Low carbon cement for Pembroke power station
The new 2,160MW natural gas power station in Pembroke boosted its green credentials during the construction phase through the use of low-carbon Phoenix Portland fly-ash cement produced just 90 miles away using fly-ash from its sister power station.
Operator RWE npower worked closely with Aberthaw-based CelticAsh and Lafarge Tarmac’s cement works at East Aberthaw during the plant’s construction phase to overcome a number of tricky technical challenges, while saving around a quarter of the normal CO2 emissions associated with making the cement.
Allan Everett, general manager of CelticAsh, said Pembroke was in the rare position of being able to use high quality ash from its sister power station to replace around a quarter of the clinker in the cement to meet its structural concrete requirements and the need for good long-term durability.
“The use of such local ‘ingredients’ effectively produced a special low-carbon Welsh cement,” he said. “Each of the five turbine halls was poured in a single session lasting 10 hours. The ash content of the cement (typically around 30%) significantly reduces its heat of hydration, which in turn reduces the risk of thermal cracking in large concrete pours.”
He said that Lafarge Tarmac [as the company is now called] met the challenge of a lack of readymix sites nearby by building a mobile concrete plant especially for the project. “This was set up on location at Pembroke to reduce the number of vehicles needed, whilst lowering CO2 emissions further – more wins for the environment.”
Pembroke Power Station is supplied by natural gas through a new pipeline that runs deep under Milford Haven and connects the power station to the National Grid’s National Gas Transmission System. Some 22,500 tonnes of Phoenix Portland fly-ash cement was used, incorporating 7,000 tonnes of CelticAsh fly-ash.
- Click here to return to the previous page
- Subscribe to our free construction newsletters
- Buy & Sell Construction Plant Machinery online with TCiTrader.co.uk. Find new, used & reconditioned Construction Equipment. Click here to view Construction Equipment Classifieds.
- UK Construction Week: 9 major shows under one roof with 55,000 trade visitors and 1,000 exhibitors (6-8 October 2015 | NEC) - Register for FREE here
Download our free construction news iPhone / iPad app. Sign up to our FREE email newsletters or subscribe to our RSS feed for regular updates on the latest Construction News, Plant News, Contract News & Supplier News. The Construction Index also provides the latest Construction Tenders, Construction Market Data & Construction Law Commentary all FREE.
This article was published on 15 Jan 2013 (last updated on 15 Jan 2013).