Showing posts with label Asphalt Emulsions. Show all posts
Showing posts with label Asphalt Emulsions. Show all posts

February 17, 2017

Bitumen in Road Construction

Bitumen is used in road construction due to various properties and advantages it has over other pavement construction materials. Advantages of bitumen for road construction is discussed.

Why is Bitumen Used in Road Construction?

Bitumen gain certain unique properties that are inbuilt in it during its manufacture. The bitumen as a raw material in flexible road construction and bitumen as a mix (composing other materials i.e. aggregates/ pozzolans) serves certain advantages, that prompt to use bitumen widely in road construction.

Use of Bitumen in Flexible Road Construction

The reason behind the significant application of bitumen in flexible pavements are explained below:

1. Production of Bitumen is economical

Bitumen is a by-product of crude oil distillation process. Crude oil itself is a composition of hydrocarbons. The primary products that are available are the petrol, diesel, high octane fuels and gasoline.
When these fuels are refined from the crude oil, the bitumen is left behind. Further treatment of by-product, to make it free from impurities give pure bitumen.
As the primary product demand is of utmost importance to the society, the bitumen as a by product has survival for long. This by product is utilized as a new construction material, without going for any other new resource.

2. Physical and Rheological Properties of Bitumen bring Versatility

The physical and the chemical properties of Bitumen are found to be a function of load level, temperature and the duration of loading. It is a thermoplastic and viscoelastic material.
These dependencies make us to truly access the traffic on the road so that a bitumen mix properties can be varied based on the stress levels calculated. This versatility of bitumen results in a large variety of bitumen mix, based on the road application.

3. The Melting Point of Bitumen is low

It is highly appreciable about the fact that bitumen has a favorable melting point, that helps in both surface dressing and wearing resistance with ease.
The melting point of the bitumen should not be too high, that it can be melted easily during laying the pavement. At the same time, bitumen has a melting point, which would not let the already casted road pave to melt and deform under high temperatures.
In areas of high temperatures, along with this quality of bitumen, the aggregate composition helps to cover up the effect of large temperature.

4. Bitumen can undergo Recycling

As the melting point of bitumen is favorable, it can be melted back to its original state. This is called as asphalt recycling process.
The torn-up asphalt pieces are taken up to the recycling plant, instead of sending them to landfills. This recycled mix can be reused. If necessary, the old bitumen is mixed with new bitumen and new aggregates to make the mix live again.

5. Bitumen gain Adhesive Nature

As explained in the production of bitumen, it is free from hydrocarbon and hence not toxic. The by product is refined to maximum to get rid of organic materials and impurities.
The bitumen has a highly adhesive nature, which keeps the materials in the road mix bind together under strong bonds. These become stronger when the mix is set i.e. ready for vehicle movement.

6. Bitumen has Color Variety

The traditional bitumen is black in color. This is because the dense organic material within bitumen is black in color. Now, when certain pigments are added to bitumen, the color of our choice can be obtained. These are colored bitumen.
It is costly than the normal colored bitumen. The disadvantage of colored bitumen is that it requires more chemical additives and materials.

Requirements of Bitumen Mixes for Road Construction

An overall bitumen mix is used in the construction of flexible pavement to serve the following needs.
  • Structural Strength
  • Surface Drainage
  • Surface Friction

Structural Strength of Bituminous Pavements

The figure below shows a typical cross section of flexible pavement, that was developed in the USA. The structural bitumen layer composes of:
  • Bituminous surface or wearing course
  • Bituminous binder course
  • Bituminous base course
The primary purpose of these bitumen mixes is structural strength provision. This involves even load dispersion throughout the layers of the pavement. The loads involved are dynamic or static loads, which is transferred to the base subgrade through the aggregate course.
A granular base with a bituminous surface course is only provided for roads of low traffic. It is just sufficient and economical.
The rebounding effect of bitumen upper layers helps in having resistance against high dynamic effect due to the heavy traffic. Rebounding property is reflected by the stiffness and the flexibility characteristics of the bitumen top layers. When looking from bottom to top, the flexibility characteristics should increase.
Studies have shown that the above mentioned characteristics of aggregates are attained using densely graded bitumen mixes. This mix should make use of nominal maximum size aggregate (NMAS), that must decrease from the base course- binder course – surface course.
The nominal maximum size aggregate (NMAS) = One sieve larger than first sieve-to retain more than 10% of combined aggregate.
There is a higher amount of bitumen content in the wearing course, that make the layer more flexible. This would help in increasing the durability.

