Asfalto dangos sluoksnių sukibimo tyrimai
Santrauka
Dėl didėjančio transporto intensyvumo ir apkrovų, asfalto dangoms keliami vis aukštesni reikalavimai. Norint pasiekti kuo didesnį asfalto dangų stipruma, ir tvarumą, didelis dėmesys yra skiriamas atskirų asfalto sluoksnių ir jiems naudojamų asfalto mišinių fizinių mechaninių savybių tyrimams. Tačiau vertėtų pabrėžti, jog ne tik atskirų asfalto sluoksnių medžiagos, bet ir asfalto dangos sluoksnių tarpusavio sukibimas yra labai svarbus veiksnys siekiant prailginti dangos eksploatavimo laiką ir užkirsti kelią pažaidų susidarymui. The bonding of asphalt layers has direct reliante on road pavement structures strenght and durability. Because of insufficient bond of pavement layers the slippage and tearing, rutting and cracking emerge and the pavement life cycle becomes shorter. The article describes the research on bonding of asphalt layers, which was made in 2010-2011 at Vilnius Gediminas technical University Road Research Institute. In this research the strength of layers bonding was assessed using direct shear (Leutner) test, without normal stress in specimen, and direct Pull-off test for thin layers bonding assessment. The part of samples was chosen from road sectors in Lithuania with standard asphalt layers, thin asphalt layers also asphalt layers with geosynthetics interlayer and another part was made at laboratory. The laboratory research consisted of bonding strength reliance to kind and amount of bitumen emulsion between asphalt wearing course and asphalt binder also asphalt wearing course compaction degree. The research shows that the asphalt layers bonding strength of chosen samples of roads in Lithuania in most cases meets the requirements of standard documents as well as the usage of geosynthetics between asphalt layers worsens their blonding strength