Red Mud Modified Asphalt Porous Pavement Purification
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Solution Overview
Problem
Current porous asphalt pavements face limitations in pollutant purification and mechanical durability, with existing solutions being costly, complex, and lacking durability, which hinders their large-scale application in road construction.
Innovation Solution
The use of red mud modified asphalt pavement materials, comprising high-viscosity asphalt, red mud, and aggregate, with specific mass ratios and properties, enhances both pollutant absorption and mechanical strength, improving purification and anti-dispersion performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If composite modified photocatalyst (porous carbon molecular sieves, copper-carbon nanotubes, co-doped TiO2) is added to porous asphalt pavement, then pollutant purification effect is improved, but cost increases, process complexity increases, and durability decreases
Solution Approach 1:
The patent extracts and removes the complex photocatalyst components (porous carbon molecular sieves, copper-carbon nanotubes, co-doped TiO2) from the asphalt pavement system, replacing them with simple red mud particles that provide purification functionality without the associated complexity and cost issues
Solution Approach 2:
The patent replaces expensive, complex photocatalyst materials with inexpensive red mud, a readily available industrial waste product. This substitution maintains purification functionality while dramatically reducing material cost and simplifying the overall system
2Strength
If resin is added to improve anti-rutting performance of porous asphalt pavement, then mechanical properties are improved, but stability decreases after high temperature exposure due to aging
Solution Approach 1:
The patent changes the chemical composition parameters of the asphalt binder by incorporating red mud particles, which modify the rheological properties and thermal stability of the binder system, thereby improving high-temperature performance without the aging issues associated with resin additives
Solution Approach 2:
The patent creates a composite material system where red mud particles are integrated into the asphalt binder matrix, forming a new composite binder that combines the adhesive properties of asphalt with the stabilizing effects of red mud, achieving improved mechanical properties and thermal stability
3Object-affected harmful factors
If porous structure is maintained in asphalt pavement, then pollutant absorption capability is improved, but mechanical strength decreases making the pavement susceptible to blocking under vehicle pressure
Solution Approach 1:
The patent applies local quality enhancement by incorporating red mud particles specifically in the binder phase surrounding the aggregate particles, creating localized reinforcement zones that strengthen the porous structure without filling the macro pores needed for pollutant absorption
Solution Approach 2:
The patent utilizes red mud particles as porous filler material that maintains the overall porous structure of the pavement while providing local structural reinforcement. The red mud particles themselves have porous characteristics that contribute to pollution absorption while their rigid structure strengthens the binder matrix
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 red mud modified asphalt pavement achieves a high purification rate of pollutants, including suspended matter, heavy metals, and biochemical pollutants, while maintaining excellent mechanical properties such as anti-rutting and freezing-thawing stability, making it suitable for large-scale road construction.
Implementation Method 1
the purification effect is limited in normal permeable asphalt pavement... Therefore, it is necessary to specially add catalysts to degrade the pollutants... red mud modified asphalt pavement materials... enhances both pollutant absorption and mechanical strength
Implementation Method 2
The asphalt is high-viscosity asphalt, and the viscosity of the high-viscosity asphalt is greater than 20,000 Pa·s... the mass ratio of the total mass of asphalt and red mud to aggregate is (0.08-0.12):1
Data Source
AI summary
The present disclosure provides asphalt modified red mud for porous pavement material and an application thereof. The porous asphalt pavement material includes asphalt, red mud and aggregate; the mass ratio of asphalt to red mud is 1:(0.10-0.15), the mass ratio of the total mass of asphalt and red mud to aggregate is (0.08-0.12):1. With regard to the asphalt modified with red mud for porous pavement material provided in the present disclosure, asphalt is modified with red mud, and aggregate is added to synergize with red mud so as to improve the purification properties and mechanical properties of the porous asphalt pavement material efficiently. In the embodiments of the present disclosure, the purification rate of suspended matter by the asphalt modified with red mud for porous pavement material reaches 54.9-58.6%, and the purification rate of heavy metals (iron and lead) reaches 34.3-46.1%.