Evaluating Performance and Strength of Green Roller-Compacted Concrete

This study investigates the vertical resilient response, permanent deformation behavior, and shear strength of green Roller-Compacted Concrete (RCC). First, a permanent deformation test was conducted to determine the time within which the resilient behavior of RCC remains unaffected by cement hydration. Then, resilient modulus testing was performed to analyze the resilient response of RCC under various stress states. Finally, variable energy Dynamic Cone Penetrometer (VE-DCP) soundings were used to determine the shear strength properties of green RCC. The results demonstrate that the resilient modulus of the RCC remains constant up to 50 minutes, followed by a sudden increase in stiffness. Meanwhile, the permanent strain logarithmically increases and then stabilizes. However, the overall resilient modulus of the RCC remains lower than that of a well-compacted coarse aggregate base layer material. Furthermore, the resistance to penetration progressively increases over time, with a noticeable and rapid gain in cone tip resistance during the first hour of testing. Notably, around 25 minutes after mixing, an estimated average California Bearing Ratio (CBR) value of 30 is observed.