Cement Pervious Pavement with TiO2 Photocatalysis
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Solution Overview
Problem
Existing cement-based pervious pavement structures lack air purification capabilities and are costly, making them unsuitable for widespread use in urban areas with severe nitrogen oxide pollution, while also being energy-intensive and environmentally harmful.
Innovation Solution
A cement-based pervious pavement structure incorporating a lower structural layer and an upper surfacing layer with specific compositions, including titanium dioxide as a photocatalyst to degrade nitrogen oxides, waste glass as aggregate, and a double-layer design for optimal water permeability and strength, reducing material costs and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional cement-based pervious pavement structures are used, then water permeability is achieved, but air purification capability is lacking and cost is high
Solution Approach 1:
The patent changes the chemical composition parameters of the cement-based material by incorporating titanium dioxide (0.5-2.0 parts by weight) and other functional additives, transforming it from a simple structural material to one with photocatalytic air purification capabilities. This parameter change enables the pavement to degrade nitrogen oxides while maintaining cost-effectiveness through optimized formulation
Solution Approach 2:
The patent creates a composite material system combining cement, titanium dioxide, waste glass aggregate, and functional additives. This composite structure integrates both structural functionality and air purification capability, resolving the contradiction between cost and harmful factor removal by using readily available materials in optimized proportions
2Object-affected harmful factors
If pervious pavement materials with high voidage are applied, then water permeability is improved, but structural strength may be compromised
Solution Approach 1:
The patent applies local quality by creating a dual-layer structure where the upper layer (15-25 mm thick) contains titanium dioxide and functional additives for air purification and has specific voidage characteristics for water permeability, while the lower layer provides robust structural support. This localized differentiation resolves the contradiction between water permeability and structural strength
Solution Approach 2:
The patent utilizes porous cement-based materials with controlled voidage in the upper layer to achieve high water permeability (exceeding 77 mm/hr), while the overall dual-layer structure and material composition maintain required structural strength (compressive strength greater than 28 MPa)
3Object-affected harmful factors
If photocatalytic materials are added to achieve air purification, then nitrogen oxide removal is enabled, but material cost increases
Solution Approach 1:
The patent optimizes the quantity of titanium dioxide to 0.5-2.0 parts by weight per 100 parts by weight of cement, finding the cost-effective threshold where sufficient photocatalytic activity is achieved without excessive material cost. This parameter optimization resolves the contradiction between air purification capability and material cost
Solution Approach 2:
The patent uses titanium dioxide and other functional additives in controlled, economical quantities that provide the necessary air purification function without requiring expensive material formulations, achieving cost-effective pollution remediation
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 structure achieves effective nitrogen oxide removal, high water permeability, and enhanced sliding resistance, addressing urban pollution and flooding issues while being cost-effective and environmentally friendly, with a compressive strength greater than 28 MPa and water permeability exceeding 77 mm/hr.
Implementation Method 1
incorporating a lower structural layer and an upper surfacing layer with specific compositions, including titanium dioxide as a photocatalyst to degrade nitrogen oxides
Data Source
AI summary
The present application relates to the technical field of road infrastructure, and provides a cement-based pervious pavement structure, a manufacturing method of the cement-based pervious pavement structure, and an application of the cement-based pervious pavement structure. The cement-based pervious pavement structure includes: a lower structural layer as the base; an upper surfacing layer overlaid on said lower structural layer and including: 1.0-2.0 parts by weight of upper layer (fine) aggregate; 0.40-0.70 part by weight of cement; 0.02-0.03 part by weight of titanium dioxide; 0.03-0.04 part by weight of water reducing agent; 0.001-0.002 part by weight of defoamer. The cement-based pervious pavement structure provided by the present application can provide air purification function taking into account the practical cost.