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Détails du magazine
Format
Magazine
eISSN
1338-3973
ISSN
1338-3973
Première publication
23 May 2011
Période de publication
4 fois par an
Langues
Anglais

Chercher

Volume 20 (2012): Edition 3 (September 2012)

Détails du magazine
Format
Magazine
eISSN
1338-3973
ISSN
1338-3973
Première publication
23 May 2011
Période de publication
4 fois par an
Langues
Anglais

Chercher

5 Articles
Accès libre

Modified clinoptilolite in the removal of iron and manganese from water

Publié en ligne: 08 Nov 2012
Pages: 1 - 8

Résumé

Abstract

It is necessary to treat water intended for drinking purposes in many cases to meet therequirements of the Regulation of the Government of the Slovak Republic No. 496/2010 onDrinking Water. There is a tendency to look for technology with new, more efficient andcost-effective materials and technologies. The goal of this study is to compare activatednatural zeolite known as clinoptilolite (rich deposits of clinoptilolite were found in theregion of East Slovakia Region in the 1980s) with the imported Greensand and Cullsorbmaterials in the removal of iron and manganese from water. The results obtained fromexperiments carried out at WTP Kúty prove that Klinopur-Mn is suitable for the removalof iron and manganese from water and is comparable with the imported materials.

Mots clés

  • Treatment of water
  • Removal of iron and manganese
  • Natural materials (Klinopur Mn
  • Greensand
  • Cullsorb M)
  • Modified Clinoptilolite
  • Water analysis
Accès libre

The use of the hot-ball method for observing the transport of moisture in porous stones

Publié en ligne: 08 Nov 2012
Pages: 9 - 14

Résumé

Abstract

The effect of moisture on materials leads to changes in their physical and chemicalproperties. Materials with different porosities are saturated by various mechanisms. Thispaper is focused on water transport or diffusion in various porous structures. The Hot-BallMethod is used for determining the water content in certain parts of a specimen. Theprocess of water transport or water diffusion is closely related to a porous structure.Porosity affects the transport properties of a material; therefore, knowledge of themechanisms distributing the water in materials with different porosities is very important.The measurements were carried out by thermal conductivity sensors (hot-ball sensor)located in different positions along the path of the water’s movement. The principle of thehot-ball sensor (thermal conductivity sensor) is based on the Hot-Ball Method formeasuring thermal conductivity. The local moisture content and local temperature ofa porous stone is inspected using the Hot-Ball Method, where the measured values of thethermal conductivity are correlated with the water content. The experimental set up for theinvestigation of the water diffusion in stones is described.

Mots clés

  • Thermal conductivity
  • Moisture
  • Water diffusion
  • Thermal conductivity method
  • Porous materials.
Accès libre

Experimental investigation of reinforced concrete beams with and without CFRP wrapping

Publié en ligne: 08 Nov 2012
Pages: 15 - 26

Résumé

Abstract

This paper presents the results of experimental investigations on six reinforced concretebeams, with three different shear span-to-depth ratios, which were tested under two-pointloading. The aim of the work was to study the efficacy of Carbon Fibre Reinforced Polymer(CFRP) strips in enhancing shear capacity and/or changing the failure mode from brittleshear failure to ductile flexural failure. The results of the study indicate that while thereis a marginal increase in first crack and ultimate loads, it is possible to achieve a changein the failure mode, and the monitored strain gauge data can be used to explain the failurepattern observed.

Mots clés

  • Reinforced concrete
  • Carbon fibre
  • Shear strength
  • Failure mode
  • Cracking load
  • Ultimate load
Accès libre

Application of sensitivity and uncertainty analyses in the calculation of the heat transfer coefficient of a window

Publié en ligne: 08 Nov 2012
Pages: 27 - 34

Résumé

Abstract

The type of analysis we choose to use depends on exactly what we intend to explore. TheMonte Carlo (MCA) method, which can be applied to a sensitivity analysis (SA) and anuncertainty analysis (UA), is based on the random selection of a random variablegenerated by all the input parameters X. This paper discusses a realistic model ofa window and is focused on the uncertainties of the input and a sensitivity analysis of theoutput parameters - a window is a heat transfer coefficient. A case study is described toevaluate the necessity of the use of uncertainty and sensitivity analyses.

Keywords

  • Sensitivity analysis
  • Uncertainty analysis
  • Monte Carlo (Latin hypercube sampling)
  • Morris method.
Accès libre

A review of fuzzy risk assessment models for construction projects

Publié en ligne: 08 Nov 2012
Pages: 35 - 40

Résumé

Abstract

Risk modeling and analysis is one of the most important stages in a project`s success.There are many approaches for risk assessment, and an investigation of existing methodshelps in developing new models. This paper is an extensive literature survey in riskmodeling and analytic methods with a main focus on fuzzy risk assessment.

