http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 13.14Change: -0.15
R/$ = 12.05Change: -0.20
Au 1200.03 $/ozChange: -6.12
Pt 1139.50 $/ozChange: -16.00
 
 
Note: Search is limited to the most recent 250 articles. Set date range to access earlier articles.
Where? With... When?








Start
 
End
 
 
And must exclude these words...
Close Main Search
Close Main Login
My Profile News Alerts Newsletters Logout Close Main Profile
 
Agriculture   Automotive   Chemicals   Competition Policy   Construction   Defence   Economy   Electricity   Energy   Environment   ICT   Metals   Mining   Science and Technology   Services   Trade   Transport & Logistics   Water  
What's On Press Office Tenders Suppliers Directory Research Jobs Announcements Letters Contact Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Oct 12, 2012

New kerb design offers quicker installation

Back
Construction|Johannesburg|Nelson Mandela Bay|Steyn City|Tshwane|Africa|Aggregates|Bosun|Concrete|Design|Road|Roads|Water|Africa|Europe|Germany|South Africa|Bosun Facility|Concrete Paving Solutions Manufacturer|Equipment|Manufacturing|Products|Solutions|Mandela Bay|David Wertheim Aymes|Water|Proximity|Gert Sibande
Construction||Africa|Aggregates|Bosun|Concrete|Design|Road|Roads|Water|Africa||||Equipment|Manufacturing|Products|Solutions||Water|Proximity|
construction|johannesburg|nelson-mandela-bay-city|steyn-city|tshwane|africa-company|aggregates|bosun|concrete|design|road|roads|water-company|africa|europe|germany|south-africa|bosun-facility|concrete-paving-solutions-manufacturer|equipment|manufacturing|products|solutions|mandela-bay|david-wertheim-aymes|water|proximity|gert-sibande
© Reuse this



Following the success of concrete paving solutions manufacturer Bosun’s redesigned Figure 8C castle bottom kerb, the company is now planning to also produce Figure 7 and Figure 3 barrier kerbs with castle bottoms.

Bosun has already ordered the required equipment from its Germany-based supplier to enable it to add the two new products to its range.

“We expect to start production of the Figure 7 semimountable and Figure 3 Bosun castle bottom kerbs in early 2013,” notes CEO David Wertheim Aymes.

The company launched the Figure 8C castle bottom kerb, which features cavities across the bottom of their surface to allow for easier handling and installation, in May.

The kerbs are manufactured in two lengths – 300 mm and 1 000 mm. Both lengths have a width of 300 mm and a height of 200 mm. The 300-mm-long kerb weighs about 36 kg, while the 1 000-mm-long kerb weighs about 107 kg.

Wertheim Aymes says Bosun found that when they were installed at road construction sites, the castle bottom kerbs were about 40% quicker to install than conventional kerbs.

“When installing conventional kerbs, if the screed surfaces are uneven, installers are forced to lift, refill and relay the kerb. With a castle bottom kerb, it is easier to manoeuvre it into place, as the screed is displaced by the cavities of the kerb, allowing it to sink into the screed,” he explains.

This, in turn, provides better adhesion and has more points of sure bonding, he adds.

Further, the castle bottom kerb, designed and manufactured at the Bosun facility, in Midrand, is less prone to movement than flat kerb surfaces.

Flat bottom kerbs also do not have consistent support from the screed. In some cases, critical areas of the surface may not be in contact with the screed, resulting in kerb breakages once weight is applied from above.

The regular points of sure bonding of the castle bottom kerbs and their proximity to one another negated this possibility, says Wertheim Aymes.

He says that, since their launch, the kerbs have been installed on a variety of roads, such as provincial and municipal roads, on existing road upgrades, as well as on new roads from Orange Farm, about 45 km south of Johannesburg, to lifestyle development Steyn City, located along the Jukskei river, in Johannesburg.

Bosun directly and indirectly supplies various local governments with paving and kerbs. These include the City of Johannesburg, the City of Tshwane, the Nelson Mandela Bay metropolitan municipality and various smaller municipalities like the Gert Sibande district municipality and the Steve Tshwete local municipality, in Mpumalanga.

Kerbs prevent drivers from parking or driving on areas beside a road, while mountable kerbs make it possible for vehicles to access these areas. Kerbs also provide structural support to the pavement edge and prevent the degradation of road edges. They also channel runoff water into storm drains.

Wertheim Aymes says kerb manufacturers should adhere to the SANS 927 specification for precast kerbs, but adds that it is also important to note the way in which kerbs are manufactured.

Essentially, kerbs are manufactured through wet cast or dry cast methods.

In Europe, kerbs have for decades already been manufactured in the dry cast method, whereas, in South Africa, kerbs have traditionally been produced by means of casting a wet concrete mix in moulds, which is then left to cure and then demoulded.

Large stones and other aggregates tend to settle very close to the surface of the kerb and, with slight abrasion to the kerb, the unsightly aggregates are exposed.

