Quarry Fines Apportioning for Clinker Reduction
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Solution Overview
Problem
The cement and concrete industry faces challenges in effectively utilizing quarry fines and limestone powder due to their unpredictable effects on water demand and rheology, leading to increased costs and environmental concerns, as they do not fit into existing categories of materials used in concrete production, resulting in suboptimal substitution for cement clinker.
Innovation Solution
A method of apportioning quarry fines and limestone powder between cementitious binder and aggregate fractions within concrete compositions, defining a portion as contributing to the water-to-cementitious binder ratio and another as not, to predictably manage water demand and rheology, thereby reducing clinker content and cost while maintaining strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If quarry fines and limestone powder are used to substitute cement clinker, then clinker content and cost are reduced, but water demand and rheology become unpredictable
Solution Approach 1:
The patent applies parameter changes by systematically varying the particle size distribution of quarry fines and limestone powder, specifically controlling the d90 value (90th percentile particle size) to optimize performance. By adjusting this critical parameter, the invention achieves predictable water demand and rheology while maintaining high clinker substitution levels. The method transforms an unpredictable material into a controllable component through precise particle size specification.
2Quantity of substance
If quarry fines and limestone powder are used to substitute cement clinker, then clinker content and cost are reduced, but strength and durability may be compromised
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the cementitious composition based on particle size. Coarser quarry fines (larger d90) serve as aggregate substitutes providing structural framework, while finer particles fill voids and contribute to paste matrix strength. This spatial differentiation of particle functions allows high clinker substitution while maintaining both strength and durability through optimized local material distribution.
3Ease of manufacture
If quarry fines and limestone powder are used in conventional categories, then material classification is simplified, but performance optimization is limited
Solution Approach 1:
The patent applies universality by creating a multi-functional material classification system where quarry fines and limestone powder can simultaneously serve as cement substitutes, aggregate substitutes, and rheology modifiers depending on their particle size distribution. The d90-based classification enables a single material to fulfill multiple functions in the concrete composition, eliminating the need for separate additive categories while optimizing performance through controlled particle size.
Data Source
AI summary
Quarry fines and/or limestone powder are used to reduce clinker content in concrete, mortar and other cementitious compositions, typically in combination with one or more pozzolanically active SCMs. Quarry fines and/or limestone powder can replace and/or augment a portion of hydraulic cement binder and/or fine aggregate. Quarry fines and/or limestone powder can advantageously replace a portion of cement binder and fine aggregate, acting as an intermediate that fills a particle size void between the largest cement particles and smallest fine aggregate particles. Supplemental lime can advantageously maintain or enhance balance of calcium ions in the mix water and/or pore solution. Supplemental sulfate can advantageously address sulfate deficiencies caused by high clinker reduction, use of water reducers and/or superplasticers, and SCMs containing aluminates. Such systematic approach to beneficially using quarry fines, limestone powder, SCMs, lime, and sulfate addresses many issues and permits high clinker reduction with similar or increased strength.