The purpose of this research was to determine the effect of full-depth reclamation (FDR) on the strength and durability of aggregate base layers in a coordinated approach involving both field and laboratory testing. Field comparisons between the pre-reclamation neat base and post-reclamation blended base were supplemented with laboratory experiments conducted to determine the effects of reclaimed asphalt pavement (RAP) content, compaction effort, and heating on the strength and durability of roadways reconstructed using FDR with a portable asphalt recycling machine (PARM). Also, the effect of reclamation on the spatial uniformity of the pavement structures was explored by comparing variability in the pre- and post-reclamation material properties. Test sites in Orem, Utah; San Marcos, Texas; and South Jordan, Utah, were selected for this research. The results of field testing indicate that the FDR process significantly increased the stiffness and/or strength of the base material at two of the test locations and did not significantly change the third base material. An evaluation of spatial variability indicated that the FDR process produced equivalent or lower spatial variability with respect to both base modulus and California bearing ratio (CBR) values at one site, while the other two sites exhibited equivalent or higher spatial variability after FDR. The results of laboratory testing for all three locations indicate that specimens compacted using the modified Proctor method exhibit significantly higher CBR values and dry densities than specimens compacted using the standard Proctor method. Also, the CBR values for specimens tested in the dry condition were significantly higher than those obtained from specimens tested at optimum moisture content. These results demonstrate the value of achieving a high level of compaction during construction and preventing water ingress into the pavement over time. The blended material exhibited a significantly lower CBR value than that of the neat material at only one location; the addition of RAP to materials at the other locations did not significantly change the CBR values of those materials. In the tube suction test (TST), most of the specimens were classified as marginally or highly moisture-susceptible, and the effect of RAP on the dielectric value in the TST was of no practical importance. The use of PARMs in the FDR process is an acceptable, economical, and environmentally friendly approach to reconstruction of flexible pavements. To ensure satisfactory performance of FDR projects, engineers and managers should carefully follow recommended guidelines for project selection, pavement testing, material characterization, design, construction, and quality assurance testing.

The purpose of the following report is to account for and summarize the authority and tasks that municipalities, authorities and contractors have in the implementation of temporary traffic diversions. In addition to this, the cooperation between all actors has also been investigated with the aim of finding out what types of routines and potential tools are used in connection with the work. The implementation of the report is based on a qualitative study, for which relevant people with different tasks have been interviewed or answered questionnaires. Furthermore, governing documents for relevant parties have been studied with the intention of describing the requirements that apply to work adjacent to or on the road. The results have subsequently been compiled in an account of the work parties' tasks, views and suggestions for improvement. In this it appears that the road maintenance authorities have an examinative responsibility and has the authority to approve the work carried out on its behalf. For and in particular all road works, of which the diversion is a part, traffic device plans must also be drawn up and describe solutions for traffic-related problems. These are the tasks of the executing contractor to draft with regard to the requirements of the road maintenance authority. It also appears that the majority of the interviewees consider the cooperation to be satisfactory, but state how interpretation of the governing documents can result in conflicts between the parties. In addition, significant differences for the systems used in the coordination can be noted for each municipality and authority.

Klimatpåverkan och energiförbrukning är ett av de stora miljöproblemen runt om i världen idag. Sedan den industriella revolutionens start har mängden utsläpp av bland annat koldioxid ökat exponentiellt med årens lopp och skapat obalans i klimatet, inte minst på grund av restprodukter och skadliga ämnen som används inom bland annat byggindustrin. Syftet med denna studie är att ta reda på vilka arbetsmoment som har störst påverkan på miljön för att sedan, om möjligt, ta fram förslag på hur det kan förbättras. Frågeställningen vi utgått från vid genomförandet av denna studie har varit; “Av de arbetsmetoder vid ett bygge av en väg, vilken del är mest skadlig för miljön?”. Den huvudsakliga metoden för detta arbete har varit en fallstudie där en undersökning om ett projekt har gjorts. Ett antal klimatkalkyler med olika vägmaterialsegenskaper gjordes som sedan jämfördes mot varandra. Av dessa kalkyler kunde slutsatsen att kallasfalt släpper ut mycket mindre koldioxid jämfört med vanlig asfalt men det krävs mer forskning kring detta för att kunna dra en säkrare slutsats. / Climate impact and energy consumption are one of the biggest environmental problems around the world today. Since the start of the industrial revolution, the amount of carbon dioxide emissions has increased exponentially over the years. These emissions created imbalances in the climate, not least because of residues and harmful substances used in the construction industry. The purpose of this study is to find out which methods have the greatest impact on the environment, and then, if possible, make suggestions on how it can be improved. The issue we have researched in this study has been; "what method of building a road is most harmful to the environment?”. The main method of this work has been a case study in which a survey of a project has been conducted. A number of climate calculations with different road material properties were made which were then compared to each other. The conclusion we were able to make is that cold-asphalt releases much less carbon dioxide than normal asphalt, but more research is needed to draw a more accurate and reliable conclusion.

