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Volume 16 (2021): Issue 2 (December 2021)

Volume 16 (2021): Issue 1 (June 2021)

Volume 15 (2020): Issue 2 (December 2020)

Volume 15 (2020): Issue 1 (September 2020)

Volume 14 (2019): Issue 2 (December 2019)

Volume 14 (2019): Issue 1 (December 2019)

Volume 13 (2018): Issue s1 (March 2018)
Special Issue

Volume 13 (2018): Issue 1 (December 2018)

Volume 12 (2017): Issue 2 (December 2017)

Volume 12 (2017): Issue 1 (June 2017)

Volume 11 (2016): Issue 2 (December 2016)

Volume 11 (2016): Issue 1 (June 2016)

Volume 10 (2015): Issue 2 (November 2015)

Volume 10 (2015): Issue 1 (June 2015)

Volume 9 (2014): Issue 2 (November 2014)

Volume 9 (2014): Issue 1 (June 2014)

Volume 8 (2013): Issue 2 (November 2013)

Volume 8 (2013): Issue 1 (June 2013)

Volume 7 (2012): Issue 2 (November 2012)

Volume 7 (2012): Issue 1 (June 2012)

Journal Details
Format
Journal
eISSN
1338-7278
First Published
29 Mar 2013
Publication timeframe
2 times per year
Languages
English

Search

Volume 14 (2019): Issue 1 (December 2019)

Journal Details
Format
Journal
eISSN
1338-7278
First Published
29 Mar 2013
Publication timeframe
2 times per year
Languages
English

Search

12 Articles
Open Access

Evaluating of daylighting in selected office room: Case of Study

Published Online: 31 Dec 2019
Page range: 7 - 15

Abstract

Abstract

On average, we spend 90% of our time indoor particularly at work and a healthy work space is essential to that feeling of wellbeing. In a typical building, lighting accounts for up to 40% of energy consumption. Allowing more natural light to penetrate the building and controlling both the light and heat components of power consumption, will result in significant reductions. However, using natural light doesn´t come without some issues. Glare, overheating, variability and privacy issues can all cause problems. Daylight is a basic human need, which is highlighted by the provision of transparent and translucent surfaces to all occupied spaces that we see around us. In many cases, the drive to create healthier, more occupant-conscious buildings works hand in hand with the requirement for greater energy efficiency. This article presents illumination of indoor workspace using daylight lighting. Measured values were compared with values calculated by simulation program Velux Daylight Visualizer 3.

Keywords

  • daylighting
  • glare
  • daylight factor
  • workspaces
  • illuminance
  • simulation
Open Access

Light Pipe Comparative Study

Published Online: 31 Dec 2019
Page range: 17 - 26

Abstract

Abstract

Results of daylight illuminance measurements of the field testing of two light guides with different roof installations is presented in the article. The first one is a common tubular system with a glass roof dome and the second one is a new light guide prototype with a concentrator head. The daylight illuminance was measured in a test chamber with the light guides installation. The measurements were carried out at the end of a summer season from August to September 2017. The measured data show differences in the daylight illuminance of the two tested light guides. The measured data were compared with simulation outputs in software Holigilm. In summary, it was found that the common light guide is about 37 percentage more efficient in light transmittance compared to the new light guide prototype. In temperate climate with dominant cloudy and partly cloudy daylight conditions the common light guide transmitted more light that the device with the concentrator head which reduced light transmission much more.

Keywords

  • light guide
  • light measurements
  • daylight evaluations
Open Access

Utilizing drone technology in the civil engineering

Published Online: 31 Dec 2019
Page range: 27 - 37

Abstract

Abstract

An unmanned aerial vehicle (UAVs), also known as drone technology, is used for different types of application in the civil engineering. Drones as a tools that increase communication between construction participants, improves site safety, uses topographic measurements of large areas, with using principles of aerial photogrammetry is possible to create buildings aerial surveying, bridges, roads, highways, saves project time and costs, etc. The use of UAVs in the civil engineering can brings many benefits; creating real-time aerial images from the building objects, overviews reveal assets and challenges, as well as the broad lay of the land, operators can share the imaging with personnel on site, in headquarters and with sub-contractors, planners can meet virtually to discuss project timing, equipment needs and challenges presented by the terrain. The aim of this contribution is to create a general overview of the use of UAVs in the civil engineering. The contribution also contains types of UAVs used for construction purposes, their advantages and also disadvantages.

