Słowa kluczowe

wood |thermal conductivity coefficient λ for wood |thermal insulation of wood

Streszczenie

The article focuses on the study of the thermal properties of pine wood, a material traditionally used in construction, especially in Poland. The trend towards sustainable construction necessitates a deeper analysis of its properties. Due to the insufficient amount of data in the literature on the thermal conductivity of pine wood, detailed studies were conducted, taking into account different wood densities. Seasoned wood samples were subjected to various processes and tests, measuring the heat conduction coefficient under different conditions. These results are relevant in the context of sustainable construction and will assist in further research on wood as a building material. The studies also took into account the effects of temperature and humidity on the thermal properties of wood, which are crucial for its application in various environmental conditions.

Słowa kluczowe

building materials |thermal protection of building |single-family buildings |building technologies

Streszczenie

All buildings, regardless of their function, should exhibit appropriate durability and aesthetics while avoiding a negative impact on the environment. The selection of building materials is increasingly crucial in this regard. Each material possesses distinct strength, technical, or production parameters. However, with regulations becoming more stringent concerning the maximum energy consumption of buildings, it is imperative to scrutinize their thermal properties and the associated thermal conductivity coefficient (λ). The article conducts an analysis of available technologies for constructing external partitions in single-family housing and their influence on energy losses within the building. Popular building materials, such as cellular concrete, ceramic hollow bricks, prefabricated expanded clay concrete walls, and a wooden frame structure, were examined.

Słowa kluczowe

real estate market |primary real estate market |property |COVID-19

Streszczenie

The work includes an analysis of the primary real estate market in Cracow in 2017‑2020. The above analysis was carried out on the basis of transactions obtained from the official register at the city hall. The results of the research made it possible to observe the changes taking place in the market: the prices grew moderately, and the number of transactions was between 8,000 and 11,000 each year. In 2020, due to the COVID-19 pandemic, the number of transactions conducted dropped sharply. Despite the reduced interest of potential buyers, prices per square meter of residential space increased significantly during the period under review. Thus, the pandemic only affected the number of transactions and not the average price per unit of space.

Słowa kluczowe

Europe |skyscraper |super-slender tower |slender skyscraper |New York

Streszczenie

The latest construction technologies have enabled the erection of very slender skyscrapers. This phenomenon is developing significantly in New York, but very slender high-rise buildings are also being designed on other continents. The aim of this paper is to characterize existing and planned slender European skyscrapers. The study examined the location of slender high-rise buildings and their relationship with their surroundings. It sought differences and similarities in the location of slender European skyscrapers within the urban fabric compared to American skyscrapers. The presented examples of slender skyscrapers in Europe illustrate the diversity of their locations, the character of the areas in which they are designed, and the buildings themselves. The analysis of their relationship with the surroundings revealed many differences compared to New York's super-slender towers, such as the presence of open space, location at significant distances from other buildings, and even location in landscapes dominated by nature. Only some slender European high-rise buildings are designed in high-density development, which may resemble New York's super-slender towers.

Słowa kluczowe

Self-compacting concrete |Polyethylene terephthalate fibers |Recycled fine concrete aggregates |Flexural strength

Streszczenie

Concrete is currently the most frequently used material in the building sector due to its favourable properties. However, the proliferation of waste poses a significant environmental problem. Over the past three decades, researchers have explored the use of construction and demolition waste (CDW) as well as plastic waste as aggregates, binders, and fibres in construction materials. This approach has emerged as a notable solution to address environmental and economic challenges. The objective of this research is to assess the impact of polyethylene terephthalate fibres (PETF) on the behaviour of self-compacting concrete (SCC) with recycled fine concrete aggregates (RFCA). Natural fine aggregates (NFA) were used as a substitute for RFCA at different mass fractions (0–100%). Additionally, four volumetric fractions (V_f) of PETF (ranging from 0.3% to 1.2%) were added, and the findings revealed an improvement in the flexural strength and modulus of elasticity of the composite material obtained. However, as the V_f content of PET fibres and RFCA increased, the compressive strength decreased, negatively affecting water absorption by immersion and capillary water absorption. Using 100% RFCA and 1.2% PETF enhanced the modulus of elasticity and flexural strength of recycled self-compacting concrete (RSCC) by up to 25% and 9%, respectively.

