binder composition comprising at least 50% ground granulated blast furnace slag, activated by a system including calcium sulfate, Portland clinker, an aluminum derivative, and an alkali or alkaline earth metal salt, which enhances setting and hardening speed, mechanical properties, and durability, while reducing environmental and health impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Portland cement is used as a hydraulic binder, then mechanical strength and setting speed are achieved, but CO2 emissions and energy consumption increase significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using ground granulated blast furnace slag (at least 50% by weight) as the primary binder material instead of traditional Portland cement. This substitution fundamentally alters the chemical reactions involved, reducing CO2 emissions while maintaining mechanical strength through the activation of latent hydraulic properties in the slag.
Solution Approach 2:
The patent utilizes industrial waste material (blast furnace slag) that would otherwise be disposed of, transforming it into a valuable binder resource. This approach eliminates the need for energy-intensive cement production while providing effective binding properties, addressing both environmental and economic concerns.
2Object-generated harmful factors
If ground granulated blast furnace slag is used as binder, then environmental impact is reduced, but setting and hardening speed are insufficient without activation
Solution Approach 1:
The patent introduces an activation system comprising calcium sulfate, aluminum derivatives, and alkali/alkaline earth metal salts as intermediary substances. These activators mediate between the ground granulated blast furnace slag and water, triggering and accelerating the hydraulic reactions to achieve practical setting and hardening speeds while maintaining the environmental benefits of slag-based binding.
Solution Approach 2:
The patent modifies the chemical reactivity parameters of the ground granulated blast furnace slag through the addition of specific activators. By controlling the composition and dosage of calcium sulfate, aluminum derivatives, and alkali salts, the reaction kinetics are optimized to achieve rapid setting and hardening while preserving the low-carbon advantage of slag-based binders.
3Object-affected harmful factors
If calcium sulfate is used to activate blast furnace slag, then health safety is improved, but stability in wet conditions deteriorates
Solution Approach 1:
The patent creates a composite activation system combining calcium sulfate with aluminum derivatives and alkali/alkaline earth metal salts. This composite approach leverages the health safety advantages of calcium sulfate while the aluminum and alkali components compensate for the wet stability deficiencies, achieving a balanced performance profile.
Solution Approach 2:
The patent applies different functional components to address different performance requirements: calcium sulfate provides health safety and initial activation, while aluminum derivatives and alkali salts specifically enhance wet condition stability. Each component is optimized for its specific function within the overall activation system.
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 binder achieves improved setting and hardening speed, maintaining mechanical properties over time, even in wet conditions, with reduced environmental and health risks, making it suitable for rapid service applications and durable construction materials.
Implementation Method 1
at least one aluminum derivative chosen from an alumina having a BET specific surface ranging from 100 to 400 m2/g
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a hydraulic binder composition comprising at least 50% by weight of ground granulated blast furnace slag and a slag activation system, said system comprising at least calcium sulfate, at least one product selected from a Portland clinker source and lime, at least one aluminum derivative, and at least one alkali or alkaline earth metal salt. The present invention also relates to a ready-to-mix construction material composition comprising such a hydraulic binder and inert aggregates capable of being agglomerated in the presence of an aqueous phase. The present invention further relates to a method for preparing the ready-to-mix composition according to the invention, comprising a step of mixing said composition with water for the purpose of preparing a construction material, such as concrete or mortar, and in particular adhesive mortar, jointing mortar, or smoothing mortar or plaster.