Product category:
Concrete, Cement, Admixtures
News Release from: RMC | Subject: Rugby Cement and Fly Ash
Edited by the Buildingtalk Editorial
Team on 17 January 2005
RMC cement and fly ash for unique CTRL
concrete
RMC has supplied 40,000 tonnes of Rugby Cement and 40,000 tonnes of Fly Ash for track beds, walkways and precast concrete tunnel lining segments for the Channel Tunnel Rail Link London Tunnels.
RMC's UK Cement Division has supplied 40,000 tonnes of Rugby Cement and 40,000 tonnes of Fly Ash for track beds, walkways and precast concrete tunnel lining segments for the Channel Tunnel Rail Link London Tunnels The tunnels are the two 10-kilometre long London Tunnels East which connect Dagenham with Stratford, and the two 7.5-kilometre London Tunnels West from Stratford to the King's Cross Lands north of St Pancras
This article was originally published on Buildingtalk on 27 Sep 2004 at 8.00am (UK)
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According to the contractor for London Tunnels West, Nishimatsu-Cementation Skanska Joint Venture (NCS JV), there were a number of concreting challenges that had to be overcome.
NCS JV ENT, Bill Brundan, explained: "We had to customise the concrete plant machinery to accommodate the alignment of the tunnels and the varying cants occurring in the tunnels".
" We also worked closely with RMC's UK Cement Division to achieve a mix design for the up to 1".
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"4-metre high walkways that would make them stand up immediately without the need for temporary support." After numerous trials, an innovative solution was achieved: "We came up with a very dry mix design utilising certificated Fly Ash (EN450) to make the concrete cohesive".
" The Fly Ash is a by-product from coal-fired power stations that is processed and used as a cement replacement to provide improved water reduction and better long-term strength performance".
" Fly Ash has the ability to help control the set of the concrete, which is especially beneficial in slipform concreting," said UK Cement Division commercial director, Gareth Moores.
The resulting concrete could instantly be moulded to the required walkway shape by the slipform paving machine.
The walkways immediately stood erect without subsiding, even when weight was applied.
A tight, high-standard, blemish free surface finish was also achieved due to the rounded shape of ash particles.
Over the last three years, RMC's UK Cement Division has supplied more than 40,000 tonnes of cement and 120,000 tonnes of Fly Ash (Part 1 and EN450) to many of the Channel Tunnel Rail Link contractors including, NCS JV, Hochtief/Murphy, Nuttall/Hanson, Malling Holzman and Costain/Skanska/Bachy Soletanche.
RMC Precast Products has also produced a total of 86 miles, or 275,000 units, for troughing, lids and accessories for vital signalling and communications alongside the Channel Tunnel Rail Link tracks, and recently supplied Costain/Skanska/Bachy with 400 tonnes worth of bespoke precast wall and roof segments for Stratford Box.
This contract included 25 rectilinear wall panels and 38 profiled roof panels.
Following the design and engineering of unique segment moulds, the casting was completed at Bishop Auckland, County Durham over a 10-week period.
A concrete portal in each of the segments allows air to void the structure and reduce noise for passengers.
Section 2 of the Channel Tunnel Rail Link, from north Kent to St Pancras Station in London, is due to be completed in 2007.
Section 1 from the Channel Tunnel to Fawkham Junction in north Kent opened in September 2003.
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