Applied sciences

Archives of Civil Engineering

Content

Archives of Civil Engineering | 2024 | vol. 70 | No 2

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Abstract

The article addresses the spatial aspect as a factor of significant importance for the success of rehabilitation functions. The location of cognitive rehabilitation activities in an open, urban space allows people with reduced fitness to take up stress-free rehabilitation activity without time limitations and without stigmatization. The architectural design of the positions for mental rehabilitation implemented in public space was addressed to people with dysfunctions of all ages and people suffering from covid fog as a result of a past disease. This article presents the results of preliminary observational studies conducted on a focus group of COVID19 convalescents, who were provided with an open rehabilitation space equipped with 12 rehabilitation tables. The results showed the decisive influence of the placement of rehabilitation elements in the open green space for rehabilitation results. The task of the mind training path is to raise and maintain intellectual fitness in a friendly recreational space. Prototype studies have shown that, de-pending on the arrangement of individual stops, the mind training path offers different efficiency of exercises, but it is always a better result than in closed spaces of medical facilities.
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Authors and Affiliations

Rafał Blazy
1
ORCID: ORCID
Hanna Hrehorowicz-Gaber
2
Alicja Hrehorowicz-Nowak
3

  1. Cracow University of Technology, Faculty of Architecture, Departmentof Spatial Planning, Urban and Rural Design A-5, Warszawska Street 24, 31-155 Cracow, Poland
  2. Cracow University of Technology, Faculty of Architecture, Department of SpatialPlanning, Urban and Rural Design A-5, Warszawska Street 24, 31-155 Cracow, Poland
  3. CracowUniversity of Technology, Faculty of Architecture, Department of Spatial Planning,Urban and Rural Design A-5,Warszawska Street 24, 31-155 Cracow, Poland
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Abstract

In accordance with the principles of sustainable construction, the results of Life Cycle Assessment (LCA) technique are useful inputs to the decision-making process when designing a building. This article presents such an analysis of a finished building product, which is a modified concrete mix. The calculations took into account the phases of the A1–A4 cycle, i.e. from the extraction of raw materials to the transport of the finished material to the construction site. Test results for concrete mixes and 28-day solid concrete are presented in tabular form. Based on all the test results obtained, it was found that the addition of waste polypropylene fibres has a positive effect on the key properties for the floor concrete. It has been found that proper processing of banding tapes or other polypropylene waste into macro-fibres can be a good example of proper waste management and can contribute to a significant reduction in residual waste. This additive is emission-free and sourced from recycling, making it an excellent alternative to commonly used dispersed reinforcement.
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Authors and Affiliations

Anna Starczyk-Kołbyk
1
ORCID: ORCID

  1. Military University of Technology, Faculty of Civil Engineering and Geodesy, ul. gen. SylwestraKaliskiego 2, 00-908 Warsaw, Poland
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Abstract

The work is devoted to the definition of solutions for skyscraper office buildings in Warsaw against the background of the latest global technology of vertical communication systems. For this purpose, the paper presents the examples of research by design of four high-rise buildings in Warsaw, which indicate the adopted methodology of developing optimal solutions in the field of elevator service as well as the results of research and finally selected systems. The aim of the research was to achieve the initial criteria for the system’s operation. The research was carried out by iterating and varianting various configurations of the system and checking it as the basis for building core solutions. Solutions that met the defined criteria were optimal in terms of building efficiency and rental flexibility. Empirical research and its results are presented against the background of world achievements. The results indicate that both the research methodology and the systems used follow the contemporary development of the latest globally present solutions.
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Authors and Affiliations

Marcin Goncikowski
1
ORCID: ORCID

  1. Warsaw University of Technology, Faculty of Architecture, ul. Koszykowa 55, 00-659Warsaw, Poland
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Abstract

Precise determination of the location of underground utility networks is crucial in the field of civil engineering for: the planning and management of space with densely urbanized areas, infrastructure modernization, during construction and building renovations. In this way, damage to underground utilities can be avoided, damage risks to neighbouring buildings can be minimized, and human and material losses can be prevented. It is important to determine not only the location but also the type of underground utility network. Information about location and network types improves the process of land use design and supports the sustainable development of urban areas, especially in the context of construction works in build-up areas and areas planned for development. The authors were inspired to conduct research on this subject by the development of a methodology for classifying network types based on images obtained in a non-invasive way using a Leica DS2000 ground penetrating radar. The authors have proposed a new classification algorithm based on the geometrical properties of hyperboles that represent underground utility networks. Another aim of the research was to automate the classification process, which may support the user in selecting the type of network in images that are sometimes highly noise-laden. The developed algorithm shortens the time required for image interpretation and the selection of underground objects, which is particularly important for inexperienced operators. The classification results revealed that the average effectiveness of the classification of network types ranged from 42% to 70%, depending on the type of infrastructure.
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Authors and Affiliations

