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99553 CHARACTERIZING AND EVALUATING A CONDUCTIVE EPOXY RESIN USED IN REPAIRING STRUCTURES WITH CATHODIC PROTECTION

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Product Number: 51300-99553-SG
ISBN: 99553 1999 CP
Author: Miguel Sanchez, Oladis T. de Rincon, Juan Velasquez and Elio Matheus
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When carrying out repairs to reinforced concrete structures, epoxy resins are commonly used to produce a bond between the old and new concrete. The approach is generally adequate provided that the surface is properly prepared. However, since the epoxy resin is an electrical insulator, it nullifies cathodic protection when the latter is applied to these repaired areas. This paper reports on the evaluation of a commercially available resin product which was modified to produce a good bond between the old and the new concrete, with minimum interference in the flow of cathodic protection current. To that effect, 12 cube specimens (15x15x15 cm) of old concrete adhered to new concrete by means of an epoxy resin with different concentrations of an electrically conductive material (3 samples each per concentration) were prepared. Shear - bonding and electrical resistivity tests were carried out. The effect of the conductive mixture was also evaluated by applying impressed-current cathodic protection to the samples under both dry and humid conditions. The results indicate that these mixtures increase the mechanical properties of the old/new concrete joint and also allow the application of cathodic protection to the system. The mixture prepared with 37 % of electrically conductive material showed the best pdormance. Key Words:Cathodic protection, Conductive Resin, Corrosion of Steel in Concrete, Epoxy.
When carrying out repairs to reinforced concrete structures, epoxy resins are commonly used to produce a bond between the old and new concrete. The approach is generally adequate provided that the surface is properly prepared. However, since the epoxy resin is an electrical insulator, it nullifies cathodic protection when the latter is applied to these repaired areas. This paper reports on the evaluation of a commercially available resin product which was modified to produce a good bond between the old and the new concrete, with minimum interference in the flow of cathodic protection current. To that effect, 12 cube specimens (15x15x15 cm) of old concrete adhered to new concrete by means of an epoxy resin with different concentrations of an electrically conductive material (3 samples each per concentration) were prepared. Shear - bonding and electrical resistivity tests were carried out. The effect of the conductive mixture was also evaluated by applying impressed-current cathodic protection to the samples under both dry and humid conditions. The results indicate that these mixtures increase the mechanical properties of the old/new concrete joint and also allow the application of cathodic protection to the system. The mixture prepared with 37 % of electrically conductive material showed the best pdormance. Key Words:Cathodic protection, Conductive Resin, Corrosion of Steel in Concrete, Epoxy.
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Zinc rich coatings have long been used in the protective coatings industry as one of the primary means of steel substrate protection against corrosion. The primary protection mechanism has historically been galvanic sacrificial loss of zinc metal and the simultaneous formation of protective zinc oxides and salts. Various standards and customer specifications exist to ensure that the coating will provide the necessary corrosion protection for the life of the asset.
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