A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The influence of combustion-derived pullutants on limestone deterioration: 2. The wet deposition of pollutant species
(Continued from Corrosion Science 38(96) 1, S. 105 -131). The wet deposition of combustion-derived atmospheric pollutant species, on to freshly cut or diesel-smoked Portland and Monks Park limestone and marble samples, was carried out in a 'wetting and drying' salt spray chamber for 84 days. Along with the effect of CO2-equilibrated de-ionized water at pH 5.5 for clean-rain base-line data, the relative effects of the Cl(-), SO4(2-) and NO3(-) components (5.2, 8.6 and 3.0 mg/l, respectively) of an artificial acid-rain solution were studied using spray run-off solution rates of 0.2 ml cm-2 day-1, and pH values of 5.5 and 3.8. The effects of exposure were followed by analysis for calcium and anions in the run-off solutions, and by analysis for anions in the stone samples after exposure, weighing and crushing. It was found that, at pH 5.5, water and solutions of individual anions gave similar recession rates within the range of 7.8+-1.8 and 11.5+-2.3 micrometer/yr for Portland and Monks Park limestones. At pH 3.8 the anion recession rates were increased to 11.1+-0.5 and 13.9+-0.5 micrometer/yr, similar to the rates of 12.5+-1.6 and 13.8+-2.2 micrometer/yr for the artificial acid rain solutiuon. Thus the water and hydrogen ion loading effects are significant, but the nature of the anion is not. The increased resistance of marble to calcium loss is probably due to its lower porosity. Any surface masking action (as smoke-coatings) depends upon particle size distribution.
The influence of combustion-derived pullutants on limestone deterioration: 2. The wet deposition of pollutant species
(Continued from Corrosion Science 38(96) 1, S. 105 -131). The wet deposition of combustion-derived atmospheric pollutant species, on to freshly cut or diesel-smoked Portland and Monks Park limestone and marble samples, was carried out in a 'wetting and drying' salt spray chamber for 84 days. Along with the effect of CO2-equilibrated de-ionized water at pH 5.5 for clean-rain base-line data, the relative effects of the Cl(-), SO4(2-) and NO3(-) components (5.2, 8.6 and 3.0 mg/l, respectively) of an artificial acid-rain solution were studied using spray run-off solution rates of 0.2 ml cm-2 day-1, and pH values of 5.5 and 3.8. The effects of exposure were followed by analysis for calcium and anions in the run-off solutions, and by analysis for anions in the stone samples after exposure, weighing and crushing. It was found that, at pH 5.5, water and solutions of individual anions gave similar recession rates within the range of 7.8+-1.8 and 11.5+-2.3 micrometer/yr for Portland and Monks Park limestones. At pH 3.8 the anion recession rates were increased to 11.1+-0.5 and 13.9+-0.5 micrometer/yr, similar to the rates of 12.5+-1.6 and 13.8+-2.2 micrometer/yr for the artificial acid rain solutiuon. Thus the water and hydrogen ion loading effects are significant, but the nature of the anion is not. The increased resistance of marble to calcium loss is probably due to its lower porosity. Any surface masking action (as smoke-coatings) depends upon particle size distribution.
The influence of combustion-derived pullutants on limestone deterioration: 2. The wet deposition of pollutant species
Einfluß von verbrennungsbedingten Schadstoffen auf die Kalkstein-Zerstörung: 2. Nasse Ablagerung der Schadstoff-Bestandteile
Johnson, J.B. (author) / Montgomery, M. (author) / Thompson, G.E. (author) / Wood, G.C. (author) / Sage, P.W. (author) / Cooke, M.J. (author)
Corrosion Science ; 38 ; 267-278
1996
12 Seiten, 9 Bilder, 57 Quellen
Article (Journal)
English
atmosphärische Bedingung , atmosphärische Korrosion , Verbrennung (Oxidation) , Schadstoff , Kalkstein , pH-Einfluss , Chlorid , Sulfat , Nitrat , Salzsprühprüfung , Gewichtsverlust-Zeit-Diagramm , chemische Analyse , Porosität , Röntgenbeugung , Konzentrationseinfluss , Feuchtigkeit , Wasseranalyse , Wasserkorrosion , Korrosionsgeschwindigkeit
| British Library Online Contents | 1996
| British Library Online Contents | 1996
Deterioration of Lesno Brdo limestone on monuments (Ljubljana, Slovenia)
| British Library Online Contents | 2010