Surface Drainage of Bituminous Pavements

Subsurface drainage can be facilitated using granular sub base in the construction of flexible pavement. Permeable asphalt treated base (PATB) can be used to provided positive surface drainage in major highways. This would behave as a separate course for facilitating subsurface drainage.

Surface Friction of Bituminous Roads

It is essential for the pavement layer to provide enough skid resistance and friction, during vehicle passage, especially in wet condition. This would ensure the safety of the passengers. The macro and the micro surface texture of the asphalt mix contributes towards the surface friction.

The mix gradation i.e. open graded or dense graded will contribute to macro surface texture. The open graded mix have higher macro surface than dense graded. The water is squeezed out from the bottom of vehicle tire when the high macro surface texture is implemented.
The micro surface texture is contributed by the aggregate surface, that is exposed when the above bitumen layer is torn.

Advantages of Bituminous Road Construction Over Concrete Pavements

1. A smooth Ride Surface

It does not make use of any joints; Hence provide a smooth surface to ride. It also gives less sound emission when compared with concrete pavements. The wear and tear are less in the bituminous pavement, thus maintaining the smoothness.

2. Gradual Failure

The deformation and the failure in the bituminous pavement is a gradual process. The concrete pavement shows brittle failures.

3. Quick Repair

They have an option to be repaired to be quick. They don’t consume time in reverting the path for traffic; as they set fast.

4. Staged Construction

This helps in carrying out staged construction in a situation when problems of fund constraint or traffic estimation problems are faced.

5. Life Cost is Less

The initial cost and overall maintenance cost of bituminous pavement are less compared to concrete pavement.

6. Temperature Resistant

They act resistant against high temperature from melting and are not affected by de-icing materials.

Disadvantages of Bituminous Pavement

  1. Bituminous pavements are less durable
  2. Low tensile strength compared to concrete pavement
  3. Extreme weather and improper weather conditions tend to make bituminous pavement slick and soft.
  4. Bitumen with impurities can cause pollution to soil, hence ground water by their melting. These may have hydrocarbons in small amounts.
  5. Clogging of pores and drainage path during construction and service life
  6. More salting- to prevent snow during winter season
  7. Cost of construction high during extreme conditions of temperature

Source - enggfeed

September 26, 2012

Explosion at Asphalt Plant

A LARGE explosion rocked the industrial estate off Boundary Road at Narangba early this afternoon as flames engulfed a bitumen tanker at the Boral Asphalt plant.

A nearby tanker containing fuel, LPG and more bitumen was also in danger of catching alight before fire crews brought the blaze under control.
 Rowan Carnes was working at the mill across the road when he heard the explosion."It sounded like a tyre had popped on my forklift," he said.
"Next thing you know all the boys were pointing over this way and there's big smoke and flames coming out.
"It was quite large. Everyone in the whole mill, right across to the other side of the mill, could feel the concussion from it."
Karen Wintle said via facebook that she felt the impact at her work kilomtres away in Deception Bay.
There were 21 workers on-site when the explosion took place, including six in the immediate vicinity of the blaze, but none were injured.
The Boral workers were all evacuated along with more than 100 employees from neighbouring plants.
A Department of Community Services spokesperson confirmed the explosion took place at about 12.20pm.
Several police and ambulance vehicles as well as 25 fire-fighters attended in four fire trucks rushed to the scene.
Acting Inspector Jeff Barker, from Burpengary Command, said crews were able to see large volumes of smoke en-route and the tanker was well engulfed when they first arrived."There had actually been an explosion in the bitumen tank, which contained approximately 8000 litres of bitumen," he said.
"We were able to contain the fire in the tanker and therefore bring it under control."It's all been contained within the site. We've had environmental agencies here to control the runoff."Act Insp Barker said the workers "in close proximity" to the explosion were "very lucky" to escape.
"The explosion was quite substantial as far as I understand, with a fireball," he said.
"(There was) thick black smoke, we were lucky that the wind direction took it away from any neighbouring properties."
Superintendent David Tucker from Redcliffe Police District said it was still unclear what caused the explosion and Boral would be fully investigating the incident."Everything has the potential (to become very serious) but obviously the plant has acted appropriately under the circumstances and all the plans have been enacted beautifully."

