Micro Slurry

One of the most versatile tools in the road maintenance arsenal, Micro Surfacing is a polymer-modified cold-mix paving system that can remedy a broad range of problems on today’s streets, highways, and airfields.

Like its parent product, Slurry Seal, Micro Slurry Slurry Surfacing begins as a mixture of dense-graded aggregate, asphalt emulsion, water, and mineral fillers. While conventional Slurry Seal is used around the world as an economical treatment for sealing and extending the service life of both urban and rural roads, Micro Slurry Slurry Surfacing has added capabilities, thanks to the use of high-quality, carefully monitored materials, including advanced polymers and other modern additives.

A History of Expanding Service


Micro Slurry Surfacing was pioneered in Germany in the late 1960s and early 1970s. German scientists began experimenting with conventional slurry to find a way to use it in thicker applications which could be applied in narrow courses for wheel ruts, and not destroy the expensive road striping lines on the autobahns.

When the scientists used highly selected aggregates and bitumen, and then incorporated special polymers and emulsifiers that allowed the product to remain stable even when applied in multi-stone thicknesses, the result was Micro Slurry Surfacing.

Introduced in the United States in 1980, Micro Slurry Surfacing now is recognized not only as the most cost-effective way to treat the surface wheel-rutting problem, but also a variety of other road surface problems. Micro Slurry Surfacing is now used throughout Europe, the United States, and Australia and is making inroads into many other areas.

How is Micro Slurry Surfacing Made and Applied

Micro Slurry Surfacing is made and applied to existing pavements by a specialist machine, which carries all components, mixes them on site, and spreads the mixture onto the road surface. Materials are continuously and accurately measured, and then thoroughly combined in the Micro Slurry surfacing machine’s mixer. As the machine moves forward, the mixture is continuously fed into a full-width “surfacing” box which spreads the width of a traffic lane in a single pass. Or specially engineered “rut” boxes, designed to deliver the largest aggregate particles into the deepest part of the rut to give maximum stability in the wheel path, may be used. Edges of Micro Slurry Surfacing are automatically feathered.

The new surface is initially a dark brown color and changes to the finished black surface as the water is chemically ejected and the surface cures, permitting traffic within one hour in most cases.

Continuous-load pavers utilize support units which bring the materials to the job site and load the machine while it is working, thus maximizing production and minimizing transverse joints.                

A Proven Problem Solver 

Using various design mixes, techniques, and equipment, Micro Slurry Surfacing can be used successfully in these situations:

Using various design mixes, techniques, and equipment, Micro Slurry Surfacing can be used successfully in these situations:

 In quick-traffic applications as thin as 3/8 inch (9.5mm), Micro Slurry Surfacing can increase skid resistance, color contrast, surface restoration, and service life to high-speed roadways (interstates and autobahns). Such projects are often   reopened to traffic within an hour.

Modern, continuous-load pavers can lay 500 tons of Micro Slurry Surfacing per day, with no long traffic delays. This equates to an average 6.6 lane miles (10.6 lane kilometers) per day for surfacing applications.

On airfields, dense-graded Micro Slurry Surfacing produces a skid-resistant surface without loose rock that damages aircraft engines.

As a thin, restorative surface source on urban arterials and heavy traffic intersections, Micro Slurry Surfacing does not alter drainage; there is no loss of curb reveal.

Micro Slurry Surfacing is applied to problem sections of roads or runways to eliminate hydroplaning problems that occur during periods of rain. The Micro Slurry Surfacing restores the proper surface profile and makes the area safe to use.

Because Micro Slurry Surfacing can be effectively applied to most surfaces at 3/8 inches (9.5mm) or less, more area per ton of mix is covered, resulting in cost-effective surfacing.

Micro Slurry Surfacing creates a new, stable surface that is resistant to rutting and shoving in summer and to cracking in winter.

Applied to both asphalt and Portland cement concrete surfaces (usually preceded by a tack coat on concrete), Micro Slurry Surfacing is often used to restore a skid-resistant surface to slick bridge decking with minimum added dead weight.

Used as a scratch (leveling) course, to be followed by a surface course, Micro Slurry Surfacing can provide transverse surface leveling.

Because of its quick-traffic properties, Micro Slurry Surfacing can be applied in a broad range of temperature and weather conditions, effectively lengthening the paving season. It is particularly suitable for night applications on heavy-traffic streets, highways, and airfields.

Applied at ambient temperatures, Micro Slurry Surfacing has low energy requirements. And it is environmentally safe, emitting no-pollutants.

Micro Slurry Surfacing life expectancy usually exceeds seven years.

Capable of filling wheel ruts up to 1-1/2 inches (38mm) deep when the pavement has stabilized and is not subject to plastic deformation, Polymer Modified Quick Set Slurry Slurry Surfacing has the unique ability to solve this problem without milling. 


A Product of Quality

Successful Micro Slurry Surfacing incorporates carefully selected materials, scientific mix designs, advanced technical specifications, and problem field practices. Micro Slurry Surfacing begins with the selection of high-quality materials – asphalt, aggregate, emulsifiers, water, and additives – which must pass special laboratory tests, both individual and when combined, as a Micro Slurry Surfacing system. The International Slurry Surfacing Association’s (ISSA) broad range of specialized mix design tests help to insure that the mixture has these Micro Slurry Surfacing characteristics: After initial traffic consolidation, does not further compact (i.e. resists compaction) throughout the entire design tolerance range of bitumen content and variable thicknesses to be encountered, and  maintains good macro-texture (high wet coefficient of friction) in variable thick sections throughout the service life of the Micro Slurry Surfacing.


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