道路施工设备(英文材料).docVIP

Paving Equipment Stabilizers/Reclaimers A stabilizer/reclaimer is a vehicle with a dual purpose. These machines have a large rotor blade which may be used to cut and pulverize damaged or old pavement, but which also may be used to mix lime, fly ash, or cement into the subbase in order to stabilize poor soils. Milling Machines A top layer is milled off the existing pavement to provide a relatively smooth surface on which to pave. Milling is also commonly used to remove a distressed surface layer from an existing pavement. Milling machines are the primary method for removing old HMA pavement surface material prior to overlay. They can be fitted with automatic grade control to restore both longitudinal and transverse grade and can remove most existing pavement distortions. Milling also produces a rough, grooved surface, which will increase the existing pavement’s surface area when compared to an ungrooved surface. The surface area increase is dependent on the type, number, condition and spacing of cutting drum teeth but is typically in the range of 20 to 30 percent, which requires a corresponding increase in tack coat (20 to 30 percent more) when compared to an unmilled surface. Milling is advantageous because it: Provides RAP for recycling operations. Efficiently removes deteriorated pavement that is unsuitable for retention in the overlaid pavement. Provides a highly skid resistant surface suitable for temporary use by traffic until the final surface can be placed. Allows curb and gutter lines to be maintained or reestablished before HMA overlays. Provides an efficient removal technique for material near overhead structures in order to maintain clearances for bridge structures, traffic signals and overhead utilities. Figure 1: Side view of milling machine. Figure 2: Cutting tips on rotary drum. Graders Graders may be used in place of milling machines if the base course is dirt or gravel. They are vehicles with large blades that create a wide flat surface for asphal