Doctor of Philosophy / The control systems installed in modern vehicles lack crucial information regarding the interaction between the tires and the road surface. This knowledge gap significantly impacts the safety and control of the vehicle. Thus, to address this issue, this research introduces a novel fusion approach to estimate friction at the tire-road contact interface. This hybrid fusion friction estimation algorithm employs techniques like signal processing and machine learning, backed up by information from various vehicle and tire dynamics models, to develop algorithms that estimate the level of friction between the tire and the road. This fusion approach enables more precise estimations of the friction coefficient in both normal driving situations and scenarios involving sudden changes in speed or road conditions. Therefore, this research aids in enhancing vehicle safety and control by providing improved information about such tire-road interactions.

Рост перевозок с помощью автомобильных поездов существенным образом сдерживается недостаточной их проходимостью и невозможностью широко использовать в районах с малой сетью усовершенствованных дорог. Существует большое количество способов для повышения эффективности использования автопоездов в тяжёлых дорожных условиях. Однако, наиболее эффективным методом является передача крутящего момента тягача колесам прицепа, которые в этом случае становятся ведущими. Автором были рассмотрены вопросы повышения проходимости автопоездов, а также был спроектирован механический привод на полуприцеп. / The growth of transportation by road trains is significantly constrained by their low off-road opportunities and enables to use in areas with a small network of improved roads. There are a lot of ways to improve efficient using road trains in difficult road conditions. However, the most efficient way is transfer torque from truck to trailer wheels which will active in this situation. Author considered the issues of improve off-road opportunities road trains and also constructed a mechanical active drive of the trailer wheels.

No description available.

No description available.

A infraestrutura viária desempenha um papel importante na eficiência do transporte urbano. O sistema de transporte é um desafio para os gestores públicos. Em Uberlândia (MG), as autoridades municipais discutem propostas na busca de sua melhoria para a mobilidade urbana. O objetivo deste trabalho é analisar a rede de infraestrutura urbana de um eixo viário na região Sudeste de Uberlândia, considerando o fluxo veicular, os projetos implantados e as condições de circulação dos veículos, comparando a capacidade viária existente e ampliada. Foram discutidos diferentes elementos da via e suas consequências para a malha viária do eixo. Os resultados foram obtidos a partir da contagem volumétrica classificada veicular em 8 postos de pesquisa com maior fluxo veicular nos períodos de 6:15h às 8:15h e de 17:30h às 19:30h, e o local com maior volume de tráfego encontrou-se na interseção da Avenida Jaime de Barros com a Rua Pascoal Bruno, em direção ao Terminal Santa Luzia. Na maioria dos postos pesquisados ocorreram medidas paliativas que adiaram a concretização dos projetos previstos nos Planos Diretores e foram encontrados problemas envolvendo sinalizações horizontal e vertical. Foi possível verificar que os projetos viários, embora presentes em diferentes gestões públicas, nem sempre foram viabilizados, sendo um dos entraves encontrados à dificuldade nas indenizações pelas desapropriações de lotes. O eixo estudado é uma mistura de obras finalizadas e outras não conclusas. Dos acidentes de trânsito em 2014 com vítimas, 77,78% envolveu resgate de motociclistas, com maior incidência nos bairros São Jorge e Santa Luzia. O volume veicular nas vias arteriais foi menor do que o estabelecido por Vasconcellos (2005), onde conclui-se que os motoristas utilizam vias fora do eixo como outras opções viáveis para os deslocamentos na região, alterando a dinâmica urbana no eixo estudado. / Road infrastructure plays an important role in urban transport system efficiency. The transportation plan is a challenge for public managers. In Uberlândia (MG), the city authorities are searching for alternatives in the urban mobility. The objective of this study is to analyze the urban road infrastructure network of an axis road in the southeast region of Uberlândia, considering the traffic flow, implemented roadworks and the vehicle circulation conditions, comparing the current and future road capacity. The discussion includes different road components and the consequences for the axis road routes. Vehicle volume counts were carried out at 8 different research points with the volume counts showed more intense traffic during 2 (two) periods - from 6:15 to 8:15am and from 17:30 to 19:30pm. The most intense traffic volume occurred in the intersection of Jaime de Barros Avenue and Pascoal Bruno Street, in direction of the Santa Luzia Terminal. The major research points received only palliative measures that caused a delay in the implementation of projects included in the main Transportation Plan and problems related to horizontal and vertical traffic signs. Some of the roadworks were not completed although they were included in different public administrations. One of the main obstacles was the difficulty related to properties compensation in the area. The analyzed axis road is a mixture of finished and unfinished roadworks. Of traffic accidents in 2014 with victims, 77.78% involved rescue of motorcyclists, with greater incidence in the São Jorge and Santa Luzia neighborhoods. The vehicular flow counted on the main roads are lower than established by Vasconcellos (2005), for the results that drivers use off-axis routes as other viable options for the displacements in the region, changing the urban dynamic in the analysed axis road. / Dissertação (Mestrado)

