The protective structure is designed to protect the live force against the impact of a shock wave and projectiles, it cannot be diagnosed by the destructive method which devalues the protective structure by sampling. The authors are looking for a combination of suitable non-destructive technology (NDT) methods that would be used in the future to prove the degree of damage to cement-based protective structures after an explosion. This article represents the first part of an experiment designed to verify the applicability of NDT methods, to evaluate the degree of damage of the protective structure in the field. The experiment consists of three parts. The first part is a laboratory verification of the initial material characteristics of the materials used. The first test set of structural elements is made of steel fiber-reinforced concrete. The elements are evaluated using NDT methods and for comparison by destructive laboratory methods. The second part is the impact of structures using explosion and evaluation of the condition of structures using NDT methods in the field. The last part is used to verify the results of the NDT method, which ensures the residual strength of the structure in the laboratory and try to find the relationship between changes in the results of NDT methods and the residual strength. Radiography was included in the introductory and concluding parts of the experiment to verify the results. Although this method is not suitable for using in-situ, it is the only standardized method of the NDT methods used.

Fortification structures, both military and civilian, are designed to resist a blast explosion to some extent. Their technical condition after a blast load must be assessed in a fast and reliable way to enable the users’ decision about the future use of the structure. Preferably, for the assessment of the protective structure, the non-destructive testing method should be used. To assess the suitability of ultrasound testing method for fortification structures built from steel fiber reinforced concrete, an investigation in a laboratory and in situ was conducted, together with numerical simulation and statistical evaluation. The numerical simulation of the blast load of a steel fiber reinforced concrete slab was conducted using multiphysics simulation software with the aim to verify basic parameters of the field experiment. During the field tests, several slabs were loaded by plastic explosive and changes in the structure of the slabs, before and after the blast load, were examined using the ultrasound pass-through method. After the field tests, the slabs were subjected to a destructive laboratory test to determine their residual strength. Subsequently, the data sets obtained from the measurements were tested using functional data analysis. The results from the ultrasound pulse method show that specimens after a dynamic blast load can in some cases increase the strength of their cement matrix.

The article discusses the promising materials suitable for critical infrastructure protection and force protection. Over the past few years, materials with a high and very high compressive strength have been tested. For the diagnostics of fault detection of tested samples before and after loading by contact explosion of plastic explosives, the non-destructive method has been used. Specifically, it was the ultrasonic impulse method.

The reliability of numerical simulations of the structural response of nonhomogeneous materials to high velocity loadings is highly dependent on the used material model and parameters. For nonhomogeneous materials, such as fibres, reinforced concrete is widely used for the Winfrith model, but the question of appropriate material parameters for Ultra-High Performance Fibre Reinforcement Concrete (UHPFRC) under high velocity loadings is still open. The article deals with possible method of inverse identification of material parameters of a UHPFRC slab under blast loading for a Winfrith material model. Possible application is in the field of numerical simulation of protective or critical infrastructure response to blast loading. Experimental measurement of the time–deflection curve through laser scanning using the triangulation method gave us input data for an inverse identification phase conducted in Optislang software. Obtained material parameters from a given range are optimized for blast loading and their Pearson’s correlation coefficient provides us information about their significance for simulation.

The article deals with military fortification constructions, their evaluation and field experimentation. Furthermore, it discusses legal standards, international and national regulations that set parameters and effects on military fortification structures. The diagnosis of structures can be characterized as a statement of differences between the assumed (projected) state and the current state of the examined structure. While field experimentation is an effect on structures and monitoring behavior and changes in the state of the structure. Considering the specific accidental actions, it is necessary to use diagnostic procedures other than conventional constructions, especially regarding the impossibility of breaking the structure by removing the specimen. It is necessary to evaluate the structure for a different type of action than usual. Some field tests were conducted at the Department of Engineer Technology according to STANG 2280. Some, however, were carried out according to their own procedure. These activities are referred to in the paper as field experiments and were used mainly to verify mathematical simulations of the behavior of actioned structures, and to make the experiments of field experiments more precise.

In this article, the methods of non-destructive testing of bored piles were considered. The purpose of the first method was to determine the length of the pile for subsequent verification with the norm. The second method was designed to control the quality of concrete piles over its entire length and is interwell ultrasonic testing. The obtained data were analyzed and corresponding conclusions were drawn on compliance with the standards.