Recycled Drywall Masonry Blocks With Waste-Derived Binder
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Solution Overview
Problem
There is a need for beneficial alternatives to recycled drywall waste materials due to limited uses and low demand, leading to high landfill disposal rates, which generates offensive odors and environmental concerns.
Innovation Solution
Recycled drywall waste is processed into composite mixtures, forming high-strength load-bearing solid or hollow-shaped units, such as gypsum wallboard waste blocks (GWWBs) and drywall waste blocks (DWBs), incorporating a high percentage of demolition waste and replacing Portland cement with waste-derived binders, while utilizing the outer facing paper to simplify processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If drywall waste is landfilled, then disposal is simple, but environmental harm increases (offensive odors, H2S gas)
Solution Approach 1:
The patent converts harmful drywall waste into beneficial masonry materials by recycling it into composite blocks and pavers. The waste that would otherwise generate H2S gas and odors is transformed into useful construction products, eliminating the harmful environmental effects while creating economic value.
Solution Approach 2:
Instead of discarding drywall waste in landfills, the patent recovers it by processing it into reusable masonry materials. The recycling process recovers the gypsum core and paper facing layers, transforming waste into valuable construction resources that can be used in new builds and renovations.
2Productivity
If recycled drywall waste is used in traditional applications, then recycling increases, but demand remains low due to limited uses
Solution Approach 1:
The patent creates multi-functional masonry products that can serve various purposes: load-bearing walls, non-load-bearing partitions, paving surfaces, and decorative elements. This universal application approach expands the market for recycled drywall waste beyond traditional single-use applications.
Solution Approach 2:
The patent develops composite masonry materials combining recycled drywall with various aggregates and binders to create products with enhanced properties. These composite materials achieve both structural integrity and aesthetic appeal, enabling widespread adoption in diverse construction applications.
3Object-generated harmful factors
If drywall waste is processed into masonry materials, then environmental benefit increases, but processing complexity increases
Solution Approach 1:
The patent segments the drywall waste processing into distinct stages: collection and sorting, comminution and sizing, mixing with aggregates and binders, and forming into final products. This segmentation allows each stage to be optimized independently and facilitates modular processing system design.
Solution Approach 2:
The patent controls processing parameters such as particle size distribution, moisture content, binder-to-aggregate ratios, and compaction density to optimize product performance. By carefully managing these parameters, the process achieves high-quality recycled materials while maintaining operational efficiency.
4Productivity
If high percentage of demolition waste is used, then recycling value increases, but material consistency decreases
Solution Approach 1:
The patent applies local quality control by sorting and processing different types of drywall waste separately before combining them. Different waste streams (e.g., clean drywall vs. contaminated drywall) are processed to appropriate standards and then integrated, ensuring consistent final product quality while maximizing recycling content.
Solution Approach 2:
The patent implements feedback mechanisms to monitor and adjust material composition during processing. Quality control testing at various stages allows real-time adjustments to mixing ratios, particle size distribution, and other parameters to maintain consistent product performance despite variations in waste input.
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 resulting products exhibit superior compressive strength, thermal insulation, and water resistance, reducing material costs and skill requirements for construction, making them suitable for masonry applications and small-scale building projects.
Implementation Method 1
formed under pressure into example embodiments, such as, drywall waste blocks (DWBs) and/or gypsum wallboard waste blocks (GWWBs)
Implementation Method 2
resistance to thermal conductivity ranging from 0.266 m2K/W down to 0.251 m2K/W
Implementation Method 3
a resultant percent water absorption of 26.5 up to 36.3
Data Source
AI summary
The embodiments herein are directed to dry wall waste mixtures, formed under pressure into example embodiments referred to herein as dry wall waste blocks (DWBs) and/or gypsum wallboard waste blocks (GWWBs) and tile structures. DWBs/GWWBs mixtures in particular, often incorporate a higher percentage in the composite mixtures from about 60% up to 85% of dry wall waste than other mixtures and beneficially often incorporates substantially all of the wallboard facing paper as part of the composite mixture. That is, waste processing is simplified by comingling core and paper layers in the final product. DWBs/GWWBs mixtures utilize demolition and construction waste, replacing a high percentage of Portland cement with waste-derived binder.