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Authors
Advisor(s)
Abstract(s)
As camadas de desgaste dos pavimentos rodoviários são constituídas maioritariamente por materiais pétreos e a aptidão do agregado ao polimento é um factor de primordial importância no comportamento desta camada, quanto à aderência ao pneumático dos veículos.
Neste trabalho é efectuado um estudo dos resultados dos ensaios de polimento em agregados
através do ensaio de coeficiente de polimento acelerado (PSV) e tenta estabelecer uma relação,procurando valores de tendência entre os resultados obtidos nesse mesmo ensaio de polimento e a origem e características geológicas dos agregados. O objectivo é conhecer antecipadamente
um valor aproximado do PSV com base na classificação geológica e origem de um determinado agregado.
Numa segunda fase do trabalho é efectuado um estudo para uma tentativa de melhoramento
do comportamento do agregado ao polimento, partindo do aperfeiçoamento dos índices de
forma e de achatamento dos agregados, assim como pelo acréscimo da percentagem de faces
fragmentadas.
The surface layers in road pavements are mainly composed of stone materials, and the aggregate’s aptitude to polishing is a crucial factor when it comes to each layer’s behaviour in terms of adherence of the vehicles’ tyres. This paper deals with a study of the results of polishing tests on aggregates through the Polishing Stone Value (PSV) and it tries to determine a relationship, looking for trend values between the results obtained from this same polishing test and the aggregates’ origin and geological characteristics. The goal is to get to know an approximate PSV value beforehand,based on the origin and geological classification of a given aggregate. The second part of this paper consists of a study which attempts to improve the aggregates’ behaviour in terms of polishing, both by improving the aggregates’ Shape and Flakiness indexes,as well as by increasing their percentage of crushed surfaces.
The surface layers in road pavements are mainly composed of stone materials, and the aggregate’s aptitude to polishing is a crucial factor when it comes to each layer’s behaviour in terms of adherence of the vehicles’ tyres. This paper deals with a study of the results of polishing tests on aggregates through the Polishing Stone Value (PSV) and it tries to determine a relationship, looking for trend values between the results obtained from this same polishing test and the aggregates’ origin and geological characteristics. The goal is to get to know an approximate PSV value beforehand,based on the origin and geological classification of a given aggregate. The second part of this paper consists of a study which attempts to improve the aggregates’ behaviour in terms of polishing, both by improving the aggregates’ Shape and Flakiness indexes,as well as by increasing their percentage of crushed surfaces.
Description
Mestrado em Engenharia Geotécnica e Geoambiente
Keywords
Agregados Polimento Microtextura Pavimentos rodoviários
Citation
Publisher
Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto