USTBOND - Adcon · A CLOSER LOOK AT UNSEALED GRAVEL / EARTH SURFACE ROADS IN THE CONTEXT OF ADCO...
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PRODUCT DESCRIPTION AND DEVELOPMENT ADCO Dustbond 790 is a liquid compound, based on high sugar (~20%) lignin (lignosulphonate) chemistry. It is supplied as a concentrate with various dilution derivatives being prepared by the user on site before application. The product is manufactured in Namibia. Lignin is described as a natural Polymer present as one of the major constituents of wood (comprising 20 – 30% of its dry weight). It is separated from the other major wood constituent, cellulose, by the sulphite wood pulping process. ADCO Dustbond 790 is supplied as a dark brown liquid with particular suitability in dust suppression and road stabilization applications, due to its environmentally friendly and non-toxic health consideration properties. ADCO Dustbond 790, also classified as a natural material, is biodegradable and well accepted due to its origin stemming from a renewable resource. The application of lignin as a natural binder material in road construction and maintenance is recorded as early as 1916 in Sweden. Extensive research and field study data is available and was used as guideline in formulating ADCO Dustbond 790. ADCO Dustbond 790 finds an extensive range of applications, including the following : Unsurfaced gravel / earth surface roads; Unsurfaced gravel / earth surface runways; Haul roads in mining industries, including underground haul roads; Erosion control; Construction sites; Quarries; Mine dumps; Temporary bypasses during road construction or maintenance; Parking areas; Road shoulders; Livestock concentration areas such as feedlots and auction pens; Dust pollution sensitive areas; Sand dune stabilization. The product does not require special skills, nor specialized / costly application equipment. It is effective to a wide range of materials constituting the substrate and can be optimized for the particular requirement by conducting site trials. A CLOSER LOOK AT UNSEALED GRAVEL / EARTH SURFACE ROADS IN THE CONTEXT OF ADCO DUSTBOND 790 A large proportion of roads around the world (specifically in Africa) are not bituminous surfaced or paved. Design parameters such as choice of constituent materials used during construction, sufficient camber (±4%), adequate drainage of surface water, non-standard repair methods / materials employed to rectify defects (potholes, etc) as well as poor and / or non-routine maintenance of such traditional unsealed roads can lead to situations as described below : Dusting, the loss of fine dust and gravel materials off road surfaces. Dusting renders itself undesirable from a human comfort, safety, health, environmental and aesthetic perspective as well as costly in terms of the thousands of tons of material lost that have to be replaced at considerable expense. The loss of fine dust from the road surface accelerates the deterioration of the surface, again pointing to the cost implications to reinstate riding quality, year-round passability and road-user friendliness and acceptance. Erosion of erodible materials out of the road surface. established 1994 a d d c c o o n n a cc ADCO DUSTBOND 790 Chemical binding agent for dust control and stabilization technical data sheet technical data sheet technical data sheet The information provided in this technical product data summary is to the best of our knowledge correct. Please ensure produ ct suitability for the specific application – technical back-up and method statements available; no warranty / guarantee expressed or implied on installation of product. Page 1 of 4 Head Office : Nr 7 Eider Street, Lafrenz, P O Box 80490, Windhoek, Namibia Tel : +(264)61–215340 Fax : +(264)61–238429 E-mail : [email protected] Walvis Bay Branch : Unit 14, 10th Street, Factory Park, P O Box 4587, Walvis Bay, Namibia Tel : +(264)64–221343 Fax : +(264)64–221344 E-mail : [email protected] www.adcon-namibia.com www.adcon-namibia.com A typical dusting road in Namibia. Example of an eroded gravel road.
Transcript of USTBOND - Adcon · A CLOSER LOOK AT UNSEALED GRAVEL / EARTH SURFACE ROADS IN THE CONTEXT OF ADCO...
PRODUCT DESCRIPTION AND DEVELOPMENT ADCO Dustbond 790 is a liquid compound, based on high sugar (~20%) lignin (lignosulphonate) chemistry. It is supplied as a concentrate with various dilution derivatives being prepared by the user on site before application. The product is manufactured in Namibia.
