Investigation of Size Effect in Asphalt Mixture Fracture Testing at Low Temperature

摘要

The Semi-Circular Bending (SCB) fracture test is commonly used to evaluate thelow temperature fracture properties of asphalt mixtures. The present work investigates thepresence of size effect in SCB fracture testing of asphalt mixtures. Un-notched and notchedgeometrically similar SCB specimens of various sizes are tested at -24°C loaded by crackmouthopening displacement (CMOD). The effect of specimen size on the nominal strength isinvestigated through the well established size effect theories and conclusions are drawnregarding the fracture behaviour of mixtures at low temperature.