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Number of results: 6
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Abstract

The influence that general contractors and subcontractors have on the operation of a company is immense. Keeping this in mind, the authors have decided to develop and algorithm based on the analysis of partnering relations between construction companies that would select the best possible construction company for the purposes of cooperation. This algorithm, developed for a given construction company, is meant to support its decision-making system in the field of the selection of another construction company to cooperate with. The author has made references to earlier research, in which she had used the ELECTRE III method, and in which she bad analysed the possibility of applying the BIPOLAR method in order to solve the problem of the selection of a construction company to develop partnering relations with. The author provided an example of the calculations performed for a selection of construction companies.

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Authors and Affiliations

E. Radziszewska-Zielina
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Abstract

Paper presents the issue related to the selection of slab formwork taking into account the criteria that are currently the most important The in the process of the construction project execution. The analysis included selected, modern system solutions, which significantly accelerate the tempo of reinforced concrete works and, as a consequence, increase the effectiveness of the construction project execution. The innovative system of drop heads, which the analysed slab formwork is equipped with, is offered by various formwork producers. The offered solutions, however, differ not only in the construction of the drophead itself, but also in the arrangement and variety of other system elements, as well as the scheme of their operation, which may ultimately significantly affect the effectiveness of their application. For that reason, the choice of formwork for specific buildings should be made from among carefully analysed several variants of the wide market offer. The paper presents the results of analysis and evaluation of formwork systems with dropheads according to the proposed methodology, including multi-criteria analysis.

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Authors and Affiliations

Aleksandra Radziejowska
ORCID: ORCID
Anna Sobotka
ORCID: ORCID
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Abstract

This paper presents the use of multi-criteria analysis as a tool that helps choosing an adequate technology for a household wastewater treatment plant. In the process of selection the criteria of sustainable development were taken into account. Five municipal mechanical-biological treatment plants were chosen for the comparative multi-criteria analysis. Different treatment technologies, such as sand filter, activated sludge, trickling filter, a hybrid system - activated sludge/trickling filter and a hybrid constructed wetland system VF-HF type (vertical and horizontal fl ow) were taken into account. The plants’ capacities were 1 m3∙d-1 (PE=8) and they all meet the environmental regulations. Additionally, a solution with a drainage system was included into the analysis. On the basis of multi-criteria analysis it was found that the preferred wastewater treatment technologies, consistent with the principles of sustainable development, were a sand filter and a hybrid constructed wetland type VF-HF. A drainage system was chosen as the best solution due to the economic criteria, however, taking into consideration the primary (ecological) criterion, employment of such systems on a larger scale disagree with the principles of sustainable development. It was found that activated sludge is the least favourable technology. The analysis showed that this technology is not compatible with the principles of sustainable development, due to a lack of proper technological stability and low reliability.

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Authors and Affiliations

Krzysztof Jóźwiakowski
Zbigniew Mucha
Agnieszka Generowicz
Stanisław Baran
Jolanta Bielińska
Włodzimierz Wójcik
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Abstract

Given Morocco’s geographical position and climatic conditions, solar energy will supply a large portion of the country’s energy demand. In this paper, the suitability of Moroccan lands for hosting Solar Power Plants was studied using the combination of the Geographic Information System (GIS) and the Analytical Hierarchy Method (AHP). The multi-criteria decision framework integrates technical, socio-economic and environmental constraints. For this purpose, a GIS database was created using layers from various sources. In addition, since the potential of Global Horizontal Irradiation (GHI) is the most relevant criterion for the selection of solar farms, a high-quality solar satellite map with a spatial resolution of 0.27 km was used, covering a period from 1994 to 2018. Obtained results show a great potential for solar energy development in Morocco, represented by the availability of 90% of areas. In fact, the resulting map was classified into 6 different classes, namely: Very high suitability, High suitability, Moderate suitability, Low suitability, Very low suitability and Exclusion areas, which 53.88%, 24.08%, 0.15%, 0%, 0% and 21.89% are respectively the percentages of their area occupation. According to the performed investigations, the most significant criteria that should be considered include: The Global Horizontal Irradiation, Slope, Temperature and Slope orientation. The obtained map was then compared to the existing solar farms, and show that all the existing projects are located within areas classified as highly suitable.
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Authors and Affiliations

Meryem Taoufik
1
ORCID: ORCID
Meriem Laghlimi
1
ORCID: ORCID
Ahmed Fekri
1

  1. Laboratory of Applied Geology, Geomatics and Environment, Faculty of Sciences Ben M’Sik, Hassan II University of Casablanca, Casablanca, Morocco
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Abstract

