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Combining asphalt-rubber (AR) and fast-pyrolysis bio-oil to create a binder for...

Best paper award of the conference ; The bio-oil from fast pyrolysis is mainly a product of the recycling of waste materials. This is a viscoelastic material, and after a heat treatment it has a viscosity similar to many types of asphalt used in the paving industry. Although bio-oil showed very good high temperature performance, the same was not verified at low temperatures. Therefore, GTR from cryogenic milli...

Development of a rubber-modified fractionated bio-oil for use as noncrude petro...

The increasing demand for petroleum-derived products coupled with decreasing world crude reserves has led to substantial increases in asphalt pricing. Society’s additional interest in energy independence and use of renewable sources of energy is also a motivation for developing and using more sustainable materials such as binders derived from noncrude petroleum sources for use in highway applications. Iowa Stat...

Monitoring rubber swelling and de- and re-vulcanization through AR elastic reco...

Healthy economies require an appropriate transportation system, in which roadways are an essential part. Therefore, the construction and maintenance of road pavements should be long lasting and have a significant impact on the economic vitality of a nation. The elastic recovery is a property characteristic of the elastomers, or binders modified with those polymers, being used to classify them and especially to ...

New experimental methods to monitor and characterize asphalt rubber binders

The need for continuous quality improvement of the road pavements, leads to the development of new binders, such as asphalt rubber (AR). AR is produced by the digestion of crumb rubber from used tires on bitumen. The resulting AR is a heterogeneous material with high viscosity. The study of this product during its production is essential due to the sudden and sharp increase in the volume of AR in this phase. Kn...

Changes in the rubber morphology caused by the interaction with bitumen

It is estimated that about 10 kg of tires are discarded per inhabitant annually. This residue can be reused as a constituent of pavements in the form of asphalt rubber (AR) binder. The use of bitumen modified with crumb rubber contributes for a sustainable development of road infrastructures through: (i) the definition of an efficient final destination for the used tires of cars and trucks; (ii) the improvement...

Rheological changes in bitumen caused by aging and by the interaction with rubber

The use of bitumen modified with crumb rubber contributes for a sustainable development of road infrastructures. However, the increasing demands on quality and durability of pavements lead lo the need of a profound knowledge in the physicochemical changes of the materials which constitute these AR binders. In this work several base bitumens interacted with crumb rubber in order to produce AR binders, which were...

Influence of the bitumen properties on the functional and rheological behaviour...

It is estimated that about ten kilograms of tires are discarded per inhabitant annually. The negative impact of this residue can be reduced since rubber can be reused as a constituent of asphalt rubber (AR) builder in road pavements. However, the materials which constitute the AR binders and their interaction are not sufficiently characterized, In this work several base bitumens interacted with crumb rubber in ...

Modeling heat and mass transfer in the heat treatment step of yerba maté proces...

The aim of this research was to estimate the leaf and twig temperature and moisture content of yerba maté branches (Ilex paraguariensis Saint Hilaire) during heat treatment, carried out in a rotary kiln dryer. These variables had to be estimated (modeling the heat and mass transfer) due to the difficulty of experimental measurement in the dryer. For modeling, the equipment was divided into two zones: the flame ...

Guia prático de doentes medicados com fármacos que interferem na hemostase porp...

Protective monoclonal antibodies to diphtheria toxin