http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 13.15Change: -0.05
R/$ = 11.65Change: -0.10
Au 1283.66 $/ozChange: 10.51
Pt 1240.50 $/ozChange: 12.30
 
 
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  
 
 
Mar 26, 2004

Plasticiser allows two hours of concrete workability

Back
Construction|Expertise|Africa|Aggregate|Chryso France|Chryso South Africa|Concrete|Design|Readymix|Water|Africa|South Africa|Product|Norman Seymore|Water|Chrysofluid Optima
Construction|Expertise|Africa|Aggregate|Concrete|Design|Readymix|Water|Africa|||Water|
construction|expertise|africa-company|aggregate|chryso-france|chryso-south-africa|concrete|design|readymix|water-company|africa|south-africa|product|norman-seymore|water|chrysofluid-optima
© Reuse this A plasticiser providing unprecedent- ed two-hour-long workability of concrete, called Chrysoplast Omega 101, has been launched by Chryso South Africa. The new product created significant interest when launched by Chryso France at the Paris Batimat expo in November, last year, and will be welcomed by large- and small-scale concrete producers in South Africa, says MD Norman Seymore. He adds that the development of the new nontoxic plasticiser was as a result of Chryso customers increasingly calling for concrete – whether readymix, pumped or construction concrete, to retain its workability for longer periods; concrete plasticity at the time of pouring to maintain this workability – from batching to pouring on site; and improvement of the general aesthetics of the concrete. “These were significant technical challenges for Chryso. “In the first place, we had to design an admixture able to add record consistency to concrete, using relatively small plasticiser dosages. “Moreover, the plasticiser also had to offer flexibility, and has a more pleasing final appearance than ordinary concrete. “The new plasticiser, Chrysoplast Omega 101, is sufficiently flexible to be used within a wide range of dosages from 0,2% to 1,2% of cementitious content, ranging from low-workability concrete to fluid concrete. “Fluidity can be maintained for up to two hours to accommodate problems on site, the management of truck fleets, and to add a level of reactivity that enables the shuttering to be struck at 16 hours instead of 28 hours, even at low temperatures,” says Seymore.

He adds that the improved aesthetics of the concrete was achieved by the production of homogenous concrete devoid of bleeding characteristics.

Chryso France met the product development challenges by creating an entirely new molecule. “Chryso is the only admixture producer to have evolved structures based on the chemistry of polyoxyethylene diphosphonates. “These structures improve concrete performance and maintain workability. “Further, the company is a leader in the chemistry of polyoxyethelene polycarboxylates with, for example, the recent development of its Chrysofluid Optima and Premia ranges of new-generation water-reducing admixtures. “Given the expertise in these two areas and in organo-mineral interactions, Chryso created the molecule and Chrysoplast Omega 101 emerged,” Seymore explained.

Recent tests of the new plasticiser showed that it improves concrete cohesion substantially through maximum aggregate coating, and prevents bleed-water rising to the surface. Further, European and local trials showed that workability can be maintained for two hours, using dosages ranging from 0,3% to 0,5% of cementitious content.
Edited by: zeena isaacs
© Reuse this Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Chemicals News
Petrochemicals giant Sasol, which typically incinerates its waste sludge streams or sends them to hazardous waste sites, is increasing its use of composting to treat these streams at its Secunda plant, in Mpumalanga, reducing transportation and disposal costs, as...
Petrochemicals giant Sasol, which typically incinerates its waste sludge streams or sends them to hazardous waste sites, is increasing its use of composting to treat these streams at its Secunda plant, in Mpumalanga, reducing transportation and disposal costs, as...
Afrox expects its earnings before interest, taxes, depreciation and amortisation (Ebitda) before any restructuring costs for the year ended December 31 to be between R792-million and R836-million, 5% to 10% less than the previous year’s R880-million. This decrease,...
Article contains comments
More
 
 
Latest News
SAA acting CEO Nico Bezuidenhout, Finance Minister Nhlanhla Nene and SAA chairperson Dudu Myeni
Finance Minister Nhlanhla Nene has assured that loss-making national carrier South African Airlines (SAA) will not receive another bailout from government, noting that the most recent R6.4-billion government guarantee had only been provided in support of an intensive...
South Africa's cumulative trade deficit was R95.3-billion in 2014, the South African Revenue Service (Sars) said on Friday. In 2013, it was R71.4-billion, Sars said in a statement.
Certain regulatory approvals remain outstanding in Telkom’s proposed R2.67-billion takeover of JSE-listed Business Connexion (BCX), the parties said in an update to shareholders on Friday. BCX noted in the statement that the Competition Authority of Botswana had...
More
 
 
Recent Research Reports
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.
Defence 2014: A review of South Africa's defence industry (PDF Report)
Creamer Media’s Defence 2014 report examines South Africa’s defence industry, with particular focus on the key participants in the sector, the innovations that have come out of the sector, local and export demand, South Africa’s controversial multibillion-rand...
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move road...
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
 
 
 
 
 
This Week's Magazine
The international Square Kilometre Array (SKA) radio telescope – which is to be jointly hosted by South Africa and Australia with, later, outstations in other countries – may not yet exist, but international scientific working groups are already deciding what...
A free Web-based solar power plant capacity-planning tool offers project planners and developers, as well as governments, a means to assess the solar energy potential of thin-film solar PV power over an area of land. The tool was developed by thin-film solar...
As yet, no specific methodology, timeline or costs have been finalised to remedy the water ingress, excessive to contractual specifications, into the Gautrain tunnel between emergency shaft two (E2) and Park Station, says Bombela Concession Company technical and...
ASTRAPAK The group highlighted that executive strategic interventions and other group-wide business improvement imperatives were progressing favourably
The “seriously disruptive” electricity outages in South Africa have cost packaging group Astrapak more than R2-million in “irrecoverable downtime costs”, the company said on Monday, adding that the power cuts were negating some of the benefit of energy saving...
Bakkies and more affordable cars dominated South Africa’s new vehicle market in 2014. Unaudited data from the Department of Trade and Industry (DTI) shows that South Africa’s most popular vehicle in 2014 was the Toyota Hilux, selling 37 562 units.
 
 
 
 
 
 
 
 
 
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