August 13, 2012

Asphalt Event in Europe

The upcoming Asphaltica exhibition in the Italian city of Padova will be a major launch venue for new asphalt road technologies. The sixth edition of Asphaltica, the only European event dedicated to asphalt, bitumen and road infrastructure, will take place from 21 - 23 November 2012 at the PadovaFiere exhibition centre. This exhibition is an important meeting place for industry professionals wanting updates on the latest and most interesting technological and regulatory developments.

The show also gives industry professionals the chance to discuss foreign markets and future challenges. The event is aimed at engineers and professionals including those from contractors, public and private entities. The show also targets those involved in the management of road networks, as well as users of machinery, equipment, materials and technologies for the production of conglomerates. The Asphaltica 2010 event attracted 180 exhibitors and over 10,000 visitors and was organised jointly by PadovaFiere and the Italian Association of Asphalt Bitumen Roads (SITEB).

This event will feature a strong conference programme, as in the past, which is being organised by SITEB. Issues covered will be technological efficiency and sustainability, cost optimisation, environmental impact and safety of workers, road performance standards and their application. In addition, new for 2012 will be the Road Safety conference, which will cover all aspects from the road safety technology to the design of intelligent infrastructure.

Soruce - World Highways

August 2, 2012

Asphalt and Cancer- Is there a Link ?

Roofers and road construction workers who use hot asphalt are exposed to high levels of polycyclic aromatic hydrocarbons (PAHs). A University of Colorado Cancer Center study published this week in the British Medical Journal Open shows that roofers have higher PAH blood-levels after working a shift and that these high levels of PAHs are linked with increased rates of DNA damage, and potentially with higher cancer risk.

“We’ve known for some time that roofers and road workers have higher cancer rates than the general population, but we also know roofers have a higher rates of smoking, alcohol use and higher UV exposure than the general population. It’s been difficult to pinpoint the cause of higher cancer rates – is it due to higher PAHs or is it due to lifestyle and other risk factors?” says Berrin Serdar, MD, PhD, investigator at the CU Cancer Center and assistant professor of environmental and occupational health at the Colorado School of Public Health.

Her study, completed with colleagues at the University of Miami, studied 19 roofers from four work sites in Miami-Dade County. Participants’ urine samples, provided before and after a 6-hour shift, showed that after acute exposure to hot asphalt, PAH biomarkers were elevated. Overall, biomarkers of PAH exposure and oxidative DNA damage (8-OHdG) were highest among workers who didn’t use protective gloves and workers who also reported work related skin burns, pointing to the role of PAH absorption through skin.

“PAHs are a complex mixture of chemicals some of which are known human carcinogens. They are produced by incomplete combustion of organic materials and exist in tobacco smoke, engine exhaust, or can come from environmental sources like forest fires, but the highest exposure is among occupational groups, for example coke oven workers or workers who use hot asphalt,” Serdar says.

“We can’t say with certainty that exposure to hot asphalt causes roofers’ increased cancer rate,” Serdar says, “but that possibility is becoming increasingly likely. Hot asphalt leads to PAH exposure, leads to higher PAH biomarkers, leads to increased DNA damage – we hope to further explore the final link between DNA damage due to PAH exposure and higher cancer rates in this population.”

