Encontrados 4 documentos, a visualizar página 1 de 1
Optimization of warm mix asphalts using different blends of binders and paraffi...
Silva, Hugo Manuel Ribeiro Dias da; Oliveira, Joel; Zoorob, S.; Peralta, Elvira Joana FerreiraIn road construction, several processes and products are now available to produce environmentally friendlier warm mix asphalts, including the use of synthetic paraffin wax additives. These additives facilitate the production of energy efficient asphalt mixtures at reduced manufacturing and construction temperatures. However, their sustainability during the road life cycle can only be obtained by optimizing the ...
The effect of using rest periods in 4PB tests on the fatigue life of grouted ma...
Oliveira, J. R. M.; Pais, Jorge C.; Thom, N. H.; Zoorob, S.Four-point bending tests are commonly used to assess the fatigue resistance of bi-tuminous bound materials that are used in road pavements. However, it is difficult to establish a reliable relationship between the laboratory test results and the field performance of the mate-rial. In order to predict the real life of the pavement, shift factors are normally used to convert the fatigue results obtained in the la...
A simple approach to the design of pavements incorporating grouted macadams
Oliveira, Joel; Zoorob, S.; Thom, N. H.; Pereira, Paulo A. A.Grouted macadams form a semi-flexible class of composites whose behaviour lies somewhere between concrete and conventional asphalt materials, having both excellent rut resistance and a degree of flexibility. This paper presents a series of pavement design computer simulations, based on results obtained from laboratory fatigue and stiffness tests on grouted macadam and conventional asphalt mixtures. The design v...
Fracture and fatigue strength of grouted macadams
Oliveira, Joel; Thom, N. H.; Zoorob, S.Grouted macadams form a class of material which provides significant advantages in comparison to both concrete and conventional asphalt, having both rut resistance and a degree of flexibility. This paper presents a series of laboratory tests on several grouted macadam mixtures, for stiffness, fatigue and low temperature fracture. The variables explored include binder grade and content, aggregate size and gradat...
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