Keywords

  • civil engineering
  • data capture
  • unmanned aerial vehicle
  • drone
  • aerial mapping
Open Access

The effect of CO2 on cement composites produced with an admixture of waste sludge water from a concrete plant

Published Online: 31 Dec 2019
Page range: 39 - 46

Abstract

Abstract

This article presents the results of a research dealing with the effect of CO2 on cement composites prepared on the basis of waste sludge water from the concrete plant. The designed formulas R1 and R3 use waste sludge water from the concrete plant as a partial or complete replacement of mixing water in the production of cement composites. The mixing water was replaced by waste sludge water in the amounts of 25%, 50%, 75% and 100%. Laboratory tests that are defined in ČSN EN 1008 standard were performed in order to determine the effect of partial or complete replacement of mixing water. The test specimens were further subjected to the effect of CO2 in the Lamart laboratory chamber, where the effect of CO2 was simulated for the period 50 years. Subsequently, the cement composites were tested for their strength characteristics (tensile flexural strength, compressive strength) and subjected to a mineralogical analysis. The results show that the effect of CO2 will reduce the strength characteristics of the composite compared to the comparative samples.

Keywords

  • accelerated carbonation of composite
  • replacement of mixing water
  • waste water from concrete plant
  • cement composites
  • tensile flexural strength
  • compressive strength
Open Access

Evaluation of concrete deterioration under simulated acid rain environment

Published Online: 31 Dec 2019
Page range: 47 - 54

Abstract

Abstract

Acid rain is identified as one of the most serious environmental problems nowadays and it is mainly a mixture of sulfuric and nitric acids. Deterioration of concrete structures exposed to aggressive acid rain attack is a key durability issue that affects the performance and maintenance costs of vital civil infrastructures. The motivation for understanding the acid rain corrosion process is high because of the early age deterioration of many concrete structures exposed to acid rain. The main objective of this study was to investigate the durability of concrete specimens with different supplementary cementitious materials, such as fly ash, zeolite and blast furnace slag against acid rain attack. Experiments of acid rain simulation influence on the composites were carried out for 7 weeks and parameters like visual changes, absorbability and leachability of calcium and silicon ions were evaluated. The increase in absorbability was detected for all samples while the sample with blast furnace slag was identified to be the most durable in this point of view. The most durable sample considering leached-out calcium and silicon ions was found to be sample with fly ash.

Keywords

  • concrete
  • supplementary cementitious materials
  • deterioration
  • acid rain
Open Access

Verification of building environmental assessment system for houses

Published Online: 31 Dec 2019
Page range: 55 - 66

Abstract

Abstract

Sustainable construction and its architecture of buildings seeks to minimize the negative environmental impact of buildings by efficiency in the use of materials, energy, and development space and the ecosystem at large. Sustainable buildings use a conscious approach to energy and ecological conservation in the design of the built environment in cities. This article is devoted to the environmental assessment of three family houses which represent three different material and design solutions. The houses were evaluated through the Slovak building environmental assessment system (BEAS), which has been developed for Slovak conditions at the Faculty of Civil Engineering, TUKE. This study shows that the influence of green design, compared to traditional construction, is important and more beneficial for the practice of designing sustainable buildings. It creates the most comprehensive relationship between the building and its environment and significantly affects building sustainability.