Serdar and colleagues at the CU Cancer Center have initiated a wider study of roofers in the Denver metropolitan area. This study will simultaneously investigate air, blood, and urine levels of PAHs and their link to DNA damage in samples collected over a workweek.
Source-  abcforums

June 15, 2012

Modular Evaporator Technology to Extract Bitumen

Aquatech Introduces SMARTMOD(TM) Modular Evaporator Technology for Oil Sands Market

Aquatech, a global leader in water purification technology for the industrial and infrastructure markets, will unveil its SMARTMOD(TM) modular evaporator technology for the Oil Sands market at the 2012 Global Petroleum Show, Booth # 7007, Halls D, E.

Modular, flexible and redeployable, SMARTMOD is the lowest CAPEX and life cycle cost evaporator system available today. It utilizes vertical tube falling film evaporator design, a proven technology for treating difficult produced water sources. Benefits of SMARTMOD over conventional evaporator systems include 10% lower power consumption. Its multiple section design ensures ASME distillate quality, and on-line washing allows for continuous distillate production at >70% of design capacity during washing.

SMARTMOD is also engineered to minimize field installation labor and costs. With its dramatically reduced center of mass and evaporator weight, the SMARTMOD module and vessels eliminate the need for building a large evaporator building or expensive foundation labor and materials. Its innovative design also reduces freight costs for transportation of the complete system to site.

"Aquatech is pleased to introduce this new evaporator design, which adds to our industry-leading portfolio of solutions for oil & gas producers and provides our clients with a unique solution to treat and reuse their produced water. We see a bright future with SMARTMOD(TM) in the Oil Sands market and believe that this technology will further expand our already successful global footprint in produced water treatment," said Alan R. Daza, Vice President of Sales & Business Development for Aquatech.

SAGD (Steam Assisted Gravity Drainage) is an enhanced oil recovery (EOR) technology for producing heavy crude oil and bitumen. It is an advanced form of steam stimulation where high pressure steam is injected into the formation, heating the bitumen in the formation, which lowers its viscosity and allows the mixture of bitumen and water from condensed steam to be pumped out.

The liquid that is pumped to the surface is a mixture of oil and water. The mixture is separated to a predominantly oil and water fractions in the de-oiling process. The water fraction (or Produced Water) is sent to the Aquatech system for treatment and reuse in the facility. In addition to the evaporator technology, Aquatech has supplied conventional systems that include Walnut Shell Filters, Warm Lime Softening, Afterfilters and Ion Exchange softening. Once purified, the produced water is used as feed to the boiler for steam generation and injected into the formation, and the cycle continues.

"Aquatech's evaporator systems like SMARTMOD are an excellent fit for the Oil Sands market. Whether it's for Produced Water or Boiler Blowdown treatment, the SMARTMOD provides high distillate purity, high continuous distillate production availability and significant reduction in field installation costs of approximately 75%," Daza noted.

For more information about SMARTMOD and Aquatech's comprehensive solutions for oil & gas, please visit


June 1, 2012

CRMB in UK Roads

The first major UK trial of a new asphalt made partly from recycled waste tyres has been successfully completed on behalf of Transport Scotland by Breedon Aggregates.

Late last month a short stretch of the A90 dual carriageway between Perth and Dundee was resurfaced with the revolutionary material and a recently-completed ‘grip test’ on the new surface has now confirmed its viability.

This stretch of road is one of the busiest in Scotland, carrying around 35,000 vehicles a day. Over the next few months the material will be closely monitored against a number of key performance criteria, including skid resistance, and the early indications are very encouraging.

Unlike previous attempts at using rubber in asphalt, which usually involved trying to melt the rubber completely before mixing it with stone and bitumen, Breedon Aggregates has secured access to new technology from Danish company Genan which enables it to incorporate rubber particles directly into the binding agent. This is achieved at lower temperatures, with lower levels of emissions, bringing significant environmental benefits.

