7 documents found, page 1 of 1
Influence of Plastic Waste on the Workability and Mechanical Behaviour of Aspha...
Fonseca, Mariana; Capitão, Silvino; Almeida, Arminda; Picado-Santos, LuísThe use of plastic waste as a bitumen extender added throughout the manufacturing process of asphalt concrete contributes value to that type of waste. Moreover, this type of polymer can improve some mechanical properties of asphalt concrete without weakening its workability and other mechanical characteristics too much. The study aimed to address these issues for four types of plastic waste, using different pla...
An Assessment of Moisture Susceptibility and Ageing Effect on Nanoclay-Modified...
Almeida, Arminda; Crucho, João; Abreu, César; Picado-Santos, LuísIn this research, the moisture susceptibility of a nanoclay-modified asphalt concrete (AC) mixture containing plastic film (in flakes) collected as urban waste was evaluated with specimens subjected to the tecnico accelerated ageing (TEAGE) procedure. The TEAGE procedure attempts to simulate—in a laboratory setting—the e ect of field ageing by applying watering/drying cycles and ultraviolet radiation. For compa...
Estruturação de um Sistema de Gestão de Pavimentos para uma Rede Rodoviária de ...
Picado-Santos, Luís; Ferreira, Adelino; Pereira, Paulo A. A.No início de 2003, a Administração Portuguesa (Estradas de Portugal, EP, Entidade Pública Empresarial) decidiu desenvolver um novo sistema de gestão de pavimentos (SGP) para a rede rodoviária (cerca de 13000 km de extensão) sob sua administração. O sistema tem estado a ser desenvolvido por elementos da administração e também de universidades portuguesas. Este artigo descreve, do ponto de vista da participação d...
The influence of temperature variation in the prediction of the pavement overla...
Minhoto, Manuel; Pais, Jorge; Pereira, Paulo; Picado-Santos, LuísThis paper describes a study of the influence of temperature variation in the pavement overlay life, using finite-element methodology to consider the most predominant type of overlay distress observed in the field: reflective cracking. The temperature variation has a significant influence on thermally induced stresses that, in turn, affects the overlay predictive service life. This paper presents a three-dimens...
Predicting asphalt pavement temperature with a three-dimentional finite element...
Minhoto, Manuel; Pais, Jorge; Pereira, Paulo; Picado-Santos, LuísA Three-dimensional (3D) finite element (FE) model was developed to calculate the temperature of a pavement located in Northeast of Portugal. A case study was developed to validate the model. Input data to the model were the hourly values for solar radiation, air temperature and mean daily values of wind speed obtained from a meteorological station. The thermal response of a multilayered pavement structure was ...
Influência das variações de temperatura na previsão da vida à reflexão de fenda...
Minhoto, Manuel; Pais, Jorge; Pereira, Paulo; Picado-Santos, LuísRealizou-se um estudo sobre a influência das variações de temperatura na vida dos reforços de pavimentos. As variações de temperatura, conjugadas com o fenómeno de reflexão de fendas, considerada como principal degradação, agravam significativamente o estado de tensão no pavimento, reduzindo o tempo de serviço previsto para os reforços de pavimentos. Neste trabalho, apresenta-se o resultado duma análise, basead...
Low temperature influence in the predicted of pavement overlay
Minhoto, Manuel; Pais, Jorge; Pereira, Paulo; Picado-Santos, LuísThis paper describes a study of the influence of temperature variation in the pavement overlay life, using finite-element methodology that considers the most predominant type of overlay distress observed in the field: the reflective cracking. The temperature variation has a significant influence on thermally induced stresses that, in turn, affects the overlay predictive service life. This paper presents a three...