Product category:
Waterproofing, Sealants and Adhesives
News Release from: Sika | Subject: SikaCem 133 Gunite
Edited by the Buildingtalk Editorial
Team on 17 May 2006
Sika Sprayed Concrete used on bridge
restoration
SikaCem 133 Gunite, a cement based dry sprayed repair mortar, was recently used on the refurbishment of Nettlehill Railway Bridge on the busy A899 in Livingston.
Sika Sprayed Concrete Used on Nettlehill Bridge Restoration SikaCem 133 Gunite, a cement based dry sprayed repair mortar, was recently used on the refurbishment of Nettlehill Railway Bridge on the busy A899 in Livingston The two span, twin deck structure was built in 1967 by the Livingston Corporation, with a design of pre-stressed concrete beams, simply supported on reinforced concrete abutments and piers
This article was originally published on Buildingtalk on 8 Sep 2003 at 8.00am (UK)
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Failed deck joints had allowed road salts to penetrate into the structure, leading to extensive corrosion of the reinforcing steel, which in turn caused delamination on the abutments and piers.
Deeply embedded chlorides were also found.
Following repair of the joints in a previous contract, consultants URS from Glasgow, in consultation with West Lothian Council, decided upon a mesh overlay Cathodic Protection system as the most cost effective solution to the problem, whilst ensuring the long-term integrity of the bridge.
Cathodic Protection is an effective method for protecting reinforcing steel from chloride-induced corrosion, and the future condition of the bridge can be constantly monitored from a remote location.
Following repairs and installation of the CP system by main contractors Freyssinet, SikaCem 133 Gunite was applied by specialist contractors Quickseal , to overlay and embed the titanium mesh Cathodic Protection system.
CP system design was undertaken by Freyssinet subsidary, Corrosion Control Services Limited.
SikaCem 133 was chosen because of its compliance with the design of the CP system regarding conductivity and insitu performance, and its ease of application over large areas.
It is a one part system, can be applied both vertically and overhead, and has rapid strength gain with low shrinkage, making it ideal for a variety of structural repair and cathodic protection projects such as car parks, bridges, tunnels, dams and marine structures.
Although SikaCem 133 Gunite can be finished to a high standard ready to take Sika re-profiling mortars and protective coatigs, it can also be left, as in this application with a sprayed finish.
The repaired structure has already been tested by vandals lighting a fire against it, and has stood up to the test extremely well!.
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