DOI•
Testing Conditions for Asphalt Binder Testing Using Dynamic Shear Rheometer with 4 mm Diameter Parallel Plate Geometry
01 Jan 2021-
TL;DR: In this article, an overview of the necessary equipment to use the 4 mm geometry for asphalt binder testing including an explanation of shear compliance correction is given, and the testing conditions of 4 mm geometrical geometry including specimen preparation, specimen conditions and test parameter are evaluated.
Abstract: No standard procedure is available for low temperature asphalt binder testing in the Dynamic Shear Rheometer. In this study, an overview is given of the necessary equipment to use the 4 mm geometry for asphalt binder testing including an explanation of shear compliance correction. Furthermore, the testing conditions of 4 mm geometry including specimen preparation, specimen conditions and test parameter are evaluated. Additionally, practical tips and screenshots on the implementation of recommended parameters and testing conditions in the software rSpace and RheoCompass are provided. Overall, this paper provides extended information and guidelines on how to use the 4 mm geometry and which testing conditions to consider for testing asphalt binder in the low temperature range.
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TL;DR: An interlaboratory study was conducted among 20 road asphalt laboratories, to screen current test protocols for testing low temperature properties of asphalt binders using a Dynamic Shear (DSH) as mentioned in this paper.
Abstract: An interlaboratory study was conducted among 20 European road asphalt laboratories, to screen current test protocols for testing low temperature properties of asphalt binders using a Dynamic Shear ...
6 citations
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TL;DR: In this article, a new technique using 4-mm parallel plates on a dynamic shear rheometer (DSR) with machine compliance corrections was developed to measure low-temperature properties of asphalts.
Abstract: A new technique, which uses 4-mm parallel plates on a dynamic shear rheometer (DSR) with machine compliance corrections, was developed to measure low-temperature properties of asphalts. Good results have been achieved at test temperatures as low as -40°C. The test method requires only about 25 mg of material instead of 15 g for the bending beam rheometer (BBR). Also, no specimen premolding is needed, and a relatively low temperature (60°C to 70°C) is required to load the samples into the measuring system. The key to the new technique is correction for errors due to machine compliance. Two types of machine compliance correction were applied to the dynamic frequency sweep data in this work. The following areas were investigated: effects of machine compliance on the measured low-temperature properties, reproducibility of data, consistency among data collected on different sizes of plates after machine compliance corrections, and comparison between the corrected data from DSR and converted BBR data. Results s...
91 citations
TL;DR: In this paper, the effect of polymer modification on the dynamic rheological properties at low temperatures was investigated using the 4-mm DSR technique and fluorescence microscopy and temperature-modulated differential scanning calorimetry.
53 citations
TL;DR: In this paper, a dynamic shear rheometer with 4-mm parallel plates (4-mm DSR) was used to investigate the low temperature rheological properties of bitumen.
Abstract: This paper investigates the low temperature rheological properties of bitumen using a dynamic shear rheometer with 4 mm parallel plates (4-mm DSR). Different procedures of sample preparation were tested and evaluated. For comparison, low temperature measurements were also carried out using a bending beam rheometer (BBR). Test results show that the 4-mm DSR can perform rheological measurements at very low temperatures (down below −30 °C). With this geometry, very little amount of bitumen sample is required. There are certain statistical correlations between complex modulus measured by 4-mm DSR and creep stiffness by BBR, and also between phase angle and m-value. With the BBR data at 60 s loading time, higher correlation coefficients were observed at lower DSR frequencies or at a frequency corresponding to the 60 s loading time. For the limiting temperatures, a statistical correlation was found in LST between the two test methods; however, there was very weak or no correlation in LmT. The presence of waxes in bitumen seems to have a negative effect on the correlations between the 4-mm DSR and BBR. This is probably due to differences in thermal histories caused by the large differences in sample size between BBR and DSR tests. In addition, DSR with 8-mm plates can be applied to certain low temperatures, depending on instrument compliance and stiffness of the binder to be tested.
42 citations
TL;DR: In this paper, the possibility of using the dynamic shear rheometer (DSR) with 4'mm parallel plates and 3'mm gap was investigated as an alternative experimental method to measure the rheological properties of asph...
Abstract: The possibility of using the dynamic shear rheometer (DSR) with 4 mm parallel plates and 3 mm gap is investigated as an alternative experimental method to measure the rheological properties of asph...
24 citations
TL;DR: In this article, the 4mm parallel plate geometry in the DSR with a new sample installation method was proposed to evaluate low temperature rheological properties of asphalt binders, and suitable test conditions were identified to run T-f-sweep tests in oscillation mode.
Abstract: The 4 mm parallel plate geometry in the DSR with a new sample installation method is proposed to evaluate low temperature rheological properties of asphalt binders. For this purpose, the influences of temperature conditioning and normal force were studied, and finally suitable test conditions were identified to run T-f-Sweep tests in oscillation mode. Appropriate shear stresses were identified by amplitude sweep tests considering the instrument limitations. Consequently, testing conditions and instrument limitations are determined, which need to be respected to obtain precise and repeatable rheological data.
12 citations