Road Resurfacing Techniques In Myanmar, Asia and Africa
During the 1930’s a new technique for maintaining road surfaces was developed. It consisted of a coating of very fine aggregate, asphalt emulsion and water.
This was the beginning of slurry surfacing. In early attempts, a concrete truck was used for mixing the materials and a truck or tractor used for spreading, creating unpredictable results.
Experimentation continued to refine the process with a breakthrough in the 1960’s as improved emulsifiers, set-control additives, and continuous flow machines were developed. This created an increased interest for using slurry for a wide variety of applications.
Road contractors and companies such as K31 Road Engineering are using advanced techniques such as this one and other cold asphalt mixes to develop more efficient roads in Myanmar, Asia and Africa.
The principle materials in a slurry surfacing are crushed aggregate, asphalt emulsion, water and special purpose additives such as mineral fillers and liquid or dry set control additives.
These are mixed together according to a laboratory’s mix design formula.
Advanced and specialized slurries may include polymers, fibers, or other materials. Each change or added material is designed to enhance a feature of the slurry for a particular end need such as rut filling or crack resistance.
Slurry surfacing is mixed in specially designed equipment, either truck mounted or selfpropelled. This equipment carries a quantity of unmixed materials which are blended together in a continuous flow pugmill.
Mixing and spreading are accomplished in one continuous operation with the new pavement surface normally re-opened to traffic within a few hours or less. Technologically advanced machinery insures a high degree of quality control and consistency in the mix.
Slurry surfacing qualities make it a good choice for pavement resurfacing when used on deteriorated roadways that are still structurally sound.
The slurry mix fills surface voids, small or fine cracks and minor depressions sealing the pavement against the infiltration of moisture. It used to provide an anti-skid surface to pavement with poor skid resistance.
Resurfacing asphalt shoulders of highways with a slurry surfacing application eliminates build-up of the pavement thickness. It also is used for rut filling and provides a surface that is uniform and smooth in appearance.
TYPES OF SLURRY SURFACING
The generic term slurry surfacing or slurry is used throughout this manual to reference Slurry Seal and Micro-Surfacing. VDOT currently distinguishes the two categories as follows:
Slurry Seal – A mixture of aggregate, emulsified asphalt, water, and additives properly proportioned, mixed and spread over a properly prepared surface. Slurry seal is applied in a single layer. It is generally used on low traffic primary and secondary roads.
Micro-Surfacing (Latex-modified Emulsion Treatment) – A mixture of cationic polymer modified asphalt emulsion, crushed aggregate, water and other additives, properly proportioned and spread over a prepared surface.
The special purpose polymers and additives used in micro-surfacing allow higher than normal rates of application and multi-layer applications for projects such as rut filling, higher traffic primary roads and highway resurfacing.
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