Abstract
In Chile, the selection of asphalt binders is based on traditional specifications. Although the Superpave specification has not been implemented yet, it was consider important to make a zoning process of the Chilean territory according to this methodology. This activity relied on the information of 94 weather stations of the Chilean Meteorological Service (DMC in Spanish) and Chile’s Water Department (DGA in Spanish), which have reliable data for a minimum of 20 years. Weather data, together with the Koppen climate classification for Chile and the topography of our territory, were used to define approximate zones where the use of each type of asphalt binder is appropriate. Zoning data indicate that most of our territory can be covered by three types of asphalt binders: for the northern and southern regions the use of PG 58-28 is recommended; the central region requires PG 64-22; and finally, the Patagonia and high mountain zones need PG 52-34. In the IX Region, there is a small area in the Andean foothills, where PG 64-34 is required, according to the available climate information and the methodology applied. Classifications PG 64-22, PG 58-28 and PG 52-34 are traditional binders, which were zoned for high-speed traffic conditions and moderate traffic volume.
Highlights
Pavements’ maintenance requirements greatly depend on the adequate selection of materials for their respective structural layers
Asphalt binders are susceptible to thermal conditions, that is, their performance strongly depends on the existing weather
The second work determined PG temperatures of the area between Santiago and Los Angeles, based on data from 38 weather stations, but no specific recommendations were made regarding the use of traditional binders in each zone
Summary
Pavements’ maintenance requirements greatly depend on the adequate selection of materials for their respective structural layers. Asphalt binders are susceptible to thermal conditions, that is, their performance strongly depends on the existing weather. A binder can have enough stiffness to resist rutting in a cold zone, but it can show a bad performance in a warm zone concerning the same failure. Relevant researches have been made in Chile, which address the influence of climate and the advanced characterization of asphalt materials on the performance and maintenance of flexible pavements (Delgadillo et al, 2011; Araya et al, 2012; Delgadillo et al, 2014; García et al, 2014; Osorio et al, 2015). Considering the above, in 1987, the Strategic Highway Research Program, SHRP, (Kennedy et al, 1994) of the United States began to develop a new specification system for asphalt
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