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  Influence of composition parameters about characteristics tunnellining concrete subjected to high temperatures

  The objective of this experimental work is to investigate the fire performance of four concretes (named C1, C2, C3 and C4) made with different aggregates. C1 was made with land aggregates and C2, C3, C4 were made with dredged sediments. Physical and mechanical properties of all concretes were determined at temperatures of 20°C, 150°C, 350°C and 600°C. Results show that the concrete C3 has a compressive strength at 20°C higher than that of C1, C2 and C4. After the heating, we note the increasing of the weight loss as a function of temperature for all concretes. The porosity of concretes C1, C2 and C4 is higher than to the concrete C3 at all temperatures. The concrete C3 cooled in air has peak strength at 350°C more pronounced than that concretes C1, C2 and C4. The effect of high temperatures about the residual compressive strength of concretes is more pronounced when the concrete is subjected to the thermal shock in water than in air.

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