Klaudia Pasternak
1
ORCID: ORCID
Anna Fryskowska-Skibniewska
2
ORCID: ORCID

  1. Military University of Technology (WAT), Faculty of Civil Engineering and Geodesy, Department ofImagery Intelligence, S. Kaliskiego 2, 00-908 Warsaw, Poland
  2. Military University of Technology (WAT), Faculty of Civil Engineering and Geodesy,Department of Imagery Intelligence, S. Kaliskiego 2, 00-908Warsaw, Poland
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Abstract

This paper presents the results of a composite consisting mainly of industrial waste bound by a hydraulic binder. The composite consists of unburnt coal-mining slate, shredded rubber waste (SRW), fly ash and CEM I cement. The purpose of using the above components was to protect the unburnt coal-mining slate from the negative effects of water, which causes degradation of the aggregate grain size and significantly affects the load-bearing capacity of the aggregate. This was achieved through the use of a binder consisting of shredded waste rubber, fly ash and cement, which imparts hydrophobic properties to the composite. The composite is to be used in road pavement construction and earthworks as a substitute for standard materials. This paper focuses on testing the effects of 5, 10 and 15% additions of shredded rubber waste (SRW) on the physical and mechanical parameters of the composite, mainly compressive strength, water absorption by mass, capillary rise and deformability under cyclic loading. The composite was tested under cyclic loading conditions using a measurement system based on digital image correlation (DIC), with which the deformations occurring on the surface of the test specimens were determined. The results obtained showed the influence of shredded rubber waste additives on the decrease in compression strength (after 7 and 28 days of specimen care), mass water absorption and capillary rise, as well as an increase in the deformability of the composite under destructive loading and cyclic loading.
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Authors and Affiliations

Konrad Walotek
1
ORCID: ORCID
Joanna Bzówka
2
ORCID: ORCID
Adrian Ciołczyk
1
ORCID: ORCID

  1. Silesian University of Technology, Faculty of Civil Engineering, Department of Geotechnics andRoads, ul. Akademicka 2A, 44-100 Gliwice, Poland
  2. Silesian University of Technology, Faculty of Civil Engineering, Department ofGeotechnics and Roads, ul. Akademicka 2A, 44-100 Gliwice, Poland
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Abstract

The aim of the study was to determine the shear strength of mineral and anthropogenic soil of similar grain size as a function of the applied shear rate and water saturation. Stability calculations using the finite element method of the road embankment model were also carried out to demonstrate the variation in factor of safety values depending on the adopted values of the angle of internal friction and cohesion. The tests were carried out in a direct shear apparatus in a 100 x 100 mm box with a sample height of 20.5 mm. The samples were formed directly in the apparatus box at optimum moisture content until a compaction index of IS = 1.00 was obtained. Tests were carried out under conditions without and with water saturation at shear rates of 0.01, 0.05, 0.1, 0.5 and 1.0 mm•min–1 until 18% horizontal displacement was achieved. The results showed that the effect of shear rate on the strength parameters was not unequivocal and was much smaller than the changes caused by saturation of samples. An increase in shear rate resulted in small changes in the angle of internal friction with a tendency towards a decrease. In contrast, cohesion varied over a much larger range with increasing shear rate, with an apparent initial decrease and subsequent increase. The saturation of the samples resulted in a decrease in the angle of internal friction of the cohesive soil and an increase for the ash-slag mixture. The cohesion of both soils decreased. The results obtained from the road embankment model stability calculations confirmed that soil saturation had a greater influence on the factor of safety values obtained than the shear rate.
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Authors and Affiliations

Andrzej Gruchot
1
ORCID: ORCID
Tymoteusz Zydron
2

  1. University of Agriculture in Kraków, Faculty of Environmental Engineering and Land Surveying,Department of Hydraulic Engineering and Geotechnics, al. Mickiewicza 24/28, 30-059 Kraków, Poland
  2. University of Agriculture in Kraków, Faculty of Environmental Engineering and LandSurveying, Department of Hydraulic Engineering and Geotechnics, al. Mickiewicza 24/28, 30-059 Kraków, Poland
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Abstract

