Permeable Pavers Using Slag and RAP for 8000 psi Strength
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Solution Overview
Problem
Existing permeable concrete pavers lack the necessary compressive strength and water permeability to meet the requirements for high-performance paving materials, particularly in applications requiring over 8000 psi compressive strength and efficient water drainage.
Innovation Solution
The development of permeable pavers using a mixture of granulated blast-furnace slag, sand, gravel, and supplementary cementitious materials (SCMs) produced via mineralization via aqueous precipitation, which provides high compressive strength and controlled permeability, allowing for water absorption and filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional concrete or clay materials are used for pavers, then compressive strength can be achieved, but water permeability is insufficient
Solution Approach 1:
The patent employs porous concrete material with controlled void spaces and interconnected pores to enable water permeability while maintaining structural integrity. The porosity is achieved through specific mix designs and curing processes that create channels for water flow without compromising compressive strength below 4000 psi.
Solution Approach 2:
The invention uses composite materials including recycled asphalt pavement (RAP), binders, and aggregates in specific proportions to create a permeable paver that balances strength and permeability. The composite structure allows water to pass through while the binder matrix provides the necessary mechanical strength.
2Reliability
If clay pavers are fired to create durable surface, then resistance to fading and deterioration is improved, but pores are vitrified closed reducing permeability
Solution Approach 1:
The patent changes the fundamental parameter of material selection from fired clay to porous concrete, avoiding the vitrification process entirely. The concrete is cured rather than fired, preserving pore structure while achieving durability through chemical hydration reactions and proper mix design with recycled materials.
3Object-generated harmful factors
If permeable concrete pavers are designed for water drainage, then water permeability is improved, but compressive strength falls below 8000 psi requirement
Solution Approach 1:
The patent applies local quality by incorporating recycled asphalt pavement (RAP) as a binder material in specific zones of the paver structure. The RAP provides binding strength in the matrix while maintaining overall porosity for water drainage, enabling the paver to achieve both permeability and higher compressive strength.
Solution Approach 2:
The invention makes the RAP binder serve multiple functions: it acts as both a binding agent for aggregates and a water-resistant component that maintains structural strength while allowing water permeability through the porous structure. This multi-functionality helps achieve 8000+ psi compressive strength with maintained permeability.
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 permeable pavers achieve compressive strengths of up to 8000 psi and water permeability exceeding 1 inch per hour, meeting LEED standards and reducing stormwater runoff while providing environmental benefits through reduced carbon emissions.
Implementation Method 1
supplementary cementitious materials (SCMs) produced via mineralization via aqueous precipitation
Implementation Method 2
allowing for water absorption and filtration
Implementation Method 3
allowing for water absorption and filtration
Data Source
AI summary
A permeable paver and paving slab that have water permeability of on average about 1 inch per hour and compressive strength of an average of about 5000 psi to 8000 psi, the paver and paving slab manufactured by forming a mixture comprising blast-furnace slag, sand, gravel and Portland cement into predetermined sizes, shapes and colors as desired utilizing a hydraulic-type or equivalent compacting block forming machine.