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1
Content available Management of the Special Processes – An Experimental Study of Bent Reinforced Concrete Beams
Michałowska-Maziejuk Dorota, Klimecka-Tatar Dorota, Ingaldi Manuela, Kaczmarska Bożena, Czajkowska Agnieszka
Advances in Science and Technology. Research Journal
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2024
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Vol. 18, no 2
248--265
EN
The article presents an analysis of the results obtained from the testing of simply supported reinforced concrete beams subjected to four-point bending. The beams, with two levels of steel reinforcement (ρs1=1.26%, ρs2=0.71%), and dimensions of 0.12x0.30x3.30m, were subjected to loading involving a sudden increase in force with multiple unloading cycles to zero. The study included comparative analysis of deflection results obtained from experimental tests (calculated based on the curvature of the element and readings from measurement devices) with deflection values obtained through calculations based on two selected standards. Real values of ultimate bending moments were also compared with theoretical values. Additionally, compressive strength tests were conducted on eight cubic concrete specimens with a side length of b=150mm, obtained for each concrete batch. They constitute accompanying studies. Using standard procedures, strength and statistical parameters were estimated and evaluated, taking into account the assessment of the quality of the concrete production used to make the reinforced concrete beams. Ensuring compliance with the process of producing full-sized reinforced concrete beams with existing standard procedures, as well as attention to the quality of concrete production, contributed to achieving satisfactory results in the experimental tests. Knowledge about the impact of loading on mechanical properties enables effective management of factors shaping quality to obtain a construction material with optimal parameters.
2
Content available Determination of the linear correlation coefficient between Young’s modulus and the compressive strength in fibre-reinforced concrete based on experimental studies
Czajkowska Agnieszka, Raczkiewicz Wioletta, Ingaldi Manuela
Production Engineering Archives
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2023
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Vol. 29, Iss. 3
298-297
EN
The test procedures for determining Young's modulus in concrete are complicated and time-consuming. Therefore, attempts to search for alternative methods of its determination are not surprising. The relationship between the value of compressive strength and Young's modulus in concrete is known. However, the strength of this relationship in fibre-reinforced concrete has not been exactly described. The article attempts to investigate the strength of the correlation between Young’s modulus and the compressive strength of fibre-reinforced concrete. The influence of the amount of fibres on this relationship was also checked. Two types of specimen were used for the tests. The specimens differed in the content of steel fibres, 0.25% and 0.50%, respectively. In order to determine the correlation relationship, the method of linear regression and the coefficient of linear correlation were used. The use of the determination coefficient allowed us to examine the degree of explanation of one variable by another.
3
Content available Analysis of the survey results on the pro-ecological awareness of young people in the aspect of sustainable development
Czajkowska Agnieszka, Ingaldi Manuela
Management Systems in Production Engineering
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2023
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nr 3 (31)
312--321
EN
The objective of this paper is to propose effective methods to implement sustainable development principles among young people, both in schools and universities. The authors of this article recognize the significant potential among young individuals whose actions and choices have a substantial impact on the environment. By analyzing the knowledge and behaviors of young people towards sustainable development and environmental protection, based on surveys conducted among pupils and students from the south-eastern region of Poland, this paper identifies gaps that require improvement and proposes actions aimed at raising pro-ecological awareness among the youth. The analysis revealed that only 25% of the respondents have heard about the "Agenda for Sustainable Development – 2030", 20% were familiar with the goals of sustainable development, and few have participated in initiatives for sustainable development. However, 58% of respondents claimed to engage in activities for environmental protection in their daily lives. The article also presents the degree of compliance with the assumptions of the 2030 Agenda for Sustainable Development on both global and local scales. Furthermore, the paper analyzes two aspects of students' awareness of sustainable development: their knowledge of goals and documents, and their pro-ecological behavior in daily life. Based on the findings, this paper proposes ways to introduce sustainable development principles in selected areas of school and university functioning to enhance ecological awareness and shape pro-ecological attitudes among young people. Concrete actions to facilitate implementation are also suggested.
