A study on the probable causes affecting the early deterioration of the national highway of barangay consuelo, san francisco, camotes islands

The purpose of the study was to determine the probable causes that had led to the early road deterioration of the national highway of Barnagay Consuelo, San Francisco, Camotes Islands. The study determined the types of failures found on the road, contribution of the soil on the early deterioration of the road, the adequacy of the pavement design, and the recommendation of measures to prolong the lifespan or improve the quality of the road.
Ocular survey showed that the asphalt pavement contained defects that vary from alligator cracking, longitudinal cracking, and potholes. Cracks provided a passage for the water to enter the underlying layers of the asphalt pavement thus decreasing the strength of the soil. Laboratory tests results have shown that the subgrade material used in the construction of the road is excellent to good based upon the soil classification system established by AASHTO. Parts of the drainage system were destroyed due to the movement of the soil caused by heavy loadings.
Furthermore, the study determined the adequate thickness of the asphalt pavement based on the asphalt paving design guide published by Asphalt Paving Association of Iowa (APAI) and U.S Corps of Engineers. Comparisons of the actual measurements and computed values have indicated that the thickness of the asphalt pavement is inadequate.
The study recommended increasing the asphalt pavement thickness, the reconstruction of the road, and proper maintenance to prolong the road?s lifespan. Recycling of asphalt could be also be considered.

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