Stone Mastic Asphalt / Stone Matrix Asphalt (SMA)

Product Description:

Stone Mastic Asphalt (SMA) is a high-performance, gap-graded hot mix asphalt designed primarily as a durable wearing course. Characterized by a high coarse aggregate content forming a stone skeleton, and a rich mastic binder (bitumen, filler, and stabilizing additives like cellulose fibres), SMA offers exceptional resistance to rutting, wear, and fatigue, making it ideal for heavily trafficked roads in Malaysia. Complies with JKR/MS specifications.

Key Features:

• Mix Type: Gap-graded Hot Mix Asphalt with stone-on-stone contact.
• Layer Type: Wearing Course.
• Aggregate Structure: High coarse aggregate content (stone skeleton).
• Binder Type: Rich Mastic (Bitumen, Filler, Stabilizing Additives - often Polymer Modified Bitumen is used).
• Properties: Excellent rut resistance, high durability, good skid resistance, potentially lower noise, long service life.
• Compliance: Manufactured to meet JKR/SPJ/xxxx specifications for SMA.

Ideal for:

• Wearing course for highways, expressways, and roads with very heavy traffic volumes.
• Airfield pavements.
• Areas requiring maximum durability and resistance to permanent deformation (rutting).
• Tunnels and bridge decks (can offer spray/noise reduction).

Benefits:

• Superior Rut Resistance: Stone skeleton structure effectively resists deformation under heavy loads.
• Exceptional Durability: Withstands heavy traffic and environmental stresses for a longer lifespan.
• Enhanced Safety: Maintains surface texture and skid resistance over time.
• Reduced Life-Cycle Cost: Lower maintenance needs often offset higher initial cost.

Order our Stone Mastic Asphalt (SMA) for the most demanding wearing course applications!

Important Notes:

• Requires experienced design, production, and paving crews.
• Often uses Polymer Modified Bitumen (PMB) for optimal performance.
• Pricing is higher than standard asphalt mixes; typically charged per tonne.
• Delivered hot via insulated tipper trucks. Must be laid and compacted correctly.