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The article brings outputs of laboratory tests that have been conducted on physical model of embedded bolt on a model scale 1:1. The Physical model consists of a cylindrical concrete block of a diameter of 150 mm that a thick-wall cylindrical steel sleeve envelopes. The unconfined compressive strength of concrete block is 70 MPa and modulus of elasticity 25 GPa. The bolt rod is grouted in the borehole of a diameter 34 mm drilled in the cylinder block center. The tests have been carried out for steel ribbed rod of diameter 24/27 mm cemented in the borehole with fly ash and cement mortar respectively. The lengths of the rod bolt abutment are 150, 300 to 450 mm. On prepared models of grouted steel bolt abutment there was done pull-out test to record the tensile pull-out force at bolt head and the displacements at two points of the bolt rod on start and end of the abutment section. Another output of the test on the physical model clarifies the causes and documents the abutment failure for both mortar materials. The both examined mortar materials show different behavior with regard to both scrutinized phenomena pull-out test curves and mode of abutment failure. Outputs are documented on graph for pull-out test and photos for the abutment failures. From the pull-out test record for the surveyed abutment lengths and both mortar materials are extracted the maximum tensile forces at abutment failure and next set up dependency for the maximum strength on the length. [ABSTRACT FROM AUTHOR]