Reinforcement of Concrete with Glass Multifilament Yarns: Effect of the Impregnation on the Yarn Pull-Out Behaviour

Abstract

The impregnation of the yarn by the cementitious matrix is a key parameter to predict the mechanical behaviour of textile reinforced concrete. The mechanism of this impregnation is specific because of the heterogeneous nature of both materials. Since there is no method to observe and quantify this impregnation, all the models defined to describe the mechanical failure of this type of composite are based on statistics and incomplete observations. To adjust those models to the experimental results and to understand the influence of the matrix on the impregnation, several pull-out tests were performed on samples composed of a glass multifilament yarn and several matrices. After pull-out test, some samples were impregnated with resin in a three steps process that includes cementitious matrix dissolution and enable to visualize the remaining filaments and to assess their impregnation degree by the cementitious matrix.