These days in Argentina, one of the major applications of interlocking concrete pavements is for city streets. They are being strongly promoted by municipal governments because of the technical, economical and aesthetical advantages, and also because the construction of concrete block pavements allows the employment of more people (with little working skills) compared with other paving alternatives. In Patagonia the times of construction depend greatly on the climate, and during the cold and wet season many workdays are lost. Concrete block pavements can still be constructed during very cold weather. This is because the concrete paver is precast, and delivered ready to be placed. Moreover its structural properties (strength, low absorption, etc.) are maintained despite low temperatures and high humidity.