Influence of commercial waxes and polyphosphoric acid on bitumen and asphalt concrete performance at low and medium temperatures
2006 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 39, no 7, 725-737 p.Article in journal (Refereed) Published
The influence of adding four types of commercial wax and one polyphosphoric acid to a non-waxy bitumen was investigated with regard to binder and asphalt concrete mixture performance. Binder properties were determined using dynamic shear rheometer (DSR), bending beam rheometer, force ductilometer and various conventional test methods. Asphalt concrete performance was investigated using tensile stress restrained specimen test (TSRST), creep test at -25 degrees C, dynamic creep test at 40 degrees C and complex modulus test at 0, 10 and 20 degrees C. Totally eleven binders and eight asphalt mixtures were investigated.
TSRST fracture temperatures of the asphalt mixtures were marginally influenced by the addition of any of the additives, and significant physical hardening of the binders, observed by BBR testing, could not be established using TSRST. Also in creep testing of asphalt mixtures at -25 degrees C, recorded effects were less pronounced compared to binder testing.
In dynamic creep testing, the smallest permanent strains were recorded for the asphalt mixtures containing FT-paraffin or montan wax, indicating better resistance to rutting. Adding polyethylene wax or polyphosphoric acid to the non-waxy bitumen used, showed considerable positive stiffening effects on the binder at medium and higher temperatures. However, this increase in stiffness could not be shown in dynamic creep testing (at 40 degrees C) of asphalt concrete mixtures containing these additives.
Place, publisher, year, edition, pages
2006. Vol. 39, no 7, 725-737 p.
Additives, Asphalt, Binders, Concretes, Creep, Fracture, Low temperature effects, Rheology, Stiffness, Strain, Waxes, Bending beam rheometer, Dynamic shear rheometer (DSR), Force ductilometer, Polyphosphoric acid, Tensile stress restrained specimen test (TSRST)
IdentifiersURN: urn:nbn:se:kth:diva-8931DOI: 10.1617/s11527-006-9134-8ISI: 000243151500006ScopusID: 2-s2.0-33747091314OAI: oai:DiVA.org:kth-8931DiVA: diva2:14418
QC 20101006. Uppdaterad från submitted till published (20101006).2005-01-082005-01-082010-10-06Bibliographically approved