“This could transform our approach to road surfacing in the UK,” said Alan Mackenzie, chief executive of Breedon Aggregates Scotland. “Our industry has been trying for years to successfully incorporate recycled rubber into asphalt, without much success. Thanks to this new technology, which we are partnering with Genan to promote in the UK, we can help change that.”

Since 2006, EU rules have banned the disposal of tyres to landfill, leaving large quantities of shredded rubber to find alternative uses in various forms of recycling. According to the European Tyre and Rubber Manufacturers Association, nearly 480,000 tonnes of used tyres arose in the UK in 2009.

LCA (Life Cycle Assessment) studies show that for every ton of scrap tyres used for rubber modification of bitumen and asphalt, 1.1 tons of CO2 emissions are saved compared with incineration of the tyres (for example, in cement kilns).

“We’re bringing to market an asphalt which is more economical and environmentally friendly than any comparable product currently available,” added Mr Mackenzie.

“We’ll be drawing on a readily-available recycled raw material, reducing the proportion of expensive stone and bitumen in the mix and cutting the amount of gases and fumes produced, so it’s an all-round win for us and for our customers.”

Transport Scotland (TS) commented: “We are pleased that industry has identified this opportunity and developed an alternative surfacing material for use on the trunk road network. This adopts a sustainable approach in making the best use of resources available, by re-using an abundant waste material and thereby reducing the use of oil-based bitumen products. TS will continue to work collaboratively with the industry under the auspices of the TS Pavement Forum and we look forward to the continued success of this initial trial.”

Following the success of the trial in Scotland, Breedon Aggregates will now begin to market the new material, to be called Breedon Polymer R+, from its 18 asphalt plants throughout Scotland and England.

Source- Clickgreen

April 24, 2012

Bitumen Shortage in Cape Town

City calls upon National Government to intervene in on-going bitumen shortage

Councillor Brett Herron, Mayoral Committee member for Transport, Roads and Stormwater has written to the Ministers of Energy and Transport calling upon them to intervene to secure a reliable and predictable supply of bitumen. The supply of bitumen, an essential component in the production of asphalt required for the maintenance and construction of roads in the City, has been erratic and unreliable since last year. This is impacting negatively on Council's ability to keep up with construction and maintenance programs and may continue to do so over the coming months. This could potentially result in under spend on operating and capital budgets.

Bitumen is a by-product from oil refineries and, due to factors such as breakdowns, production changes at refineries, and changes in the Middle-East supply situation, has been difficult to source for the City's road maintenance projects. The local refinery, for example, no longer produces the grade of bitumen required for the production of asphalt specified for Council's road surfacing.

We have been advised by one of our asphalt suppliers that the erratic bitumen supply situation will probably continue for the foreseeable future. This could impact negatively on road construction not only in Cape Town, but on a national scale as well.

Councillor Brett Herron, Mayoral Committee member for Transport, Roads and Stormwater says, "Everything possible is being done to ensure that the impact of the present bitumen supply situation is minimised but delays on certain projects could still occur."

Councillor Herron has called on the national Ministers of Transport and Energy to take urgent steps to ensure that South Africa's future supply of bitumen is protected as it is a resource that is essential in preserving South Africa's economic growth trajectory. "It is absurd that oil producers are continuing to export bitumen while South Africa is having to import it in order to meet national demands. Not only this, but oil companies are not co-ordinating their maintenance schedules in such a way that there is always a reliable supply."


20 April 2012
 Minister J S Ndebele
Ministry of Transport
Private Bag X193
Fax: 012 328 3194

Dear Minister Ndebele,

Over the past year the City of Cape Town, together with the rest of the country, has endured an unpredictable supply of bitumen and at times a bitumen shortage. The lack of security of supply of bitumen undermines the planning and implementation of our infrastructure projects as well as the repairs and maintenance of our vital road network.

