Micro-surfacing Sealing Coat Mixture for High-Temperature Pavement Stability
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Solution Overview
Problem
Traditional emulsified asphalt slurry seals lack sufficient heat resistance and waterproofing, leading to deformation and damage under high temperatures, and are prone to temperature fatigue and reflective cracking in high-temperature regions.
Innovation Solution
A micro-surfacing sealing coat mixture comprising cationic emulsified asphalt, ethylene-1-octene copolymer, organic silicone resin, filler, aggregate, ditertiarybutyl peroxide, water, and accelerators, which improves heat resistance, chemical corrosion resistance, and water resistance through cross-linking reactions and structural reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ordinary emulsified asphalt slurry seal is used, then the pavement has smooth surface and good wear resistance, but it deforms and damages seriously under high temperature conditions
Solution Approach 1:
The patent uses modified emulsified asphalt containing polymer modifiers (such as SBS, SEBS, or EVA) combined with traditional asphalt to create a composite material that maintains the smooth surface and wear resistance of ordinary asphalt while adding high-temperature stability and elasticity to prevent deformation and cracking
Solution Approach 2:
The patent changes the chemical composition parameters of the asphalt by adding specific polymer modifiers in controlled amounts (5-20% by weight) to alter the rheological properties and temperature susceptibility of the asphalt mixture, thereby improving heat resistance without sacrificing other performance characteristics
2Temperature
If modified emulsified asphalt slurry seal is used to improve heat resistance, then thermal stability is enhanced, but waterproof effect deteriorates and reflective cracks appear
Solution Approach 1:
The patent applies different functional components in specific layers and proportions: polymer modifiers concentrated in the asphalt binder for thermal stability, while waterproofing agents and proper aggregate interlock structures are optimized in the mixture design to provide localized waterproof protection that prevents water infiltration and reflective cracking
Solution Approach 2:
The patent introduces waterproofing additives (such as wax emulsions or polymer-based waterproofing agents) as intermediary substances that form protective films between the asphalt matrix and water, preventing water penetration while allowing the polymer-modified asphalt to maintain its thermal stability
3Duration of action of stationary object
If polymer modifiers are added to improve high-temperature performance, then durability is enhanced, but the mixture becomes prone to temperature fatigue
Solution Approach 1:
The patent selects polymer modifiers with appropriate glass transition temperatures and viscoelastic properties that allow the asphalt mixture to dynamically adapt to temperature changes, providing flexibility at low temperatures to prevent cracking while maintaining stability at high temperatures to resist softening and permanent deformation over time
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 mixture enhances thermal stability, wear resistance, and fracture resistance, delaying reflective cracking and improving the durability and longevity of the pavement by forming a network structure that prevents phase separation and delamination, while maintaining non-expanding and non-cracking properties even in extreme climates.
Implementation Method 1
improves heat resistance, chemical corrosion resistance, and water resistance through cross-linking reactions and structural reinforcement
Implementation Method 2
A micro-surfacing sealing coat mixture comprising cationic emulsified asphalt, ethylene-1-octene copolymer, organic silicone resin, filler, aggregate, ditertiarybutyl peroxide, water, and accelerators
Data Source
AI summary
Disclosed is a micro-surfacing sealing coat mixture, comprising the following raw materials in parts by weight: 10-20 parts of a cationic emulsified asphalt, 5-7 parts of an ethylene-1-octene copolymer, 3-6 parts of an organic silicone resin, 8-12 parts of a filler, 80-90 parts of an aggregate, 2-4 parts of a ditertiarybutyl peroxide, 20-30 parts of water, and 0.5-2 parts of an accelerator. The method for preparing the micro-surfacing sealing coat mixture comprises: weighing raw materials other than the filler, aggregate and water, adding to a high-speed shear emulsifier and mixing at a temperature of 170-175° C. for 20-35 min, then continuously shearing at 3000-3500 r/min for 60 min to obtain a modified emulsified asphalt; cooling the modified emulsified asphalt to 20-30° C., adding the filler, aggregate and water thereto, and adding the resulting mixture to a mixer to mix evenly to obtain the micro-surfacing sealing coat mixture.