Cementitious Armor Panels with Self-Leveling Core
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Solution Overview
Problem
Conventional cementitious compositions used for making ultra-high strength panels have poor flow properties, require excessive water for self-leveling, and lack sufficient compressive strength to resist ballistic and blast loads, making them difficult to process and ineffective in providing adequate protection.
Innovation Solution
A cementitious core composition made with a unique combination of inorganic and organic materials, including Portland cement, silica sand, silica fume, polycarboxylate-based self-leveling agents, and water, without silica flour, which develops ultra-high compressive strength and self-leveling behavior, combined with a fiber-reinforced skin for enhanced resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cementitious compositions are used to achieve ultra-high strength panels, then compressive strength can be improved, but flow properties deteriorate and excessive water is required
Solution Approach 1:
The patent changes the chemical composition parameters by replacing silica flour with silica sand (150-450 micron particle size) and adjusting the water-cement ratio to achieve optimal balance between strength and workability. This parameter modification allows the mixture to maintain self-leveling properties while developing ultra-high compressive strength (20,000 psi) without excessive water.
Solution Approach 2:
The patent creates a composite cementitious composition combining Portland cement, silica sand, silica fume, and polycarboxylate-based superplasticizer. This composite material structure enables simultaneous achievement of self-leveling flow properties and ultra-high compressive strength, resolving the contradiction between ease of manufacture and strength.
2Ease of manufacture
If silica flour is used in the cementitious composition, then workability is improved, but compressive strength is insufficient for ballistic and blast resistance
Solution Approach 1:
The patent changes the particle size parameter from silica flour (fine) to silica sand (150-450 micron), which fundamentally alters the mixture's rheological properties. This parameter change enables the composition to achieve both self-leveling workability and ultra-high compressive strength (20,000 psi) required for ballistic and blast resistance.
Solution Approach 2:
The patent replaces expensive silica flour with more economical silica sand while achieving superior performance. The silica sand provides both workability and the necessary strength, eliminating the need for the more expensive and less effective silica flour.
3Ease of manufacture
If excessive water is added to improve flow properties, then self-leveling is enhanced, but compressive strength and panel integrity are reduced
Solution Approach 1:
The patent changes the water-cement ratio parameter and replaces silica flour with silica sand, which enables achieving self-leveling properties without excessive water. The modified composition maintains adequate flow properties for self-leveling while developing ultra-high compressive strength (20,000 psi), thus resolving the contradiction between self-leveling capability and strength.
Solution Approach 2:
The patent achieves the desired flow properties and strength characteristics by copying the successful composition formula from the invention rather than following conventional approaches. The specific combination of silica sand, silica fume, and polycarboxylate superplasticizer replicates optimal performance without requiring excessive water.
4Device complexity
If conventional cement compositions are used, then manufacturing simplicity is maintained, but resistance to ballistic and blast loads is insufficient
Solution Approach 1:
The patent employs a composite cementitious material consisting of Portland cement, silica sand, silica fume, and polycarboxylate-based superplasticizer. This composite formulation provides ultra-high compressive strength (20,000 psi) for ballistic and blast resistance while maintaining manufacturing simplicity through a straightforward mixing process that achieves self-leveling without complex equipment.
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 enables the production of panels with compressive strengths up to 20,000 psi and self-leveling properties, allowing for easy formation and attachment to frames, providing effective resistance to ballistic and blast loads without the need for excessive water.
Implementation Method 1
about 0.75-2.5% by weight of the total composition of an organic based self-leveling chemical agent, based upon polycarboxylated chemistry, preferably polycarboxylated polyether
Implementation Method 2
an inorganic cementitious binder, typically hydraulic cement such as portland cement
Implementation Method 3
a pozzolanic micro filler, preferably silica fume of average particle size of about 0.1 micron
Implementation Method 4
A variety of skins can be used to laminate the core of the cementitious armor panel. However, fiber reinforced polymer (FRP) laminates as skins are preferred.
Data Source
Figure 1~1A
Figure 1B~3
Figure 4~5
AI summary
A cementitious panel with ballistic and blast resistant properties having a core layer of ultra-high compressive strength composite and at least one skin layer. The panels can also be used in walls, ceiling and flooring panels which require high compressive strength for resistance to earthquakes and surfaces resistant to surface abuse such as in prison and other institutions. The panel core layer has a continuous cementitious phase resulting from the curing of an aqueous mixture, in the absence of silica flour, of inorganic cement binder, inorganic mineral filler having a particle size of about 150-450 microns, a pozzolanic mineral filler, polycarboxylate based superplasticizer, alkanolamine and acid or alkali metal acid salt; and water. The mixture may be uniformly reinforced with fiber added before curing. The cementitious core layer is then reinforced with the skin, such as fiber reinforced polymer, attached to at least one panel surface.