Jointless Concrete Composite Pavement for Crack-Resistant Slabs
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Solution Overview
Problem
Existing exterior concrete pavements require contraction joints to control cracking, which lead to deterioration, uneven surfaces, and damage to vehicles and equipment, and traditional solutions fail to adequately address these issues.
Innovation Solution
A composite pavement structure comprising a gap-graded concrete layer and a flexural-hardening fiber reinforced mortar layer, eliminating the need for contraction joints by providing enhanced structural stability and crack resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If contraction joints are used to control cracking, then crack location is controlled, but joint deterioration and uneven surfaces occur leading to vehicle damage
Solution Approach 1:
The invention removes contraction joints entirely from the pavement system. By using a jointless concrete composition with modified mix design (including fiber reinforcement, specific aggregate size distribution, and admixtures), the pavement controls cracking through material properties rather than mechanical joints, eliminating the source of joint deterioration while maintaining crack control
Solution Approach 2:
The invention uses a composite concrete material system combining multiple components: fibers (synthetic and/or steel), specific aggregate size distributions, water-reducing admixtures, and other additives. This composite approach provides both crack control and durability without requiring traditional contraction joints
2Manufacturing precision
If saw cutting contraction joints is performed, then crack location is controlled, but heavy equipment dust and noise are produced
Solution Approach 1:
The invention eliminates the need for saw cutting operations by removing contraction joints from the pavement design. Crack control is achieved through the jointless concrete composition itself, thereby eliminating the harmful dust and noise associated with heavy equipment saw cutting
Solution Approach 2:
The invention replaces the mechanical process of saw cutting joints with a material-based solution. Instead of using heavy equipment to create physical joints, the crack control function is achieved through the chemical and physical properties of the jointless concrete composition
3Manufacturing precision
If contraction joints are used to control cracking, then cracking is localized, but D-cracking, curling, and subgrade washout occur
Solution Approach 1:
The invention removes contraction joints that serve as initiation points for deterioration processes. By controlling cracks through material composition rather than joints, the pavement prevents D-cracking, curling, and subgrade washout that typically originate at joint locations
Solution Approach 2:
The invention converts the potential harm of uncontrolled random cracking into controlled micro-cracking distributed throughout the jointless concrete matrix. The fiber reinforcement and modified composition transform what would be harmful concentrated cracks at joints into beneficial distributed micro-cracks that don't initiate deterioration
4Manufacturing precision
If joint spacing is reduced to control cracking, then crack control improves, but device complexity and construction time increase
Solution Approach 1:
The invention eliminates the entire joint system including joint spacing requirements. By using jointless concrete composition with fiber reinforcement and specific mix design, the pavement achieves crack control without any joints, thereby eliminating joint plan complexity and construction time associated with multiple joint locations
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 composite pavement effectively prevents cracking and joint deterioration, reducing maintenance costs and improving durability, while allowing for thinner slabs that can withstand increased loads and environmental changes.
Implementation Method 1
an expansive concrete additive in an amount effective to increase a volume of the concrete mixture
Implementation Method 2
a flexural-hardening fiber reinforced mortar second layer
Data Source
AI summary
A pavement system that avoids the need for traditional contraction joints regardless of dimension of the pavement. The concrete composite pavement, comprises (i) a gap-graded concrete first layer; (ii) a flexural-hardening fiber reinforced mortar second layer, wherein the gap-graded concrete comprises cement, water and coarse aggregate, the flexural-hardening fiber reinforced mortar comprises cement; water, fine aggregate with a maximum particle size; fiber reinforcement comprising of synthetic and/or metal fibers; wherein the total thickness of the composite pavement is selected depending on the required maximum service point load, using the following formula H=(F/100)0.5×100 mm, where H is the total thickness of the composite pavement and F is maximum service point load; wherein the ratio of the thickness of flexural-hardening fiber reinforced mortar second layer to the total thickness of the composite pavement is within the range of 1:5 to 2:5.