Effect of cooling rate on the mechanical behavior of heated Strathbogie granite with different grain sizes

• Water quenching has more influence on granite rocks with larger grain size.
• Slowly-cooled rock specimens have longer stable crack propagation regions than rapidly-cooled rocks.
• Rapid cooling influences the stress threshold of medium-grained granite.
• Either grain size or porosity can individually affect the stress at which new cracks are initiated at different cooling stages.