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Technical Dayta Sheet Compedium

CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING JOINT FILLERS WATERPROOFING WATERSTOPS ROOFING TIMBER FLOORING ALPHABETICAL INDEX Specification Where indicated, cathodic protection to reinforced concrete elements shall be provided by Ebonex discrete composite anodes capable of maintaining long term stability at current densities of up to 900 mA/m² (of anode surface). The Ebonex discrete anodes shall be gas vented and are fixed in place using Ebofix grout, a thixotropic high density, electrochemically compatible grout. All design, fixing and installation shall be carried out by specialists experienced in the field of cathodic protection, approved by the anode system supplier. Instructions For Use Preparation Ebonex discrete anodes are installed in pre-drilled holes 4 - 8 mm larger than the nominal Ebonex discrete anode diameter and typically no further than 600 mm apart (unless otherwise approved by the Engineer). The holes and Ebonex discrete anodes should be located to minimise their proximity to the steel reinforcement in order to provide an even current distribution to the steel within the local vicinity. Cut a chase with a minimum depth of 20 mm and a width of 8 mm into the concrete between the holes. This chase is used to accommodate the titanium feeder wire, interconnecting the Ebonex anodes, and any gas discharge piping. A 3 mm saw cut can be used if the venting pipes are not interconnected. Prior to application the holes and chases should be blown or vacuum cleaned of all debris and pre-soaked with water. Mixing Ebofix grout should be mixed with a slow speed drill (400/500rpm) and Renderoc paddle. Place between 3.0 - 4.0 litres of drinking water, depending on required consistency, into a suitable mixing container and add one full 10 kg bag of Ebofix grout and mix for three minutes until fully homogeneous. Installation Remaining water should be removed from the hole and the Ebofix grout injected by hand pump to the rear of the hole to avoid air entrapment, ensuring sufficient is placed to cover the entire length of the active Ebonex discrete anode. The thixotropic nature of Ebofix grout will prevent significant flow from vertical and overhead holes. Wet each Ebonex anode with clean water, but do not immerse for more than 10 seconds, before gently inserting into the hole. Ensure the vent pipe is unobstructed and that sufficient tail wire remains exposed to enable connection with the feeder wire. Place the Ebofix grout within 30 minutes of mixing to gain benefit of the expansion system and allow to cure for a minimum of 24 hours, without physical disturbance. When cured the open end of the gas vent network can be directed to a well-ventilated location. It is not recommended that the feeder wire be run within the vent tubing of the Ebonex anode. Connect strings of Ebonex discrete anodes together as recommended by the CP design engineer using non-coated titanium feeder wire. All wire jointing requires the use of titanium metal crimps, secured using the appropriate Fosroc crimping tool. After connections have been made continuity should be tested with a resistance meter. Any found to have a resistance >1 Ohm requires re-crimping. When the integrity of the connection is established the tail of each Ebonex discrete anode can be gently bent, thus settling the wire into the chased groove. The chase is filled with a pre-bagged repair mortar or Ebofix grout and left for at least 4 days before connecting to the power system. Limitations In chloride contaminated structures, particular attention should be paid to the control of driving voltage of systems, which should not result in potentials greater than 7V being applied to the titanium connecting wires. For further information consult your local Parchem office. Performance of the Ebonex discrete anode is dependent upon the correct design, installation and maintenance of the Cathodic Protection system. Page 2 97 Ebonex


Technical Dayta Sheet Compedium
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