Waste materials are a major environmental problem, which is a threat to the environment. It is important to reuse these materials and dispose of them. Waste can be used in the construction industry in two ways: by reusing (reuse components) and recycling (processing waste into raw materials used in the production of building materials). The paper presents my own research using substrates resulting from the processing of waste: foam glass and high-impact polystyrene and the possibility of their use as modifiers composition of basic construction materials. Glass foam is made from glass cullet. It has many advantages, positive effect on the adsorption of sound and workability. Due to the spherical shape and low density it is used as an ultra-light filler. The second addition is High Impact Polystyrene (High Impact Polystyrene - HIPS for short) which is a butadiene rubber modified polystyrene. With the change amount of the rubber mechanical and physical properties of the material are also changed, for example, by increasing the toughness of HIPS. The article presents a critical review of the literature on changes in the composition of traditional building materials on the example of cellular concrete, cement and products of sand - lime. The paper presents my own research and detailed analysis of them. The aim of the study was to determine the impact of additives on the parameters of the physical and mechanical properties and microstructure of the newly created materials compared to their traditional counterparts. The analysis has been subjected to the results of my own research: compressive strength, water absorption, bulk density and construction of structural material. The results are presented in the form of tables and graphs

This article looked at the situation of university teachers in Poland during the COVID-19 epidemic as a result of their need to work remotely. The study was conducted in the first stage (I) on 21 academicians and in the second stage (II) on 18 academicians. The study was conducted to determine the level of productivity of the study group in their online learning competencies in relation to their well-being, as well as during the height, and weakening of the epidemic. The results of the survey conducted, especially during the height of the epidemic, indicated varying levels of self-evaluation of their productivity in relation to their digital competencies linked to the need for them to work remotely, which also affected their psychological well-being. Several cases of respondents indicated a negative assessment of their own productivity, and thus their quality of work life and sense of psychological well-being. However, some respondents, on the contrary, showed a desire to work, the need for self-improvement, and to continue their mission of teaching.

In this article, we examine the issue of Polish entrepreneurs’ attitudes towards knowledge workers above the age of 65 in the context of pro-social and citizenship behavior. The article was written as part of the diversity management paradigm. Firstly, it presents the existing literature on the subject, and then, we present our analysis on the results of a longitudinal study conducted among 93 entrepreneurs, owners, and co-owners of small and medium enterprises, during 2014 and 2019. During this time, legal regulation took place twice, extending and then shortening the period of obligatory work enabling employees to acquire the right to retire. The study was carried out using a specially developed questionnaire, whose reliability met the requirements of methodological correctness and two other research tools. Positive, neutral and negative attitudes were identified among entrepreneurs’ attitudes towards knowledge workers aged 65+. The research results show a correlation between the attitudes of entrepreneurs in 2014 and 2019, stabilization of these attitudes (in relation positive, neutral and negative attitudes), and their particularly significant relationship with organization-oriented citizenship behavior.

Complex construction projects require appropriate planning that allows for time and cost optimization, maximization of the use of available resources and appropriate investment control. Scheduling is a complicated process, due to the uncertainties and risks associated with construction works, the paper describes the development of the scheduling method traditionally used in Poland, based on data from KNR catalogs, by using the RiskyProject Professional program. In the RiskyProject Professional program, the risk and uncertainty with reference to a specific construction project were modeled, and the calculation results were compared with the real time of the project implementation. The conclusions from the work carried out confirm that the SRA (Schedule Risk Analysis) analysis of the base schedule allows for a more faithful representation of the actual conditions of a construction project. The probability of investment realization generated on the basis of the SRA analysis may be assumed at the level of 75÷90%.