Various North American transportation agencies have implemented several preventative maintenance techniques to improve pavement performance and safety. The Region of York, located north east of Toronto, Ontario, has been resurfacing and remedying pavements with microsurfacing treatments to improve the pavement surface conditions. Often times these maintenance methods were selected because they seemed the most appropriate given a budget constraint however little was known if these treatments impacted road safety. The Region of York made their road and safety data accessible for the purpose of this research. Thus the focus of this thesis is to gain an understanding of how microsurfacing and resurfacing treatments impact road safety to help the Region of York and potentially other jurisdictions make more sound decisions when selecting pavement maintenance treatments. Road related fatalities account for 90 percent of transportation related deaths in Canada despite safety measures such as stronger safety laws and public awareness campaigns. There is a need for engineers to think outside of the box and look at other ways to improve road safety. Given the high costs to society for crashes it only seems logical that safety should be a part of a preventative maintenance decision making process. A fair amount of research has been done on the influence of pavement friction on traffic safety; however no studies were uncovered that examined how microsurfacing (a treatment designed to improve the frictional properties of pavement) affected safety. This study accomplishes five research objectives based on the needs of the Region of York and past experience: 1. Establishes that there is a statistically significant relationship between microsurfacing treatments and safety for specific traffic conditions using a before-after analysis 2. Determines that there is a statistically significant relationship between resurfacing and safety under specific traffic conditions using a before-after analysis 3. Illustrates the need and value added if there is better cohesion between road data and safety data 4. Demonstrate that safety has a role to play in pavement management, especially regarding preventative maintenance strategies and offers guidance on how to approach the integration using York Region as a case study 5. Develops a concept decision making framework that demonstrates how safety data should be considered in pavement maintenance decision making at both the network level applying life cycle costs and project level using decision making flowcharts. These tools while specific to York Region can be adopted in jurisdictions with similar characteristics The study concludes that microsurfacing and resurfacing safety effects are sensitive to the influence of treatment year data (which may be an anomaly period) and average annual daily traffic (AADT) per lane. The findings of this study have opened the door to additional research; integration of safety under the pavement umbrella seems logical and yet has barely been explored. Recommendations that have resulted from this work deal with data collected and how it is managed; analysis methodology and additional opportunities for further study; and finally how to optimize the application of the findings to best serve engineers that are involved in the maintenance decision making process. There is much potential for further research in the area of safety within a pavement management framework and the resultant studies will have a tremendous benefit to society.

Various North American transportation agencies have implemented several preventative maintenance techniques to improve pavement performance and safety. The Region of York, located north east of Toronto, Ontario, has been resurfacing and remedying pavements with microsurfacing treatments to improve the pavement surface conditions. Often times these maintenance methods were selected because they seemed the most appropriate given a budget constraint however little was known if these treatments impacted road safety. The Region of York made their road and safety data accessible for the purpose of this research. Thus the focus of this thesis is to gain an understanding of how microsurfacing and resurfacing treatments impact road safety to help the Region of York and potentially other jurisdictions make more sound decisions when selecting pavement maintenance treatments. Road related fatalities account for 90 percent of transportation related deaths in Canada despite safety measures such as stronger safety laws and public awareness campaigns. There is a need for engineers to think outside of the box and look at other ways to improve road safety. Given the high costs to society for crashes it only seems logical that safety should be a part of a preventative maintenance decision making process. A fair amount of research has been done on the influence of pavement friction on traffic safety; however no studies were uncovered that examined how microsurfacing (a treatment designed to improve the frictional properties of pavement) affected safety. This study accomplishes five research objectives based on the needs of the Region of York and past experience: 1. Establishes that there is a statistically significant relationship between microsurfacing treatments and safety for specific traffic conditions using a before-after analysis 2. Determines that there is a statistically significant relationship between resurfacing and safety under specific traffic conditions using a before-after analysis 3. Illustrates the need and value added if there is better cohesion between road data and safety data 4. Demonstrate that safety has a role to play in pavement management, especially regarding preventative maintenance strategies and offers guidance on how to approach the integration using York Region as a case study 5. Develops a concept decision making framework that demonstrates how safety data should be considered in pavement maintenance decision making at both the network level applying life cycle costs and project level using decision making flowcharts. These tools while specific to York Region can be adopted in jurisdictions with similar characteristics The study concludes that microsurfacing and resurfacing safety effects are sensitive to the influence of treatment year data (which may be an anomaly period) and average annual daily traffic (AADT) per lane. The findings of this study have opened the door to additional research; integration of safety under the pavement umbrella seems logical and yet has barely been explored. Recommendations that have resulted from this work deal with data collected and how it is managed; analysis methodology and additional opportunities for further study; and finally how to optimize the application of the findings to best serve engineers that are involved in the maintenance decision making process. There is much potential for further research in the area of safety within a pavement management framework and the resultant studies will have a tremendous benefit to society.

CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / Os tratamentos de superfÃcie se apresentam como um dos tipos de revestimentos asfÃlticos mais aplicados em pavimentos flexÃveis nas rodovias brasileiras. Isso se deve a sua utilizaÃÃo na construÃÃo de rodovias de baixo e mÃdio volume de trÃfego, bem como na conservaÃÃo e manutenÃÃo de pavimentos existentes. Dentre os tratamentos de superfÃcie, destacam-se o Tratamento Superficial Simples (TSS) e Duplo (TSD), que juntos representam 63% da malha rodoviÃria pavimentada do estado do CearÃ, e o Microrrevestimento AsfÃltico (MRAF), cuja aplicaÃÃo tem crescido ao longo dos anos. A junÃÃo do TSS e MRAF à conhecida como Cape Seal (CS) e tem como diferencial reunir caracterÃsticas de ambos os tratamentos, entretanto, sem aplicaÃÃo conhecida em rodovias cearenses. A dissertaÃÃo tem como objetivo geral desenvolver um programa experimental que avalie o desempenho do CS em laboratÃrio para um agregado mineral (AM) e um agregado siderÃrgico (AS). Na metodologia desenvolvida no estudo, dividiu-se o programa laboratorial em quatro procedimentos experimentais que conduziram o desenvolvimento da pesquisa desde a caracterizaÃÃo dos materiais utilizados, moldagem e dosagem dos corpos de prova, atà a realizaÃÃo dos ensaios de desempenho e avaliaÃÃo dos pavimentos testados em um simulador de trafego de laboratÃrio. Os resultados da caracterizaÃÃo do AS atenderam com seguranÃa aos parÃmetros recomendados pelas especificaÃÃes tÃcnicas. Os corpos de prova confeccionados com agregado siderÃrgico e submetidos ao simulador de trÃfego apresentaram resultados melhores do que o agregado mineral quanto à avaliaÃÃo ao desgaste, deformaÃÃo e rugosidade, indicando assim a potencialidade do AS em tratamentos do tipo CS e TSD. Observou-se, diante do programa experimental executado, que o cape seal quando comparado ao TSD atravÃs de parÃmetros tÃcnicos e econÃmicos, apresentou uma melhor capacidade de absorÃÃo de cargas, maior qualidade de rolamento e menor desgaste. Entretanto, quanto ao aspecto de custos, a aplicaÃÃo do CS deve ser analisada cuidadosamente diante da viabilidade do projeto. Acredita-se que o cape seal seja aconselhÃvel para rodovias que necessitem de um revestimento de melhor qualidade quando comparado ao TSD

El presente proyecto de tesis es una investigación cualitativa de diseño experimental-exploratoria donde el objeto es mostrar la Importancia de la Determinación de un Micropavimento en frío como capa de rodadura asfáltica de Alta Performance desestimando otras soluciones técnicas para Conservación Vial de Carreteras desarrolladas en el Perú, para un proyecto que presenta factores complejos tanto en clima, geografía y tráfico en el Departamento de Ancash, Proyecto Conococha – Recuay. El Micropavimento en frío es una mezcla asfáltica de alto performance, se caracteriza por su durabilidad en el tiempo “vida útil” y en su comportamiento ante climas severos característicos de nuestro país, geografía abrupta y tráfico intenso, está compuesta por agregados 100% triturados, emulsión asfáltica modificada con polímeros, filler mineral, agua y aditivos. Se empleó el uso de laboratorios especializados para determinar la compatibilidad de materiales, diseño de la mezcla y aplicación en el proyecto, así mismo se verificó el control de calidad durante la aplicación del micropavimento para dar factibilidad a la solución planteada. Se concluye que al aplicar un micropavimento en frio de 10mm. de espesor bajo las condiciones climáticas, geográficas y tráfico es mas rentable a lo largo de la vida útil del pavimento, presenta un excelente confort, su impacto es positivo al medio ambiente, de alto rendimiento de colocación y rápida apertura al tráfico; por estos motivos se determina que es la solución técnica mas efectiva para el Proyecto Conococha – Recuay. This thesis project is a qualitative exploratory-experimental research design where the object is to show the importance of determining a cold microsurfacing as asphalt wearing course of High Performance dismissing other technical solutions developed Road Maintenance in Peru for a project that presents complex factors both in climate, geography and traffic in the Department of Ancash, Conococha – Recuay Project. The cold microsurfacing is an asphalt mixture of high performance, it is characterized by its durability over time "life" and its behavior in typical severe weather of our country, rugged geography and intense traffic, it is composed of 100% crushed aggregates, polymer-modified emulsified asphalt, mineral filler, water and additives. The use of specialized laboratories was used to determine the compatibility of materials, mix design and implementation in the project, also the quality control was verified during the application of microsurfacing to give feasibility to the proposed solution. It concludes that by applying a cold microsurfacing, 10mm. thick under the climatic, geographic and traffic is more cost effective over the pavement’s life, features an excellent comfort, its impact is positive for the environment, high-performance positioning and quick opening to traffic; for these reasons it is determined to be the most effective technical solution to the Conococha - Recuay Project.

