Testing the Built Environment newsletterissue2Web 18809 1616 Page 1 Many water and waste water treatment plants areconstructed from steel reinforced concrete to a veryhigh quality standard and g ID: 233734
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Take a look atwww.Issue Date Autumn 2009 Testing the Built Environment newsletterissue2Web 18/8/09 16:16 Page 1 Many water and waste water treatment plants areconstructed from steel reinforced concrete to a veryhigh quality standard and go on to perform for manyyears with regular maintenance.There are however process treatments that by theirvery nature can cause deterioration of the concreteand if this is sufficient then the steel reinforcement canthen become at risk of corrosion.were commissioned by consulting engineers toinspect a reinforced concrete Granular Activated Carbon (GAC)filter tank on an operational water treatment works that was suffering fromspalling concrete to the inside surfaces.carried out a concrete condition survey to ascertain the nature andextent of any concrete deterioration problems and report these findings backengineers found the concrete to be suffering from visible and latentsurface damage that appeared as surface pitting with dissolution of thelimestone aggregate. This deterioration together with low cover to thereinforcement in some places caused corrosion and localised spalling of theconcrete cover.submitted the report with recommendations for reinstatement basedon EN 1504, European Standard for concrete repair, with particular emphasis consultrve.co.uk Martech Technical Services LtdChurch Street, Sawtry, HuntingdonTel: 01487 832288Fax: 01487 832739Email: Most fire damaged reinforced concreterepaired but before any repairs are carriedout it is necessary to carry out a thoroughthe damage caused by the heat of the fireon both the concrete and the reinforcingstructural integrity of the reinforcedconcrete has not been over stressedduring the fire and in these circumstancesexperience in this field and can recognisethe tell tale signs of fire damagedconcrete. A visual inspection together withcutting out of the fire damaged areasdetailed report about the schedule ofdamage and suitable repair solutions. are very experienced in thisarea of work and well aware of theeffects chlorine treated water has onsteel reinforced concrete, havinginspected many such structures.recentlypart of a popular leisure complex in theWest Midlands, to asses the nature andextent of concreteof reinforcementcorrosion.tested the exposed concretestructure from the basement and foundthe pool to be suffering from chloridecontamination of the concrete inpenetrated to the reinforcement andconcrete.report to the client with advice forconcrete repair to EN 1504 standardselectrochemical cathodic protectionsystem to provide long term durability tothe structure. Testing went Swimmingly involving chemistry, safety, public relations and building maintenance. Looking after thestructure of municipal swimming pools often involves the routine inspection of thereinforced concrete used in the original construction. newsletterissue2Web 18/8/09 16:16 Page 4