Lignin is described as a natural Polymer present as one of the major constituents of wood (comprising 20 – 30% of its dry weight). It is separated from the other major wood constituent, cellulose, by the sulphite wood pulping process. ADCO Dustbond 790 is supplied as a dark brown liquid with particular suitability in dust suppression and road stabilization applications, due to its environmentally friendly and non-toxic health consideration properties. ADCO Dustbond 790, also classified as a natural material, is biodegradable and well accepted due to its origin stemming from a renewable resource.
The application of lignin as a natural binder material in road construction and maintenance is recorded as early as 1916 in Sweden. Extensive research and field study data is available and was used as guideline in formulating ADCO Dustbond 790.
ADCO Dustbond 790 finds an extensive range of applications, including the following : Unsurfaced gravel / earth surface roads; Unsurfaced gravel / earth surface runways; Haul roads in mining industries, including underground haul roads; Erosion control; Construction sites; Quarries; Mine dumps; Temporary bypasses during road construction or maintenance; Parking areas; Road shoulders; Livestock concentration areas such as feedlots and auction pens; Dust pollution sensitive areas; Sand dune stabilization.
The product does not require special skills, nor specialized / costly application equipment. It is effective to a wide range of materials constituting the substrate and can be optimized for the particular requirement by conducting site trials.
A CLOSER LOOK AT UNSEALED GRAVEL / EARTH SURFACE ROADS IN THE CONTEXT OF ADCO DUSTBOND 790 A large proportion of roads around the world (specifically in Africa) are not bituminous surfaced or paved. Design parameters such as choice of constituent materials used during construction, sufficient camber (±4%), adequate drainage of surface water, non-standard repair methods / materials employed to rectify defects (potholes, etc) as well as poor and / or non-routine maintenance of such traditional unsealed roads can lead to situations as described below :
Dusting, the loss of fine dust and gravel materials off road surfaces. Dusting renders itself undesirable from a human comfort, safety, health, environmental and aesthetic perspective as well as costly in terms of the thousands of tons of material lost that have to be replaced at considerable expense. The loss of fine dust from the road surface accelerates the deterioration of the surface, again pointing to the cost implications to reinstate riding quality, year-round passability and road-user friendliness and acceptance.
Erosion of erodible materials out of the road surface.
established 1994
addccoonn a cc
ADCO DUSTBOND 790 Chemical binding agent for dust
control and stabilization
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The information provided in this technical product data summary is to the best of our knowledge correct. Please ensure produ ct suitability for the specific application – technical back-up and method statements available; no warranty / guarantee expressed or implied on installation of product.
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Head Office : Nr 7 Eider Street, Lafrenz, P O Box 80490, Windhoek, Namibia Tel : +(264)61–215340 Fax : +(264)61–238429 E-mail : [email protected]
Walvis Bay Branch : Unit 14, 10th Street, Factory Park, P O Box 4587, Walvis Bay, Namibia Tel : +(264)64–221343 Fax : +(264)64–221344 E-mail : [email protected]
www.adcon-n
amibia.com
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A typical dusting road in Namibia. Example of an eroded gravel road.
A CLOSER LOOK AT UNSEALED GRAVEL / EARTH SURFACE ROADS IN THE CONTEXT OF ADCO DUSTBOND 790
A general observation on ADCO Dustbond 790 treated roads is that the fines content in the bound road surface layer is increased with the continued crushing of larger particles into fine material by traffic road usage; whereas for untreated roads such finer material would be lost in the form of dust. Depending on material characteristics, increased presence of such fines may lead to slipperiness and will require attention. Should such a poor quality material have been installed (probably due to remoteness of geological location) even more emphasis to penetration should be given during installation as well as rejuvenation of ADCO Dustbond 790.
INSTALLATION / APPLICATION OF ADCO DUSTBOND 790 IN UNSURFACED ROADS ADCO Dustbond 790 finds application both as dust palliative as well as stabilizer for subbase and base materials in road construction and maintenance. The use of the product in base and subbase for sealed road construction finds ever increasing demand.
