Cementitious Composition with High Glass Aggregate for Solid Surfaces
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Solution Overview
Problem
Existing cementitious compositions fail to achieve the necessary mechanical, chemical, and thermal properties for solid surface sheet-form building materials while incorporating a high percentage of recycled glass, leading to degradation of properties such as compressive strength, porosity, and hydraulic permeability.
Innovation Solution
A cementitious composition with a high percentage of recycled glass, utilizing a combination of pozzolans and fine/coarse glass aggregates, where the pozzolan to cement ratio is elevated, and the cement content is minimized, along with the inclusion of non-reactive silica-based fillers to enhance mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high percentage of recycled glass is incorporated into cementitious composition, then recycled content is improved, but mechanical strength and chemical properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific pozzolans (fly ash, silica fume, metakaolin) in optimized ratios with the glass aggregate. This modifies the reactive chemistry of the system to achieve both high glass content (60-90%) and adequate mechanical strength through pozzolanic reactions that form binding gel structures.
Solution Approach 2:
The patent creates a composite material system combining glass aggregate with pozzolanic materials and cementitious binders. This composite approach allows the glass to serve as both filler and reactive component, while the pozzolans provide binding mechanisms that maintain structural integrity despite high glass content.
2Strength
If high cement content is used to achieve mechanical strength, then compressive strength is improved, but the ability to incorporate high recycled glass content deteriorates
Solution Approach 1:
The patent optimizes the cement-to-pozzolan ratio, using cement primarily as a setting agent rather than the main binding source. By incorporating 60-90% glass aggregate with controlled pozzolanic materials, the system achieves strength through pozzolanic reactions rather than relying on high cement content, enabling both high recycled content and adequate mechanical properties.
3Quantity of substance
If glass aggregate is substituted for traditional sand or crushed marble, then recycled content is improved, but porosity and hydraulic permeability increase
Solution Approach 1:
The patent modifies the particle size distribution and surface characteristics of the glass aggregate through controlled crushing and screening processes. By optimizing the gradation of glass particles and combining them with pozzolanic materials that fill voids, the system reduces porosity and hydraulic permeability while maintaining high glass content.
4Strength
If thickness is increased to meet mechanical strength requirements, then compressive strength is improved, but weight considerations limit the maximum thickness
Solution Approach 1:
The patent creates a lightweight composite material by using glass aggregate with controlled density characteristics combined with pozzolanic binders. This composite structure provides adequate mechanical strength through chemical bonding mechanisms rather than relying on mass, enabling thinner panel designs that meet both strength requirements and weight limitations.
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 high compressive and tensile strength, low porosity, moderate pH, high thermal shock resistance, and controllable brightness, suitable for large-scale production of solid surface panels with a high recycled content.
Implementation Method 1
The pozzolan component of the invention includes at least one, and preferably a combination of pozzolans, preferably selected from the following group of pozzolans: fly ash, silica fume, ground granulated blast furnace slag, metakaolin, wollastonite, micro silica, amorphous silica and finely divided glass powders.
Implementation Method 2
cementitious composition for high density, low porosity sheet-form building materials... about 5% to 20% by weight of ordinary Portland cement
Data Source
AI summary
A cementitious composition for high density, low porosity sheet-form building materials having solid surfaces is comprised of cement, pozzolans, and a high percentage of fine and/or coarse glass aggregate, preferably present in an amount which by weight is at least 60% of the composition. The cement content is relatively low, preferably in the range of about 3% to 20% by weight, and the pozzolan to cement ratio is relatively high, preferably equal to or greater than unity, but which can suitably be in the range from 0.25 to 4. The composition preferably uses recycled glass and preferably has a high recycle content. The sheet-form material made in accordance with the invention can be used to provide exposed solid surfaces, for example, surfaces for shower walls and floors, counter-tops, table-tops, and the like, where low hydraulic permeability and high compressive and tensile strength are desired.