http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 16.23Change: -16.07
R/$ = 14.29Change: -14.15
Au 1265.75 $/ozChange: 1.48
Pt 1051.50 $/ozChange: 5.50
 
 
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 About 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|Casting|Concrete|Design|Installation|Road|Roads|Water|Africa|Europe|Germany|South Africa|Bosun Facility|Concrete Paving Solutions Manufacturer|Equipment|Manufacturing|Products|Solutions|Mandela Bay|David Wertheim Aymes|Proximity|Gert Sibande
Construction||Africa|Aggregates|Bosun|Casting|Concrete|Design|Installation|Road|Roads|Water|Africa||||Equipment|Manufacturing|Products|Solutions|||Proximity|
construction|johannesburg|nelson-mandela-bay-city|steyn-city|tshwane|africa-company|aggregates|bosun|casting|concrete|design|installation|road|roads|water|africa|europe|germany|south-africa|bosun-facility|concrete-paving-solutions-manufacturer|equipment|manufacturing|products|solutions|mandela-bay|david-wertheim-aymes|proximity|gert-sibande



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
Creamer Media Senior Deputy Editor Online

To subscribe email subscriptions@creamermedia.co.za or click here
To advertise email advertising@creamermedia.co.za or click here
 
Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Construction News
Updated 1 hour 42 minutes ago South Africa’s programme to acquire a number of new nuclear power plants (NPPs) seems to be suffering from yet another delay. The Requests for Proposals to the various groups interested in constructing these new NPPs that were apparently meant to have been issued on...
NO GROWING PAINS Chryso SA CEO Norman Seymore explains his company's continued growth despite depressed market conditions
Updated 1 hour 42 minutes ago Construction chemicals producer Chryso Southern Africa continues to innovate and expand, offsetting the decrease in major civil projects. Chryso Group VP and Chryso South Africa (SA) CEO Norman Seymore notes that, aside from a few high-profile building projects in...
Updated 1 hour 42 minutes ago South Africa lacks the skills necessary to implement the government’s plan to build 9.6 GWe of new nuclear energy capacity, warns nuclear-qualified Quality Strategies International CEO David Crawford. “Apart from the concern about the affordability of the programme,...
More
 
 
Latest News
In an attempt to maintain a pro-poor stance on public spending aimed at improving social development, the City of Ekurhuleni will inject R3.5-billion of its 2016 budget for into its community empowerment package, Mintirho Ya Vula Vula. Tabling the budget vote for the...
African private equity firms cashed in on investments last year at the highest rate in almost a decade, with South Africa, Egypt, Nigeria and Kenya accounting for two-thirds of these exits. Equity firms sold investments in 44 companies in 2015, compared to 39...
More
 
 
Recent Research Reports
Automotive 2016: A review of South Africa's automotive sector (PDF Report)
Creamer Media’s Automotive 2016 Report provides an overview of South Africa’s automotive industry over the past 12 months. The report provides insight into local demand and production, vehicle imports and exports, investment and competitiveness in the sector, as well...
Energy Roundup – April 2016 (PDF Report)
The April 2016 roundup covers activities across South Africa for March 2016 and includes details of a North Gauteng High Court Judge’s dismissal of a court application to postpone the 9.4% electricity tariff increase, which the National Energy Regulator of South...
Electricity 2016: A review of South Africa's electricity sector (PDF Report)
Creamer Media’s Electricity 2016 report provides an overview of South Africa’s electricity sector, focusing on State-owned power utility Eskom and independent power producers, electricity planning, transmission, distribution and the theft thereof, besides other issues.
Energy Roundup – March 2016 (PDF Report)
The March 2016 roundup covers activities across South Africa for February 2016 and includes details of the Department of Energy’s plans to announce the preferred bidders for the first tranche of the coal independent power producer procurement programme; the Council...
Steel 2016: A review of South Africa's steel sector (PDF Report)
Creamer Media’s Steel 2016 Report examines South Africa’s steel industry over the past 12 months. The report provides insight into the global steel market and and particularly into South South Africa’s steel sector, including production and consumption, main...
Construction 2016: A review of South Africa's construction industry (PDF Report)
Creamer Media’s Construction 2016 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; key participants; local demand; geographic diversification; corporate activity; black economic...
 
 
 
 
 
This Week's Magazine
Updated 1 hour 38 minutes ago The two spent-fuel pools at Eskom’s 1 800 MW Koeberg nuclear power station, in the Western Cape, will be full by 2018, increasing the urgency on the State-owned utility to begin pursuing alternative storage options. Koeberg has, over the past 32 years, accumulated a...
Updated 1 hour 38 minutes ago South Africa lacks the skills necessary to implement the government’s plan to build 9.6 GWe of new nuclear energy capacity, warns nuclear-qualified Quality Strategies International CEO David Crawford. “Apart from the concern about the affordability of the programme,...
DOROS HADJIZENONOS The 700-series devices provide network security monitoring, app control, URL filtering, VPN security, antivirus, antispam, antibot, and advanced intrusion prevention and detection functionality
Updated 1 hour 38 minutes ago Cybersecurity multinational Check Point has released its latest 700-series cybersecurity systems for small businesses, which draw on its international threat intelligence to provide up-to-date cybersecurity, says Check Point South Africa country manager Doros...
Updated 1 hour 38 minutes ago Daimler Trucks and Buses Southern Africa (DTBSA) saw a marked slip in new-vehicle sales in 2015 compared with 2014, with sales dropping from 5 897 units to 5 300 units. The decline came as the South African new truck and bus market declined from 31 558 units in 2014...
Updated 1 hour 38 minutes ago Group of 20 (G-20) economies threatened to penalise havens that don’t share information on their banking clients after the leak of the Panama Papers provoked a global uproar over tax evasion. The G-20 will consider “defensive measures” against financial centers and...
 
 
 
 
 
 
 
 
 
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 $149 Close
Subscribe Now for $149