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Mechanical response of polymer modified asphalt
Asphalt is not only an example of a complex material with colloidal characteristics (it is colloidal suspension of asphaltenes covered by a stabilizing phase of polar resins that form complex micelles dispersed in the oily maltenic phase), it is also very important engineering material. Asphalt is frequently used as a binder in paving mix and as a waterproofing material. In order to improve its engineering properties asphalt is frequently blended with various polymers. Such blending produces sometimes a completely new material with properties vastly different from the properties of the original - base asphalt. Generally the polymer modified asphalts (PMA) have reduced thermal susceptibility and are less susceptible to permanent deformation. The mechanical response of soft base asphalt modified by styrene-butadiene-styrene (SBS) block copolymer and also by ethylenevinylacetate (EVA) copolymer is studied in three deformation modes. Small amplitude shear oscillations yield the linear viscoelastic characterization of the studied polymer modified asphalts.The shear creep and recovery experiments, performed at different stress levels, yield the information on the accumulated and residual deformations, in the studied materials. Finally the steady shear experiments generate the shear rate dependent viscosity functions. Some unexpected behaviour observed in the studied PMAs, with relatively low concentrations of the above mentioned polymers will be discussed.
Mechanical response of polymer modified asphalt
Asphalt is not only an example of a complex material with colloidal characteristics (it is colloidal suspension of asphaltenes covered by a stabilizing phase of polar resins that form complex micelles dispersed in the oily maltenic phase), it is also very important engineering material. Asphalt is frequently used as a binder in paving mix and as a waterproofing material. In order to improve its engineering properties asphalt is frequently blended with various polymers. Such blending produces sometimes a completely new material with properties vastly different from the properties of the original - base asphalt. Generally the polymer modified asphalts (PMA) have reduced thermal susceptibility and are less susceptible to permanent deformation. The mechanical response of soft base asphalt modified by styrene-butadiene-styrene (SBS) block copolymer and also by ethylenevinylacetate (EVA) copolymer is studied in three deformation modes. Small amplitude shear oscillations yield the linear viscoelastic characterization of the studied polymer modified asphalts.The shear creep and recovery experiments, performed at different stress levels, yield the information on the accumulated and residual deformations, in the studied materials. Finally the steady shear experiments generate the shear rate dependent viscosity functions. Some unexpected behaviour observed in the studied PMAs, with relatively low concentrations of the above mentioned polymers will be discussed.
Mechanical response of polymer modified asphalt
Mechanisches Verhalten von polymermodifiziertem Asphalt
Vlachovicova, Zora (author) / Stastna, Jiri (author) / Zanzotto, Ludo (author)
2005
8 Seiten, 10 Bilder, 17 Quellen
Conference paper
English
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