engleski

Post-cooling compressive behaviour of high- strength self-compacting concrete

Decades of research have shown that concrete structures can be severely damaged depending on the fire exposure temperature and duration, but in most cases can retain the essential part of their load-bearing capacity after fire exposure. To assess the damage to structures and propose repair measures, it is essential to evaluate the residual properties of the material composing the structural element. This paper presents the experimental investigation of the compressive stress-strain relationship for self-compacting concrete mixes with different binders before and after heating to high temperatures up to 800°C. Specimens were tested in uniaxial compression both under ambient conditions and after exposure to a predefined elevated temperature. The mechanical properties in terms of compressive strength, modulus of elasticity and strain at peak strength were calculated from stress-strain curves and compared with the values in the unheated condition. The results showed that for the tested mixes, the difference in residual mechanical properties can significantly vary depending on the type of binder used

self-compacting concrete, high temperatures, stress-strain curves, mechanical properties

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