Details

Autor(en) / Beteiligte

• Godoy, Luis Gabriel Graupner de
• Rohden, Abrahão Bernardo
• Garcez, Mônica Regina
• Costa, Eugênio Bastos da
• Da Dalt, Silvana
• Andrade, Jairo José de Oliveira

Titel

Valorization of water treatment sludge waste by application as supplementary cementitious material

Ist Teil von

• Construction & building materials, 2019-10, Vol.223, p.939-950

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2019

Link zum Volltext

Quelle

ScienceDirect

Beschreibungen/Notizen

• •WTS waste used as raw material to the production of new SCM.•WTS waste processed by flash calcination and electrical muffle furnace.•Different temperature and residence time investigated.•Characterization performed to verify the potential pozzolanic activity.•Calcined WTS shows great potential to the production of a new SCM. This paper investigates the potential of using calcined water treatment sludge to the development of supplementary cementitious material. Sludge samples have been collected in the drying beds of a water treatment plant located in Southern Brazil and calcined in the laboratory. Chemical and mineralogical characterization has been performed through energy dispersive X-ray spectrometry, thermogravimetric analysis, and X-ray diffraction with crystalline phases quantified by Rietveld refinement. Morphological analysis has been supported by scanning electron microscope images. Physical characterization has been carried out through specific surface area, particle size distribution, and pozzolanic activity performance with Portland cement. Results have shown that the water treatment sludge is a non-hazardous and non-inert waste without environmental restrictions for use in construction. Considering technical, environmental and economic aspects related to energy consumption, sludge samples calcined at 600 °C for 1 h present the most promising results regarding the production of supplementary cementitious material equivalent to a normal pozzolan, while highly active pozzolan requires 750 °C for 1 h. Calcined water treatment sludge showed great technical and environmental potential to be used as an alternative source of supplementary cementitious material in the near future.