This paper presents a study conducted using the Multi-Criteria Analysis (MCA) to explore surface irrigation potential zones in the Didesa sub-basin of the Abay basin in Ethiopia. Physical land features, such as land use / land cover (LULC), slope, soil depth, drainage, and road proximity, along with climate factors like rainfall and evapotranspiration, and population density, were identified as criteria for the exploration. The analytic hierarchy process (AHP) is a powerful structured decision-making technique commonly used for complex multi-criteria analysis problems where multiple criteria need to be considered. The importance of the criteria was prioritised and ranked in the analytic hierarchy process (AHP). Five qualitative-quantitative based surface irrigation potential zones were identified, namely highly suitable (48.40%), moderately suitable (27.26%), marginally suitable (13.27%), not suitable (4.91%), and irrigation constraints (6.16%). The consistency of the AHP technique in the exploration of surface irrigation potential zones is evaluated by the consistency index at CI = 0.011 and confirmed the correctness of weights assigned for the individual key factor in the AHP. The accuracy of the potential zones generated in the AHP was evaluated with ground-truth points and a supervised LULC classification map. Moreover, a good agreement was made among the classes with the kappa index ( KI = 0.93). Therefore, the application of the MCA for the exploration of surface irrigation potential zones was successful, and the results of the study will be useful to strengthen the irrigation in the explored potential zones.
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Authors and Affiliations

Habtamu Tamiru
1
ORCID: ORCID
Megersa O. Dinka
2
ORCID: ORCID

  1. Wollega University, Department of Water Resources and Irrigation Engineering, PO box 395, Nekemte, Ethiopia
  2. University of Johannesburg, Department of Civil Engineering Science, Johannesburg, South Africa
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Abstract

Currently, more and more investments are carried out in areas with difficult ground conditions, where in addition there may be a high level of groundwater. Therefore, it is necessary to use technologies which ensure the safety of the building in the exploitation phase by, among others, ensuring appropriate leak-tightness of its underground part. The article focuses on presenting the application of watertight concrete system (WCS), also known as "white tub" technology, which is an effective way to protect the underground part of the building against the destructive effects of water. The aim of this paper is to present and analyze selected methods of securing the underground parts of erected buildings using the "white tub" technology. In this paper, the authors analyze and select the solution using a multi-criteria analysis. The presented method will be used on a selected object.
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Bibliography

[1] J. Bilcik, R. Sonnenschein, K. Gajdosova, “Design and execution of watertight concrete constructions”, Key Engineering Materials, 2016, vol. 691, no. pp. 209–219, 2016; DOI: 10.4028/www.scientific.net/KEM.691.209.
[2] R. Al-Rashed, M. Jabari, “Dual-crystallization waterproofing technology for topical treatment of concrete”, Case Studies in Construction Materials, 2020, vol. 13. DOI: 10.1016/j.cscm.2020.e00408.
[3] A. Radziejowska, A. Sobotka, “Comparative analysis of slab formwork of monolithic reinforced concrete buildings”, Archives of Civil Engineering, 2020, vol. 66, no. 1, pp. 127–141.
[4] M. Rokiel, “Zastosowanie betonu wodonieprzepuszczalnego w tzw. technologii białej wanny – cz. I – Inzynier Budownictwa”, [Online]. Available: https://inzynierbudownictwa.pl/zastosowanie-betonuwodonieprzepuszczalnego-w-tzw-technologii-bialej-wanny-cz-i/. [Accessed: 07 Jul. 2021].
[5] M. Rokiel, “Zastosowanie betonu wodonieprzepuszczalnego w tzw. technologii białej wanny – cz. II”, Inzynier Budownictwa, 2017, no. 2, pp. 75–79.
[6] A. Radziejowska, K. Zima, “Multicriteria analysis in selecting the optimal variant of solar system”, E3S Web of Conferences, 2016, vol. 10, DOI: 10.1051/e3sconf/20161000078.
[7] T. Saaty, Fundamentals of decision making and priority theory with the analytic hierarchy process. RWS Publications, 2000.
[8] PN-EN 1992-3:2008/NA:2010 – wersja polska. [Online]. Available: https://sklep.pkn.pl/pn-en-1992-3-2008-na-2010p.html. [Accessed: 02 Jun. 2021].
[9] PN-EN 206¸A1:2016-12 – wersja angielska. [Online]. Available: https://sklep.pkn.pl/pn-en-206-a1-2016-12e.html. [Accessed: 02 Jun. 2021].
[10] B. France, Warunki techniczne wykonania i odbioru robót budowlanych, czesc C Zabezpieczenia i izolacje, zeszyt 12. Czesci podziemne budynków wykonanych z betonu wodoszczelnego. Uszczelnianie miejsc newralgicznych, Warszawa: ITB, 2017.

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Authors and Affiliations

Aleksandra Radziejowska
1
ORCID: ORCID
Kazimierz Linczowski
1
ORCID: ORCID

  1. AGH University of Science and Technology in Cracow, Faculty of Civil Engineering and Resource Management, Department of Geomechanics, Civil Engineering and Geotechnics, Av. Mickiewicza 30, 30-059 Cracow, Poland

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