Biodegradable Corn Starch Polypropylene Concrete Test Mold
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Solution Overview
Problem
Conventional plastic test cylinder molds for concrete specimens are not recyclable due to specific polypropylene grades, leading to environmental issues as they often end up in landfills instead of being recycled.
Innovation Solution
A biodegradable test cylinder mold formed from a blend of corn starch and polypropylene, with options of 40% corn starch and 60% polypropylene or one-third corn starch and two-thirds polypropylene, injection molded to create a cylindrical container suitable for concrete testing, ensuring the mold can degrade and be recycled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polypropylene molds are used, then the molds are durable and reusable, but they cannot be recycled due to specific polypropylene grades and end up in landfills
Solution Approach 1:
The patent applies composite materials by combining corn starch (biodegradable component) with polypropylene (structural component) in specific ratios (20-40% corn starch, 60-80% polypropylene). This composite approach allows the mold to maintain the durability and structural integrity of polypropylene while incorporating the biodegradability of corn starch, enabling both reuse during service life and subsequent recycling/composting after disposal.
2Loss of substance
If biodegradable materials are used, then the molds can be recycled and degraded, but the structural integrity may be compromised
Solution Approach 1:
The patent applies parameter changes by carefully controlling the composition ratio (20-40% corn starch, 60-80% polypropylene), molecular weight, and processing parameters of the composite material. These parameter adjustments optimize the balance between biodegradability and structural integrity, ensuring the mold maintains sufficient strength for concrete testing applications while retaining the ability to degrade after use.
3Reliability
If pure polypropylene is used, then the mold meets ASTM guidelines for concrete testing, but it contributes to environmental pollution in landfills
Solution Approach 1:
The patent applies local quality by differentiating the functional requirements of different parts of the mold. The polypropylene component provides the structural integrity and ASTM compliance needed for concrete testing, while the corn starch component provides the biodegradability for environmental sustainability. This localized functional differentiation allows the single mold to satisfy both performance and environmental requirements simultaneously.
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 biodegradable mold addresses environmental concerns by degrading into a fine powder, reducing landfill contributions and offering a recyclable 'green' product that meets ASTM guidelines for concrete specimen testing.
Implementation Method 1
The biodegradable mold addresses environmental concerns by degrading into a fine powder
Data Source
AI summary
A biodegradable test cylinder mold is used for testing concrete specimens. The mold comprises a cylindrical wall connected to a bottom wall to define a hollow, unitary cylindrical container for receiving concrete to form a test specimen. The cylindrical container is formed of a biodegradable material comprising corn starch or a blend of corn starch and plastic.