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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 1000ºC and 1200ºC 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. [Project   of the Serbian Ministry of Education, Science and Technological Development,   Grant no. III 45008 and OI 172057

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