ONLY 10 percent of the surfaced (tarred) national road network is in good condition, with 30 percent in poor condition while 57 percent is in fair condition, a senior Government official has said. About 3 percent of the road network has been ...

ONLY 10 percent of the surfaced (tarred)... and more...


ONLY 10 percent of the surfaced (tarred)...

ONLY 10 percent of the surfaced (tarred) national road network is in good condition, with 30 percent in poor condition while 57 percent is in fair condition, a senior Government official has said.

 

About 3 percent of the road network has been unclassified, 1 percent of gravel and earth roads were certified to be in good condition, 22 percent was in fair condition, 72 percent was said to be in poor condition while five percent was unclassified at this stage.

In response to this situation, Government has initiated a number of road rehabilitation projects, including building new ones. Some of the road rehabilitation projects initiated through the Ministry of Transport and Infrastructure Development include. . .

Tenders will be awarded on a Build Operate Transfer (BOT) basis for the Beitbridge-Bulawayo-Victoria Falls, Harare-Nyamapanda and Rutenga-Boli-Sango roads before the end of this year.

Currently, feasibility studies and detailed engineering designs are underway for the Beitbridge-Bulawayo road and should be completed by August this year, after which tenders will be floated.

Transport and Infrastructure Development Minister Dr Jorum Gumbo said Government had made significant investment into the road network and more funds would be channelled towards infrastructure. The minister said about $300 million had so far been channelled into infrastructure development, including road rehabilitation.

"Some $13,28 million was spent on rehabilitation and maintenance of road infrastructure in 2015 and $11,44 million in 2016. At the same time, rehabilitation of the Plumtree-Mutare road was done from 2012 to 2016 at a cost of $206 million," said Dr Gumbo.

"In the aviation sector, the major investment has been upgrading of Victoria Falls Airport in the last three years to December 2016, at a cost of about $150 million. There was also some money spent on rehabilitation of the runway at Harare International Airport," he said.


All the road works were funded by the Zimbabwe National Road Authority and the Ministry of Finance and Economic Development.

"There has been no private financing of transport infrastructure development since the New Limpopo Bridge in 1994 and Beitbridge-Bulawayo Railway (BBR) in 1998.

"The Plumtree-Mutare project was financed through a loan obtained by ZINARA from DBSA (of South Africa). Victoria Falls Airport was financed by a loan to Civil Aviation Authority of Zimbabwe from China," said Dr Gumbo.

Minister Gumbo said the National Railways of Zimbabwe also carried out some rehabilitation work on the national railway network.

The condition of the country's road network had deteriorated since the last condition survey in 2010. At that time, 20 percent of the national road network was assessed to be in good condition, 30 percent in fair condition and 50 percent in poor condition. Ongoing road projects include the dualisation of Beitbridge-Harare-Chirundu highway, including the Harare Ring Road.

"The construction team has started arriving from China, and construction is expected to start in September this year," he said.

"We are also going to construct Phase 2 of the Harare International Airport Road. The late commencement has been due to delays in carrying out the required feasibility study. Again this will be done and project implementation will commence before the end of the year." the Minister added.

More funds, especially foreign direct investment, could have been channelled towards road projects, among other infrastructure development projects, but lack of appropriate and adequate legislation governing Public Private Partnerships was a hindrance.

"However, we now have the Joint Venture Act, and we trust that from now on we will be able to attract significant levels of FDI in transport infrastructure development," the Minister added.

Source - Bulawayo
    
 


£165m roads project facing legal challenge


A long-awaited £165m roads project for Belfast is now facing a legal challenge, it has emerged.

 

Around eight years after it was first announced, cash was finally earmarked for the York Street Interchange development as part of the DUP's £1bn deal with the Tories.

But now, a legal challenge, which has been confirmed by the Department for Infrastructure, over the awarding of the main construction contract, could delay the scheme further.

DUP Tory deal new £1bn allocation breakdown - where will the money go in Northern Ireland?

The Department has said that “the tender process to appoint a contractor to bring the scheme to a construction ready stage has now been completed... however, tender award cannot occur at present due to a legal challenge. The legal process is ongoing.”

The interchange is intended to solve the Belfast's increasing traffic problems.

It aimed to transform traffic flow where the Westlink, M2 and M3 converge.

The bulk of the cash needed to build it, around 40%, was originally due to come from the EU.

The upgrade of the York Street Interchange aims to tackle the traffic gridlock which occurs daily.

As Northern Ireland's busiest junction, it carries 100,000 vehicles daily, mostly commuters to and from Belfast from around Co Antrim.

It was revealed this week that part of a £1bn fiscal package for Northern Ireland as part of the DUP deal with the Conservatives, will include £400m for infrastructure. And as part of that, money will be freed up for the York Street Interchange.

At the end of last year, former Infrastructure Minister Chris Hazzard accepted a recommendation from a public inquiry that the York Street Interchange scheme should progress in principle but reiterated warnings that Brexit had placed a question mark over funding.

Speaking about the project, Wesley Johnston, an expert on Northern Ireland's roads, has said that commuters can still expect delays at the York Street interchange even after work has been completed.

Belfast Telegraph Digital
    
 


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
    
 
 


TOT or Advance Selling of Human Traffic Loads ?

The National Highways Authority of India (NHAI) is preparing to start the process of monetizing toll-based operational road assets under the toll, operate and transfer (TOT) model, aimed to bring new investments to the highways sector.

“We have not as yet floated tenders to monetize road assets, but are preparing to do so. We expect to begin doing this in 2-3 months’ time under the TOT model,” NHAI chairman Raghav Chandra said in an email response to queries from Mint.

This will be India’s first exercise in auctioning NHAI’s operational projects after a cabinet clearance in August. The proceeds will fund new highway projects under various models.

