Granulated Blast-Furnace Slag Activator for Early Strength
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Solution Overview
Problem
Current supersulfated cement has limitations such as longer setting times, low early strength, and susceptibility to efflorescence, which restricts its widespread use in China, particularly in construction where high flexural strength and durability are required.
Innovation Solution
A granulated blast-furnace slag activator comprising 62% to 95% gypsum and 5% to 38% high belite sulfoaluminate cement clinker, which is ground with optional mineral activation and setting-accelerating components to enhance reactivity and strength, is used to activate granulated blast-furnace slag, improving early and long-term strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sulfate activation is used alone to activate granulated blast-furnace slag, then the activation process is simple, but the slag cannot be well activated and cementation strength is low
Solution Approach 1:
The patent combines sulfate activation and alkaline activation into a dual-activation system. The activator contains both sulfate sources (gypsum, anhydrite) and alkaline components (sodium hydroxide, sodium carbonate, water glass), enabling synergistic activation that overcomes the limitations of using either method alone.
Solution Approach 2:
The activator is formulated as a composite material containing multiple components: sulfate sources (gypsum 30-70%, anhydrite 10-40%), alkaline activators (sodium hydroxide 5-20%, sodium carbonate 5-20%, water glass 5-20%), and auxiliary components (lime 0-10%, magnesium oxide 0-10%). This composite structure enables simultaneous sulfate and alkaline activation mechanisms.
2Ease of manufacture
If supersulfated cement is produced using industrial waste residue, then production cost is low, but setting time is long and early strength is low
Solution Approach 1:
The patent modifies the chemical composition parameters of the activator to optimize reaction kinetics. By adjusting the ratios of sulfate sources, alkaline activators, and auxiliary components, the system achieves faster hydration reactions and shorter setting times while maintaining the use of industrial waste residue (granulated blast-furnace slag) for cost-effectiveness.
Solution Approach 2:
The dual-activation system acts as an intermediary mechanism that accelerates the hydration process. The combined sulfate and alkaline activation creates a more reactive environment that speeds up the formation of cementitious phases, reducing setting time without requiring expensive raw materials.
3Ease of manufacture
If supersulfated cement is produced using industrial waste residue, then production cost is low, but early strength and long-term strength are insufficient
Solution Approach 1:
The patent merges sulfate activation and alkaline activation mechanisms to create a dual-activation system that enhances both early and long-term strength development. This combined approach enables effective activation of granulated blast-furnace slag while maintaining cost-effectiveness through the use of industrial waste residue.
Solution Approach 2:
The activator is designed as a composite material with multiple components working synergistically: sulfate sources for sulfate activation, alkaline activators for alkaline activation, and auxiliary components that contribute to strength development. This composite structure enables simultaneous achievement of cost-effectiveness and high strength performance.
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 significantly accelerates hydration and hardening, increases early and long-term strength, particularly flexural strength, and enhances durability by forming a dense ettringite matrix, addressing the limitations of existing supersulfated cement.
Implementation Method 1
accelerates the progress of hydration of the slag
Implementation Method 2
SO42− is chemically combined with active Al2O3 and hydrated calcium aluminate in granulated blast-furnace slag to produce hydrated calcium sulfoaluminate
Implementation Method 3
grinding gypsum together with high belite sulfoaluminate cement clinker, optionally a mineral activation component and optionally a setting-accelerating and strength-enhancing component
Data Source
AI summary
Provided are a granulated blast-furnace slag activator and a method of manufacturing the same. The granulated blast-furnace slag activator includes, in percent by weight, the following raw materials: 62% to 95% of gypsum and 5% to 38% of high belite sulfoaluminate cement clinker. Also provided is a method of manufacturing cement by mixing the granulated blast-furnace slag activator with granulated blast-furnace slag at a certain ratio.