Słowa kluczowe

housing estates |climate change |UTCI |ENVI-met

Streszczenie

Urban climate and its impact on the thermal comfort of residents are significant aspects in urban planning and the design of housing estates. The aim of this article is to investigate the temperature perception among residents in a contemporary residential area in Lublin during the hottest day, utilising an advanced computer simulation tool – the ENVI-met programme. A modern, densely built housing estate with no significant greenery was selected as a case study. General meteorological and spatial data were used for calibrating the housing estate model within the software. The housing estate model within the programme was calibrated using publicly available meteorological and spatial data, and computer simulations were conducted for Lublin's hottest day on 22 July 2022. Based on these simulations, the Universal Thermal Climate Index (UTCI) was calculated. The research results indicate that people experience moderate thermal stress in unshaded areas only at 4:00 pm, while in sunny locations, they experience strong to very strong heat stress throughout the day. This article underscores the importance of computer simulations in analysing the urban microclimate and provides insights into tools that can be used in urban planning and housing estate design processes, with the aim of creating more comfortable and environmentally friendly urban environments.

Słowa kluczowe

Haussmann |Paris |Les grands magasins

Streszczenie

The extensive transformation of 19th-century Paris significantly influenced the development of innovative architecture for large retail stores during that era. These structures were a response to the dynamic social, urban, and technological changes of the time. Buildings like Le Bon Marché, Le Printemps, La Samaritaine, and Galeries Lafayette became icons of retail trade, introducing a new approach to commerce and creating modern spaces to attract customers. Constructed with materials like steel, iron, and glass, these grand retail buildings featured spacious interiors without columns. Elements traditionally associated with public utility structures, such as domes, lanterns, and spires, became their distinctive features. This article aims to analyse the architecture of the department stores in Paris built between the 19th and 20th centuries. The author explores the impact of dynamic social, urban, and technological changes of that period on shaping the commercial spaces in the city. Tracing the history of buildings like Le Bon Marché, Le Printemps, La Samaritaine, and Galeries Lafayette allows for an understanding of the innovations in trade, architecture, and urban planning during this time.

Słowa kluczowe

environmental factors |open plan |open office |acoustic room comfort |architectural acoustics |physical workplace |healthy architecture |workspace

Streszczenie

Environmental factors in workspaces affect employee productivity and satisfaction, particularly in call centres. One of the most challenging issues in contemporary offices is overcoming the problems of concentration on work, despite adverse effects such as insufficient lighting, inappropriate acoustics, or inadequate ventilation. The challenges increase in open-plan solutions. This paper presents a case study from Turkey that elaborates on strategies to improve environmental performance in call centres. It is inspired by a questionnaire conducted among employees of a call centre, identifying existing design lacks. Based on the results, acoustic quality calculations of the physical workspace follow, and initial computing outcomes reveal that the conditions do not meet the standards for call centres. The authors propose strategies to improve acoustic performance in the workspace and apply them to a virtual model. Results reveal that the proposed solutions allow for meeting the standards. Based on the findings, the authors suggest several other strategies for improving the physical environmental quality of the place, thus forming a guideline for the architectural design of call centres. The study derives information from a specific case and context to propose universally applicable solutions. It fills a gap in the literature as it exemplifies the characteristics of call centres in Turkey, which have not been studied before.

Słowa kluczowe

Crumb rubber |styrene-butadiene rubber |fly ash |hot mix asphalt |Marshall properties

Streszczenie

The primary aim of this study is to evaluate the impact of incorporating crumb rubber (CR) and styrene-butadiene rubber (SBR) additives, ranging from 0% to 5% by weight of bitumen, on the performance of a bituminous concrete mixture using the wet process. Laboratory experiments, including the Marshall test, were conducted to establish the optimum bitumen content (OBC) for the hot mix. The study focuses on determining the optimal proportions of CR and SBR to achieve maximum strength. The results show that increasing the proportions of both CR and SBR leads to significant improvements in strength, with the maximum stability recorded at 16.14 kN and a flow of 1.23 mm for a mix containing 5% CR and 4% SBR. The findings further suggest an inverse relationship between CR content and strength, while an increasing SBR content enhances strength. Consequently, the optimal proportions for incorporating CR and SBR additives are identified as 5% and 4%, respectively.