We welcomed the Minister of Finance's commitment to infrastructure led economic growth and development and in particular to the investment of approximately R70 billion in road infrastructure across the country.
As you are aware the City of Cape Town is also investing substantially in infrastructure. Over the coming MTREF budget period we are committing to significant improvements in our road infrastructure and a major expansion of our integrated rapid transit (IRT) service with concomitant investment in the required infrastructure.

Our current and future infrastructure projects require a reliable bitumen supply and the lack of security of supply places our projects in jeopardy of being implemented and/or completed. This will in turn undermine our commitment to providing the infrastructure necessary for economic growth, social inclusion and universal urban mobility.

Clearly, the various national and provincial road improvement projects the national budget has committed to are also at risk.

It is our view that our national government needs to take urgent steps to ensure a predictable and reliable supply of bitumen in order to effect our service delivery promises. I am, therefore, writing to call upon you to take the necessary steps to secure the bitumen supply required to implement the vast and important infrastructure projects we have all committed to.
These steps could include one or more of the following:
1. Declaring bitumen a strategic mineral resource which would require our refineries to maintain sufficient bitumen supply and reserves;
2. Ensuring that planned refinery maintenance is co-ordinated and staggered so that some bitumen supply continues whilst maintenance takes place; and
3. Prioritising local supply of bitumen over export.
I would welcome the opportunity to meet with you to discuss this crisis at your earliest convenience and look forward to hearing back from you urgently.

Yours faithfully,


Statement issued by Councillor Brett Herron, Mayoral Committee Member for Transport, Roads and Stormwater, City of Cape Town, April 23 2012

Source -Politicsweb 

November 25, 2011

Bitumen Shortage to Ease with Far East Supply to KSA

To alleviate a nationwide bitumen shortage, road builders have resorted to importing a container load of the key ingredient in the production of asphalt.

Last week, an eagerly awaited shipment of 4200t of bitumen arrived on the Tasco 1, a bitumen and asphalt carrier belonging to Tipco Maritime. The cargo was brought in by specialist manufacturer Colas from a refinery in Singapore.

The bitumen load is being divided among Raubex, Much Asphalt and smaller contractors, who have been forced to halt road construction projects because supply of the product has dropped. Workers on site were asked to take leave over the periods when bitumen supply came to a virtual standstill in September and October. The disruption was experienced over 45 days and work was suspended for up to three weeks.
Bitumen is produced at a number of oil refineries, including Caltex, Natref and Sapref. But scheduled maintenance shutdowns and a fire at the Sapref refinery, which caused an unscheduled shutdown, had a serious effect on supply.

Though the constraints have not affected the cost of bitumen, since it is priced at a set rate, contractors’ costs have soared.

Much Asphalt CEO Phillip Hechter estimates that the problem has cost the industry as much as R2,5bn.
Raubex financial director Francois Diedrechsen says the company has had to use the shipment to “make the best of a bad situation”, but that importing is not sustainable .

Bringing the bitumen into the country is expensive and complicated. The product is also slapped with a 10% import duty upon its arrival in SA. Diedrechsen says the duty was put in place to protect local refineries that produce bitumen, but that under the current conditions it no longer makes sense.

He says that road contractors have difficulty storing bitumen, which needs to be kept in temperature-controlled facilities. None of the contractors has this kind of infrastructure. If Raubex did have storage facilities or was able to store bitumen at refineries, Diedrechsen says, it would import large quantities at a time.
Much Asphalt will transport the product to 17 small facilities around the country. Hechter says that were oil refineries to import bitumen and store it at their existing facilities, companies would be spared having to use a ship as a storage facility and incurring costly docking charges. But he believes importing is going to become standard practice.

Diedrechsen agrees, but says that if refineries could indicate to the industry exactly what they intended producing, the industry could make decisions about building the infrastructure to store bitumen. It can’t do this without certainty that local production would not suddenly increase, he says.
Part of the problem, says Hechter, is that the average age of SA’s refineries exceeds 30 years, and that unscheduled maintenance has become more frequent.

