Transcript Dust Control with Dustac

DUSTAC APPLICATION INSTRUCTIONS
A step-by-step look at Surface Application - Procedures and Rates for
Haul and Access Roads
•
•
•
•
•
•
•
The Use of Polymers
The use of polymer based dust suppression is
recognised as the most effective form of dust control
A polymer is a large molecule composed of repeating
structural units
Although the term polymer is sometimes taken to refer to
plastics, it actually encompasses a large class of natural
and synthetic materials
Both synthetic and natural polymers are used in road
stabilisation
This applies to haul roads and other trafficable surfaces.
The benefits of these type of products include reduced
water application more stable road surfaces and a long
term sustainable management program.
Dustac is a natural polymer
Pre Treatment Considerations






The road substrate should consist of a well graded aggregate.
The road should be graded, profiled and compacted to accepted
engineering standards prior to dust suppression or stabilization
operations
Calculate the road surface area m2 and apply Dustac solution in
500 meter or 1000 meter sections.
The area treated at any one time is dependent on weather
conditions and equipment availability.
Insure the surface is wet. If necessary pre-water with at least 1
Litre per m2
Accurately determine the water-cart distribution rate, area
covered, speed, gear and engine revs when wetting out the area.
Application Guidelines
 The recommended rate of application for Dustac is between 400 and
800 mL per m2 depending on road base and traffic usage.
 Dustac should be applied in multiple applications at the rate of 25mL
per m2
 The rate of application of Dustac solution must be at least 1 litre per
meter squared – effectively a 2.5% solution
 Dustac should be applied continuously in 4 to 8 applications per day.
 Should the surface dry out water should be applied to match up the
moisture horizons.
 Once the desired dose is applied the surface should only be watered
as and when required to settle dust emissions
 This will be a lot less than before the application of Dustac.
 It is recommended that the standard dose of 25ml/m2 be applied
weekly as a ongoing maintenance dose
 This may be reduced to fortnightly once sufficient solids have been
incorporated into the top 25mm to 50mm of the road profile
 Although a continuous watering program is required, as rule of
thumb a Dustac treated road is likely to require 70% less water than a
road maintained solely with raw water
 Any water applied to the road surface will serve to rejuvenate the
Dustac and continually reseal the road
 The timing and frequency of these applications will be determined by
the quality of the road base, traffic frequency and type and climatic
conditions
 The volume at which the Dustac solution should be applied is 1L/m2
 This means 250 litres of Dustac should be added to 10,000 litres of
water – effectively a 2.5% solution