Mots clés

  • Risk modeling
  • Fuzzy risk assessment
  • Project risk.
5 Articles
Accès libre

Modified clinoptilolite in the removal of iron and manganese from water

Publié en ligne: 08 Nov 2012
Pages: 1 - 8

Résumé

Abstract

It is necessary to treat water intended for drinking purposes in many cases to meet therequirements of the Regulation of the Government of the Slovak Republic No. 496/2010 onDrinking Water. There is a tendency to look for technology with new, more efficient andcost-effective materials and technologies. The goal of this study is to compare activatednatural zeolite known as clinoptilolite (rich deposits of clinoptilolite were found in theregion of East Slovakia Region in the 1980s) with the imported Greensand and Cullsorbmaterials in the removal of iron and manganese from water. The results obtained fromexperiments carried out at WTP Kúty prove that Klinopur-Mn is suitable for the removalof iron and manganese from water and is comparable with the imported materials.

Mots clés

  • Treatment of water
  • Removal of iron and manganese
  • Natural materials (Klinopur Mn
  • Greensand
  • Cullsorb M)
  • Modified Clinoptilolite
  • Water analysis
Accès libre

The use of the hot-ball method for observing the transport of moisture in porous stones

Publié en ligne: 08 Nov 2012
Pages: 9 - 14

Résumé

Abstract

The effect of moisture on materials leads to changes in their physical and chemicalproperties. Materials with different porosities are saturated by various mechanisms. Thispaper is focused on water transport or diffusion in various porous structures. The Hot-BallMethod is used for determining the water content in certain parts of a specimen. Theprocess of water transport or water diffusion is closely related to a porous structure.Porosity affects the transport properties of a material; therefore, knowledge of themechanisms distributing the water in materials with different porosities is very important.The measurements were carried out by thermal conductivity sensors (hot-ball sensor)located in different positions along the path of the water’s movement. The principle of thehot-ball sensor (thermal conductivity sensor) is based on the Hot-Ball Method formeasuring thermal conductivity. The local moisture content and local temperature ofa porous stone is inspected using the Hot-Ball Method, where the measured values of thethermal conductivity are correlated with the water content. The experimental set up for theinvestigation of the water diffusion in stones is described.

Mots clés

  • Thermal conductivity
  • Moisture
  • Water diffusion
  • Thermal conductivity method
  • Porous materials.
Accès libre

Experimental investigation of reinforced concrete beams with and without CFRP wrapping

Publié en ligne: 08 Nov 2012
Pages: 15 - 26

Résumé

Abstract

This paper presents the results of experimental investigations on six reinforced concretebeams, with three different shear span-to-depth ratios, which were tested under two-pointloading. The aim of the work was to study the efficacy of Carbon Fibre Reinforced Polymer(CFRP) strips in enhancing shear capacity and/or changing the failure mode from brittleshear failure to ductile flexural failure. The results of the study indicate that while thereis a marginal increase in first crack and ultimate loads, it is possible to achieve a changein the failure mode, and the monitored strain gauge data can be used to explain the failurepattern observed.

Mots clés

  • Reinforced concrete
  • Carbon fibre
  • Shear strength
  • Failure mode
  • Cracking load
  • Ultimate load
Accès libre

Application of sensitivity and uncertainty analyses in the calculation of the heat transfer coefficient of a window

Publié en ligne: 08 Nov 2012
Pages: 27 - 34

Résumé

Abstract

The type of analysis we choose to use depends on exactly what we intend to explore. TheMonte Carlo (MCA) method, which can be applied to a sensitivity analysis (SA) and anuncertainty analysis (UA), is based on the random selection of a random variablegenerated by all the input parameters X. This paper discusses a realistic model ofa window and is focused on the uncertainties of the input and a sensitivity analysis of theoutput parameters - a window is a heat transfer coefficient. A case study is described toevaluate the necessity of the use of uncertainty and sensitivity analyses.

Keywords

  • Sensitivity analysis
  • Uncertainty analysis
  • Monte Carlo (Latin hypercube sampling)
  • Morris method.
Accès libre

A review of fuzzy risk assessment models for construction projects

Publié en ligne: 08 Nov 2012
Pages: 35 - 40

Résumé

Abstract

Risk modeling and analysis is one of the most important stages in a project`s success.There are many approaches for risk assessment, and an investigation of existing methodshelps in developing new models. This paper is an extensive literature survey in riskmodeling and analytic methods with a main focus on fuzzy risk assessment.

Mots clés

  • Risk modeling
  • Fuzzy risk assessment
  • Project risk.

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