Abstract
In order to improve construction and production efficiency, and fully leverage the technical and economic advantages of continuous pouring and rapid rise of roller compacted concrete, the four-graded roller compacted concrete was widely used in hydraulic engineering. Based on the characteristics and testing methods of four-graded roller compacted concrete, the multiple sets, the effects of mix proportion, maximum particle size of coarse aggregate, and compaction degree were analyzed. The differences in construction technology between three-graded roller compacted concrete and four-graded roller compacted concrete were compared, and the more suitable construction technology parameters for four-graded roller compacted concrete were obtained. When the water consumption and vibrating compacted (VC) value are within the range of 71kg/m³~70kg/m³ and 3.5s ~ 6s, respectively, the VC value and air content of four-graded roller compacted concrete are optimal. Choose 30%~32% for sand ratio. The combination ratio of natural coarse aggregates (extra large: large: medium: small) adopts 25: 30: 25: 20. The VC value of 3.5s is suitable. After 6 times of heavy rolling and vibration rolling, the surface has a good slurry state, with a relative compaction degree exceeding 98%. The vibration force is 395kN, and the working speed is 1.0 ~ 1.5km/h. The suggestions as follows: when the layer thickness is 0.4m, the four-graded roller compacted concrete should be rolled twice without vibration, six times with vibration, and two times without vibration; When the layer thickness is 0.5m, the four-graded roller compacted concrete should be rolled twice without vibration, eight times with vibration, and two times without vibration.