Properties of artificial aggregates fabricated with various heating conditions

The artificial aggregates were fabricated by using the inorganic wastes, dredged soil produced at a dredging work. The input temperature (800 similar to 1000 degrees C), output temperature (1100 similar to 1200 degrees C) and heating rate (5 similar to 10 degrees C/min) in sintering process were controlled to fabricate the aggregates with various value of density and water absorption, and their properties were analyzed as a function of those factors. The specimens sintered at the lower input temperature showed the higher density and the lower water absorption while those with higher input temperature had many pores inside of the aggregates, lower density and higher water absorption. Also increasing the input temperature accelerated the black core phenomenon in the aggregates. The bloating phenomena which the gigantic pores were generated inside the aggregates were improved as increasing the output temperature, but its effect was lower than that of input temperature. It could be realized that the bloating tendency was improved from the results that the density was increased and water absorption was decreased with increasing heating rate from 5 to 10 degrees C/min. It was found that the artificial aggregates of light or heavy weight with various value of density and water absorption could be fabricated by using dredged soils naturally involving gas and fluxing components by controlling the sintering conditions.