engleski

Recycling and reuse of waste building brick in cement composites

Construction waste is generated daily and in relatively large quantities and should be adequately cared for, which including the processing (recycling) and reuse. One way of disposing of waste materials is the addition to the cement. This paper investigates the use of waste building brick as partial replacement for Portland cement type CEM II. Cement was replaced by waste brick in different proportions (0, 5, 10, 15, 20, 25 and 30 wt. %). Samples were prepared with defined water/solid ratio W/S = 0, 5 and cured for 1, 2, 7, 14 and 28 days of hydration in thermostat at a constant temperature of 20 oC. The chemical composition and spectra of cement composites at anhydrous and hydrated state was studied by EDXRF device. Results show that incorporation of the pozzolanic addition (waste brick) in Portland cement changes the chemical composition of cement matrix. Further, it increases the content of silicon, aluminum and iron oxides but decreases the content of calcium oxide. Also, increasing the addition of waste brick affects the intensity XRF spectra.

waste building brick ; Portland cement ; hydration ; EDXRF ; XRF spectra

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