Wet cast manufacturing also requires vibration to eliminate air pockets from forming in the concrete. If this is not done for long enough, pin holes form on the surface of kerbs, potentially negatively affecting the quality of the kerbs, he explains.

In addition, the manufacturer’s production capacity is limited by the number of moulds available.

With the dry cast method, a block-making machine forms, compacts and vibrates a dry concrete mix into shape instead of using moulds to form the shape.

Casting production is not restricted by the number of available moulds and Wertheim Aymes says this ensures a reliable supply for all its customers.

Edited by: Chanel de Bruyn
© Reuse this Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Construction Materials News
PPC CEO Darryll Castle
Following his first 100 days as CEO of cement producer PPC, Darryll Castle reports that action plans have been put in place to more aggressively win back market share within South Africa, while pressing ahead with its high-potential African expansion strategy. A...
Article contains comments
US shareholder adviser ISS has recommended Holcim investors back the Swiss cement maker's proposed merger with France's Lafarge ahead of next month's shareholder vote on the $40-billion tie-up. Backing from ISS is a boost to Zurich-based Holcim as it seeks to win the...
JSE-listed construction company Stefanutti Stocks has appointed Antonio Cocciante as CFO and executive director, effective June 1. He would succeed outgoing CFO and executive director Dermot Quinn, who was stepping down on May 31. Quinn would continue to serve on...
More
 
 
Latest News
South African mining and energy adviser Ted Blom has raised a litany of concerns about the state of power utility Eskom and has warned of runaway costs and shortfalls in coal and water, as well as rail capacity. Blom was surprised by the recent buoyancy shown by...
JSE-listed Astrapak will sell specialised packaging systems manufacturer Knilam to Mapflex SA for R17.7-million. The proceeds would be used to reduce Astrapak’s current level of gearing.
The last of the 26 mooring units comprising the Port of Ngqura’s automated mooring system (AMS) have arrived at the port and are expected to improve port efficiency and safety, further driving the Transnet National Ports Authority’s (TNPA’s) objective of establishing...
More
 
 
Recent Research Reports
Steel 2015: A review of South Africa's steel sector (PDF Report)
Creamer Media’s Steel 2015 report provides an overview of the key developments in the global steel industry and particularly of South Africa’s steel sector over the past year, including details of production and consumption, as well as the country's primary carbon...
Projects in Progress 2015 - First Edition (PDF Report)
In fact, this edition of Creamer Media’s Projects in Progress 2015 supplement tracks developments taking place under the Renewable Energy Independent Power Producer Procurement Programme, which has had four bidding rounds. It appears to remain a shining light on the...
Electricity 2015: A review of South Africa's electricity sector (PDF Report)
Creamer Media’s Electricity 2015 report provides an overview of State-owned power utility Eskom and independent power producers, as well as electricity planning, transmission, distribution and the theft thereof, besides other issues.
Construction 2015: A review of South Africa’s construction sector (PDF Report)
Creamer Media’s Construction 2015 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; the key participants in the sector; local construction demand; geographic diversification;...
Liquid Fuels 2014 - A review of South Africa's Liquid Fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2014 Report examines these issues, focusing on the business environment, oil and gas exploration, the country’s feedstock supplies, the development of South Africa’s biofuels industry, fuel pricing, competition in the sector, the...
Water 2014: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2014 report considers the aforementioned issues, not only in the South African context, but also in the African and global context, and examines the issues of water and sanitation, water quality and the demand for water, among others.
 
 
 
 
 
This Week's Magazine
Sappi Southern Africa CEO Alex Thiel
Forest products group Sappi has confirmed the selection of its 25 MW biomass-to-power project, to be erected at its Ngodwana mill, in Mpumalanga, as a preferred bidder under the South African government’s Renewable Energy Independent Power Producer Procurement...
Information and communications technology (ICT) distributor DCC is making Windows- and Android-operating systems tablets available through retailers and education equipment suppliers to provide school children with affordable, high-performance education tools. The...
Another cement manufacturer is set to enter the Ugandan market, raising hopes that prices will come down and spur growth in the construction industry. National Cement, a Kenyan manufacturer, has unveiled plans to invest $195-million in a new manufacturing plant in...
With growth rates exceeding that in the developed world – at an average of between 4% and 5% between 2002 and 2014 – African countries provide investors with ample reason to tap into booming consumer demand says Manufacturing Circle executive director Coenraad...
The South African Chamber of Commerce and Industry’s (Sacci’s) Business Confidence Index (BCI) decreased by 3.7 index points month-on-month to 89.1 in March.
 
 
 
 
 
 
 
 
 
Alert Close
Embed Code Close
content
Research Reports Close
Research Reports are a product of the
Research Channel Africa. Reports can be bought individually or you can gain full access to all reports as part of a Research Channel Africa subscription.
Find Out More Buy Report
 
 
Close
Engineering News
Completely Re-Engineered
Experience it now. Click here
*website to launch in a few weeks
Subscribe Now for $96 Close
Subscribe Now for $96