Materials and Structures

, Volume 31, Issue 7, pp 480–486 | Cite as

Effects of carbonaceous particles and heavy metals on mortar-SO2 reactions

  • G. Zappia
  • C. Sabbioni
  • G. Gobbi
Scientific Reports

Abstract

The effects of carbonaceous particles and heavy metals in the interaction between sulfur dioxide and mortars were investigated in a laboratory exposure system. Simulation experiments were carried out in a flow chamber where temperature, relative humidity and SO2 concentration were controlled. Samples of lime, pozzolan and cement mortars were exposed for 150 days in air with 3 ppm of SO2 concentration at 25°C and 95% RH. The mortar specimens were coated with three types of carbonaceous particles, collected at the emission points of three oil-fueled combustion sources, and, for comparison, with particles of active carbon, pure graphite, iron oxide and vanadium oxide. After exposure, the mortar samples were analyzed by x-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) to identify the main chemical species, by ion chromatography (IC) to quantify SO 4 −− and SO 3 −− concentration and also by scanning electron microscope (SEM). The results show that the amount of SO 4 −− forming increases in the presence of carbonaceous particles and is related to their heavy metal content.

Keywords

Gypsum Sulfite Soot Particle Cement Mortar Vanadium Oxide 

Résumé

Nous avons étudié les effets des particules carbonées et des métaux lourds sur l'interaction entre le dioxyde de soufre et les mortiers, par un système d'exposition en laboratoire. Des simulations ont été menées dans un réacteur en contrôlant la température, l'humidité relative et la concentration en SO2. Des échantillons de mortier de chaux, de pouzzolane et de ciment ont été exposés pendant 150 jours dans une atmosphère ayant une concentration en SO2 de 3 ppm, à 25°C et à 95% d'humidité relative. Les échantillons de mortier ont été enduits de trois types de particules carbonées, provenant des points d'émission de trois sources de combustion à base de mazout, ainsi que, pour comparaison, des particules de charbon actif, de graphite pur, d'oxyde de fer et d'oxyde de vanadium. Après exposition, les échantillons de mortier ont été analysés par diffraction, aux rayons X (XRD) et par spectroscopie infrarouge à transformée de Fourier (FTIR), afin d'identifier les principales espèces chimiques; par chromatographie ionique (IC) afin de quantifier les concentrations en SO 4 −− et SO 3 −− ; et par microscopie électronique à balayage (SEM). Les résultats montrent que la quantité de SO 4 −− formée augmente en présence de particules carbonées et qu'elle est liée à leur teneur en métaux lourds.

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Copyright information

© RILEM 1998

Authors and Affiliations

  • G. Zappia
    • 1
    • 2
  • C. Sabbioni
    • 2
  • G. Gobbi
    • 1
  1. 1.Dip. Scienze dei Materiali e della TerraUniversità di AnconaItaly
  2. 2.Ist. FISBAT-CNRBolognaItaly

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