Abstract
The article contains general characteristics of Lithuanian motor roads and possibilities of their development. 63.72% of Lithuanian motor roads of national importance (according to their length) have asphalt pavement. It is shown that modernization of national motor roads mainly includes paving of gravel roads. It is pointed out that the main indices characterizing the condition and service life of asphalt pavement and its construction are: hot mix asphalt (HMA) concrete resistance to binding tension, tensile elasticity modulus and fatigue resistance. The values of these indices highly depend on the componential composition and structure of HMA concrete as well as on the degree of its compaction. The suitability of HMA concrete for road pavement construction is well characterized by its physical mechanical indices according to Marshall: stability S, flow F, volume of air voids Va etc. These indices also are highly dependent on the composition and structure of HMA concrete. Investigations carried out in the Lithuanian motor roads and in laboratory helped to determine asphalt concrete dependencies between the componential composition of HMA concrete and values of its physical and mechanical properties according to Marshall. Conclusions and recommendations are included.
Highlights
According to Lithuanian Road Administration under the Ministry of Transport and Communications, the construction, reconstruction, repairs and management of roads are well budgeted: in 1998 – 575 mln
The suitability of hot mix asphalt (HMA) concrete for road pavement construction is well characterized by its physical mechanical indices according to Marshall: stability S, flow F, volume of air voids Va etc
Investigations carried out in the Lithuanian motor roads and in laboratory helped to determine asphalt concrete dependencies between the componential composition of HMA concrete and values of its physical and mechanical properties according to Marshall
Summary
According to Lithuanian Road Administration under the Ministry of Transport and Communications, the construction, reconstruction, repairs and management of roads are well budgeted: in 1998 – 575 mln. HMA concrete is designed for construction of road pavement its quality must be evaluated according to the properties modelling its condition during pavement usage These properties can be defined by physical and mechanical indices according to Marshall. It has been reported (Petkevičius, Sivilevičius 2008) that in more than 65% of cases the poor quality of HMA concrete is the main cause of early fatigue of HMA pavement of Lithuanian roads (and roads of other countries with similar climate conditions).
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