Rubber-Particle Composite Chip Seal to Reduce Aggregate Shedding
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Solution Overview
Problem
Existing chip seal technologies face issues such as aggregate shedding due to protruding edges, poor adhesion between waste rubber particles and asphalt, and high construction costs, leading to reduced structural strength and increased noise and vibration.
Innovation Solution
A rubber particle-doped composite chip seal using pre-treated waste rubber particles as fine aggregates, combined with SBS-modified emulsified asphalt, to improve adhesion and reduce shedding, while maintaining structural integrity and sound absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If waste rubber particles are used as fine aggregate in chip seal, then recycling efficiency is improved and shock absorption performance is enhanced, but adhesion between rubber particles and asphalt deteriorates due to lack of polarity
Solution Approach 1:
The patent applies preliminary action by pre-treating waste rubber particles with oxidation-urea modification before incorporating them into the chip seal. This pre-treatment introduces polar groups (carbonyl, imidogen, amide groups) onto the rubber particle surface, enabling better adhesion with asphalt. The pre-treatment step is performed in advance to prepare the rubber particles for their final function in the chip seal mixture.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical properties of rubber particle surfaces through oxidation-urea treatment. This changes the surface polarity from non-polar to polar, transforming the infiltration type from hydrophobic to hydrophilic. The modification increases surface roughness and bonding strength, thereby improving adhesion between rubber particles and asphalt while maintaining the recycling benefits.
2Device complexity
If single gradation is used in chip seal, then construction process is simplified, but aggregate shedding increases due to protruding edges and corners
Solution Approach 1:
The patent applies segmentation by dividing the aggregate mixture into two distinct size categories: coarse aggregate (4.75-7.1mm) and fine aggregate (1.18-2.36mm rubber particles). This segmentation allows each aggregate type to fulfill specific functions - coarse aggregates provide structural framework while fine rubber particles fill gaps and reduce protruding edges. The segmented approach reduces shedding while maintaining relatively simple construction processes.
Solution Approach 2:
The patent applies composite materials by combining different aggregate types (coarse gravel and fine rubber particles) with different sizes, shapes, and properties into a single chip seal mixture. This composite structure leverages the advantages of both aggregate types: the structural stability of coarse gravel and the shock absorption, flexibility, and edge-rounding properties of fine rubber particles, thereby reducing aggregate shedding.
3Strength
If composite gradation is used in chip seal, then structural strength is improved, but construction cost increases due to heating requirements and temperature control difficulties
Solution Approach 1:
The patent applies this principle by using emulsified asphalt as a binding agent instead of requiring high-temperature heating of aggregates. The emulsified asphalt provides sufficient binding strength at lower temperatures, eliminating the need for expensive heating equipment and complex temperature control systems while maintaining the structural integrity of the composite gradation chip seal.
4Strength
If more aggregates are used in composite gradation, then structural bearing capacity is improved, but binder filling space is reduced leading to insufficient embedment depth and aggregate segregation
Solution Approach 1:
The patent applies local quality by strategically distributing different aggregate types in specific zones: coarse aggregates (4.75-7.1mm) form the structural framework providing bearing capacity, while fine rubber particles (1.18-2.36mm) fill the interstitial spaces and binder filling zones. This local differentiation ensures adequate embedment depth and prevents segregation, as each aggregate size is positioned where it optimally contributes to structural performance.
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 solution enhances the adhesion and stability of the chip seal, reduces shedding and noise, and improves shock absorption, thereby extending the pavement's service life and reducing construction costs.
Implementation Method 1
polar hydrophilic groups such as carbonyl, imidogen and amide groups are introduced successfully on the rubber surface by oxidation-urea modification
Implementation Method 2
a styrene-butadiene-styrene (SBS)-modified emulsified asphalt binding and encapsulating the coarse aggregate and the fine aggregate into a whole
Data Source
AI summary
A rubber particle-doped composite chip seal and a construction method thereof. The rubber particle-doped composite chip seal includes a coarse aggregate in a lower layer, a fine aggregate in an upper layer, and an SBS-modified emulsified asphalt binding and encapsulating the coarse aggregate and the fine aggregate into a whole, wherein the coarse aggregate is a gravel having a particle size of 4.75 mm to 7.1 mm, the fine aggregate is rubber particles having a particle size of 1.18 mm to 4.75 mm after pre-treatment, and the fine aggregate has a doping amount of 30% to 45% of a volume of all aggregates.