To compound the local supply problem, Engen recently exported 4000t of bitumen and so could release a mere trickle of bitumen into the national market, Hechter says.

Bitumen users have been forced to rely on supply from the Natref refinery, which also has production constraints, and a Caltex refinery in the Western Cape, which is far from road construction sites and produces only one type of bitumen, whereas the industry uses three.

Companies have had discussions with the SA National Roads Agency and the department of transport. Were import duties to be dropped, bringing bitumen in from outside would be more affordable.
Sanral CEO Nazir Alli says national roads absorbed about 70% of SA’s total bitumen supply in 2010.

Shortages have a big impact on its projects, as it is used in the final surface layer of a road.
Earlier this year, Sanral considered asking the energy department to declare bitumen a strategic mineral . This would force refineries to maintain a minimum reserve. However, it is unclear whether Sanral will resort to this measure.

Source -

November 22, 2011

Insufficient Funds for Bitumen

DMC Construction Plc has been ordered to pay 11.7 million Br by the Federal High Court Ninth Civil Bench in the past two weeks after it lost two suits brought against it by the National Oil Company (NOC) and Liby Oil for issuing a cheque that bounced. 

 NOC and Libya Oil brought their suits in September and October, 2001, respectively. NOC, established in April 2007 by Mohammed Ali Al-Amoudi and partners including its current CEO, Tadesse Tilahun, filed its suit in summery procedure in the beginning of September claiming 6.7 million Br for a cheque that was issued to it without having sufficient funds. The cheque, which was issued from United Bank, Lebu-Lafto branch, was presented as evidence along with a letter from the bank stating insufficient funds for not being able to pay on the cheque. 

NOC had asked for the payment of the money including a nine per cent interest on the amount from August 30, 2011, the date payment was denied by the bank for lack of sufficient funds.  While the suit was pending hearing, NOC had asked the court to freeze the assets of DMC claiming that the construction company was trying to transfer its assets to avoid liability. 

Nuredin Keder, the presiding judge at the time, on October 11, 2011, had ordered bitumen asphalt mix found on road construction sites of the company in the Southern Regional State to be frozen during the litigation. The litigation came to end with the court, presided by Mekonnen G. Hiwot ruling, who replaced Nuredin after he was transferred, ruling in favour of NOC. 

Three days after the court had ordered the freeze on DMC, owned by Daniel Mamo and Bethlehem Abebe, Oil Libya had brought a similar suit against it. The oil company, which entered into the local market after it has acquired all assets and downstream operations including liabilities and privileges of Shell Ethiopia Ltd in 2009, sued DMC for issuing a bounced cheque for five million Birr. 

The payment was supposed to be for the supply of fuel products as agreed on a contract signed in December last year. However, the cheque issued from Nib International Bank (NIB) bounced when it tried to withdraw the money on September 20, 2011, the oil company said in its charge. Oil Libya also asked for the amount to payment of the amount it with interest calculated from this date it bounced.
Mekonnen, who also presided in the suit brought by Oil Libya, ruled in favour of the oil company.
DMC has been involved in many construction projects in the country, notable among which is the construction of asphalt roads in Hawassa town, 276Km south of Addis Abeba, which was created to change the face of the city. Although it was summoned in both cases to respond to the suits, the construction company did not. 

It is to pay a three per cent commission until the money is paid back in full, the court also ruled. The plaintiffs have to file a judgement execution to collect the money they are owed by DMC.    


October 20, 2011

Surface Dressing of Roads

Council prepares roads in Weston-super-Mare for winter

Profile image for vickifitz
By vickifitz | Tuesday, October 18, 2011, 10:53
North Somerset Council has been preparing the roads across Weston-super-Mare ready for winter. The annual programme of surface dressing is underway to protect the roads from icy conditions.

Deputy leader and executive member for highways at North Somerset Council, Elfan Ap Rees, said that surface dressing is a quick, low cost way of improving the condition and skid resistance of a road surface.

He said "It prevents water seeping into the foundations of the road and delays the need to carry out more extensive and costly carriageway repairs.

