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

Abstract

abstractEN: There are several key factors, which are considered, when selecting methods and systemsfor concrete repair. Good bonding between repair material and concrete substrate is a crucial andsimultaneously complex phenomenon. This paper shortly presents methods used for the bondstrength evaluation with different ways of loading of bonded joints. A systems consisting of highperformance concrete substrate and two types of repair materials are investigated. The main goal ofthe work is to compare a polymer-cement modified mortar (PCC) and a rapidly setting repairconcrete (based on alumina cement). Technical characteristic of the materials as well as their bondstrength to concrete substrate are presented. Surface of concrete substrate is prepared by usingdifferent roughening techniques commonly applicable on site. Bond strength is measured bystandard pull-of test and by the wedge splitting test (WST). WST test adaptation for that purposeallows to extend the description of adhesion using fracture mechanics parameters such a work ofadhesion and fracture energyscore: 7collation: 401-40