Keywords

  • House
  • environmental assessment
  • BEAS
Open Access

Selected problems of thermal insulation of historical buildings

Published Online: 31 Dec 2019
Page range: 67 - 74

Abstract

Abstract

There are problems with historical buildings when changing the thermal insulation properties of buildings. The Energy Efficiency Act exempted historic buildings from certification. Not all old, historic buildings have monument protection. It is necessary to take into account the above mentioned facts in case of renovation and reconstruction of an old building. Otherwise, a normal building is approached and a building of historical value is treated differently. Methods hidden insulation, which preserves the authenticity of cultural monuments and real estate in the heritage areas, is a current challenge of heritage practice. The sustainability of the operation of historic buildings ultimately means the preservation and appropriate use of the heritage fund. Fortunately, the list of such interventions that do not jeopardize the monumental values or the use of the building is gradually increasing. This is mainly due to modern, increasingly sophisticated materials and technologies. In this paper we offer a basic overview of the most frequently used and practice-tested interventions in historical buildings, but we focus on details.

Keywords

  • historical building
  • thermal insulation
  • cultural monument
  • buildings renovation
  • cultural heritage
Open Access

Green roof in module of climate chamber

Published Online: 31 Dec 2019
Page range: 75 - 80

Abstract

Abstract

The submitted article is devoted to the research of the green roofs located at Faculty of civil engineering of Technical University of Kosice. The aim of this research work is to improve the quality of integrated research of advanced building constructions with focusing on intelligent buildings and indoor technologies with respect on design and evaluation of design elements for the progressive buildings.

Keywords

  • green roof
  • climate chamber
Open Access

Environmental impact analysis of five family houses in Eastern Slovakia through a life cycle assessment

Published Online: 31 Dec 2019
Page range: 81 - 92

Abstract

Abstract

This study performs a life cycle assessment (LCA) of five new family houses in Eastern Slovakia to compare them in terms of the materials and technologies used. The main goal of the analysis is to investigate and highlight the expectable reduction rate of environmental impact resulting from using green materials and technologies. Their environmental impact is determined by using eToolLCD software. The life cycle impact assessment (LCIA) categories of global warming, ozone depletion, acidification, eutrophication and photochemical ozone creation potential are determined within the cradle-to-grave boundary. The examined family houses are built of conventional materials such as aerated concrete blocks, expanded polystyrene (EPS) for thermal insulation and roofing mineral wool, as well as natural materials such as clay, straw, wood, cellulose and vegetation for the roofs. Family houses built of natural materials are characterized by negative emissions of CO2eq in the product phase. Results show that especially the product phase contributes greatly to all environmental impact categories for houses built of conventional materials, such as aerated concrete blocks, mineral wool for thermal insulation, reinforcement concrete and ceramic or concrete tiles.

Keywords

  • Life cycle assessment (LCA)
  • Global warming potential (GWP)
  • Family house
  • Green materials
  • Green technologies
Open Access

Study on utilization of zeolite in concrete precast industry

Published Online: 31 Dec 2019
Page range: 93 - 102

Abstract

Abstract

Article contains experiment investigating influence of partial cement replacement by zeolite on consistency of fresh concrete, early compressive strength development and temperature development in early stages of curing. Four concrete mixture compositions were tested – containing zeolite in 0%, 5%, 10% and 15% of binder weight. Consistency was tested by flow table test in 5 minutes and 30 minutes after mixing of fresh concrete. Compressive strength and temperature gain were tested after 12, 16, 20 and 24 hours of curing. Results showed significant influence of zeolite on consistency of fresh concrete while compressive strength results were still in the acceptable range.

Keywords

  • zeolite
  • precast concrete
  • early strength development
  • flow table test
Open Access

Inlet device with double exponential profile distributor for indoor air dispensation

Published Online: 31 Dec 2019
Page range: 103 - 111

Abstract

Abstract

This paper presents a device for introducing air inside a room with the novelty of double-exponential profile of the distributor. This allows entering the rooms of large quantities of blow-in air with low velocities, with the result of possible use in locations with a high required air exchange. In the Laboratory of Ventilation and Air Conditioning of the Technical University of Cluj-Napoca, it was designed and built an experimental stand in order to investigate the velocity field of a double-equal strength (double exponential profile) inlet device for spatial air-distribution. There are presented the measurements that were performed in the laboratory in order to establish the velocity field and the spatial distribution of air. The proposed solution can be used in many applications to provide high rates of air through the ventilation systems.