As dust palliative, ADCO Dustbond 790, agglomerates fine particles effectively thereby preventing their loss off the road surface by becoming entrained in the wind turbulence generated by a moving vehicle. The product will extend the service life of a road constructed with poorer quality material (specifically in terms of particle size distribution and plasticity). In general, the application of ADCO Dustbond 790 to a well-constructed, well-drained road will result in the improved performance of the road and reduced cost. However, ADCO Dustbond 790 will not change an inherently bad road to a good road, i.e. the considerate incorporation of ADCO Dustbond 790 as constituent into an unsealed gravel road is the key to an economically favourable long-term solution.
Application methods of ADCO Dustbond 790 include the following :
If correctly used, ADCO Dustbond 790 can provide an economically justifiable alternative to traditional unsealed road maintenance practices (such as water-spraying and compaction) in the form of a bound, dust-free wearing course with extended service life and lowered maintenance cost.
established 1994
addccoonn a cc
ADCO DUSTBOND 790 Chemical binding agent for dust
control and stabilization
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The information provided in this technical product data summary is to the best of our knowledge correct. Please ensure produ ct suitability for the specific application – technical back-up and method statements available; no warranty / guarantee expressed or implied on installation of product.
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Head Office : Nr 7 Eider Street, Lafrenz, P O Box 80490, Windhoek, Namibia Tel : +(264)61–215340 Fax : +(264)61–238429 E-mail : [email protected]
Walvis Bay Branch : Unit 14, 10th Street, Factory Park, P O Box 4587, Walvis Bay, Namibia Tel : +(264)64–221343 Fax : +(264)64–221344 E-mail : [email protected]
www.adcon-n
amibia.com
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Ravelling, where non-uniform material forms
wind rows parallel to the wheel tracks.
Corrugation due to loss of particles from the road surface as a result of insufficient plasticity of the
material leading to poorly-bound particles.
Slipperiness during and after rainfall in situations where
the clay content of the road material is too high (followed by extreme dusting during dry periods).
INSTALLATION / APPLICATION OF ADCO DUSTBOND 790 IN UNSURFACED ROADS (cont’d…)
The existing road surface is ripped, a dilution of the product applied to the spread material, the latter mixed again, followed by re-compaction.
The product is mixed with water at appropriate dilution and applied as spray-on. The product is introduced into the compaction water and applied during road construction and / or regravelling. After ripping the existing road surface or spreading imported gravel, the product is applied at required dilution, the material
mixed again followed by compaction.
ADCO Dustbond 790 as binder in road maintenance is based on an initial installation followed by a rejuvenation process at different intervals. This process aims to, over time, incorporate
a specific dosage level of ADCO Dustbond 790 binder into the road surface layers. Before the product is incorporated into a section of road, defects such as erosion, corrugation, ravelling, potholes, rutting and incorrect drainage should be attended to.
Effectiveness of the product’s binding capacity relies on penetration into the layers of the road surface. Important thus is the availability of moisture in the substrate before ADCO Dustbond 790 is added. (Note that a water saturated substrate is undesirable and should be allowed to dry.)
Preparation work and drainage vary as a function of road material properties, road quality, ambient climatic conditions, as well as the type of traffic exposure in terms of vehicle loads, frequency and speed of travel.
A typical installation procedure followed for a 200 - 250 vehicle per day unsealed gravel road can be outlined as follows : Year 1 : Initial installation 500 – 700 g / m2 (ADCO Dustbond 790 solids) followed by spray-on rejuvenations of about 150 g / m2 dosages at one month, three months, six months, nine months and twelve months (total ~1.5 kg m2). Year 2 : 100 g / m2 every three months (total 400 g / m2). Year 3 : 100 g / m2 every four months (total 300 g / m2).
Thereafter : 100 g / m2 every six months.
established 1994
addccoonn a cc
ADCO DUSTBOND 790 Chemical binding agent for dust
control and stabilization
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The information provided in this technical product data summary is to the best of our knowledge correct. Please ensure produ ct suitability for the specific application – technical back-up and method statements available; no warranty / guarantee expressed or implied on installation of product.
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Head Office : Nr 7 Eider Street, Lafrenz, P O Box 80490, Windhoek, Namibia Tel : +(264)61–215340 Fax : +(264)61–238429 E-mail : [email protected]
Walvis Bay Branch : Unit 14, 10th Street, Factory Park, P O Box 4587, Walvis Bay, Namibia Tel : +(264)64–221343 Fax : +(264)64–221344 E-mail : [email protected]
www.adcon-n
amibia.com
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Waterspraying on gravel road. During application of the dark-coloured product.
