Making Solutions for Choosing Industrial Concrete Floors and Expedience of Reliability Evaluation

Medeliene, Violeta; Žiogas, Vigantas Antanas

doi:10.3846/jcem.2010.37

Cited by 3 publications

(3 citation statements)

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“…Svarbiausias vaidmuo čia tenka matematiniams metodams. Jie leidžia efektyviau spręsti statybos darbų vykdymo klausimus ir parengti racionalius statybos darbų vykdymo projektinius sprendimus (Peldschus, Zavadskas 1997;Janušaitis, Juodis 2001;Juodis, Apanaviciene 2003;Viliuniene, Juodis 2002;Zavadskas et al 2005;Malinauskas, Kalibatas 2005;Viliūnienė, Viliūnas 2005;Viliuniene, Viliunas 2007;Žiogas, Juočiūnas 2005;Janusz, Kapliński 2006;Zavadskas et al 2008Zavadskas et al , 2009Šiškina et al 2009;Medeliene, Ziogas 2010;Peldschus et al 2010). Praktinis tokių sprendimų įgyvendinimas vykdant statybos darbus leistų sumažinti statybos išlaidas 15-25 %, statybos trukmę -16-28 % (Viliūnienė, Viliūnas 2005).…”

Section: įVadasunclassified

Statybos Vykdymo Planavimas Inžinerinio Pasirengimo Statybai Sistemoje

Viliūnienė

Inokaitytė

2011

Statybinės Konstrukcijos ir Technologijos

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The article analyzes an efficient method for planning the execution of construction work. Construction companies are looking for ways to reduce the essential factors in executing the construction work project, i.e. cost and time influencing the forthcoming company’s operating results are offered to perform engineering pre-construction activities. Engineering pre-construction is a set of technical, legal, economic, technological and organisational measures that shall ensure a consistent start of construction and a rhythmical organisation of major construction works employing optimum technology. Engineering pre-construction provides great potential for working out rational design solutions with respect to the execution of construction works applying a range of methods for assessing the aforesaid solutions. In this case, mathematical methods play the main role. Mathematical methods enable more effective tackling of the execution issues of construction works as well as developing rational design solutions with respect to the execution of construction works (Janušaitis, Juodis 2001; Juodis, Apanaviciene 2003; Viliuniene, Juodis 2002; Malinauskas, Kalibatas 2005; Viliūnienė, Viliūnas 2005; Viliuniene, Viliunas 2007; Žiogas, Juočiūnas 2005; Janusz, Kapliński 2006; Zavadskas et al. 2009; Šiškina et al. 2009; Medeliene, Ziogas 2010). Practical implementation of such solutions in the course of executing construction works would allow cutting down construction costs and construction time by 15–25% and 16–25% respectively (Viliūnienė, Viliūnas 2005). Besides, the rapid development of computer technology enables both faster preparation of rational design solutions to construction works through the application of mathematical methods and integration thereof into special software packages designed for construction management. Therefore, contractors should realise the significance of engineering pre-construction that is especially important to the execution of expensive large-scale projects. The process of construction execution should be improved applying the project management technique that helps to achieve the set goal within a limited time and with the optimum usage of limited resources. The objective of project management is to plan, organise and control project resources in order to implement the goals of the project. Hence, engineering pre-construction should be considered as an individual construction project stage acting as an engine for planning construction execution, organisation and control, thereby enabling a construction company to focus on profitable results. The article presents the methodology for preparing design solutions to the execution of construction work, which is adapted to handle the practical issues of engineering a pre-construction stage. The execution of complex earth works has been chosen as the subject matter of research.