4
Content available Influence of maturing conditions of steel-fibre reinforced concrete on its selected parameters
Czajkowska Agnieszka, Raczkiewicz Wioletta, Bacharz Magdalena, Bacharz Kamil
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
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2020
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Vol. 9 Nr 1
47--54
EN
In the article the impact of varying humidity conditions on selected strength properties of hardened steel fibre-reinforced concrete (such as Young’s modulus and the compressive strength of concrete) were analysed. The analysis shows that the value of the Young’s modulus of concrete cured under 100% humidity conditions is the highest; 35% higher compared to concrete hardening in the laboratory hall and about 18% higher than modulus measured in the concrete samples maturing in the chamber. A much higher compressive strength of approx. 25% was observed in samples hardening under 100% humidity conditions than in the other two environments. It was also observed that the non-uniform distribution of samples in the chamber and opening and closing the chamber during sample maturation had an impact on the dispersion of the results and due to the coefficient of variation, results can be even worse than in free-maturing samples.
5
Content available Analysis of the structure of housing in Poland in the years 2009-2018
Czajkowska Agnieszka, Raczkiewicz Wioletta
Budownictwo i Architektura
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2020
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Vol. 19, no 1
39--46
EN
The article presents an analysis of the housing situation in Poland against the background of European Union countries that took place in the last decade, i.e. in the years 2009 - 2018. The average number of dwellings per 1,000 inhabitants was analysed, the relationship between the number of dwellings and their area was determined, and the increase in the number of dwellings completed over the period was determined divided into flats: individual, cooperative, company and communal, as well as flats intended for sale or for rent.
PL
Mieszkanie to z jednej strony zaprojektowany i konstrukcyjnie wydzielony trwałymi ścianami lokal, a z drugiej strony przestrzeń, która jest niezbędna do zapewnienia bezpieczeństwa, prywatności oraz odpowiednich warunków do nauki i życia. W artykule dokonano analizy sytuacji mieszkaniowej w Polsce na tle krajów Unii Europejskiej. Przeanalizowano przeciętną liczbę mieszkań na 1000 ludności, zależność między liczbą mieszkań a ich powierzchnią oraz strukturę liczby mieszkań oddanych do użytkowania na przestrzeni dziesięciu lat (2009-2018) z podziałem na mieszkania: indywidualne, sprzedaż lub wynajem, spółdzielcze, zakładowe i komunalne.
6
Content available Wykorzystanie diagramu Pareto – Lorenza do analizy przyczyn katastrof budowlanych spowodowanych błędami ludzkimi z uwzględnieniem cyklu życia obiektu budowlanego w latach 2013-2017
Czajkowska Agnieszka
Zeszyty Naukowe. Quality. Production. Improvement
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2019
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No. 1 (10)
52--59
PL
W artykule przeanalizowano przyczyny katastrof budowlanych w latach 2013-2017. W prowadzonej analizie przyczyny wystąpienia katastrof budowlanych powiązano z cyklem życia obiektu budowlanego. Szczególną uwagę poświęcono błędom ludzkim wpływającym na wystąpienie katastrof budowlanych. Do identyfikacji najczęstszych błędów skutkujących wystąpieniem katastrof budowlanych zastosowano diagram Pareto-Lorenza. Z przeprowadzonej analizy wynika, że dwa błędy przyczyniają się do wystąpienia 75% wszystkich katastrof. Błędy te należą do dwóch spośród pięciu głównych faz cyklu życia obiektu budowlanego - utrzymania obiektu budowlanego oraz prowadzenia robót w istniejącym obiekcie.
EN
The paper reviews the causes of structural failures in 2013-2017. The analysis concerned the links between the causes of structural failures and the life cycle of a building. Particular emphasis was on human errors affecting the occurrence of structural failures. The Pareto-Lorenz diagram was used to identify the most common errors leading to the occurrence of the failures. The analysis showed that two errors contribute to 75% of all failures. These errors occur in two of the five major phases of the life cycle of a building - maintenance and construction works in the existing building
7
Content available Identification of the needs and expectations of university students from engineering courses on the example of a university in Poland
Czajkowska Agnieszka, Ingaldi Manuela
System Safety : Human - Technical Facility - Environment
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2019
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Vol. 1, nr 1
498--505
EN
The paper assessed the quality of educational services using the SERVQUAL. In order to use the SERVQUAL method for identification of the needs and expectations of university students from engineering courses, the statements used in the method were modified by adjusting them to key characteristics of services provided by the higher education system. The aim of the paper was to analyze gaps in expectations concerning services and the perceived level of meeting these services. The paper has a form of a case study.
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