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STEP 1:Evaluation of Existing Pavement Obtain available project information: including traffic, design, soil and material reports, pavement management performance data, climatic information, etc.
Establish existing condition of pavement: requires surveys for distress, roughness, friction,drainage, materials, soils, and other factors.Determine the causes of distress: a thorough evaluation of the data collected under stepl provides clues to determine the causes of the deterioration and reveal the extent of the deterioration. Successful pavement rehabilitation design requires much more evaluation of existing conditions
than new construction does.
STEP 2: Identification of Feasible Alternatives
Develop several preliminary altemativc designs by ensuring that existing deterioration is repaired and then prevented from recurring if at all possible. Another important concept is to apply rehabilitation work only to those areas that are significantly damaged.There are four major types of alternatives that should be at least initially considered in any 4R rehabilitation project:
a. Restoration一work roquired to return the existing pavement structure to a suitable condition to ptrform satisfactorily, without the immediate placement of an overlay. If
needed, an overlay could be placed after several years (stage construction)
b. Recycyling -reworling or strengthening of bases or subbases, recycling or reworking of existing material to improve its structural integrity, adding underdrains, or improving shoulders.
c. Resurfacing - adding layer(s) of surface to provide additional structure or improve serviceability.
d. Reconstruction一of either the entire pavement section or portions of it.
There ark, of course, many design alternatives and variations within each of these four types that should be considered.
STEP 3: Select the Preferred’ Rehababilitation Alternative
a. Conduct enginccring and economic analysis: determine the monetary and non-monetary decision criteria that will be usded in selecting preftrred alternative. Engineering factors include traffic control options, time of forte closures, available quality materials, climatic conditions, etc.
Monetary factors include coats to the user and agency. A life-cycle cost analysis of each alternative must then be conducted
b. Select the preferred rehabilitation alternative; evaluate each alternative with respect to the selected decision criteria, and sdxt the "preferred" alternative considering all important decision factors.