Estudo da aderência entre concreto e argamassas industriais e compósitos cimentícios reforçados com fibras: avaliação em diferentes idades e do uso de ponte de aderência

Abstract

Repair and structural reinforcement are increasingly present in the daily life of civil construction companies. This occurs due to the aging of buildings, lack of maintenance, early deterioration, in addition to the need to adapt the existing structures to new uses. In order for the repair and reinforcement to guarantee the integrity and durability of the structures, some aspects must be attended to. The correct identification of the causes of the damage will lead to the definition of the ideal solution for each case, the application of good technique, namely with regard to cutting the deteriorated materials, cleaning the substrate and the perfect connection between the new material and the material to be used for repair are critical to the success of the job. In this regard, the guarantee of the adhesion of the connection is a fundamental factor for the performance of a good job. Thus, the objective of this dissertation is to verify the bond strength between concrete and seven types of mortar, four types of industrial mortars and three types of mortars developed in the laboratory, evaluating the efficiency of adhesion bridge and the influence of the aging process. Comparative analyses of these parameters were carried out with each other, with the results of other researchers and with normative limits. Two types of tests were carried out: slant shear test, according to the British standard and insert pull-off test, according to Brazilian and European standards. After the analyses, it was found that the use of adhesion bridge and the aging of the materials translate an increase in the adhesion resistance of the repair.