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Section: įVadasunclassified

Statybos Vykdymo Planavimas Inžinerinio Pasirengimo Statybai Sistemoje

Viliūnienė

Inokaitytė

2011

Statybinės Konstrukcijos ir Technologijos

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“…The corrosive degradation of reinforced concrete structures [1-3] presents a real threat to their safe use and the reliability [4], [5]. Thus, the competence for assessing the corrosion risk properly and taking proper repair actions if necessary, is extremely important [6-10].…”

Section: Introductionmentioning

confidence: 99%

Investigation and Modelling of the Impact of Reinforcement Diameter in Concrete on Shapes of Impedance Spectra

Jaśniok

2013

Procedia Engineering

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The impedance test results of the steel reinforcement of various diameters, which was passivated and corroded in concrete specimens, were analysed. The impedance plots clearly indicated the tendencies for spectra shapes of steel rebars to change depending on their diameters. A 3-dimensional model of steel-concrete system was developed to explain the observed effect. This system was composed of the identical electrical equivalent circuits connected in parallel. Each equivalent scheme was characteristic for a theoretical conductive path during the measurement, which was defined between a counter-electrode and the reinforcement. This model was used with the rectangular counter electrode to simulate the formation of impedance spectra characteristic for a single reinforcing bar with the concrete cover of any thickness, a variable diameter and a variable polarization area. The simulation modelling the impact of various reinforcement diameters verified the tendencies for impedance spectra of steel in concrete to change their shapes. The improved of fitting quality of the model spectra to the experimental ones were obtained by considering in that model the moisture content in concrete. IntroductionThe corrosive degradation of reinforced concrete structures [1-3] presents a real threat to their safe use and the reliability [4], [5]. Thus, the competence for assessing the corrosion risk properly and taking proper repair actions if necessary, is extremely important [6-10]. The application of the polarization techniques [11] and particularly the method of impedance spectroscopy for assessing the corrosion rate of the reinforcement in the reinforced concrete structures encounters considerable difficulties [12]. These problems are related to complex measurement conditions and the complicated testing system. The studies are carried out using the potentiostat in a three-electrode system, in which the structure reinforcement (made of long steel bars) serves as the working electrode, and the electrode of known and satisfactory reversible potential serves as the reference electrode. The counter-electrode is applied to the surface of the reinforced concrete element to make the reinforcement polarization possible. The counter-electrode along with the reference electrode in a single enclosure formed the so called measuring head. The use of the head created a situation considerably different from the laboratory conditions form the measurement in an electrochemical vessel in which the large counter electrode uniformly polarizes the small tested electrode of a simple geometry. Regarding the measurements on the reinforcement in the reinforced concrete elements, the area of the tested electrode was significantly larger than that of the counter electrode applied to concrete. This resulted in the very non-uniform polarization of steel rebars. Moreover, the polarization area of the reinforcement required for assessing the rate of the electrochemical processes was unknown. The additional counter electrode in a form of a guard ring reducing the...

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“…Strict requirements are applied for this type of roofing. Roof coating shall be watertight in order to prevent the roof structural elements from corrosion and erosion, be able to bear vehicle loads (Medeliene, Žiogas 2010), the roof spaces in use must be safe for traffic participants and, of course, be aesthetically attractive. Similar problems may arise while exploiting green roofs, which can be installed for both the aesthetic and economic reasons.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Waterproofing Defects and Technology Development for Car Parking Roofs: Lithuanian Case

Ustinovichius

Rasiulis

Ignatavičius

et al. 2012

Journal of Civil Engineering and Management

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This work presents the analysis of installation options of exploitable car park roofs offered by the designers, material manufacturers and suppliers and introduces the Lithuanian legislation with the requirements for this type of roofing. Reasons of the most frequently occurring defects have been examined and several options for correcting defects have been provided. The most cost-effective option for correcting the defect in question has been chosen. Practical measures for increasing the reliability of exploitable car park roofs have been proposed. The analysis has shown that at a minimum slope reliability of the exploitable roof coated with roller heat-welded materials is not guaranteed. The authors propose to tighten the requirements on car park roofing.

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Making Solutions for Choosing Industrial Concrete Floors and Expedience of Reliability Evaluation

Cited by 3 publications

References 21 publications

Statybos Vykdymo Planavimas Inžinerinio Pasirengimo Statybai Sistemoje

Statybos Vykdymo Planavimas Inžinerinio Pasirengimo Statybai Sistemoje

Investigation and Modelling of the Impact of Reinforcement Diameter in Concrete on Shapes of Impedance Spectra

Analysis of Waterproofing Defects and Technology Development for Car Parking Roofs: Lithuanian Case

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