A new world record for crude steel production was recorded in 2021, which increased by 3.8% over 2020. This also affected the amount of slag produced with this production. Total waste from industrial and construction production throughout the European Union accounts for as much as 48%. Therefore, waste management should provide for the recovery of as many resources as possible. European Union strategies in line with the circular economy objectives focus on ensuring policy coherence in the areas of climate, energy efficiency, construction and demolition waste management and resource efficiency. Slags are a material of interest to researchers in terms of their use in construction. Slags, on the one hand, are materials that are becoming better understood on the other hand, we are making sure of the heterogeneity of these materials. The characteristics of physical properties of slags are influenced by many factors, including the furnace split in which they are produced. This prompts the search for tools to help determine the parameters of slags based on already available data. The study aimed to verify the hypothesis that it is possible to determine the parameter of the filtration coefficient, relevant to applications in earth structures using the machine learning algorithm – Random Forest. In the study, two types of material were analysed: blast furnace slag and furnace slag. The results of the analysis yielded a high coefficient of determination (R2) – 0.84–0.92. This leads us to believe that the algorithm may prove useful in determining filtration parameters in slags.
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Authors and Affiliations

Justyna Dzięcioł
1
ORCID: ORCID
Wojciech Sas
2
ORCID: ORCID

  1. Warsaw University of Life Sciences – SGGW, Institute of Civil Engineering, 159 Nowoursynowska,02-776 Warsaw, Poland
  2. Warsaw University of Life Sciences – SGGW,Water Centre SGGW, 159 Nowoursynowska,02-776 Warsaw, Poland
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Abstract

The modern development of urban areas is related to, among others, the location of industrial facilities on the outskirts of cities. More and more often, commercial buildings are founded on areas that have not been used for construction so far. Such areas include, among others: reclaimed lignite mine banks in the Konin region. The man-made soil is a chaotic mixture of fragments of glacial tills and Pliocene clays, often exceeding 20 m in thickness, which is naturally consolidated over time. Due to the method of formation of the embankment, despite the fact that banks are made of natural soil, their strength and deformation characteristics clearly differ from those characteristic of lithologically similar soils deposited as a result of geological processes. In this case, the use of a standard test approach may overestimate the strength and stiffness of the soil. Due to the complex structure of the bank in-situ tests were used for geotechnical exploration: CPTU and FVT, as well as laboratory tests in a triaxial apparatus and an oedometer. The results were compared with the results of studies conducted in similar naturally deposited soils. The obtained results provide valuable geotechnical characteristics of the embankment soil, which in its large fragments is built of natural soil clasts. The obtained results indicate a relatively small change in the geotechnical properties of the soils incorporated into the embankment within individual clasts of the natural soil (on a local scale) and a clear deterioration in the scale of the entire embankment, treated as the impact zone of building structures.
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Authors and Affiliations

Jędrzej Wierzbicki
1
ORCID: ORCID
Katarzyna Stefaniak
1
ORCID: ORCID
Anita Hofman
1
ORCID: ORCID

  1. Institute of Geology, Adam Mickiewicz University, Poznan, Poland
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Abstract

In the case analysed, a glass fibre mesh was applied under the asphalt layer during a rehabilitation treatment. Because only one lane was reinforced, the test section can be used to observe the influence of glass fibre mesh on the relationship between the selected deflection basin parameters (RoC, BLI, MLI, and LLI) and back-calculated pavement layer moduli. The FWD measures were used to determine the bowl of deflection indicators and to back-calculate the layer’s moduli. The values of DBP-s allowed confirmation of the technical condition of pavement construction. The first measures were carried out in 2019 and repeated in 2021; the results were then compared and analysed. Influence was observed on the relationship between the deflection basin and moduli, especially for the base course and subgrade. The reinforced lane showed a better coefficient of determination between DBPs and moduli in 2019, but in 2021 relationships were observed only for LLI and subgrade moduli. The unreinforced lane, however, showed the mentioned relationships in both 2019 and 2021. Because of a relatively small number of measurement points, the presented analyses and observations should be considered as preliminary. Presented results and relationships are another step into developing an alternative approach to determining the initial pavement moduli i.e. to use as a seed moduli.
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Authors and Affiliations

Mateusz Kałuża
1
Mirosław Kotasinski
1

  1. Silesian University of Technology, Faculty of Civil Engineering, Akademicka 5, 44-100 Gliwice,Poland