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POZZOLANIC ACTIVITY OF SEWAGE SLUDGE ASH WITH RESPECT TO ITS CALCINATION AND CHEMICAL COMPOSITION

Zaleska, M.; Pavlikova, M.; Trnik, A.; Jankovsky, O.; Pavlik, Z.
Abstract:
The handling and disposal of voluminous sludge produced from water treatment plants poses difficulty to environmental scientist and engineers. In fact, its environmental friendly management and disposal is challenging task and requires careful consideration. In this study, sewage sludge ashes were examined as potentially supplementary cementitious materials. The raw sewage sludge was provided by two different municipal waste water treatment plants, coming from Poland and Greece respectively. The calcination of preliminary dried sewage sludge was done at 700 °C in order to remove organic matter that would negatively affect setting and hardening of cement blends. For both raw and thermally treated materials, chemical composition was studied using XRF. The morphology of sewage sludge ash was characterized by SEM and mineralogical composition was evaluated by XRD analyses. Calcination process was monitored by STA. The pozzolanic activity was analyzed by Frattini test and measurement of strength activity index of cement pastes, where sewage sludge substituted 10 % of Portland cement by mass. The both analyzed ashes contained silica, alumina, calcium and iron oxides in significant amounts. The high amorphous content resulted in a good pozzolanic activity and high strength activity index.
SGEM Research areas:
Year:
2017
Type of Publication:
In Proceedings
Keywords:
sewage sludge ash; supplementary cementitious materials; pozzolanic activity; strength activity index.
Volume:
17
SGEM Book title:
17th International Multidisciplinary Scientific GeoConference SGEM 2017
Book number:
62
SGEM Series:
International Multidisciplinary Scientific GeoConference-SGEM
Pages:
351-358
Publisher address:
51 Alexander Malinov blvd, Sofia, 1712, Bulgaria
SGEM supporters:
Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
Period:
29 June - 5 July, 2017
ISBN:
978-619-7408-13-3
ISSN:
1314-2704
Conference:
17th International Multidisciplinary Scientific GeoConference SGEM 2017, 29 June - 5 July, 2017
DOI:
10.5593/sgem2017/62/S26.045
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