Articles
Companies

Home / ANALYSIS / Concrete technologies


Concrete technologies

by CW Staff on Dec 6, 2010




What are the latest developments in concrete and how can these boost project sustainability? Construction Week investigates.

Much used as a primary building material throughout the Middle East, the pros and cons of concrete are being increasingly scrutinised as the construction industry looks to the future. Ensuring this essential material can meet new demands for both structural engineering and sustainability is vital to its future use in the region.

Well aware of the need to remain competitive with alternative building products, concrete producers and suppliers are developing new mixes and products. But as well as changes to how the product is actually used in the construction industry, improvements are also being made to its production and material make-up. One of the latest changes is the use of recycled materials in concrete.

“A trend in concrete production is the replacement of cement with ground granulated blast furnace slag (GGBS), which is a by-product of the steel industry, or pulverised fly ash (PFA), which is the by-product of the thermal power plants that use coal for burning in the turbines,” reports a Lootah Group spokesperson. “The replacement levels can be up to 70% in the case of GGBS and 30% in the case of PFA; this minimises the use of cement, which is the major contributor in carbon pollution.”

This method is now being applied worldwide in an effort to reduce cement production, hence the associated carbon dioxide emissions. With the worldwide production of cement estimated to contribute 5-8% of global carbon dioxide emissions, finding replacement materials has been seen as of significant importance in the industry.

In addition to improving the carbon footprint of the final concrete product, the use of GGBS and PFA has provided further benefits: they are normally cheaper than cement and their properties can improve the quality of the concrete product.

“The usage of these materials has enhanced the strength and durability parameters and improved the quality of concrete,” reports the Lootah Group spokesperson. “It also reduces the heat of hydration, that is the heat evolved during the reaction between cement and water,” the spokesperson adds.

In addition to meeting worldwide demands for improved environmental attributes, the changes are being introduced to meet consultant specifications for the durability parameters of concrete and to reduce the heat of hydration in concrete in deep foundations.

Some changes have been necessary to enable the use of the new materials, being facilitated by concrete producers.


FEATURED COMMENT

would like to know about 1. Pre cast Concrete insulated sandwich panels 2. Plastic concrete

  4 Comments


Readers' Comments


Ruhi Nasim (Nov 30, 2011) United Arab Emirates

Concrete
would like to know about 1. Pre cast Concrete insulated sandwich panels 2. Plastic concrete

DR MOHAMMED ALHAJ (Dec 7, 2010)
TAMPA
USA

Concrete technologies- THE IMPORTED POZZOLANS TO MIDDLE EAST WILL INCREASE CARBON FOOT PRINT
I disagree on first statement and agree on the second statement - 1- In addition to improving the carbon footprint of the final concrete product, The imported pozzolana will increase carbon foot print for our countries in the Middle East because the imported pozzolana from west or east will increase the consumption of fuel during the shipping of these pozzolans. MASDAR, UAE HAD STATED IN THEIR WEB SITE THAT THE USING OF IMPOORTED FLY ASH FROM INDIA OR GGBS FROM JAPAN OR UK IN UAE PROJECTS WILL PRODUCE 155-200KG OF CO EMISSION FOR EVERY TONS OF POZZOLAN USED IN THE PROJECT. whilst THE USE OF VOLCANIC ASH FROM SAUDI ARABIA AS NATURAL POZZOLANA ASTM 6 TYPE N, WILL REDUCE THE CARBON FOOT PRINT FOR THE POZZOLAN USED IN THE G.C.C. THE DISTANCE BETWEEN THE VOLCANIC ASH IN SAUDI, YEMEN, SYRIA AND JORDAN IS AROUND 800 MILES NOT 4000-10000 MILES FOR THE IMPORTED POZZOLAN. Another disadvantage for the imported pozzolan is the price and the shipping cost, since the the sale price of 1 ton of imported pozzolan will be 80% more than 1 ton of local IP ASTM -C595 CEMENT IN SAUDI ARABIA. I agree totally on the next statement. 2- the use of GGBS and PFA has provided further benefits: they are normally cheaper than cement and their properties can improve the quality of the concrete product.

dinesh patel (Dec 6, 2010)
Pre cast Concrete insulated sandwich panels
where can I get more information on the design and fabrication methods.

Dinesh Patel (Dec 6, 2010)
Plastic Concrete
Would like to know more about this technology and how this type of concrete is made and how it is formed.


COMMENTS

Name *
Email *
City
Country
Subject: *
Comments: *
Math Question: *
Solve this simple math problem
and enter the result. E.g. for 1+3, enter 4.
Refresh the image if not clear
Remember me on this computer






Articles
Companies