Figure 5 - uploaded by Josef Zak
Content may be subject to copyright.
Source publication
Similar publications
Citations
... The rut depth results were reported as the average value of two tested specimens (European Committee for Standardization, 2007). Žák and Vavřička (2011) analysed the vertical contact stress distribution of a similar HWTT device built by the same manufacturer (ConTech). By utilising 3-D finite element modelling the study reported a parabolic-like distribution of vertical contact stress between the rubber wheel and the surface of the sample with a maximum value of ∼ 1000 kPa in the centre of the contact area. ...
Although the MSCR test has become an improvement over the Superpave® |G*|/sinδ parameter, shear stress levels specified in the MSCR test might prove to be too low to successfully represent the stresses occurring in the pavement. To address this hypothesis, five conventional asphalt binders and a total of twelve polymer-modified asphalt blends were tested by MSCR at two different temperatures (50°C and 60°C) as well as five different shear stress levels of 0.1, 3.2, 6.4, 12.8, and 25.6 kPa. The rut results of hot mix asphalts were correlated with the MSCR results. Consequently, better correlations were obtained at higher shear stress levels used in performing MSCR. Moreover, it was shown that MSCR test overestimated the positive effects elasticity on the asphalts’ rut resistance and, thus, more consideration should be given to the asphalt’s ability to resist the applied stresses than to its elastic recovery.
... A wheel with a 20 x 50 mm solid rubber hoop and an outside diameter of 200 mm reciprocated on the surface of each specimen. The rubber hoop applied a 700 N load on a 2.2 x 50 mm transient area [19]. ...
The sustainable use of non-renewable natural resources, such as asphalt binder, can be achieved by adequate planning. The proper assessment of asphalt binders is a prerequisite to the appropriate designing of road constructions that can eventually result in pavements in which the development of pavement distresses can be mitigated. Rutting is the most common distress occurring at high temperatures, which is frequently experienced by such countries as Indonesia; thus, the use of adequate asphalt binder in hot mix asphalt pavements results in long-lasting road constructions. By means of advanced techniques, e.g., multiple stress creep recovery test, conducted on a dynamic shear rheometer, it is possible to determine the rutting potential of asphalt binders. This technique, however, still seems to be imprecise at currently determined shear stress values. This paper aims to investigate on the example of ten different asphalt binders, if creep and recovery measured at higher shear stresses result in better correlation with rutting potential of hot mix asphalts than that at the standardized stress levels. Concurrently, other conventional asphalt binder properties (e.g., penetration, softening point, elastic recovery) are determined and compared with rutting.