Orientador: Cassio Eduardo Lima de Paiva / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo / Made available in DSpace on 2018-08-06T16:48:11Z (GMT). No. of bitstreams: 1 Berti_Carolina_M.pdf: 4127695 bytes, checksum: f8e52fd73231b7c47f0a12b5c7e759cc (MD5) Previous issue date: 2005 / Resumo: Esta pesquisa procurou estabelecer uma correlação entre os valores de capacidade de suporte resultantes dos ensaios CBR (Califórnia Bearing Ratio) versus DCP (Dynamic Cone Penetrometer), realizados com o solo proveniente de vias não-pavimentadas dentro do Campus da UNICAMP, situado em Campinas, São Paulo. O Cone de Penetração Dinâmica (DCP) é caracterizado como um equipamento simples, portátil e de baixo custo, cujo ensaio revela ser praticamente não-destrutivo. Com ele é possível determinar o perfil de resistência de camadas de solo compactadas ou em seu estado natural, controlar a execução de obras viárias e avaliar estruturas de pavimentos. Uma investigação do solo através de ensaios DCP e CBR conduziu ao desenvolvimento de modelos de regressão, correlacionando a capacidade de suporte obtida através de ensaios ¿in situ¿ com o auxílio do DCP, e ensaios de laboratório utilizando o ensaio de CBR e DCP. Através das informações contidas na literatura técnica, dos procedimentos experimentais efetuados e das análises de regressão realizadas, ficou evidenciado o relacionamento entre o DCP e o CBR, validando as correlações estabelecidas e propondo modelos próprios, aumentando a confiabilidade dos resultados dos ensaios DCP para avaliação da capacidade de suporte de solos / Abstract: This research establishes a correlation among the strength or supporting values of the tests: CBR (California Bearing Ratio) versus DCP (Dynamic Cone Penetrometer), accomplished with the soil originating from no-paved roads inside of the Campus of UNICAMP. The Cone of Dynamic Penetration (DCP) it is characterized as an equipment simple, portable and of low cost, whose tests reveals to be practically no-destructive. DCP test determines the profile of resistance of soil layers compacted or in your natural state, to control the execution of road buildings and to evaluate structures of pavements. An investigation of the soil through DCP and CBR tests led to the development of regression models, correlating the strength measures obtained through in-situ tests with the aid of DCP and laboratory tests using the CBR and DCP. Through the information contained in the technical literature, of the made experimental procedures and of the regression analyses accomplished, the relationship was evidenced between DCP and CBR, validating the established correlations and proposing own models, increasing the reliability of the results of the DCP tests for determining strength values of soils / Mestrado / Transportes / Mestre em Engenharia Civil

The 85th percentile off-road glances while performing three tasks on an in-vehicle system while driving in a simulator was investigated. The tasks were a radio task, a telephone task and a sound settings task which were performed at three occasions each. The distribution of 85th percentile off-road glance durations for each subject and task showed that durations differed between individuals rather than between tasks. It also turned out that durations longer than 2.00 seconds were not rare and 2 of 16 subjects had durations longer than 2.00 seconds in the radio task. Even though the distribution showed small differences between tasks on an individual level, differences on a group level were found between the tasks. A tendency of a learning effect was found, which implied a decrease in 85th percentile off-road glance durations as the tasks were performed at several occasions. A tendency of a floor effect in 85th percentile off-road glance durations, when the subjects are familiarized with tasks, was also found. Performance on a computerized trail-making test, measuring ability of visual search, motor speed and mental flexibility, was found not to be related with 85th percentile off-road glance durations.