GGBS Binder Composition with Particle Size Segmentation
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Solution Overview
Problem
The cement industry has a significant environmental impact due to high CO2 emissions and health hazards associated with Portland cement handling, prompting the need for environmentally friendly and safer alternatives for concrete and mortar compositions.
Innovation Solution
A binder composition comprising between 1% and 30% lime source, 5% to 75% ground granulated blast furnace slag, 20% to 90% filler, 0.1% to 5% SO3, 0.1% to 1% water reducer polymer, and 0% to 2% activator, with specific particle size distributions for improved rheology and mechanical properties, replacing traditional Portland cement-based compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Portland cement is used as binder, then mechanical strength and setting properties are achieved, but CO2 emissions increase and health hazards occur
Solution Approach 1:
The patent changes the chemical composition parameters by replacing Portland cement with GGBS-based binder, adjusting calcium oxide content to 30-70%, silica to 20-50%, and aluminum oxide to 5-20%. This parameter change maintains mechanical strength while reducing CO2 emissions and eliminating health hazards associated with cement alkalinity
Solution Approach 2:
The patent creates a composite binder material combining GGBS with supplementary cementing materials and chemical activators. This composite approach achieves the necessary mechanical properties and setting characteristics while using environmentally friendly materials that eliminate the harmful effects of traditional Portland cement
2Object-generated harmful factors
If GGBS is used as binder, then environmental impact is reduced, but setting time and early strength may be insufficient
Solution Approach 1:
The patent introduces chemical activators as intermediary substances that catalyze the hydration reaction of GGBS. These activators accelerate the setting process and enhance early strength development, allowing GGBS-based binder to achieve cement-like setting times and strength characteristics while maintaining environmental benefits
Solution Approach 2:
The patent adjusts the chemical composition parameters by controlling the ratios of calcium oxide (30-70%), silica (20-50%), and aluminum oxide (5-20%) in the GGBS binder, and by optimizing the amount of chemical activators (1-10%). These parameter changes ensure proper setting time and early strength while maintaining low environmental impact
3Adaptability or versatility
If GGBS is ground into fine powder, then substitutability to cement is improved, but production cost increases
Solution Approach 1:
The patent segments the binder composition into multiple components: GGBS (50-80%), supplementary cementing materials (20-50%), and chemical activators (1-10%). This segmentation allows flexible formulation that optimizes both substitutability to cement and production cost by adjusting the proportions of each component based on local material availability and project requirements
Data Source
AI summary
A binder composition in dry weight percentage comprises a) between 1% and 30% of at least one lime source, b) between 5% and 75% of ground granulated blast furnace slag, (c) between 20% and 90% of at least one filler, (d) between 0.1% and 5% of SO3−, e) between 0.1% and 1% of at least one water reducer polymer, f) between 0% and 2%, relative to the total weight of components a, b and c, of at least one activator different from d, the weights of d, e, f relative to the total weight of components a, b, c, said ground granulated blast furnace slag and the filler each being a mixture of two differently sized particles, the different sizes based on d50 and range of between 1 μm and 5 μm and >5 μm for the slag and between 0.05 μm and <8 μm and ≥8 μm and <200 μm for the filler.