"We carry out surface dressing between the months of May and September as weather conditions need to be dry and warm to enable the bitumen to stick to the carriageway and ensure long-term stability of the dressing."

Roads which have been surface dressed are: part of West Town Road (A370), Backwell; Silver Moor Lane, Banwell; Ashey Lane, Blagdon; Bridgwater Road (A370), Coronation Road/Bleadon Road, and Shiplate Road, Bleadon; Burrington Coombe (B3134), Burrington; Blagdon Lane, Butcombe; Churchill Green/Sandmead Road, Churchill; Crookes Lane and Lower Norton Lane, Kewstoke; Broadmead Lane, Regil; and Tower House Lane, Wraxall.

The process involves spraying bitumen over the surface of the existing carriageway and covering it with a layer of stone chippings.
As the bitumen sets, the stone chippings are compacted in by the use of a roller and further assisted by vehicles travelling over the newly laid surface. Any excess chippings are then swept up.

The main contractor was Balfour Beatty and the cost for this year's programme is in the region of £270,000.

Source -

October 13, 2011

Polymer Modified Bitumen

Nagaland first to use waste tech for roads

Road construction using polymer-Bitumen at NPCB office, Dimapur  
Road construction using polymer-Bitumen at NPCB office, Dimapur

Dimapur, October 11 (MExN): Pollution authorities in Nagaland have refuted a news report stating Meghalaya to be the first state in the North Eastern region to use bitumen and waste plastic to pave roads. Nagaland Pollution Control Board (NPCB) issued a note today saying Nagaland has in fact used the stated technology way back in 2010.

Member secretary of the board, Rusovil John said in the note that the agency had used the technology for a stretch of road in Dimapur. “I would like to state that the Nagaland Pollution Control Board in the year 2010 has used this technology using the bitumen polymer (plastic waste) for construction of a road within the office compound at Signal Point, Dimapur. The Nagaland Pollution Control Board had also bought out a pamphlet on the technology of using plastic waste in road construction,” the agency said.
A PTI report had stated in a news report on October 5 that Meghalaya state was the first state from the NE to use the technology in constructing roads.    

October 11, 2011

Ethiopian Bitumen Market

A US Fortune 500 company, DuPont is preparing to enter potential markets in Ethiopia created by the government’s Growth and Transformation Plan (GTP). The company, placed 84th on the fortune 500, has initially focused its attention on the construction of roads.

The GTP includes plans to extend asphalt roads by over 100000Km across the country said Richard Ntombella, senior sales and technical officer for DuPont Sub-Saharan Africa. He added that improving road infrastructure is integral to the GTP and the economic development of the country.
“With the Road Network as the main supply chain for exporting and importing goods, it is essential that the infrastructure is capable of supporting GDP growth, as it plays a critical role in the development of other industries” said Ntombella at a the DuPont seminar held at Sheraton Addis to introduce its asphalt technology, Elvaloy.

The Asphalt materials previously used in road construction in Ethiopia have failed to withstand the demands made by heavy traffic and weather conditions explained Ntombella. Elvaloy has long been in use internationally as an additive to bitumen to help resist deterioration in the asphalt according to DuPont.
The Addis Ababa Roads Authority (AARA) and the Ethiopian Roads Authority are considering introducing the use of Elvaloy in upcoming road construction programs, according to sources. Both authorities were represented at the seminar conducted by DuPont.

The Dupont subsidiary in Ethiopia, pioneer, has been in business in Ethiopia as a supplier of high yield seeds for the past twenty years according to representatives of the organization.
Source: The Reporter

September 22, 2010

Bitumen Plant

Saratov region-based firm RBP intends to invest $48.6m building a plant to produce bitumen and polymer roofing and water-proof materials and mastic in Saratov region, news agency RIA Novosti reports.

The plant is reportedly to be located on a 6.8-hectare land site near the village of Dubki outside the city of Saratov.

The plant is scheduled to be put into commission in Summer 2011.

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