The paper is focused on the examination of the internal quality of joints created in a multi-material additive manufacturing process. The main part of the work focuses on experimental production and non-destructive testing of restrained joints of modified PLA (polylactic acid) and ABS (Acrylonitrile butadiene styrene) three-dimensional (3D)-printed on RepRap 3D device that works on the “open source” principle. The article presents the outcomes of a non-destructive materials test in the form of the data from the Laser Amplified Ultrasonography, microscopic observations of the joints area and tensile tests of the specially designed samples. The samples with designed joints were additively manufactured of two materials: Specially blended PLA (Market name—PLA Tough) and conventionally made ABS. The tests are mainly focused on the determination of the quality of material connection in the joints area. Based on the results obtained, the samples made of two materials were compared in the end to establish which produced material joint is stronger and have a lower amount of defects.

The article deals with an innovative method designed to check project documentation of buildings at the design stage, specifically exploring the possibility to implement FMEA and PDCA methodologies. Based on performed measurements and data collection, it theoretically determines the riskiest areas of the project documentation, which should be given special attention in order to reduce later costs for construction companies to fix the reported complaints. The research proves that the application of the FMEA and PDCA methodology can be very useful regarding the elimination of defects in the project documentation of constructions already in the phase of construction preparation.

In this article, an innovative new method of non-destructive testing for estimating the sensitivity of limestone is presented. An advantage of the laser ultrasonic structuroscopy method is the time and the quality, due to which less tests are necessary for an analysis of rock properties. Limestone is measured with an innovative structural control method, which shows a good qualitative and quantitative agreement with the basic structural analysis.

The presented research contains a description of a non-destructive laser ultrasound internal structure analysis of aluminium joints made by friction stir welding. In the research, four selected technological parameter groups were taken into account. Modifications used in different parameter groups included changing tool traverse speeds and also its rotation speeds. The most important goal of this research was to determine the joint quality using a non-destructive laser amplified ultrasound method  To verify obtained test results, an additional microstructural analysis was also conducted.

The present paper deals with pollutants in the building’s indoor environment and possibilities of their elimination, carbon dioxide (CAS 124-38-9), further from volatile organic compounds were investigated trichlorethylene (CAS 79-01-6), toluene (CAS 108-88-3) and benzene (CAS 71-43-2). A new experimental method for effectively reducing the concentration of pollutants in the indoor environment of buildings is presented, which is based on the placement of plants into the research area and has the potential to bring operating costs savings in the field of building ventilation. The issue is closely related to the increasing requirements for the healthiness of the indoor environment of building. Quality of the indoor environment is also assessed according to the quality of indoor air. Increased concentrations of pollutants in the indoor environment can have a negative impact on the human health for the building’s users. In the paper, the modelling of indoor ventilation is shown, where one model case examines the theoretical quantity requirement of ventilated indoor air without plants and the other model case examines the requirement for the amount of ventilated air in plant environment. For both models cases the same final value of pollutant concentrations was required. After the computational modelling, the results were compared to determine the percentage difference of the supply air demand. Based on the computational model, it was shown that selected plants can favourably influence the pollutant concentration in the indoor environment. The model environment for research was determined as an office area, initial concentrations of pollutants were determined before the arrival of persons, also was determined the constant production of pollutants during working hours, and reduction of pollutants by plants This is a completely new perspective on the issues of building ventilation and improving the quality of the indoor environment, and according to the achieved calculation, the costs of building operations on a global scale can be significantly reduced.