Cold patch asphalt Formation of potholes
Water damage: Rainwater seeps into the road base and forms "empty" or "frost heave", causing the asphalt layer to break.
Traffic load fatigue: Heavy vehicles rolling over causes fatigue cracking of the asphalt mixture, which then peels off and turns into potholes.
Construction defects: Insufficient compaction, loose joints, and improper asphalt temperature control can lead to local instability.
Material aging: Ultraviolet rays and temperature difference cycles make asphalt aging and brittle, and its ability to resist deformation decreases.
Overview of common repair methods
Hot-mix asphalt mixture repair; suitable for structural, medium and large potholes or high-grade highways
Advantages: high structural integrity and long life
Disadvantages: high equipment dependence, high cost, road closure construction
Cold patch asphalt mixture repair; suitable for small and medium potholes, temporary quick repair, cold areas
Advantages: no heating required, can be operated on rainy days, easy to operate
Disadvantages: slightly weak adhesion and relatively short service life
Spraying quick repair technology (spraying repair vehicle); suitable for rapid repair of large-scale diseases
Advantages: high efficiency, automation, no need for manual compaction
Disadvantages: expensive equipment, high requirements for base density
Hot regeneration repair; suitable for areas with thick asphalt layers, dense potholes, or old road renovation
Advantages: environmental protection, energy saving, material recycling
Disadvantages: complex process, high cost
Precautions for cold patching
The road surface must be dry and clean to ensure adhesion;
The thickness of each filler should not exceed 5cm, and it should be filled and compacted in layers when necessary;
The cold patch material must be stored in a sealed barrel to avoid expiration;
After cold patching, the dent must be checked and supplemented within 24 hours.
Typical case analysis
Case 1: Expressway pothole rapid repair project
800 potholes were quickly repaired using cold patch asphalt
Construction cycle shortened to 30% of the original
On average, each pothole took only 8 minutes to repair, saving road closure time
Case 2: Hot regeneration repair of potholes on urban trunk roads
Use infrared thermal regeneration technology to heat, mill, fill and compact old asphalt
Reduce new material consumption by 45%
The surface layer is well combined with the old material, and the service life is increased by 30%
