Evaluation of Crack Repair Materials by Means of Bending Test on Notched Concrete Specimen

Abstract

Restoration of strength properties of crack repaired concrete specimen has been studied ． Three − point bend tests were carried out on undamaged notched concrete specirnens and damaged ones which crack repaired by epoxy resin ， a 冂 d restoration of the specimen was evaluated by means o 正 fracture mechanics parameters such as the fracture energy G ， and the bending strength ． The bend − ing strength of repaired concrete specimen was proportional to the E − modu 且 us of resin ， and in− versely proport孟 onal to the width of crack ． The fracture energy ( G．)of repaired concrete speci − mens decreased with increasing the E ・ modulus of resin ． The GF value of repaired concrete were dld not monotonously increase with increasing compressive strength of concrete ， and had a tendency of decrease at low water cement ratio．