The article presents briefly several methods of working time estimation. However, three methods of task duration assessment have been selected to investigate working time in a real construction project using the data collected from observing workers laying terrazzo flooring in staircases. The first estimation has been done by calculating a normal and a triangular function. The next method, which is the focus of greatest attention here, is PERT. The article presents a way to standardize the results and the procedure algorithm allowing determination of the characteristic values for the method. Times to perform every singular component sub-task as well as the whole task have been defined for the collected data with the reliability level of 85%. The completion time of the same works has also been calculated with the use of the KNR. The obtained result is much higher than the actual time needed for execution of the task calculated with the use of the previous method. The authors argue that PERT is the best method of all three, because it takes into account the randomness of the entire task duration and it can be based on the actual execution time known from research.

The aim of this study is to build a mathematical model of the productivity of construction workers. It does so by selecting 17 factors that influence the productivity of construction workers and categorising them into five groups. For the mathematical description of the factors, fuzzy logic was used. A formula for calculating the work productivity of construction workers is proposed. The novelty of the approach proposed by the authors is rooted in the consideration of various factors that have the potential to influence the productivity of construction workers. To present the way the formula operates, a single assessment of ceiling formwork was undertaken. The verification of a model confirmed its capability of analyzing, evaluating, and predicting the productivity of construction workers with satisfying accuracy.

The paper presents an algorithm that allows to calculate the potential productivity of construction workers, including the factors that influence them. Its development involves one of the classifications of factors. In the next step, the elements of fuzzy logic were used for the parameterization of factors. Subsequently, a survey was applied to specify the gradation of individual factors with regard to their impact on productivity. The paper as a whole presents a mathematical algorithm, the practical application of which was presented too.Keywords: algorithm, labour productivity, construction workers Streszczenie Artykuł przedstawia algorytm pozwalający na obliczenie potencjalnej wydajności pracy robotników budowlanych uwzględniający czynniki na nich oddziałujące. Do jego budowy wykorzystana została jedna z klasyfikacji czynników. W kolejnym etapie przedstawiono sposób wykorzystania elementów logiki rozmytej do parametryzacji czynników. Następny krok polegał na wykorzystaniu badań ankietowych do określenia gradacji poszczególnych czynników pod kątem ich stopnia wpływu na wydajność. Całość publikacji prowadzi do zaprezentowania matematycznego algorytmu, którego możliwości zastosowania w praktyce również zostały przedstawione.Słowa kluczowe: algorytm, wydajność pracy, robotnicy budowlani

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In the article, the modern and innovative applications of concrete mix have been critically analyzed. The authors focused first of all on transparent concrete - LiTraCon. The article mainly analyzed its technical parameters. Another modern way of using the concrete mix, which has been included in the publication, is paving stone absorbed in daylight. This material description is primarily, focused on its serviceability. Another material presented is white concrete, its advantage is the ease of colour choice. The authors also described the possibilities of using properly shaped architectural concrete as well as its unusual use in the form of doors. The entire publication concludes with a summary.