Abstract
This experimental research provides a comprehensive study of the evolution of the mechanical behavior between 20 °C and 600 °C of semi-structural insulating lightweight aggregate concretes with density lower than 1.2 and demonstrates their viability. Very lightweight concretes are obtained by a total substitution of fine and coarse expanded clay aggregates. The compressive and tensile strength, Young modulus and Poisson ratio are determined after heating up to 600 °C, with compression tests monitored using an acoustic emission acquisition system. The results showed a softening in fracture behavior starting at 300 °C. The Kaiser effect is observed at 150 °C as early as 30% of fcmax, indicating irreversible damage.
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