The bonding of asphalt layers has direct reliance on road pavement structures strength and durability. Because insufficient bond between the slippage corrugations, rutting cracking occur life cycle becomes shorter. article describes research layers, which was carried out in 2010–2011 at Vilnius Gediminas Technical University Road Research Institute. In this assessed using shear (Leutner) test without normal stress specimen. samples were taken from sections Lithuania with standard also...

The triaxial test is a most widely used laboratory method for determining the soil shear strength. It assumed that sample deforms uniformly during testing. But one often faces case when in apparatus on contrary. non-uniformity can be caused by end restraining effect, height influence factor, insufficient drainage, membrane effect and self-weight factor etc. An analysis of known investigations lead to following tools could employed reducing an inaccuracy related non-uniform stress-strain...

Evaluation of static and dynamic method for measuring retroreflection road markingsInadequate poorly maintained markings significantly contribute to the occurrence traffic accidents.Consequently, it is necessary periodically evaluate state by conducting several tests, most important being coefficient as determined using or test method.The results research conducted in this study show that provides complete objective regarding quality markings, while somewhat unreliable due its limitations.

Environmental conditions (temperature, moisture and the intensity of sun) influence variation in asphalt pavement strength during year. Lithuania is situated a zone by average warm summers cold winters, most important climatic factor air temperature. This study presents temperature (of concrete (AC) subgrade layers) content to bearing capacity. The experimental research was obtained five sections road. road constructed 2007 operated for more than 12 years. paper statistical analysis between...

Gravel pavement prevails in Lithuanian state roads of regional significance, which make up 69% the total road network. Dustiness gravel reduces visibility and hinders traffic safety. Natural from deposits, particle size distribution ranges widely, is used most pavement. The variation typical all deposits melting glacial waters those river genetic origin Lithuania. contain a small quantity fine particles, large particles sufficient. However, becomes finer because wear, larger than 5 or 4 mm...

Recently, the accident rate in Lithuania has been among highest ones Europe. The experience of implementing Gravel Roads Paving Programme (Programme) shows that rates have increasing on reconstructed road sections. This enables to make an assumption design solutions taken gravel roads may be not suitable terms traffic safety, since, currently, attempts are made mini possible deviation project axis from existing axis. article evaluates quality safety objects through use method applied West...

Numerical simulation of cyclic compression granular material by performing oedometric test has been performed. Discrete Element Method (DEM) employed for simulation. A comparison study aimed to examine the differences in macroscopic behaviour discretized spherical (S) and non-spherical shape models a particle. During study, microscopic data sand from Klaipėda were used modelling particles. The nonspherical particles described multi-spherical (MS) retaining distributions size aspect ratios....

The paper presents an application of statistical and numerical methods for the determination forcedisplacement curves that pullout capacity prestressed grouted ground anchors installed in Miocene clay. A regression analysis data from a database acceptance test records to create has been performed, force-displacement curve tested anchor corresponding range loads applied tests created. linear model, employing weighted least squares method robust standard errors techniques were concluded serve...

Public transport is a key element of sustainable in medium and large cities. Therefore, it important that city residents want to use it. This paper aims determine the criteria public infrastructure which have most influence on passenger satisfaction with system. The stops, vehicles, route network were analysed. primary attention was focused rating these from least one. analysis scientific papers, specialized literature, Europe Union regulations, Lithuanian legislation, recommendations used...

Surfaces of airport pavements are subject to the friction decay phenomenon. A recurrent problem for runways is represented by deposits vulcanized rubber aircraft tires. This happens mainly in touch-down areas during landing operations, and loss grip compromises safety both take-off operations. study moves from International Civil Aviation Organization Italian Authority provisions concerning runway measurement reporting a better way analyze data. Being data mining computational process...

In this paper procedure for evaluating the effects of climate on pavement performance in Italy is proposed. To characterize Italian territory nine different simulated scenarios have been used. These were obtained by combining three situations latitude (North, Central and South) with conditions altitude (high, medium, low altitude). For each these scenarios, some configurations, proposed CNR road design catalogue medium high traffic flow, verified using Mechanistic-Empirical Pavement Design...

