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Subcontractor
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  • 03 9285 2257
  • info@roadcare.com.my

Mirco-Surfacing

Micro-surfacing is a modified version of slurry seal. It is a mixture of polymer modified asphalt emulsion, mineral aggregate, mineral filler (Portland cement), water, and additive that are properly proportioned, mixed and spread on a paved surface in accordance with specifications.

Micro-surfacing is used to restore or to preserve pavement surface. This surfacing mixture is designed to correct rutting (minor), improve skid resistance, seal surface cracks, protect pavement surfacing against hardening and improve surface texture.

Methodology and process involved in micro-surfacing procedure

  • The area to be surfaced with micro-surfacing shall be thoroughly cleaned of vegetation, loose material, silt spots and other objectionable material.
  • Water used in pre-wetting the surface shall be applied by the mixing machine immediately ahead of the spreader box at a rate to dampen the surface without any free flowing water allowed.
  • Manholes and other service entrance shall be protected from the micro-surfacing by a suitable method.
The material shall be mixed by a self–propelled micro-surfacing mixing machine. The machine shall have sufficient storage capacity for the aggregates, emulsified bitumen, mineral filler, additive and water to maintain an adequate supply to the proportioning controls.
Spreading of the mixture shall be undertaken in two layers, with an initial regulating layer followed by a uniform wearing course carpet. Total thickness for both layers shall between 10 – 12 mm. The spreading rate using the 0 – 8 mm aggregate gradation shall be between 18 – 25 kg/m².
  • Aggregate Gradation test that is grading of samples of the aggregates before mixing is conducted by frequency of 2 samples/machine load.
  • Binder Content is between 5.5 – 8.0% while mineral filler is between 0 – 2.
  • The skid resistance value of the completed material on carriageway shall have a minimum average value of 46 (corrected to 35°C as measured by the SRT pendulum device or equivalent for a number of tests to be agreed upon).
  • The finished micro–surfacing shall be of uniform surface texture and appearance throughout the work and shall be free from holes, streaks and surface irregularities.
  • The process shall be such that the laid material may be opened to traffic within typically sixty (60) minutes.