Precast Pervious Concrete Panels Layered Aggregate Design
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Solution Overview
Problem
Pervious concrete, due to its porous nature, requires a long cure time and is prone to moisture loss, cracking, and reduced strength when used in on-site construction, as it lacks immediate protection and is susceptible to dilution and temperature stresses.
Innovation Solution
The development of precast pervious concrete panels with varying aggregate sizes and layers, featuring lifting members for easy transport and apertures for connector insertion, allowing for controlled production and assembly, enhancing strength and consistency while maintaining permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pervious concrete is used in on-site construction with ready mix delivery, then the porous nature allowing water filtration is achieved, but the long cure time and susceptibility to moisture loss, cracking, and reduced strength occur
Solution Approach 1:
The patent applies preliminary action by pre-curing the pervious concrete panels in a controlled factory environment before delivery to the construction site. This allows the concrete to achieve significant strength during manufacturing, eliminating the need for prolonged on-site curing and protecting the material from environmental damage during the critical curing phase.
2Productivity
If on-site pouring of pervious concrete is performed, then immediate installation is possible, but the material is prone to dilution from water, cracking from stressing, and reduced ultimate strength due to temperature during cure time
Solution Approach 1:
The patent implements preliminary action by completing the curing process during panel fabrication in a controlled factory setting. This eliminates exposure to environmental factors such as moisture loss, temperature stress, and cracking risks during the critical curing period, while still enabling rapid installation at the construction site.
Solution Approach 2:
The patent creates pre-cured panels that replicate the desired final product in a controlled environment. These panels are essentially finished copies of the intended installation, already cured to full strength, which are then transported and installed without requiring on-site curing exposure to harmful environmental factors.
3Ease of manufacture
If single-layer pervious concrete is used, then the construction process is simplified, but the strength characteristics and water filtration performance are limited
Solution Approach 1:
The patent applies local quality by using multi-layer construction where each layer has different aggregate sizes optimized for specific functions. The bottom layer uses larger aggregates for structural strength and drainage, while upper layers use smaller aggregates for surface durability and filtration, with each layer having locally optimized properties.
Solution Approach 2:
The patent employs composite materials by combining multiple layers of pervious concrete with different aggregate compositions. This creates a composite structure where each layer contributes specific properties - structural integrity from the base layer, filtration from intermediate layers, and surface performance from the top layer - achieving superior overall performance compared to a single homogeneous layer.
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 precast panels offer improved strength, reduced material consumption, and increased durability, enabling efficient water filtration and collection while minimizing environmental impact through controlled production and assembly, thus addressing the limitations of traditional pervious concrete construction methods.
Implementation Method 1
Pervious concrete is a type of concrete that is highly porous to allow water, for example from precipitation, to pass through the concrete
Data Source
AI summary
Methods directed to a producing precast pervious concrete panels. Each pervious concrete panel has a plurality of layers of concrete mixture, wherein the aggregate used in each layer may be a different size and each layer is compacted after being laid. The method may further include providing a slip-former machine or an extruder machine to lay the layers of pervious concrete mixture.