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Lafarge Tarmac low carbon cement boosts power station’s green credentials

World Cement,

A new 2160 MW natural gas power station in Pembroke boosted its green credentials during the construction phase through the use of low carbon Phoenix Portland flyash cement (BS EN 197-1 CEM II/B-V 42,5N) produced just 90 miles away and incorporating flyash from its sister power station.


The plant’s operator, RWE Npower, worked closely with Aberthaw-based CelticAsh and Lafarge Tarmac’s East Aberthaw cement plant during the power plant’s construction phase to overcome a number of tricky technical challenges, whilst saving around a quarter of the normal CO2 emissions associated with cement manufacture.


Allan Everett, general manager of CelticAsh, said the Pembroke power plant was in the almost unique 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 raw materials 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.”


Lafarge Tarmac met the challenge of a lack of readymix sites nearby by building a state-of-the-art 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.


Pembroke Power Station is one of the most efficient in Europe, and 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. 22 500 tonnes of Phoenix Portland fly-ash cement were used, incorporating 7000 tonnes of CelticAsh flyash.

Adapted from press release by Jack Davidson.

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