Application of ultrasonic models for investigating the properties of the interface between roller compacted concrete (RCC) layers

Abstract

In this paper, a comprehensive set of linear and nonlinear ultrasonic techniques was performed to investigate the properties of the interface between the roller-compacted concrete (RCC) layers. The effect of different time intervals between the pouring of each layer, cement content of concrete and bedding mortar, and various curing periods on RCC specimens were studied in this research. In linear methods, the interlayer led to velocity dispersion and attenuation phenomena except for the inherent inhomogeneity of specimens. The nonlinear parameters showed a general upward at the earlier ages, while the linear methods did not show an apparent regularity. The ultimate strength results were then measured and utilized to assess the accuracy of ultrasonic methods. Models were developed to show the correlation between the mixture design and experimental measurements. Bayesian linear regression was then proposed to estimate the strengths of RCC.