Sintering of fly ash based composites with zeolite and bentonite addition for application in construction materials

Due to pozzolanic characteristics, fly ash is commonly used as a cement replacement in construction composites. Addition of natural clays with sorption ability (i.e. zeolite and bentonite) in to the fly ash based construction materials is of both scientific and industrial interest. Namely, due to th...

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Bibliographic Details
Published in:Science of sintering 2017-01, Vol.49 (1), p.23-37
Main Authors: Terzic, Anja, Djordjevic, Natasa, Mitric, Miodrag, Markovic, Smilja, Djordjevic, Katarina, Pavlovic, Vladimir
Format: Article
Language:English
Subjects:
Bentonite
Cements
construction composite
Construction materials
density
DTA
Fly ash
sem
Sintering
Sorption
thermal behavior
Thermal properties
XRD
Zeolites
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Summary:Due to pozzolanic characteristics, fly ash is commonly used as a cement replacement in construction composites. Addition of natural clays with sorption ability (i.e. zeolite and bentonite) in to the fly ash based construction materials is of both scientific and industrial interest. Namely, due to the application of sorptive clay minerals, it is possible to immobilize toxic heavy metals from the composite structure. The thermal compatibility of fly ash and zeolite, as well as fly ash and bentonite, within the composite was observed during sintering procedure. The starting components were used in 1:1 ratio and they were applied without additional mechanical treatment. The used compaction pressure for the tablets was 2 t?cm-2. The sintering process was conducted at 1000?C and 1200?C for two hours in the air atmosphere. The mineralogical phase composition of the non-treated and sintered samples was analyzed using X-ray diffraction method. Scanning electron microscopy was applied in the analysis of the microstructure of starting and sintered samples. The thermal behavior was observed via DTA method. The influence of temperature on the properties of fly ash-zeolite and fly ash-bentonite composites was investigated.
ISSN:0350-820X
1820-7413
DOI:10.2298/SOS1701023T