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Concrete pavement restoration and preservation is a group of various techniques used to maintain concrete roadways. ==CPP/CPR Techniques== CPP and CPR techniques include slab stabilization, full- and partial-depth repair, dowel bar retrofit, cross stitching longitudinal cracks or joints, diamond grinding and joint and crack resealing. CPP and CPR methods, developed over the last 40 years, are used in lieu of asphalt overlays and bituminous patches to repair roads when longer lasting solutions are desired. Due to rising oil prices, these methods are often less expensive than an asphalt overlay and last three times longer in addition to providing a greener, more sustainable solution. 〔(Minnesota DOT )〕〔(AirportBiz.Com )〕 A recent study was conducted that shows that diamond grinding is an effective means of extending the service life of concrete by imparting a smooth pavement surface with desirable surface texture. The process can also be used to address faulting at joints or cracks, roughness, polished concrete surfaces exhibiting inadequate macrotexure, wheel path rutting, unacceptable noise levels, permanent upward slab warping and inadequate transverse slopes. The California Department of Transportation (CALTRANS), a pioneer in the use of diamond grinding to preserve their concrete roadways, has determined that the average age of a diamond ground surface in California is between 16 to 17 years, and a pavement can be diamond ground up to three times.〔(CALTRANS )〕〔(Roads & Bridges )〕 Dowel Bar Retrofit (DBR) is a process that re-establishes load transfer capability on doweled joints and cracks by installing epoxy-coated, round steel dowels into existing concrete pavement across transverse joints and/or cracks. Slots are cut using diamond-tipped saw blades; the existing concrete is removed and the dowels are placed in the slots across the joints or cracks. The slots are then backfilled with a non-shrink grout and the pavement is diamond ground to restore smoothness. The diamond grinding removes excess grout and any displacement of panels. The entire road is often diamond ground to remove bumps or dips and provide a safe, quiet riding surface. In Wisconsin, researchers found that the overall accident rate for diamond ground surfaces was only 60 percent of the rate for the non-ground surfaces.〔(CALTRANS )〕〔(Better Roads )〕 〔(IGGA )〕〔(IGGA )〕〔Fast full-depth pavement repair: To open a pavement to traffic quickly, it takes more than just fast-setting concrete. By Gerald F. Voigt. Concrete Repair Digest. April/May 1995.〕〔Concrete Pavement Rehabilitation, Guide for Full-Depth Repairs. U.S. Department of Transportation, Federal Highway Administration, August 2003. By Angel Correa and Bing Wong. 24 pages.〕〔State of California DOT, Division of Engineering Services. The Effectiveness of Diamond Grinding Concrete Pavements in California, May 2005. 33 pages.〕 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「Concrete Pavement Restoration」の詳細全文を読む スポンサード リンク
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