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Development of Fire Resistant Shotcrete with Olivine Aggregates
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<p>The objective of this research was the development of shotcrete mixtures with olivine aggregates that could act as protective coating in case of high temperature exposure, such as fire inside a tunnel.</p><p>Workability, unit weight, porosity, modulus of elasticity and compressive and flexural strength at the age of 7, 28 and 90 days of olivine-based concrete mixtures were tested and compared with reference mixtures with limestone aggregates and river sand. The residual mechanical properties of shotcrete mixtures were also measured after exposure to 400, 550, 750 and 850°C. Results showed that the replacement of limestone with olivine led to concrete superior in terms of strength at all temperatures of strain, indicating that the utilization of olivine-based shotcrete enables production of a fire resistant shotcrete at temperatures up to 850°C. The experimental procedure was completed with a successful pilot application of olivine-based shotcrete on concrete panels.</p>
International Association for Bridge and Structural Engineering (IABSE)
Title: Development of Fire Resistant Shotcrete with Olivine Aggregates
Description:
<p>The objective of this research was the development of shotcrete mixtures with olivine aggregates that could act as protective coating in case of high temperature exposure, such as fire inside a tunnel.
</p><p>Workability, unit weight, porosity, modulus of elasticity and compressive and flexural strength at the age of 7, 28 and 90 days of olivine-based concrete mixtures were tested and compared with reference mixtures with limestone aggregates and river sand.
The residual mechanical properties of shotcrete mixtures were also measured after exposure to 400, 550, 750 and 850°C.
Results showed that the replacement of limestone with olivine led to concrete superior in terms of strength at all temperatures of strain, indicating that the utilization of olivine-based shotcrete enables production of a fire resistant shotcrete at temperatures up to 850°C.
The experimental procedure was completed with a successful pilot application of olivine-based shotcrete on concrete panels.
</p>.
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