Chloride threshold values
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1 Chloride threshold values Meeting with the reference group 12 October 2011 Test methods Potentiostatic method (fixed potential) Free potential method (open circuit) RRT with RILEM TC 235 CTC method 1
2 Potentiostatic method Test setup Potentiostat Counter electrode of MMO titanium mesh 6% NaCl solution Reinforcement Zinc electrode Potentiostatic method Treatment of reinforcement bars: Pre-rusted Citric acid, then repassivated in Ca(OH) 2 solution Potentials representing typical values for: Seawater splash zone (100mV CSE) Submerged seawater zone (-150mV CSE) 2
3 Potentiostatic method Potentiostat Concrete specimens with rebars and epoxy coating Free potential method Test setup High impedance datalogger 6% NaCl solution Reinforcement Zinc electrode 3
4 Free potential method Concrete specimens with rebars and epoxy coating Datalogger Concrete mix design Powder: Rapid cement (75%) and fly ash (25%) Eqv. w/c = 0.45 (w/b = 0.40) Aggregate: Granitic (D max = 8 mm) No additives in order to know the exact chemistry of the cement paste Target slump: mm 4
5 Final mix design Material Density [kg/m 3 ] SSD [liter/m 3 ] Rapid cement Fly ash Rønne 0/2 mm Rønne 4/8 mm Water Air 15 Total Eqv. w/c 0.45 Slump flow 110 mm Concrete mixing Concrete mixing station 5
6 Casting Cutting 150 mm 150 mm Diamond saw cutting lines To ensure uni-directional ingress: All surfaces are sealed with epoxy, except the ones to be exposed. 6
7 Cutting Cover depths 5 mm 15 mm Cover depth Sample ID and test methods 75% Rapid cement + 25% fly ash, eqv. w/c =0.45 Preliminary test no 1 75% RPC + 25% FA, w/c =0.45 Casting date Exposure date Method Sample ID Free Fixed pot. Fixed pot. potential 100 mv -150 mv Cover depth Channel no. S1F/5/1+3 x Citric acid S1F/5/2+4 x Rusted S1F/5/5+7 x Citric acid S1F/5/6+8 x Rusted S1F/15/1+3 x Citric acid S1F/15/2+4 x Rusted S1F/15/5+7 x Citric acid S1F/15/6+8 x Rusted S1P100/5/1+3 x Citric acid S1P100/5/2+4 x Rusted S1P100/5/5+7 x Citric acid S1P100/5/6+8 x Rusted S1P-150/5/1+3 x Citric acid S1P-150/5/2+4 x Rusted S1P-150/5/5+7 x Citric acid S1P-150/5/6+8 x Rusted Rebar Date of corrosion treatment initiation Meeting with the reference group of the Expertcentre, Danish Technological Institute, October 12,
8 Free potential method Corrosion on-set will be detected by significant change in potential No indication of corrosion after 5 months of exposure. Free potential method 8
9 Potentiostatic method Corrosion on-set will be detected by significant increase in current No indications of corrosion observed after 4 months of exposure Fixed potential (-150 mv vs. CSE) Example of measurements Chloride profile sampling Sampling procedure 9
10 Test of chloride ingress No indications of corrosion onset after about 5 months Test of chloride ingress: test of chloride ingress with 0.1 M AgNO 3 solution (spray-test) two chloride profiles (profile grinding and titration) Specimen from free potential setup with 15 mm cover depth Test of chloride ingress AgNO 3 solution 10
11 Chloride profile sampling Cover depth: 15 mm Sampling volume Side view Front view Chloride profile sampling 0 to 5 mm: Sampling in 1 mm intervals 5 to 15 mm: Sampling in 2 mm intervals 11
12 Chloride profiles After 153 days of exposure in 6% NaCl solution (at 20 C) 12
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Irish Concrete Society Platin, Drogheda, Co. Louth. Tel: 041 987 6000 Fax: 041 987 6400 www.concrete.ie
Irish Concrete Society Platin, Drogheda, Co. Louth. Tel: 041 987 6000 Fax: 041 987 6400 www.concrete.ie Irish Concrete Federation Unit 8, Newlands Business Park, Newlands Cross, Clondalkin, Dublin 24.