Research on Mix Design and Construction Application of Roller Compacted Concrete in Base

Abstract

To address the problems of segregation, cracking, and poor flatness of the roller compacted concrete (RCC) used in the base of the construction, this research takes the Qinglian highway rehabilitation project as the research object. Based on the filling and wrapping method, the surplus parameters of cement slurry and the surplus parameters of mortar are introduced, and the method is used to design the mix ratio of RCC. The mixing ratios of the mixture were designed by the orthogonal test method. In this research, Vebe time, compactness, 28 days flexural strength, and compressive strength were used as the evaluation indicators for each mix ratio specimen. The test results show that the optimum Vebe consistency (VC) value is 33 s, which provides good compactivity; the degree of compaction is 98.5 %, which provides good workability; the appropriate amount of cement is 190 kg/m3, which not only meets the strength requirements but also reduces the occurrence of road distresses. This research combines the practical project with mixture ratio design and uses the indicators recommended in the design process to propose methods to reduce road quality problems and to provide a scientific basis for RCC construction control.