Ontario Ministry of Transportation

About: Ontario Ministry of Transportation is a government organization based out in Toronto, Ontario, Canada. It is known for research contribution in the topics: Poison control & Asphalt. The organization has 4652 authors who have published 3882 publications receiving 59011 citations.

Numerical modelling of corrosion – Theoretical backgrounds –

Abstract: During recent years research projects with different approaches have been carried out to develop models which are suitable to assess the metal removal rate in case of reinforcement corrosion. Some of them are based on empirical methods and correlate the corrosion rate to parameters like concrete resistivity, temperature and relative humidity. Another type of model is based on a quantification of the ongoing electrochemical processes. In this paper the theoretical backgrounds and mathematical descriptions of reinforcement corrosion with regard to a numerical modelling are presented and discussed.

Synthesis of the sednet work package 4 outcomes

Abstract: 1 Regione Emilia-Romagna, Responsabile servizio Tutela e Risanamento risorsa acqua, Via Dei Mille, Bologna, Italy 2 Technical University Hamburg-Harburg, Germany 3 Port of Rotterdam, Strategy and Communication Maritime Development, The Netherlands 4 Free and Hanseatic City of Hamburg, Dept. of Port and River Engineering, Germany 5 ICRAM, Italy 6 DEC NV, Belgium 7 ENEA, Italian Agency for new technologies and environment, Italy 8 AKWA Aquatic Sediment Expert Centre Ministry of Transport, Public Works and Water Management, The Netherlands 9 University of Bremen, Germany 10 ALTERRA Dept. of Water and the Environment, The Netherlands 11 Avd.leder, miljo Div. dir. environmental Engineering, Norway 12 ENVIS Srl, Via Fanin 48, 40127 Bologna, Italy 13 TNO, The Netherlands

Polychlorinated dibenzo‐P‐dioxin and dibenzofuran residues in estuarine and coastal north sea sediments: Sources and distribution

Abstract: Sediments from two depositional zones of the North Sea (the Wadden Sea and Oyster Grounds) and from the estuaries of the rivers Rhine, Meuse, Scheldt, Ems, and Humber were analyzed for polychlorinated dibenzofurans (PCDFs) and dibenzo-p-dioxins (PCDDs) using a congener-specific procedure. A simple grain-size correction procedure was utilized for the comparison of PCDF and PCDD concentrations in sediments from different origin. This procedure, which applies wet sieving of fresh sediment and isolating and analyzing the <63-μm grain-size fraction, was found to be appropriate for comparing levels of PCDFs and PCDDs in different estuarine and coastal sediments. PCDFs were more widely encountered than PCDDs in all sediments, except for the Ems-Dollard and the Humber estuary. The highest concentrations were found in the outflow sediments of the rivers Rhine and Humber. Concentrations up to 2,980 ng/kg PCDFs, principally 1,2,3,4,6,7,8-HpCDF and OCDF, and up to 1,760 ng/kg PCDDs, principally OCDD, were determined in the River Rhine sediments. Principal component analysis was used to visualize the compositional changes of PCDD and PCDF profiles in the sediments. Two-dimensional projections based on sample scores from the principal component models showed a marked influence of the River Rhine on the presence of these compounds in the western Wadden Sea and the Oyster Grounds. Based on a chemo-metric evaluation of chromatographic profiles of these coastal, estuarine and related freshwater sediments, we have deduced that these compounds originate primarily from industrial operation discharges, related to the production of chloroaliphatic compounds and the chloralkali industry along the River Rhine. The atmospheric deposition of combustion-generated PCDDs and PCDFs appeared significant only for remote marine environments.