Keywords

  • inlet device
  • air velocity
  • jet
  • distribution
  • movement
  • double exponential
  • spatial
Open Access

Deflection of concrete slabs with GFRP reinforcement caused by shrinkage

Published Online: 31 Dec 2019
Page range: 113 - 118

Abstract

Abstract

The use of new reinforcing materials and products in the construction industry requires their thorough assessment for a variety of design situations. One of the significant effects is the shrinkage of the concrete, which in the case of asymmetrically reinforced elements can cause the element to be deformed. The research was focused on slabs asymmetrically reinforced by composite reinforcement (GFRP) and by three reinforcement stages. To eliminate the effect of concrete non-homogeneity, a concrete slab of the same dimensions was made of the same concrete. The results show a significant effect of shrinkage on reinforced slabs.

Keywords

  • concrete shrinkage
  • slabs
  • deflection
  • steel and GFRP reinforcement
12 Articles
Open Access

Evaluating of daylighting in selected office room: Case of Study

Published Online: 31 Dec 2019
Page range: 7 - 15

Abstract

Abstract

On average, we spend 90% of our time indoor particularly at work and a healthy work space is essential to that feeling of wellbeing. In a typical building, lighting accounts for up to 40% of energy consumption. Allowing more natural light to penetrate the building and controlling both the light and heat components of power consumption, will result in significant reductions. However, using natural light doesn´t come without some issues. Glare, overheating, variability and privacy issues can all cause problems. Daylight is a basic human need, which is highlighted by the provision of transparent and translucent surfaces to all occupied spaces that we see around us. In many cases, the drive to create healthier, more occupant-conscious buildings works hand in hand with the requirement for greater energy efficiency. This article presents illumination of indoor workspace using daylight lighting. Measured values were compared with values calculated by simulation program Velux Daylight Visualizer 3.

Keywords

  • daylighting
  • glare
  • daylight factor
  • workspaces
  • illuminance
  • simulation
Open Access

Light Pipe Comparative Study

Published Online: 31 Dec 2019
Page range: 17 - 26

Abstract

Abstract

Results of daylight illuminance measurements of the field testing of two light guides with different roof installations is presented in the article. The first one is a common tubular system with a glass roof dome and the second one is a new light guide prototype with a concentrator head. The daylight illuminance was measured in a test chamber with the light guides installation. The measurements were carried out at the end of a summer season from August to September 2017. The measured data show differences in the daylight illuminance of the two tested light guides. The measured data were compared with simulation outputs in software Holigilm. In summary, it was found that the common light guide is about 37 percentage more efficient in light transmittance compared to the new light guide prototype. In temperate climate with dominant cloudy and partly cloudy daylight conditions the common light guide transmitted more light that the device with the concentrator head which reduced light transmission much more.

Keywords

  • light guide
  • light measurements
  • daylight evaluations
Open Access

Utilizing drone technology in the civil engineering

Published Online: 31 Dec 2019
Page range: 27 - 37

Abstract

Abstract

An unmanned aerial vehicle (UAVs), also known as drone technology, is used for different types of application in the civil engineering. Drones as a tools that increase communication between construction participants, improves site safety, uses topographic measurements of large areas, with using principles of aerial photogrammetry is possible to create buildings aerial surveying, bridges, roads, highways, saves project time and costs, etc. The use of UAVs in the civil engineering can brings many benefits; creating real-time aerial images from the building objects, overviews reveal assets and challenges, as well as the broad lay of the land, operators can share the imaging with personnel on site, in headquarters and with sub-contractors, planners can meet virtually to discuss project timing, equipment needs and challenges presented by the terrain. The aim of this contribution is to create a general overview of the use of UAVs in the civil engineering. The contribution also contains types of UAVs used for construction purposes, their advantages and also disadvantages.

