LOW VOLUME ROADS IN LTITHUANIA AIVARAS VILKELIS MINDAUGAS

LOW VOLUME ROADS IN LTITHUANIA AIVARAS VILKELIS MINDAUGAS DIMAITIS HEAD OF DIVISION

ROAD PAVEMENTS 34 % Gravel roads of the whole Lithuanian state road network TOTAL Asphalt Gravel Other 21 242 km 13 895 km 7 267 km 80 km (100%) (65%) (34%) (1%)

LENGTH OF LOW VOLUME ROADS BASED ON AADT GROUPS

CROSS SECTION Gravel ≥ 5 cm (dalelių mažesnių, nei 0, 063 mm – nuo 8 % iki 17 %) Gravel mixture Žvyro arba skaldos Unbound base course from pagrindo sluoksnis, 15 crushed stone or gravel cm (dalelių mažesnių, Frost resistance ≥ 35 cm nei 0, 063 mm – (dalelių mažesnių, nei 0, 063 mm – nuo 0 % iki 7 %) nuo 0 % iki 7 %, f 10 ≥ 1, 0 m/parą)

REALITY 68 % žvyro dangos konstrukcijų storis mažesnis už norminį (vidutiniškai 11 cm mažiau nei 55 cm 99 % žvyro dangos sluoksnio medžiagų sudėtis netenkina norminių reikalavimų dėl minimalaus smulkiausių dalelių kiekio 83 % apsauginio šalčiui atsparaus sluoksnio medžiagų netenkina pralaidumo vandeniui reikalavimų 100 % žemės sankasos gruntų yra tinkami kelio sankasai Apie 35 % žvyro dangos sluoksnio medžiagų sudėtis tenkina norminius reikalavimus žvyro arba skaldos pagrindo sluoksniui

CONDITION Different materials on the same section

Specific climate conditions in Lithuania (60 -80 frost-thaw cycles annually). On low-volume roads the traffic rapidly increased in period 2000– 2009 and it became more visible that gravel roads often did not meet the requirements. Recent 20 years conventional asphalt concrete pavement structures were constructed Asphalt pavement (AC 16 PD) Unbound base course from crushed stone Frost resistant layer Subgrade 1) 2) When ESAL ≤ 50000 Depends on class of frost resistance of soil

Every year ≈ 2500 -3000 km are closed in spring time for 30 -40 days About 0. 7 million km travel distance on low volume roads everyday.

IMPLEMENTATION Programme budget over 0. 434 billion € It was spent during 15 years period. Average 29 million € a year Total 446 km in 2008. The best result. During the Programme implementation 196 km on average were paved. Klkll 196 km average paving works a year 446 397 275 330 5 98 99 00 01 157 112 02 03 256 231 247 04 165 107 05 06 40 07 08 09 71 10 11 101 12

SOLUTION-Soft asphalt AADT – ≤ 500 vpd; – Allowable number of 10 t standard axle loads – ≤ 100000; – Bearing capacity of the subgrade – ≥ 45 MPa; – Bearing capacity of the unbound base course – ≥ 120 MPa.

ECONOMIC CONSIDERATIONS 12

CONCLUSIONS • The results of testing and measurements in the laboratory and on the site were positive and promising. Based on that, it could be considered, that technology was successfully implemented, and good quality was achieved. • Positive feedback was received from the contractors due to workability of the mix, low temperature, low fume emission, better working conditions for the staff and workers. • In 2016 -2017 period it is planned to reconstruct 550 km 13

THANK YOU FOR YOUR ATTENTION