Preparation work for ADCO Dustbond rejuvenation Rejuvenation process during road in progress whilst mine haul road in use. maintenance.
INSTALLATION / APPLICATION OF ADCO DUSTBOND 790 IN UNSURFACED ROADS (cont’d…) A typical installation procedure followed for an unsealed runway for example at a lodge / safari camp with five landing / take-off cycles per day :
Year 1 : Initial installation 600 g / m2 (ADCO Dustbond 790 solids) followed by spray-on rejuvenations of about 200 g / m2 dosage at one month. After that, 150 g / m2 at four months, eight months and twelve months.
Year 2 and thereafter : 100 g / m2 every six months.
When applying ADCO Dustbond 790 at elevated temperatures and low relative humidity ambient conditions, it is important to
consider sufficient moisture being present in the surface to facilitate penetration.
Treatment of road surfaces to carry heavy load traffic needs to be complemented by appropriate compaction means.
Incorrect camber of road design leading to poor drainage and ponding may promote leaching of ADCO Dustbond 790 out of the top
layer into deeper layers, slipperiness as well as accelerated formation of potholes. Should leaching to greater depths has taken place,
an intermediate rejuvenation application may become necessary. Hence, should water-spray form a part of future road maintenance
after treatment with ADCO Dustbond 790, exposure of the surface to excessive amounts of water needs to be avoided.
In summary, as the section of road over time is bound with the ADCO Dustbond 790, a denser matrix is formed resulting in greatly increased resistance to leaching, improved road user characteristics and extended service life at longer maintenance intervals and thus at reduced cost. Changes in frequencies and / or dosages of rejuvenation application may become necessary for :
Excessive migration of ADCO Dustbond 790 to greater depths (140 – 200 mm) with resulting decreased concentrations in
the top 20 mm.
Gravel displacement, specifically in the case of poorly graded materials.
Uncontrolled exposure to ponding water.
Incorrect maintenance.
A further application of ADCO Dustbond 790 is the modification of material and in localized defect repairs such as potholes or erosion channels. In such cases, the addition of water is substituted by the product effectively rendering an aggregate binder. It is useful to treat surrounding areas as well to achieve a gradual concentration gradient from repair area to existing road surface.
SAFETY
There is no health risk involved in handling ADCO Dustbond 790. The standard protective measures such as wearing gloves and
goggles are recommended.
Remember : Keep away from children, handle responsibly and consider the environment.
Toxicological information
LD50 : > 5 g / kg
Local effects : None
Skin irritant : According to the OECD Guidelines No 404, 1981, this product is not classified as a skin irritant.
Eye irritant : According to the OECD Guidelines No 405, 1981, this product is not classified as an eye irritant.
Ecological information Fish toxicity : According to the OECD method No 203, this product is not classified as fish toxic. Biodegradability : According to the OECD method No 302B, this product is classified as inherently biodegradable. Dilution : When diluting ADCO Dustbond 790 with water, ensure the discharge nozzle is below the liquid level to
avoid foaming.
PACKAGING ADCO Dustbond 790 is available in 200 litre drums, 1000 litre flowbins, or as bulk delivery. UPDATE May 2017. This supercedes all previous documentation.
established 1994
addccoonn a cc
ADCO DUSTBOND 790 Chemical binding agent for dust
control and stabilization
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The information provided in this technical product data summary is to the best of our knowledge correct. Please ensure produ ct suitability for the specific application – technical back-up and method statements available; no warranty / guarantee expressed or implied on installation of product.
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Head Office : Nr 7 Eider Street, Lafrenz, P O Box 80490, Windhoek, Namibia Tel : +(264)61–215340 Fax : +(264)61–238429 E-mail : [email protected]
Walvis Bay Branch : Unit 14, 10th Street, Factory Park, P O Box 4587, Walvis Bay, Namibia Tel : +(264)64–221343 Fax : +(264)64–221344 E-mail : [email protected]
www.adcon-n
amibia.com
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