Quantative Evaluation of Mechanical Properties and Variation of Shotcrete From Early Age to Hardened State

Key Points

• The aim is to assess the mechanical properties of shotcrete from early age until it reaches a hardened state for tunnel seismic evaluations.
• Conducted material tests using cylindrical shotcrete samples from early age to hardened state.
• Quantified variability in mechanical properties such as compressive and tensile strength.
• Compared dry and wet spray methods regarding their impact on stiffness.
• Analyzed factors causing strength and stiffness reduction through CT imaging and mixture estimations.
• Acquired data on compressive strength and tensile strength, including previously limited data on splitting tensile strength.
• Confirmed that dry spray shotcrete has lower stiffness compared to wet methods.
• Quantified variations in strength metrics.