Reflection cracking is a common distress in asphalt overlays on cracked concrete pavements. Rubblization, which can minimize reflection cracks, has been used as an efficient rehabilitation method for aged concrete pavements in the United States. When applying the rubblization method, it is typical for the upper layer of aged concrete pavement to be rubblized to 40–70 mm in size, while the lower layer of the aged concrete pavement remains at a larger size, often over 300 mm . For thick concrete slabs, it is difficult to rubblize the entire depth of thick concrete slabs in terms of both construction and cost. The high impact energy necessary to rubblize the entire depth may cause degradation of the structural capacity of the pavement substructure. Korean highways are typically paved with thick concrete pavement slabs ( 30–33 cm concrete slabs with 15 cm lean concrete bases on granular subbases). This study conducted in Korea determined the minimum depth of effective 40–70 mm size rubblization to deter a ref...