The crack bridging ability (CBA) of two commercial coatings based on polyurethane resins was studied as specified in the European Standard EN test method. The test pieces of concrete blocks were used for the CBA evaluation at room temperature and the roughness index of the substrate was not measured. The results show that CBA resulted at lower values of displacement in the first coating than in the second one, the CBA values between 0.8 mm and 2.4 mm were observed. The results obtained at low temperature of 269 K show hat the mechanical response of the coating differs at ambient temperature as the low temperature causes the material to harden. The CBA values ranged between 0.42mm and 0.66 mm for the test performed at ambient temperature, and between 0.52 mm and 0.55 mm for the low temperature tests.
The importance of adhesion control in crack-bridging measurements
Delucchi M.;Ricotti R.;Cerisola G.
2008-01-01
Abstract
The crack bridging ability (CBA) of two commercial coatings based on polyurethane resins was studied as specified in the European Standard EN test method. The test pieces of concrete blocks were used for the CBA evaluation at room temperature and the roughness index of the substrate was not measured. The results show that CBA resulted at lower values of displacement in the first coating than in the second one, the CBA values between 0.8 mm and 2.4 mm were observed. The results obtained at low temperature of 269 K show hat the mechanical response of the coating differs at ambient temperature as the low temperature causes the material to harden. The CBA values ranged between 0.42mm and 0.66 mm for the test performed at ambient temperature, and between 0.52 mm and 0.55 mm for the low temperature tests.
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