Highway preventive maintenance refers to taking a series of proactive measures to delay the deterioration of road performance, extend service life, and reduce the total life cycle cost before serious diseases or damages occur on the highway. The core of preventive maintenance is "early detection and early treatment", which maintains the good technical condition and service level of highways through scientific and reasonable maintenance methods. The types and technical parameters of preventive maintenance materials for highways mainly include the following:
1. Asphalt mixture
(1) Types: Hot Mix Asphalt (HMA), Warm Mix Asphalt (WMA), Cold Mix Asphalt (CMA)
(2) Technical parameters:
Asphalt content: 4-6%
Aggregate gradation: meets the requirements of the specifications
Void ratio: 3-5%
Stability: ≥ 8kN
Flow value: 2-4mm
2. Micro surface area
(1) Type: Polymer modified emulsified asphalt micro surface
(2) Technical parameters:
Emulsified asphalt content: 10-15%
Aggregate gradation: meets the requirements of the specifications
Thickness: 5-10mm
Initial setting time: ≤ 1 hour
Open traffic hours: ≤ 4 hours
3. Slurry sealing layer
(1) Type: Ordinary emulsified asphalt slurry seal, modified emulsified asphalt slurry seal
(2) Technical parameters:
Emulsified asphalt content: 8-12%
Aggregate gradation: meets the requirements of the specifications
Thickness: 3-6mm
Initial setting time: ≤ 2 hours
Open traffic hours: ≤ 6 hours
4. Mist sealing layer
(1) Type: Emulsified Asphalt Mist Seal Layer, Modified Emulsified Asphalt Mist Seal Layer
(2) Technical parameters:
Emulsified asphalt content: 50-70%
Spraying amount: 0.3-0.6kg/m2
Initial setting time: ≤ 1 hour
Open traffic hours: ≤ 2 hours
5. Crack repair materials
(1) Type: Hot poured seam adhesive, Cold poured seam adhesive
(2) Technical parameters:
Softening point: ≥ 80℃
Penetration: 40-80 (0.1mm)
Elastic recovery rate: ≥ 60%
Adhesive strength: ≥ 0.5MPa
6. Recycled pavement materials
(1) Type: Hot Regeneration, Cold Regeneration
(2) Technical parameters:
Regeneration agent content: 2-4%
Aggregate gradation: meets the requirements of the specifications
Void ratio: 3-5%
Stability: ≥ 8kN
Flow value: 2-4mm
7. Anti slip surface layer
(1) Type: High friction coefficient anti-skid surface layer
(2) Technical parameters:
Friction coefficient: ≥ zero point five five
Thickness: 2-4mm
Aggregate gradation: meets the requirements of the specifications
Adhesive strength: ≥ 0.5MPa
8. Waterproof materials
(1) Type: Waterproof membrane, waterproof coating
(2) Technical parameters:
Tensile strength: ≥ 10MPa
Elongation at break: ≥ 200%
Adhesive strength: ≥ 0.5MPa
Heat resistance: ≥ 80℃
9. Geosynthetic materials
(1) Type: Geotextile, Geogrid, Geomembrane
(2) Technical parameters:
Tensile strength: ≥ 50kN/m
Fracture elongation: ≤ 20%
Permeability coefficient: ≤ 1 × 10 ⁻¹¹ cm/s
Thickness: ≥ 0.5mm
10. Other materials
(1) Type: Anti slip coating, marking coating
(2) Technical parameters:
Friction coefficient: ≥ zero point six five
Thickness: 0.5-1.5mm
Adhesive strength: ≥ 0.5MPa
Weather resistance: ≥ 5 years
The selection of these materials and technical parameters should be comprehensively considered based on specific engineering requirements, environmental conditions, traffic volume, and other factors.
