Tomasz Gawenda*, Zdzisław Naziemiec**, Alina Walerak***
*AGH Akademia Górniczo-Hutnicza
**Instytut Ceramiki i Materiałów Budowlanych, Kraków
***AGH Akademia Górniczo-Hutnicza
The aim of the paper was to present the possibilities of ceramic waste utilization towards the artificial aggregaters and concretes production. The investigations covered the waste comminution experiments at AGH in two-stage circuits with jaw and roll crushers, and particle size analyses. Experiments in ICMB Institute in Cracow included a determination of the water absorption index, comminution resistance and frost-resistance coefficients, as well as the bulk density. Two types of concretes were compared, the one produced with the participation of ceramic waste, and the other, produced from Devonian limestone. The aggregates produced from ceramic waste had an unfavorable particle shape. Jaw crushers on the first and second stage produced 63 and 22% of irregular particles respectively, while the roll crusher on second stage only 14%. The plant production aggregates from the waste should therefore be based on a closed multi-stage crushing and classification circuits with processing of aggregates. Ceramic waste crushing should be performed in devices producing cubical products, like impacrtors. These methods allow to obtain the aggregates with the smallest flatness indices and without pollution. The high water absorption, lower comminution and frost resistance of concretes are further unfavorable properties of aggregates produced from the ceramic waste. Unfavorable rheological properties of the concrete mixtures, resulting from the impact of the aggregate disadvantages can be improved by the use of hydrophobic additives which reduce the water absorption, thereby increasing water resistance of concrete. Artificial aggregate concrete had a lower compressive strength (about 33 MPa) than the natural concrete (about 49 MPa). Decrease in compressive strength of the artificial aggregate concrete subjected to freezing and defrosting cycles was 18.3%, which is a relatively high and negative. Summing up, the ceramic waste after a prior processing can be applied in the building industry. After a precise examination of the properties of artificial aggregates and application of suitable additives, they can be alternatively used in concrete production, particularly under conditions in which there is no impact of temperatures below zero degrees.
właściwości kruszyw; odpady ceramiczne
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