Throughout the world, research into various aspects and types of roundabouts has spanned many decades.During this long period number vehicles, their sizes, performance characteristics, including speeds, have radically changed.Similar changes are also noted for drivers' experiences.These had a strong influence on evolution modern roundabouts.The primary layout in relation to capacity traffic safety now known.However, there still areas that merit further evaluation they addressed as part aims...

Granular shoulder is an important element of road system. One can frequently notice shoulders rutting, edge breakage, unconformity cross-section to the norms that could be caused by wind and water-generated erosion. These problems directly affect drivers, influences their behaviour on traffic safety. Therefore, a constant maintenance necessary. Investigations Lithuanian gravel network showed lowvolume roads with surfacing do not correspond current standards change in performance due climatic...

It was in the year 2001 when Lithuania first started constructing roundabouts on rural roads of national significance with heavyweight transit traffic and creating conditions for sustainably safe traffic. A data statistical analysis shows that aims at designing small where diameter central island most cases is higher than average 25 m. Design construction Lithuanian often face problem territories. For this reason, inner outer radii as well entry exit are minimum do not meet current...

The state of hot mix asphalt pavement and its structure, predetermined by the distress level, largely depends on functional conditions. factors predetermining conditions service life structure are discussed in present article: traffic loads, local climate weather conditions, soils (their properties), other (soil water level moisturizing etc.). It is shown that road expressed roughness strength, strength coefficient Kst, componential composition upper layer physical mechanical properties....

In Lithuania, since 2007 the suitability of aggregates, used for producing asphalt mixtures, has been tested in accordance with requirements TRA MIN 07:2007 The List Technical Requirements Mineral Materials Roads. When analysing mechanical-physical properties aggregates tests different type manufacturers were carried out to determine resistance freezing and thawing (F value), fragmentation by Los Angeles Test (LA value) Impact (SZ polished stone value PSV, wear MDE dry particle density ρrd...

The study focused on grade-level rural two-lane two-way three-leg and four-leg stop-controlled intersections located in the flat area with a vertical grade of less than 5%. goal is to calibrate one Safety Performance Function at these by implementing Generalized Estimating Equation binomial distribution compare results yearly expected crash frequencies using models mainly refered scientific literature. data involved 77 intersections, which 25 are without left-turn lane (47 lane), 5 (6 lane)....

Nowadays it is possible to find many experimental and analytical studies aimed for better prediction of sand soil response during the installation loading stages displacement pile. The interaction between pile very complex, this reason why not exhaustively described, so far. Response soil, especially ultimate state necessitates investigate nature via tip shaft as well their relation. Qualitative evaluation stress influence on behaviour serves more clear description mechanism. Current...

Road classification and road hierarchy are essential steps making sure that roads designed used properly. is an approach, to sort them into a small number of groups or classes, then assigns the in network one more these groups. There many ways classify roads. One regarding (or specifically, functional hierarchy). The efficiency effectiveness directly impact economic growth societal development. Economically, it important through represent every function, as can enhance delivery goods...

An influence of the end boundary conditions to distribution stress and strains in a soil specimen during conventional compression triaxial tests is analyzed by experimental numerical methods. evaluation actual state important when determining shear strength parameters soil. These methods are used this paper investigate simulate contact between testing equipment ends sand test. Two different sample boundaries analyzed: first case, friction machine not eliminated (fixed ends); second (free...

Regional paved roads are low volume with a prevalence of heavy traffic. In the world, these concern about 80% total road network; however, traffic that affects is 20%. Since regional characterized by weak demand, budget for their management/maintenance very low. This produces considerable difficulties in choice strategies maintenance planning and scheduling. For this reason, recurring topics research field deal typical issues aim to develop cost tools methods. The study proposes decision...

Since 1998, when the Gravel Roads Paving Program was started on regional roads of Republic Lithuania, length gravel has shortened by 13.4% after reconstruction. It discovered, however, that reconstruction, 4.7% road sections became potentially dangerous. A disadvantage noted during implementation a slightly changed or entirely unchanged horizontal alignment roads. In addition, is paved, speed limit increases from 70 km/h to 90 km/h, as allowed traffic regulations, although design and planned...