The colour potentials of SSA-containing mortar: the long version

Annemette Kappel, Lisbeth M. Ottosen, Gunvor Marie Kirkelund, Anja Margrethe Bache, Per Goltermann

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This paper reports an experimental study of aesthetical qualities of mortar containing sewage sludgeash (SSA). SSA is the residue produced at water treatment plants where incineration of the sludge is applied in order to decrease volume and to prevent pathogens from spreading. Today SSA is with a few exceptions landfilled and thus, wasted.The purpose of the experiments was to examine the influence of SSA and how it affected the colour of mortar samples. SSA was ground in 6 different intervals and added to mortar mixes by replacing 20% of the cement. An additional focus was to examine the possibilities to accentuate the colours of the hardened mortar by using paper cuttings in the production of the samples. The result of the experiments showed that a colour scale can be developed from ground SSA, and that paper may have the potential of providing divers textural qualities when it is used in combination with other form materials.
Original languageEnglish
Title of host publicationFib Symposium Proceedings : Concrete - Innovation and Design
EditorsH. Stang, M. Bræstrup
Number of pages6
Publication date2015
Publication statusPublished - 2015
EventFib Symposium 2015 : Concrete - Innovation and Design - Copenhagen, Denmark
Duration: 18 May 201520 May 2015


ConferenceFib Symposium 2015
Internet address


  • Sewage sludge ash
  • Colour potentials
  • Mortar
  • Textures


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