Wire Mesh Shell Carbon-Fixed Aggregate for Erosion-Resistant Pervious Concrete
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Solution Overview
Problem
Pervious concrete is susceptible to water erosion and has limited carbon fixation efficiency due to the use of pumice aggregates, while agricultural mulch films and drip irrigation belts are not effectively recycled, leading to environmental and economic challenges.
Innovation Solution
A preparation method for a PE waste material-based carbon-fixed aggregate with a wire mesh shell, involving pretreatment, carbon fixation, and high-temperature calcination to form a flexible multilayer shell, enhancing mechanical properties and carbon fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pumice aggregates with open pore structure are used for carbon fixation, then carbon absorption capacity is improved, but CO2 attachments float on the surface and fall off during secondary mixing, resulting in carbon loss
Solution Approach 1:
A flexible polymer shell is formed around the pumice aggregate through hot-melt extrusion granulation. This shell encapsulates the CO2 attachments on the aggregate surface, preventing them from floating off during secondary mixing and preparation processes, thereby retaining the carbon fixation amount.
Solution Approach 2:
The invention creates a composite structure combining pumice aggregate with polymer material. The polymer shell surrounds the pumice core, forming a composite aggregate that maintains both the carbon fixation capability of pumice and the protective encapsulation function of the polymer shell.
2Productivity
If pumice-based pervious concrete aggregate is used, then rainwater infiltration and groundwater recharge are improved, but long-term water erosion aggravates damage to pervious concrete, resulting in insufficient service life
Solution Approach 1:
The polymer shell formed around the pumice aggregate acts as a protective layer that resists water erosion. This shell prevents direct water contact with the pumice aggregate structure, reducing erosion damage and extending the service life of pervious concrete while maintaining rainwater infiltration capability.
Solution Approach 2:
The polymer shell serves as a protective coating that can be applied to the aggregate surface. This shell provides erosion resistance without requiring complex structural changes to the pumice aggregate itself, offering a cost-effective solution to extend service life.
3Ease of repair
If waste mulch films and drip irrigation belts are recycled through recovery and regeneration, then material utilization is improved, but advanced techniques and devices are required, increasing recycling cost
Solution Approach 1:
The invention uses a simple hot-melt extrusion granulation process to form polymer shells around aggregates. This straightforward process converts waste PE materials into functional shell coatings without requiring complex recovery and regeneration equipment, significantly reducing recycling costs while achieving effective material utilization.
Solution Approach 2:
The process changes the physical state of waste PE materials from solid films/belts to molten polymer through heating during extrusion granulation. This parameter change enables simple processing and formation of shell coatings, avoiding complex chemical or mechanical recovery processes.
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 method improves water erosion resistance and carbon fixation efficiency, effectively recycling waste materials and optimizing the performance of pervious concrete aggregates.
Implementation Method 1
pumice has a pore structure with a specified carbon fixation ability, which can improve the performance of an aggregate itself while avoiding the dioxide carbon emission through carbon mineralization
Implementation Method 2
feeding into a hot-melt extrusion granulator for granulation to produce spherical-like PE waste particles
Implementation Method 3
high-temperature calcination to form a wire mesh shell skeleton
Implementation Method 4
high-temperature calcination to form a wire mesh shell skeleton
Implementation Method 5
spraying 0.7 parts to 0.9 parts of a sodium silicate solution with a concentration of 1% on a surface of 97 parts to 114 parts of the carbon-fixed pumice
Data Source
AI summary
A PE waste material-based carbon-fixed aggregate with a wire mesh shell, and a preparation method of the PE waste material-based carbon-fixed aggregate are provided. The preparation method includes the following steps: S1, pretreatment of a PE material collected; S2, carbon fixation for a pumice to produce a carbon-fixed pumice; S3, preparation of a powder-adsorbed pumice; S4, high-temperature calcination to form a wire mesh shell skeleton; and S5, post-treatment. By providing the PE waste material-based carbon-fixed aggregate with the wire mesh shell and the preparation method of the PE waste material-based carbon-fixed aggregate, achieving the comprehensive and effective recycling of waste agricultural mulch films and drip irrigation belts while solving the problems that pervious concrete is susceptible to water erosion and aggregates have poor carbon fixation and sequestration effects.