http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 13.05Change: -0.13
R/$ = 11.68Change: -0.15
Au 1221.96 $/ozChange: 4.46
Pt 1192.50 $/ozChange: 2.00
 
 
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  
 
 
Mar 26, 2004

Plasticiser allows two hours of concrete workability

Back
© 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
JOAN MARIA GARCIA GIRONA BASF’s co-creation activities for its 150th anniversary year will focus on urban living, food and smart energy challenges
Germany-based chemicals giant BASF, which celebrated its 150th anniversary last month, is using its anniversary year to collaborate with all stakeholders and expose them to sustainability practices across the value chain. BASF VP and South and sub-Saharan Africa...
The South African Nuclear Energy Corporation (Necsa) is expanding its technology portfolio of speciality gases. (Necsa subsidiary Pelchem has long been renowned for its production of fluorochemicals, including gases and acids.) Not only is the group adding production...
More
 
 
Latest News
Salani Sithole
International consulting engineering company Royal HaskoningDHV (RHDHV) has appointed Salani Sithole as South African MD, effective March 1. Sithole has been with the company for six years and, prior to joining RHDHV, held various positions in engineering consulting,...
The Gauteng Provincial Government has outlined plans to develop a handful of “mega” human settlements as part of an ambitious long-term housing development strategy aimed at narrowing the housing backlog, with plans afoot to replace informal settlements with...
Eskom power stations
While State-owned power utility Eskom was unable to cut off electricity supply to some of its neighbouring trade partners, it was able to reduce energy exports by 10% when load shedding was implemented locally. The Department of Public Enterprise explained that Eskom...
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
National flag carrier South African Airways (SAA) is in an advanced stage of renegotiating its deal with European airliner manufacturer Airbus to acquire A320 single-aisle (or narrow body) aircraft. The aim is to replace ten of the aircraft still on order with five...
Worldwide, the main thrust in the ports industry over the past decade or more has been to increase efficiency. Traditionally, ports have been run by engineers and mariners and, in the past, increasing a port’s capacity was achieved by expanding the harbour. “That has...
What do you do when an elephant has a toothache? You call Dr Gerhard Steenkamp from the University of Pretoria’s (UP’s) faculty of veterinary science, Onderstepoort, one of only two elephant ‘dentists’ in the world.
The 2015 Sanlam/Business Partners Entrepreneur of the Year (EOY) competition was launched earlier this month in Johannesburg, with the main focus on creating and inspiring entrepreneurs to create jobs and boost the economy.
In a recent letter to the editor that I sent to Engineering News (Concerns regarding South African portion of Square Kilometre Array) and in a follow-up article elaborating further (We must start preparations to build our own synchrotron light source), I stated my...
 
 
 
 
 
 
 
 
 
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