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File Ivo �" r-- Project <br /> Subject METHOD FrR ESTiMATINC THE TIME TO CORROSION <br /> OF r 11_ ORCED CONCRETE SUBSTRUCTURES <br /> BY -- <br /> Rev?ewea By fti ; Date v <br /> H'�0 H2O Specimen Specimen H2p <br /> Kohms ph Kohms ph ML - OHM/Factor <br /> Low <br /> 2 r <br /> 3 I I E <br /> 4 <br /> 5 <br /> 7 <br /> 8 I I <br /> 9 I - <br /> 10 I I <br /> Average Min Resistivity ohrns= 2- J <br /> *tor = t (,-5`t C,-,-)at min Resistivity= -7, Co- Results in years <br /> Range of meter at min Resistivity=x, <br /> 50 �'-- <br /> x <br /> W pH OF ENVIRONMENT NORMALLY <br /> J GREATER THAN 73 <br /> 0 40 YEARS = 147 RG 4; <br /> W R = MINIMUM RESISTIVITY <br /> W pH OF ENVIRONMENT NORMALLY <br /> Cf) LESS THAN 73 0 <br /> W *YEARS=13,79[L.oq,OR-Log 10(2160-2490 Loglo pH)]—) Ib5 <br /> (� <br /> Q THICKNESS-[N 00521006410079101091013810 1681 <br /> (D GAGE 18 16 1 14 1 12 10 1 8 I 6 0000 <br /> FACTOR 1 0 1 1 6 2 2 28 �]0 <br /> I <br /> Z fl <br /> 1 � <br /> 0 20 MULTIPLY YEARS TO PERFORATION 1 �� <br /> I-_ BY FACTOR FOR THE VARIOUS <br /> METAL GAGES <br /> 0 254 (Thickness-tn) Thickness-mm <br /> LL_ { <br /> Q <br /> W O I I I I I i 1 I I <br /> 10 100 €040 10,000 100,000 <br />