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Ana Diana Ancas, M. Profire, I. L. Cirstolovean, M. Hornet and G. Cojocaru

Abstract

The lifetime of glass reinforced plastic pipes is 50 years. Extensive use of this type of pipe in its various applications, led to investigate their behavior in land that anthropogenic or natural causes, shows the different values of pH to neutral. The paper presents experimental results conducted on three samples of a PN SN10000 DN150 PN10 pipe buried in three different types of terrain: neutral, acidic, basic. They were subjected to axial load, measuring the force applied deformation force function. On the basis of the calculation formulas determined rigidity of the pipeline, the deformation speed of 50 mm / min. This concludes the type of land affects the rigidity of the pipe so its length of life decreases to that provided by suppliers in order to be taken compensatory measures in this regard such as choosing a higher class of pressure and stiffness pipeline than those arising discounted. This will allow for long-term value (50 years) in the mechanical characteristics sufficient for safe operation.

Open access

Jakub M. Gac and Monika Petelczyc

, Ghaffarpasand O. The effects of emission sources and meteorological factors on sulphur dioxide concentration of Great Isfahan, Iran. Atmos Environ. 2015;100:94-101. DOI: 10.1016/j.atmosenv.2014.10.012. [8] Meng Z-Y, Xu X-B, Wang T, Zhang X-Y, Yu X-L, Wang S-F, et al. Ambient sulfur dioxide, nitrogen dioxide, and ammonia at ten background and background sites in China during 2007-2008. Atmos Environ. 2010;44:2625-2631. DOI: 10.1016/j.atmosenv.2010.04.008. [9] Lee C, Martin RV, van Donkelaar A, Lee H, Dickerson RR, Hains JC, et al. SO 2 emissions and lifetimes

Open access

Magdalena Vaverková, Dana Adamcová, Jana Kotovicová and František Toman

;26(8):1049-1061. [4] Garthe JW, Kowal PD. Degradable Plastics, http://www.age.psu.edu/extension/factsheets/c/C15.pdf, Department of Agricultural and Biological Engineering, College of Agricultural Science, Penn State University, Pennsylvannia, 2002. [5] Chapman G. Compostable bag differences. BioCycle 1999. [6] Billingham NC, Wiles DM, Cermak BE, Gho JG, Hare CW, Tung JF. Controlled-lifetime environmentally degradable plastics based on conventional polymers. Addcon world 2000 (Basel, 25-26 October, 2000). International plastics additives and

Open access

Izabela Zimoch and Jolanta Szymik-Gralewska

Reliab. 1987;27:833-834. DOI: 10.1016/0026-2714(87)90330-1. [7] Kong J, Frangopol D. Sensitivity analysis in reliability-based lifetime performance prediction using simulation. J Mater Civ Eng. 2005;17:296-306. DOI: 10.1061/(ASCE)0899-1561(2005)17:3(296). [8] Kong J, Frangopol D. Cost-reliability interaction in life-cycle cost optimization of deteriorating structures. J Struct Eng. 2004;130:1704-1712. DOI: 10.1061/(ASCE)0733-9445(2004)130:11(1704). [9] Szymik-Gralewska J, Zimoch I. Optimization of the drinking water

Open access

Agnieszka Dołhańczuk-Śródka, Łukasz Wróbel, Andrzej Kłos and Maria Wacławek

, Miljanić ŠS. Radioactivity of sand from several renowned public beaches and assessment of the corresponding environmental risks. J Serb Chem Soc. 2009;74(4):461-470. DOI: 10.2298/JSC0904461R. [14] Taskin H, Karavus M, Ayb P, Topuzoglu A, Hidiroglu S, Karahan G. Radionuclide concentrations in soil and lifetime cancer risk due to gamma radioactivity in Kirklareli, Turkey. J Environ Radioact. 2009;100:49-53. DOI: 10.1016/j.jenvrad.2008.10.012. [15] Soil sampling for environmental contaminants. International Atomic Energy Agency, TECDOC-1415

Open access

Andreea Hegyi, M. Păstrav and M. Rus

Abstract

The implementation of the sustainable development concept is nowadays a key issue in almost all human activities. For the constructions domain an European strategy has already been elaborated. Among its goals are also the use of long lasting materials and the reduction of repair costs. This paper presents an interdisciplinary study concerning the efficiency of the use of hot-dip galvanized rebar for concrete structures. Experimental results about corrosion kinetics of coated and usual steel reinforcement embedded in concrete, subjected to chlorine ions attack, are analyzed. Electrochemical methods as chronoamperometry and linear polarization have been used. Corrosion potential values recorded for galvanized steel embedded in concrete indicate an uncertain corrosion activation process up to a rate of 2.5 % calcium chloride relative to concrete. For rates of 5% CaCl2 and more the corrosion process is activated. For unprotected steel bars embedded in concrete the corrosion activation process started at all calcium chloride studied rates and higher corrosion potential values has been registered than for the hot-dip galvanized ones, at the same rates. Economical assessments have been done using entire lifetime cost analysis of the reinforced concrete structures. Despite that the hot-dip galvanization is a rather expansive procedure, when taking into account the whole expected life span, the use of zinc coating proves to be efficient both from structural and financial approaches.

Open access

M. Drusa and J. Vlcek

Abstract

In the case of realized geotechnical monitoring (GTM) of reinforced retaining wall in difficult geological conditions is demonstrated the important role at realisation of transport infrastructures, which are often realized in insufficient quality due to inappropriate geotechnical parameters from survey works or not fitted well design of structure at certain conditions. This can result in large deformations of structure, or losing stability or structure life-time is very limited and remediation work is complicated and expensive. There was built on the modernized railway line Bratislava – Trenčín, closed to Zlatovce, overpass and connected road embankments on the route of first class I/61. Structure was designed as a bridge over the railway track before the northern portal of the railway tunnel Turecký vrch was open. A part of the embankment and overpass was a retaining wall reinforced by geosynthetics. The results of the geotechnical monitoring of this wall were afterwards simulated using finite element method (FEM) and results of this comparison are the scope of this article.