Abstract
This paper aims the evaluation of water absorption and compressive strength of calcined clay lightweight aggregates produced using alkaline activators. The characterization of ceramic material was made by techniques of liquid and plasticity limits, particle size analysis and chemical analysis. The specimens made from these ceramic materials and alkali activators (potassium silicate, sodium silicate with NaOH (15M), phosphoric acid, sodium silicate, potassium hydroxide and sodium hydroxide) were burned at temperatures of 600 °C and 900 °C and they were characterized by evaluation of water absorption and compressive strength. Results of this research indicates that the burn temperature has influence on the final properties of calcined clay lightweight aggregates and, when this aggregates were made using some activators, as sodium silicate, they presented lower values of water absorption and higher values of compressive strength, for both burn temperature, which can generate significant energetic gain in the aggregates production process).
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