No description available.

This thesis is focused on microsurfacing technology. The theoretical part describes modern trends especially in the field of coloured surfaces and special system Flexiplast®. The practical part presents the results of conducted tests, particularly tests of breaking time, cohesion, determination of wearing and determination of friction after polishing. The key advantage is that it specifies which aggregates, which were taken from quarries through the Czech Republic, are convenient for this specialized technology. It was verified that RAP material suits use in microsurfacing. Furthermore, colour mixtures are viable for practical application which was confirmed by tests in the laboratory and trial lying as well. Special use of technology in the system Etanpalst and pictures which show field work are presented.

No description available.

FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico / O Microrrevestimento AsfÃltico a Frio (MRAF) Ã um tipo de revestimento aplicado na manutenÃÃo preventiva de pavimentos que tem sido usado com sucesso em outros estados do Brasil e no mundo, desde que nÃo existam problemas estruturais na rodovia. Para a composiÃÃo do MRAF tem sido empregados agregados locais que em alguns casos se tornam escassos e com custos elevados. Essa realidade tem motivado pesquisadores a estudarem novos materiais para serem empregados em revestimentos asfÃlticos. Sendo assim, a pesquisa aqui proposta tem o objetivo geral de verificar a viabilidade tÃcnica, econÃmica e ambiental do uso do Agregado SiderÃrgico (AS) e do material fresado na aplicaÃÃo do MRAF. Para tanto, elaborou-se um programa experimental desenvolvido em quatro etapas. Na primeira etapa, procedeu-se a coleta e a caracterizaÃÃo de agregados convencionais e alternativos (AS e material fresado) e da emulsÃo modificada por polÃmeros de ruptura controlada (RC1C-E). Na segunda etapa, foram realizados estudos de dosagem, de desgaste superficial e de tempo de cura em laboratÃrio atravÃs de ensaios usualmente empregados. Na terceira etapa, foi analisado o comportamento do MRAF, aplicado diretamente sobre uma base de pavimento asfÃltico de comportamento mecÃnico conhecido, quando submetido a um simulador de trÃfego de laboratÃrio. Na quarta etapa, foi realizado um comparativo de custos de aplicaÃÃo do MRAF utilizando os agregados convencionais e alternativos. A partir dos resultados, observou-se que os agregados alternativos estudados tÃm potencial para serem empregados em serviÃos de MRAF, sem diminuiÃÃo de sua vida Ãtil e propiciando uma reduÃÃo nos custos de aplicaÃÃo. / Microsurfacing is a type of bituminous wearing course applied in pavement preventive maintenance that has been used successfully in states of Brazil and the world, but cannot be applied in structurally deficient pavements. For microsurfacing composition it is used local aggregates that in some cases become scarce and expensive. This situation has motivated researchers to study new materials to be used this bituminous wearing course. Therefore, the main objective of the present research is to verify the technical, economic and environmental viability of using steel slag and recycled asphalt aggregates in microsurfacing applications. To reach the main objective, a laboratory procedure was developed in four steps. In the first step, the collection and characterization of conventional and alternative aggregates (steel slag and recycled asphalt aggregates) and polymer-modified emulsified asphalt were made. In the second step, mix desing, surface abrasion resistance and set time tests were performed. In the third step, the microsurfacing performance was analyzed by a laboratory traffic simulator when it is applied over a base material with a known mechanical behavior. In the fourth step, a comparative cost study of microsurfacing application using conventional and alternative aggregates was performed. The laboratory procedure results indicated that the alternative aggregates studied have the potential to be used in microsurfacing aplications without service life decreasing, providing a reduction in implementation costs.