New Philippine road standards to make highways last longer

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Monday, April 18, 2011


NEW standards for Philippine roads have been adopted, allowing them to last longer, the Department of Public Works and Highways (DPWH) said on Monday.

In Department Order 22, series of 2011, DPWH Secretary Rogelio Singson said the thickness for the new construction and rehabilitation, or upgrading of Portland Cement Concrete Pavements shall be 280 millimeters (mm).

However, a thickness of no less than 230 mm may be adopted depending on the Cumulative Equivalant Single Axle Load (Cesal), the primary measure used for the selection of the appropriate design of roads depending on the type of vehicle using it.

"The standardized pavement thickness will prevent the early deterioration of road pavements due to overloading," he said in a statement.

The department will be implementing a new method for pavement rehabilitation. Under the new standard, new pavements to be overhauled are required to have a minimum thickness of 260 mm.

For pavement reblocking, the thickness of the new pavement will be the same as the replaced blocks.

For asphalt pavements, a minimum thickness of 50 mm is prescribed for overlaying works but on grounds of economy, pavement thickness of more than 50 mm will be considered only if the cost of the asphalt pavement of such thickness is less than the cost of a 230 mm thick concrete pavement.

On both pavement types, the thickness of pavement will be verified from pavement design analysis using the American Association of State Highway and Transportation Officials (Aashto) method as contained on the DPWH Design Guidelines.

Aashto is a standards setting body that publishes specifications, test protocols and guidelines used in highway design and construction throughout the United States.

The Philippines, through the DPWH, is the only country outside North America authorized to use the Aashto Standards.

For pavement width, minimum width of the carriageway will be 6.70 meters. For rehabilitation or upgrading work involving for a road that is at least 500 meters, the minimum width of the carriageway to be adopted will also be 6.70 meters. (FP/Sunnex)

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