Semi-hot bituminous mixtures on the A-23 highway (Zaragoza)
In a rehabilitation work on the pavement of the A-23 highway, between PPKK 250,700 to 277,600 (Zaragoza), nearly 30,000 t of semi-hot bituminous mixtures, types AC 22 bin S 35/50 and AC 16 surf, have been put into work. These were manufactured at an average temperature of 131 °C, that is, about 30 °C below the typical temperature of conventional hot production, thanks to the use of a bitumen foamer in the manufacturing plant.
According to the results of the production control and on-site control tests, the semi-hot mixes have satisfied the volumetric and mechanical requirements of equivalent conventional hot bituminous mixes. The article in the magazine RUTAS (Nº195) shows, in addition to the temperature reduction procedure used and the results of the tests, the economic, technical and environmental advantages of producing bituminous mixtures at low temperatures are reviewed. More specifically, they have tried to quantify those obtained in this case, concluding that life cycle analysis is the ideal tool to adequately assess the set of improvements found. Finally, some recommendations are made related to the reference density and water sensitivity of semi-hot bituminous mixtures.
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