QuestionsQuestions (DPWH DEPARTMENT ORDER NO. 22, S. 2011)
To prescribe guidelines on the design standards—specifically minimum pavement thickness and width of national roads—to avoid early pavement deterioration caused by uncontrolled overloading.
The minimum thickness for new road construction, rehabilitation, or upgrading using PCCP is 280 mm.
A thickness less than 280 mm but not less than 230 mm may be adopted if the Cumulative Equivalent Single Axle Load (CESAL) is not more than 7.0 x 10^6.
CESAL stands for Cumulative Equivalent Single Axle Load; DO 22, s. 2011 allows PCCP thickness between 230 mm and below 280 mm if CESAL does not exceed 7.0 x 10^6.
It is attached as Annex A.
A minimum thickness of 260 mm.
The thickness of the new pavement shall be the same as the replaced blocks.
The minimum thickness of the overlay is 50 mm.
More than 50 mm shall be considered only on grounds of economy, i.e., when the cost of the asphalt pavement of such thickness is less than the cost of a 230 mm thick PCCP.
It must be verified from pavement design analysis using the AASHTO method contained in the DPWH Design Guidelines, Criteria and Standards, considering the latest AADT and axle loading.
The latest Annual Average Daily Traffic (AADT) and axle loading.
A minimum carriageway width of 6.70 meters.
For rehabilitation or upgrading involving at least 500 meters, the minimum carriageway width shall be 6.70 meters, provided the works will not require right-of-way acquisition.
A length of at least 500 meters.
This Order shall take effect immediately.
Early deterioration is attributed to uncontrolled overloading, which the Order aims to prevent through proper design standards.
Pavement thickness must be verified through pavement design analysis using the AASHTO method in DPWH Design Guidelines, Criteria and Standards, incorporating latest AADT and axle loading.