RESUMEN
Near misses are referred to in literature as precursors of occupational accidents. These events, and their relationships with occupational accidents in various economic sectors have been the subject of research in several countries around the world. In Poland, there has not been a lot of research with regards to near misses in the construction industry, and the published materials are of a very general nature. This article aims to fill the existing research gap regarding the relationship between near misses and occupational accidents in the Polish construction industry. The aim of the research presented in the article was to identify the qualitative and quantitative structure of hazardous events in the construction industry, and to estimate the a posteriori probability of the occurrence of such events. The research was carried out on the basis of information obtained from the hazardous event registration system from a large Polish enterprise that carried out construction works in Poland in the years 2015-2022. Identified dangerous events in the construction industry were divided into two generic groups, i.e. occupational accidents and near misses. Within each group, eight categories of hazardous events were identified, and subcategories were defined within each category. The power of each set and subset of events was then calculated. The posterior probability of the occurrence of events classified into individual sets was estimated using Bayes' theorem. Cross-validation of the obtained results was performed. Conclusions resulting from the conducted analyzes were formulated. The most common category of the analyzed dangerous events in the construction industry is "being hit by objects"; "being run over/falling over" and "work environment". Knowledge of the most common causes of near misses will allow actions that aim to reduce the number of occupational accidents to be determined.
RESUMEN
Granite is a well-known building and decorative material, and, therefore, the amount of produced waste in the form of granite powder is a problem. Granite powder affects the health of people living near landfills. Dust particles floating in the air, which are blown by gusts of wind, can lead to lung silicosis and eye infections, and can also affect the immune system. To find an application for this kind of waste material, it was decided to study the effect of partially replacing cement with waste granite powder on the properties of fresh and hardened mortars intended for masonry applications. The authors planned to replace 5%, 10%, and 15% of cement with waste material. Series of mortar with the addition of granite powder achieved 50% to 70% of the compressive strength of the reference series, and 60% to 76% of the bending strength of the reference series. The partial replacement of cement with the granite powder significantly increased the water sorption coefficient. The consistency of the fresh mortar, and its density and water absorption also increased when compared to the reference series. Therefore, Granite powder can be used as a partial replacement of cement in masonry mortars.
