Abstract
This study prepares volcanic ash (VA)-blast furnace slag (S) based alkali-activated materials (AAM) with the addition of ceramic waste for exposure to high temperatures (1000 °C). The temperature resistance of alkali-activated materials were described by measuring their surface morphology, gel structure and thermal damage degree, through NMR and UPV tests. At calcination temperature of 800 °C, the VA-based alkali-activated materials with ceramic waste shows ultrasonic velocity of 1962 m/s and a porosity of 17.30 %, indicating the prevention from gel structural collapse. As low calcination temperatures (≤600 °C), ceramic waste only functions as filler materials and reduces compressive strength of the alkali-activated materials. While at calcination temperature of 800 °C, there is an activity generated by the transformation of crystalline phases into amorphous phases in the ceramic waste, thus participates the alkali-activated reaction and increases compressive strength of the alkali-activated materials. At 1000 °C, the collapse of skeleton of the alkali-activated material is induced by thermal incompatibility of the matrix and thermal compression.
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