|
Pavement milling (cold planing, asphalt milling, or profiling) is the process of removing at least part of the surface of a paved area such as a road, bridge, or parking lot. Milling removes anywhere from just enough thickness to level and smooth the surface to a full depth removal. There are a number of different reasons for milling a paved area instead of simply repaving over the existing surface. == Purpose == Recycling of the road surface is one of the main reasons for milling a road surface. Milling is widely used for pavement recycling today, where the pavement is removed and ground up to be used as the aggregate in new pavement.〔(【引用サイトリンク】url=http://www.fhwa.dot.gov/pavement/recycling/98042/05.cfm )〕 For asphalt surfaces the product of milling is reclaimed asphalt pavement (RAP), which can be recycled in the asphalt hot mix asphalt (pavement) by combining with new aggregate and asphalt cement (binder) or a recycling agent.〔 This reduces the impact that resurfacing has on the environment. Milling can also remove distresses from the surface, providing a better driving experience and/or longer roadway life. Some of the issues that milling can remove include:〔(【引用サイトリンク】url=http://www.arra.org/presentations/cold_planing.pdf )〕 * Raveling: aggregate becoming separated from the binder and loose on the road〔(【引用サイトリンク】url=http://www.pavementinteractive.org/article/raveling/ )〕 * Bleeding: the binder (asphalt) coming up to the surface of the road * Rutting: formation of low spots in pavement along the direction of travel usually in the wheel path〔(【引用サイトリンク】url=http://www.asphaltinstitute.org/public/engineering/maintenance_rehab/asphalt-pavement-distress-summary.dot )〕 * Shoving: a washboard like effect transverse to the direction of travel〔 * Ride quality: uneven road surface such as swells, bumps, sags, or depressions〔 * Damage: resulting from accidents and/or fires It can be also be used to control or change the height of part or all of the road. This can be done to control heights and clearances of other road structures such as: curb reveals, manhole and catch basin heights, shoulder and guardrail heights, and overhead clearances.〔 It can also be done to change the slope or camber of the road or for grade adjustments which can help with drainage. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pavement milling」の詳細全文を読む スポンサード リンク
|