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Dust Laying using Bitumen Emulsions

We already discussed about the what is the  dust laying , types of bitumen emulsions used, how to diluted and the application rates etc in the previous post. It is recommended to get complete idea go over here. And we are going to discuss here, what are operations of dust laying and special conditions, Life of the road that can expect after dust laying using bitumen emulsions and the various other techniques of dust laying by soil stabilizing techniques.

Operations of Dust Laying

It is preferable to shape, if necessary, and lightly sweep the surface to remove excessive dust and loose material. A preliminary dampening may assist in obtaining a uniform distribution. Excessive dust will reduce effectiveness and require more applications. Spraying is generally carried out with a bitumen sprayer. Diluted anionic emulsions may be applied with a standard water cart, preferably one with a pressure spray bar. Unbroken anionic emulsions can generally be completely removed by flushing with clean water to leave little, if any, bituminous residues.

Cationic emulsions should only be used in a conventional bitumen sprayer, as they leave a coating of bitumen on any surface, including metal, with which they come into contact.

Bituminous residues can be difficult to remove from equipment that is not designed for  spraying of bituminous  materials. Traffic should be kept off the surface until the emulsion is fully broken and the surface is dry. This is generally a minimum of 2 to 3 hours.

Life Expectancy

The initial emulsion dust laying treatment is usually followed up with a second application after 2 to 3 days. A further treatment may be applied after 3 to 4 weeks.

Effective service life can vary from several weeks to six months or more, depending on: the number of applications, weather,? traffic conditions, and nature of pavement material.

Service life can be extended by repeated applications. The time interval between subsequent applications generally increases

Dust Laying Using Soil Stabilization Techniques

Greater effectiveness of bitumen emulsion as a dust laying procedure for unsealed granular pavements may be achieved using stabilization techniques. Again, slow setting grades of emulsion (ASS or CSS) are used, but without dilution. Emulsion is applied by spray bar to a scarified surface and then mixed in by a stabilizing machine or grader, prior to compaction of the surface layer.

Typical application rates vary from 1% to 3% of residual binder by mass of the soil being treated. Lower application rates are used with well-graded granular materials.

Higher rates are required for sandy materials. Stabilization using bitumen emulsion is not suitable for fine-grained soils and materials of high plasticity. Efficiency of distribution of the emulsion through the soil is influenced by moisture content. A moist soil facilitates mixing and even distribution. Dry soil causes premature breaking of the emulsion and poor distribution. Excessive moisture makes the soil unstable and prevents proper compaction.

You have sound knowledge about  Dust Laying using bitumen emulsions  and you have an another ideas, comments, usage of various techniques by your experience.Please leave a comment what all about it.

priming Road Construction

Dust Laying Using Bitumen Emulsions

We already discussed concerning the dust laying under bitumen emulsions. But, i figured to go over at length here “how are we able to apply” that Dust laying can be utilized on unsealed granular pavements to minimize dust nuisance, in addition to decrease maintenance costs and lack of  pavement material.

The work tip describes using  bitumen emulsion.   Dust  laying using bitumen emulsion is usually only applicable to low  traffic roads  (under about 100 v/l/d), hard standing areas, haul roads and temporary pavements on construction sites.

Bitumen Emulsions

Types Used for Dust Laying

The best option emulsion grade for dust laying is usually anionic slow setting (ASS) although cationic slow setting (CSS) could also be used.


The emulsion is diluted with water just before use.  Dilution rates change from 4:1 water:emulsion to 12:1 water:emulsion, based on surface condition and application rate. A wetting agent or surfactant might be put into assist dilution and surface penetration.  The wetting agent should be suitable for the kind of  emulsion used.  Advice on compatible wetting agents and recommended dosage rates is obtainable from bitumen emulsion suppliers.

Compatibility from the water should be checked before diluting emulsion. When diluting emulsions, it is important to add water towards the emulsion, not emulsion to water to prevent premature breaking of emulsion. Only sufficient diluted emulsion for immediate use ought to be produced previously, as stored diluted emulsions are usually unstable.

Application Rates

An average application rate for diluted emulsion is all about 1.0 L/m2 of total liquid. If surface run-off occurs, the speed of application ought to be reduced. Lower application rates and better concentrations of emulsion are utilized on  hard surfaces . Higher application rates and much more diluted mixtures are utilized on softer and much more  permeable surfaces .

I am expecting write some more tips on dust laying  by using   bitumen emulsions  are in next post. You can Visit here.