Semi flexible grouted macadam

• Grouted Macadam consists of a single sized porous bituminous layer whose voids can be filled with the selected fluid grout or cementitious slurry.
• The porous bituminous skeleton is designed to achieve a high void content while maintaining a thick bitumen coating on the aggregate particles (Zoorob et al., 2002).
• Grouted macadam gives advantages of both flexible and rigid pavements namely,

  •  Flexibility and absence of joints by use of bitumen,

  •  High static bearing capacity and wear resistance (as for concrete) by use of cementitious grout.

Micro-surfacing

• Micro-surfacing is a fast and economical surface treatment technique used for preventive maintenance of bituminous and cement concrete pavements.
• Polymer modified emulsion, cold blended with fine graded aggregates, mineral fillers, additives and water, gives the high performing micro-surfacing mixture.
• Micro-surfacing is generally used to restore the top wearing surface of pavement as a maintenance measure, thereby extending the pavement life.
• Its thickness may be varied to achieve desired objective(s) such as rut-filling, skid resistance improvement, surface sealing, surface texturing, noise reduction, repairing abraded wheel path channels etc (ODOT 2004; Miller 2004).