NHAI is currently working on the guidelines for TOT, under which the investor will collect tolls and be responsible for operation and maintenance of the project. The TOT model will be essential to attract long-term foreign investment, financial investors and investment bankers told Mint.

NHAI can lease up to 75 national highway projects which are fetching tolls for at least two years to various entities on the TOT model. The overall annual toll collected from these projects is about Rs2,700 crore, against which NHAI can expect to raise Rs25,000-30,000 crore by granting 30-year concessions, said Ashish Agarwal, director (infrastructure) at investment bank Equirus Capital.

The TOT model is long overdue, said Gautam Bhandari, partner at I Squared Capital, a US-based investor in road projects. “We are hopeful that NHAI finally does launch its TOT programme so that it can serve as a model for other sectors as well. As a global investor, we believe that NHAI’s TOT model, if executed properly, could be a win-win for everyone. Proceeds from TOT auctions will free up valuable taxpayer capital that can then be recycled for much-needed new infrastructure projects,” he said.

I Squared is looking to invest as much as $1 billion in Indian infrastructure. It has invested more than Rs1,000 crore through its investment platform Cube Highways and Infrastructure Pte. Ltd in three road projects so far.

IDFC Alternatives, which has bought controlling stakes in operational road projects, is waiting to see the fine print. “The good part is that in the TOT model, there are far less variables and concerns to be addressed as compared to projects with embedded construction risks. The differences in the bids here would be more a function of how differently each investor views the traffic growth rates, maintenance costs, synergies with other projects in one’s portfolio, if any,” said Aditya Aggarwal, partner (infrastructure), IDFC Alternatives.

There is significant interest from international infrastructure funds in the Indian road sector, said Rahul Mody, managing director, Ambit Corporate Finance Pvt. Ltd. “The TOT model is an excellent idea. The model takes away two key risks in the road sector—delays or cost overruns and initial traffic discovery—as the assets that will be offered under this (model) will be operational with some tolling history; hence it should attract considerable interest from Indian companies as well as foreign investors,” Mody said.

“The model can be an avenue for NHAI to raise upfront capital to fund the EPC and HAM projects; opportunity to feed the increasing number of pension funds and infrastructure investors having access to low cost capital and further deepen the infrastructure market; and allowing players to choose better the nature of risk-reward play they want to play in the road sector,” Agarwal said.

Source- LiveMint
    
 

Global Bitumen Market

The global bitumen market is forecast to grow at a Compound Annual Growth Rate (CAGR) of four percent between 2015 to 2020, and the world’s largest energy traders such as the Vitol Group and the Trafigura Group Pte. are in a race to increase their market share.

The bitumen market was valued at around $75 billion in 2014 and is expected to reach $94 billion in 2020, according to a report by Zion Research, titled, “Bitumen (Paving Bitumen, Oxidized Bitumen, Cutback Bitumen, Bitumen Emulsion, Polymer Modified Bitumen and Others) Market for Roadways, Waterproofing, Adhesives, Insulation and Other Applications - Global Industry Perspective, Comprehensive Analysis and Forecast, 2014 – 2020”.

Bitumen is a semi-solid form of petroleum, which is used to make asphalt for roads, waterproofing for roofs, insulation, and adhesives. It is either obtained by distillation of petroleum or is available naturally, such as in Canada’s oil sands.

Bitumen is used mainly in road manufacturing. A surge in road construction activity in Asia will propel growth for the product going forward. 75 percent of the global consumption of bitumen was used for road construction in 2014.

Waterproofing of roofing and building construction was the second major consumer of bitumen in 2014. Increased construction of homes to cater for the growing population is likely to add to the bitumen demand in the future.

Along with roofing, polymer modified bitumen (PMB), which is used as a chemical additive and adhesive, will witness rapid growth compared to other forms of bitumen.

Trucks, trains, and barges have been used traditionally to transport bitumen from refineries to local consumers; however, a drop in supply from the aging refineries in the U.S. and Europe has necessitated the use of oceangoing tankers, to supply the material from its source of production to the end consumer.

Vitol, the largest independent oil-trading house teamed up with U.S.-based Sargeant Marine Inc., which distributes asphalt to customers worldwide to form Valt, which operates the world’s largest dedicated asphalt fleet, handling parcel sizes from 20 metric tons up to 37,000 metric tons through its fleet of fourteen specialist vessels, according to its website.

“It used to be mostly a small distribution business,” Chris Bake, a senior executive at Rotterdam-based Vitol, said in an interview. “Now it is more of a whole arbitrage business requiring a global reach and shipping capacity,” reports Bloomberg.

Trafigura group is also not far behind. Its Singapore-based unit, Puma Energy has added four new bitumen vessels, taking the total number of vessels to 11, which cater to the Asian markets.

“We see a definite upward trend in the number of nautical miles for bitumen,” said Valt Chief Commercial Officer Nick Fay, who estimates an annual increase of about 7 percent. “All the new refineries that are getting built don’t make bitumen,” reports Bloomberg.

The Guvnor Group is planning to invest in the Perth Amboy asphalt refinery and storage facility in New Jersey, which has been shut since 2008, reports Bloomberg.

There is hardly any public information about the bitumen market, which makes it ideal for the large energy traders, who use their energy expertise and global connection to supply to far-off markets.

“There is a perception that the world is going to be more disconnected -- supply and demand-wise -- and we are there to help connect the dots,” Klintholm said.

Nonetheless, increased use of asphalt for roads and environmental concerns with bitumen manufacturing could pose a risk for the growth of the bitumen industry in the future.

By Rakesh Upadhyay for Oilprice.com
    
 

More Recent Articles

You Might Like

Click here to safely unsubscribe from "Bitumen."
Click here to view mailing archives, here to change your preferences, or here to subscribePrivacy