ABSTRACT
This chapter describes the results and the implications for the design recommendations. During grouting of absorptive stone material, a significant amount of water is extracted from the suspension through the borehole surface. Supplementary injection anchors are used as a repairing-system inside masonry for transferring tensile-forces that cannot be transmitted by the masonry itself or for new connections. The effect of water absorption will increase the compressive strength of the grout plug, if the absorbed water is replaced with sufficient grout. If a high amount of water is absorbed in a shorter time, then the absorbed volume of water will be replaced with grout even at shorter grouting time. The bond behaviour of grouted injection anchors inside water absorptive stone material has been investigated with 50 pull-out tests in laboratory. The tests are enhancing the results of a current database of 650 pull-put tests in laboratory and in situ.
