Stone mastic asphalt details

Stone mastic asphalt

Stone-matrix asphalt

SMA

Stone mastic asphalt (SMA) is a kind of asphalt mixture composed of asphalt, fiber stabilizer, mineral powder and a small amount of fine aggregate filled with intermittently graded coarse aggregate skeleton gaps. It has the composition characteristics of high content of coarse aggregate, high content of mineral powder, large amount of asphalt, and low content of intermediate particle size. The high content of coarse aggregate in the mixture is in direct contact between the particle surface and the surface, and the framework constituted by interlocking directly bears the load. This framework is less sensitive to temperature. The higher content of mineral powder and asphalt form a gelatinous substance with high cohesion-mastic, which improves the overall mechanical properties of the mixture. The effects of these two aspects make the mixture have sufficient vertical and lateral constraints, and under the action of the vehicle load, no or only slight permanent deformation is produced.

Technical Parameters
Appearance: black paste
Volatile matter: 5+/-25%
Oxygen Index: 30% (OI) min
Adhesion: 20℃ 1.5kg/cm2
Specific gravity: 1600～1700kg/m3
Flame retardancy: B2 level. (Leave the fire source for 1 second to self-extinguish.)
Heat resistance: Under 95℃, 45℃ slant for 4 hours, the temperature rises to 120℃, 45℃ slant for 1 hour without flowing and bubbling.
Frost resistance: -60℃ - +95℃ each hanging for 2 hours without cracking or detachment.
Operating temperature: --60℃ - +95℃ Special requirements can be customized
Water absorption: Soak at room temperature for 24 hours, and the water absorption is not more than 1% of the weight of the sample.
Construction thickness: 6mm
Drying time: 30 minutes of finger contact, 60 hours of total drying.
The amount of construction is 1.7kg per square meter for each millimeter of thickness, and this is superimposed.
Packing specification: 25Kg/iron drum

Instructions
Apply flame-retardant asphalt mastic on foam glass or non-cryogenic parts. Polyurethane and other heat-insulating materials, with a coating of 3mm, and a layer of waterproof glass cloth or plastic window screens in the middle. After the mastic is slightly dry, apply the mastic for a second time. After drying, the total thickness is about 5mm-6mm.
The coating is uniform, smooth and flat, and the surface is free of blisters.

Uses
Pavement of heavy traffic roads, airport runways, high-grade highways, and steel bridge pavement surfaces; moisture-proof building construction, etc.