Cementitious Composition with Saccharide for Strength and Chloride Resistance
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Solution Overview
Problem
Conventional cement compositions lack significant improvements in strength and durability, particularly in resisting chloride ion penetration, leading to structural deficiencies and high maintenance costs due to the limited effectiveness of corrosion inhibitors.
Innovation Solution
A cementitious composition comprising fly ash, slag cement, metakaolin, pumice, and a saccharide, which reduces the volume of cement required while enhancing flexural and compressive strength, and reducing chloride ion permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cement compositions are used, then basic concrete structure is achieved, but strength and durability remain limited with high chloride ion penetration
Solution Approach 1:
The patent uses a composite cementitious composition combining fly ash (40-55 wt%), metakaolin (25-50 wt%), and saccharide (0.05-0.5 wt%) to create concrete with superior strength and chloride resistance. This composite approach leverages the complementary properties of each material: fly ash for durability, metakaolin for early strength, and saccharide for reduced permeability, resolving the contradiction between strength and reliability.
Solution Approach 2:
The patent changes the chemical and physical parameters of the cement composition by incorporating specific ratios of fly ash, metakaolin, and saccharide. This parameter optimization transforms the concrete properties, achieving both high strength and excellent chloride ion resistance simultaneously, rather than treating them as separate trade-offs.
2Reliability
If corrosion inhibitors are added to delay corrosion, then chloride ion penetration is reduced, but cost increases significantly
Solution Approach 1:
The patent replaces expensive corrosion inhibitors with a cost-effective combination of fly ash, metakaolin, and saccharide. This substitution uses readily available, low-cost materials to achieve the same or better chloride ion resistance, eliminating the need for expensive chemical additives while maintaining long-term durability.
Solution Approach 2:
The patent changes the approach to chloride resistance by modifying the fundamental cement composition rather than adding corrective additives. By optimizing the ratio of fly ash, metakaolin, and saccharide, the concrete inherently resists chloride penetration through reduced permeability, avoiding the need for expensive corrosion inhibitors.
3Strength
If more cement is used to improve strength, then flexural and compressive strength increase, but cost and material volume increase
Solution Approach 1:
The patent creates a composite cementitious system where fly ash, metakaolin, and saccharide work synergistically to provide high strength properties. This composite approach allows achieving superior flexural and compressive strength with optimized material ratios, reducing the total cement volume needed while maintaining or enhancing strength performance.
Solution Approach 2:
The patent optimizes the chemical composition parameters of the cementitious material, using specific ratios of fly ash (40-55 wt%), metakaolin (25-50 wt%), and saccharide (0.05-0.5 wt%). This parameter optimization achieves high strength with reduced material volume by leveraging the enhanced reactivity and efficiency of the composite composition.
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 composition achieves improved flexural and compressive strength, reduced chloride ion permeability, and cost savings by using less cement, resulting in more durable and cost-effective concrete solutions.
Implementation Method 1
a cementitious composition comprising between about 40 wt. % and about 55 wt. % of fly ash and/or slag cement; between about 0.05 wt. % and about 0.5 wt. % of a saccharide; and between about 25 wt. % and about 50 wt. % of metakaolin and/or pumice
Data Source
AI summary
The invention relates to cementitious compositions, concrete compositions, and methods of making and using the cementitious compositions in the preparation of concrete. In particular, the cementitious compositions comprise a saccharide. In an aspect of the invention, the concrete compositions have improved properties, which can include, but are not limited to, increased flexural and compressive strength, improved wear, reduced permeability, and reduced slumping.