Application of Wedge Splitting Test for Evaluation of the Bond Strength in Repair System Alumina Cement Concrete Vs. PCC Mortar

摘要

There are several key factors, which are considered, when selecting methods and systems for concrete repair. Good bonding between repair material and concrete substrate is a crucial and simultaneously complex phenomenon. This paper shortly presents methods used for the bond strength evaluation with different ways of loading of bonded joints. A systems consisting of high performance concrete substrate and two types of repair materials are investigated. The main goal of the work is to compare a polymer-cement modified mortar (PCC) and a rapidly setting repair concrete (based on alumina cement). Technical characteristic of the materials as well as their bond strength to concrete substrate are presented. Surface of concrete substrate is prepared by using different roughening techniques commonly applicable on site. Bond strength is measured by standard pull-of test and by the wedge splitting test (WST). WST test adaptation for that purpose allows to extend the description of adhesion using fracture mechanics parameters such a work of adhesion and fracture energy.