Interaction between Accelerating Admixtures and PortlandCement for Shotcrete: The Influence of the Admixture’sChemical Base and the Correlation between Paste Testsand Shotcrete Performance

This study analyzes the correspondance between initial and final setting times measured using Gillmore needles (commonly specified for shotcrete) with shooting stiffness-measured Proctor needles and compressive strength at early ages (evaluated using nondestructive penetration tests). Two different types of accelerating admixtures (carbonate and aluminate-based) and two different types of Portland cements were used in the tess on cement paste and shotcrete.