This paper presents outcomes of the blast field tests of FRC and reinforced concrete specimens, which were performed in cooperation with the Czech Army corps and Police of the Czech Republic in the military training area Boletice. The numerical evaluation of the experiments focused on the spalling of concrete subjected to blast loading started after the first set of the tests, took almost 3 years and required further small-scale experiments performed in the labs of the Czech Technical University. This paper presents outcomes of the blast field tests of FRC and reinforced concrete specimens which were performed in cooperation with the Czech Army corps and Police of the Czech Republic in the military training area Boletice. The test were performed using real scale reinforced concrete precast slabs with varying fiber content and concrete strength class and 25kg of TNT charges placed in distance from the slab for better simulation of real in-situ conditions. The paper presents conclusions from two sets of experiments focused on the spalling of concrete subjected to blast loading and results of their numerical evaluation. The tests were performed in November 2010 and August 2011 at the military training area Boletice. The specimens were cast in Prague and had to be transported almost 200km to the location of the tests. The numerical evaluation of the tests started after the first set of the tests, took almost 3 years and required further small-scale experiments performed in the labs of the Czech Technical University. The evaluation focuses on the extent of concrete spalling of specimens subjected to blast loading.