Keywords

  • civil engineering
  • data capture
  • unmanned aerial vehicle
  • drone
  • aerial mapping
Open Access

The effect of CO2 on cement composites produced with an admixture of waste sludge water from a concrete plant

Published Online: 31 Dec 2019
Page range: 39 - 46

Abstract

Abstract

This article presents the results of a research dealing with the effect of CO2 on cement composites prepared on the basis of waste sludge water from the concrete plant. The designed formulas R1 and R3 use waste sludge water from the concrete plant as a partial or complete replacement of mixing water in the production of cement composites. The mixing water was replaced by waste sludge water in the amounts of 25%, 50%, 75% and 100%. Laboratory tests that are defined in ČSN EN 1008 standard were performed in order to determine the effect of partial or complete replacement of mixing water. The test specimens were further subjected to the effect of CO2 in the Lamart laboratory chamber, where the effect of CO2 was simulated for the period 50 years. Subsequently, the cement composites were tested for their strength characteristics (tensile flexural strength, compressive strength) and subjected to a mineralogical analysis. The results show that the effect of CO2 will reduce the strength characteristics of the composite compared to the comparative samples.

Keywords

  • accelerated carbonation of composite
  • replacement of mixing water
  • waste water from concrete plant
  • cement composites
  • tensile flexural strength
  • compressive strength
Open Access

Evaluation of concrete deterioration under simulated acid rain environment

Published Online: 31 Dec 2019
Page range: 47 - 54

Abstract

Abstract

Acid rain is identified as one of the most serious environmental problems nowadays and it is mainly a mixture of sulfuric and nitric acids. Deterioration of concrete structures exposed to aggressive acid rain attack is a key durability issue that affects the performance and maintenance costs of vital civil infrastructures. The motivation for understanding the acid rain corrosion process is high because of the early age deterioration of many concrete structures exposed to acid rain. The main objective of this study was to investigate the durability of concrete specimens with different supplementary cementitious materials, such as fly ash, zeolite and blast furnace slag against acid rain attack. Experiments of acid rain simulation influence on the composites were carried out for 7 weeks and parameters like visual changes, absorbability and leachability of calcium and silicon ions were evaluated. The increase in absorbability was detected for all samples while the sample with blast furnace slag was identified to be the most durable in this point of view. The most durable sample considering leached-out calcium and silicon ions was found to be sample with fly ash.

Keywords

  • concrete
  • supplementary cementitious materials
  • deterioration
  • acid rain
Open Access

Verification of building environmental assessment system for houses

Published Online: 31 Dec 2019
Page range: 55 - 66

Abstract

Abstract

Sustainable construction and its architecture of buildings seeks to minimize the negative environmental impact of buildings by efficiency in the use of materials, energy, and development space and the ecosystem at large. Sustainable buildings use a conscious approach to energy and ecological conservation in the design of the built environment in cities. This article is devoted to the environmental assessment of three family houses which represent three different material and design solutions. The houses were evaluated through the Slovak building environmental assessment system (BEAS), which has been developed for Slovak conditions at the Faculty of Civil Engineering, TUKE. This study shows that the influence of green design, compared to traditional construction, is important and more beneficial for the practice of designing sustainable buildings. It creates the most comprehensive relationship between the building and its environment and significantly affects building sustainability.

Keywords

  • House
  • environmental assessment
  • BEAS
Open Access

Selected problems of thermal insulation of historical buildings

Published Online: 31 Dec 2019
Page range: 67 - 74

Abstract

Abstract

There are problems with historical buildings when changing the thermal insulation properties of buildings. The Energy Efficiency Act exempted historic buildings from certification. Not all old, historic buildings have monument protection. It is necessary to take into account the above mentioned facts in case of renovation and reconstruction of an old building. Otherwise, a normal building is approached and a building of historical value is treated differently. Methods hidden insulation, which preserves the authenticity of cultural monuments and real estate in the heritage areas, is a current challenge of heritage practice. The sustainability of the operation of historic buildings ultimately means the preservation and appropriate use of the heritage fund. Fortunately, the list of such interventions that do not jeopardize the monumental values or the use of the building is gradually increasing. This is mainly due to modern, increasingly sophisticated materials and technologies. In this paper we offer a basic overview of the most frequently used and practice-tested interventions in historical buildings, but we focus on details.

