Recycled-Material Structural Concrete for Lower Density and Insulation
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Solution Overview
Problem
Current structural lightweight concrete is limited in residential building applications due to inflexibility, high material and labor costs, and lack of understanding of its matrix mechanics, leading to poor performance and high production complexity.
Innovation Solution
A lightweight concrete mixture using calcium sulfoaluminate cement, fiberglass rebar, and lightweight aggregates made from recycled materials such as foamed glass, which are combined with a specialized grout to create a strong, insulative, and cost-effective material suitable for building construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If standard lightweight aggregate materials (expanded shale, pumice, volcanic tuffs) are used to produce lightweight concretes, then the concrete achieves lower density and insulating properties, but the material cost and production complexity increase significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the cement binder by specifying a blend of Portland cement (30-70 parts), calcium aluminate cement (10-40 parts), and calcium sulfoaluminate cement (10-40 parts). This parameter change in binder composition allows the use of cheaper, more readily available lightweight aggregates while maintaining structural strength and reducing production complexity compared to using traditional high-performance cement alone.
Solution Approach 2:
The patent creates a composite concrete system combining multiple cement types (Portland, calcium aluminate, calcium sulfoaluminate) with lightweight aggregates and specific admixtures. This composite approach leverages the strengths of each component to achieve the desired balance between density reduction and manufacturing ease, avoiding the need for expensive specialized materials.
2Weight of moving object
If lightweight aggregates are used to reduce concrete density, then insulating properties improve, but structural strength may be compromised
Solution Approach 1:
The patent adjusts the cement binder composition parameters to ensure adequate compressive strength (2,500-5,000 psi) while maintaining low density. The specific ratio ranges of Portland cement (30-70 parts), calcium aluminate cement (10-40 parts), and calcium sulfoaluminate cement (10-40 parts) are optimized to provide sufficient structural strength with lightweight aggregates.
Solution Approach 2:
The patent applies different quality requirements to different components: the cement binder is designed with high strength characteristics to provide structural support, while the lightweight aggregates are designed with low density characteristics for insulation. This local differentiation of material properties allows the concrete as a whole to achieve both strength and lightness.
3Ease of manufacture
If conventional Portland cement is used alone, then material cost is reduced, but early strength development and durability are insufficient
Solution Approach 1:
The patent creates a composite cement system combining Portland cement (30-70 parts) with calcium aluminate cement (10-40 parts) and calcium sulfoaluminate cement (10-40 parts). This composite binder provides early strength development and improved durability while remaining cost-effective compared to using high-performance specialized cements alone.
Solution Approach 2:
The multi-component cement binder serves multiple functions simultaneously: Portland cement provides bulk and cost-effectiveness, calcium aluminate cement contributes to early strength and sulfate resistance, and calcium sulfoaluminate cement enhances early strength development and reduces shrinkage. This multi-functionality achieves reliable durability without significantly increasing material cost.
4Strength
If fiberglass rebar is used to suspend lightweight aggregates, then structural integrity and tensile strength are improved, but material cost increases
Solution Approach 1:
The patent applies reinforcement selectively where needed: fiberglass rebar is used to provide tensile strength and structural integrity in critical areas, while the bulk of the concrete mixture relies on the interlocked lightweight aggregates and optimized binder. This localized application of expensive reinforcement minimizes overall material cost while achieving adequate tensile strength.
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 provides a lightweight concrete with structural strength, improved insulating properties, and reduced environmental impact, enabling cost-effective use in residential and civil engineering projects while maintaining high compressive and tensile strength.
Implementation Method 1
the CSA cement comprising lithium silicate formed from a reaction with a concrete lithium densifier
Implementation Method 2
lightweight aggregates (LWA) suspended by a fiberglass rebar
Data Source
AI summary
A lightweight concrete including calcium sulfoaluminate (CSA) cement, the CSA cement comprising lithium silicate formed from a reaction with a concrete lithium densifier, a grout comprising one or more types of Portland cement, and lightweight aggregates (LWA) suspended by a fiberglass rebar, wherein a ratio of the CSA cement to the LWA is 60/40 by weight.