In situ pull-out tests of steel and GFRP injected anchors in masonry walls

This paper presents the results of experimental in situ pull-out tests of injected anchors embedded in existing masonry walls made of yellow tuff. Anchors made of steel and GFRP bars of 20 mm in diameter were embedded in the masonry using two types of grout: a cement-based and a pozzolanabased grout. The experimental results were examined in terms of both maximum load and displacement to determine the most efficient bar-grout coupling. The experimental results were also compared with theoretical pull-out forces given by some standard code and literature strength models.