Keywords

  • historical building
  • thermal insulation
  • cultural monument
  • buildings renovation
  • cultural heritage
Open Access

Green roof in module of climate chamber

Published Online: 31 Dec 2019
Page range: 75 - 80

Abstract

Abstract

The submitted article is devoted to the research of the green roofs located at Faculty of civil engineering of Technical University of Kosice. The aim of this research work is to improve the quality of integrated research of advanced building constructions with focusing on intelligent buildings and indoor technologies with respect on design and evaluation of design elements for the progressive buildings.

Keywords

  • green roof
  • climate chamber
Open Access

Environmental impact analysis of five family houses in Eastern Slovakia through a life cycle assessment

Published Online: 31 Dec 2019
Page range: 81 - 92

Abstract

Abstract

This study performs a life cycle assessment (LCA) of five new family houses in Eastern Slovakia to compare them in terms of the materials and technologies used. The main goal of the analysis is to investigate and highlight the expectable reduction rate of environmental impact resulting from using green materials and technologies. Their environmental impact is determined by using eToolLCD software. The life cycle impact assessment (LCIA) categories of global warming, ozone depletion, acidification, eutrophication and photochemical ozone creation potential are determined within the cradle-to-grave boundary. The examined family houses are built of conventional materials such as aerated concrete blocks, expanded polystyrene (EPS) for thermal insulation and roofing mineral wool, as well as natural materials such as clay, straw, wood, cellulose and vegetation for the roofs. Family houses built of natural materials are characterized by negative emissions of CO2eq in the product phase. Results show that especially the product phase contributes greatly to all environmental impact categories for houses built of conventional materials, such as aerated concrete blocks, mineral wool for thermal insulation, reinforcement concrete and ceramic or concrete tiles.

Keywords

  • Life cycle assessment (LCA)
  • Global warming potential (GWP)
  • Family house
  • Green materials
  • Green technologies
Open Access

Study on utilization of zeolite in concrete precast industry

Published Online: 31 Dec 2019
Page range: 93 - 102

Abstract

Abstract

Article contains experiment investigating influence of partial cement replacement by zeolite on consistency of fresh concrete, early compressive strength development and temperature development in early stages of curing. Four concrete mixture compositions were tested – containing zeolite in 0%, 5%, 10% and 15% of binder weight. Consistency was tested by flow table test in 5 minutes and 30 minutes after mixing of fresh concrete. Compressive strength and temperature gain were tested after 12, 16, 20 and 24 hours of curing. Results showed significant influence of zeolite on consistency of fresh concrete while compressive strength results were still in the acceptable range.

Keywords

  • zeolite
  • precast concrete
  • early strength development
  • flow table test
Open Access

Inlet device with double exponential profile distributor for indoor air dispensation

Published Online: 31 Dec 2019
Page range: 103 - 111

Abstract

Abstract

This paper presents a device for introducing air inside a room with the novelty of double-exponential profile of the distributor. This allows entering the rooms of large quantities of blow-in air with low velocities, with the result of possible use in locations with a high required air exchange. In the Laboratory of Ventilation and Air Conditioning of the Technical University of Cluj-Napoca, it was designed and built an experimental stand in order to investigate the velocity field of a double-equal strength (double exponential profile) inlet device for spatial air-distribution. There are presented the measurements that were performed in the laboratory in order to establish the velocity field and the spatial distribution of air. The proposed solution can be used in many applications to provide high rates of air through the ventilation systems.

Keywords

  • inlet device
  • air velocity
  • jet
  • distribution
  • movement
  • double exponential
  • spatial
Open Access

Deflection of concrete slabs with GFRP reinforcement caused by shrinkage

Published Online: 31 Dec 2019
Page range: 113 - 118

Abstract

Abstract

The use of new reinforcing materials and products in the construction industry requires their thorough assessment for a variety of design situations. One of the significant effects is the shrinkage of the concrete, which in the case of asymmetrically reinforced elements can cause the element to be deformed. The research was focused on slabs asymmetrically reinforced by composite reinforcement (GFRP) and by three reinforcement stages. To eliminate the effect of concrete non-homogeneity, a concrete slab of the same dimensions was made of the same concrete. The results show a significant effect of shrinkage on reinforced slabs.

Keywords

  • concrete shrinkage
  • slabs
  • deflection
  • steel and GFRP reinforcement

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