Non-Metallic DSECC Pipe Structure for Crack-Resistant Thin Walls
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Solution Overview
Problem
Conventional concrete pipes are prone to cracking due to low tensile strength, which compromises their durability, especially when exposed to water, and require metallic reinforcement for structural integrity.
Innovation Solution
Development of desert sand engineered cementitious composite (DSECC) pipes that are fully non-metallic, using a cement binder, unprocessed desert sand, and polymer fibers, eliminating the need for metallic reinforcement and allowing for a thinner wall thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional concrete is used to make pipes, then the pipe structure is simple and easy to manufacture, but the tensile strength is low and the pipe is prone to cracking
Solution Approach 1:
The patent uses Engineered Cementitious Composite (ECC) material that combines cementitious binder, fine aggregates, and polymer fibers to create a composite material with superior tensile strength. The polymer fibers (polyethylene and/or polypropylene) are distributed throughout the concrete matrix to provide reinforcement and prevent crack propagation, achieving high tensile strength without requiring separate steel reinforcement elements.
2Reliability
If metallic reinforcement members are added to concrete pipes, then the structural strength and durability are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the functions of concrete and steel reinforcement into a single integrated ECC material system. The polymer fibers are embedded directly into the cementitious matrix during mixing, creating a homogeneous composite where the reinforcement and base material work together as one unit, eliminating the need for separate steel reinforcement members and their associated complex placement and bonding requirements.
Solution Approach 2:
The patent replaces expensive, complex metallic reinforcement with simpler, more cost-effective polymer fibers that are inexpensive to incorporate into the concrete mix. The polymer fibers provide sufficient reinforcement for the intended application lifecycle without requiring the complex steel reinforcement cages used in conventional concrete pipes.
3Weight of moving object
If conventional concrete pipes are used, then the material is readily available and easy to manufacture, but the pipe weight is high and material costs increase
Solution Approach 1:
The patent changes the material parameters by using ECC with optimized cementitious binder content, fine aggregate gradation, and polymer fiber dosage. This results in a material that achieves the required structural performance with reduced density and volume compared to conventional reinforced concrete pipes, thereby reducing both weight and material quantity required.
4Strength
If the pipe wall thickness is reduced, then the material quantity and weight are decreased, but the structural strength and crack resistance are compromised
Solution Approach 1:
The patent uses the enhanced crack resistance properties of ECC composite material, where the polymer fibers bridge microcracks and prevent their propagation. This allows the pipe wall to be made thinner while maintaining crack resistance, as the ECC material can sustain tensile stresses and prevent crack development even in thinner sections.
Solution Approach 2:
The patent employs the ductile and flexible nature of ECC material that can accommodate deformations in thin-walled structures without cracking. The polymer fiber reinforcement provides flexibility and toughness to the thin pipe wall, enabling it to resist cracking under load despite the reduced thickness.
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
DSECC pipes exhibit improved tensile strength and ductility, maintaining structural integrity under load and resisting water penetration, while reducing material costs and weight, offering a safer and more cost-effective alternative to conventional reinforced concrete pipes.
Implementation Method 1
a cement binder, unprocessed desert sand, and polymer fibers selected from polyethylene fibers, polypropylene fibers, and a combination thereof
Implementation Method 2
a cement binder, unprocessed desert sand, and polymer fibers
Data Source
AI summary
A pipe includes a tubular body made entirely of a desert sand engineered cementitious composite (DSECC) made with a cement binder, unprocessed desert sand, and polymer fibers selected from polyethylene fibers, polypropylene fibers, and a combination thereof. The tubular body has a wall with a thickness that is less than 22 percent of an inner diameter of the pipe. The pipe is fully non-metallic.