About
35
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Introduction
With my Bachelor thesis I started working with the Dynamic Shear Rheometer (DSR) in 2013. Since then, I gained a lot of experience in developing new test procedures and testing of asphalt binder and asphalt mastic in the DSR, both from Malvern (now Netzsch) and Anton Paar. The main areas of interest are performance tests (creep tests, fatigue tests, relaxation tests), the binder-fast-characterization-test (BTSV) and the 4mm geometry, all using the DSR.
Current institution
Education
October 2010 - September 2016
Publications
Publications (35)
A novel test method for measuring the Poisson’s ratio of asphalt binders using a Dynamic Shear Rheometer (DSR) equipped with a linear drive is presented. The paper describes the preparation ofhomogeneousand isotropic cylindrical binder specimens, their loading into the DSR, and the subsequent measurement of the absolute complex shear modulus |G*|,...
Three different rejuvenators are blended with a differently-aged penetration graded asphalt binder 50/70 and investigated using different rheological test methods. Characteristic temperatures T(G*=15 kPa) and T(G*=5 MPa) as well as corresponding phase angles δ(G*=15 kPa) and δ(G*=5 MPa) are used to evaluate the efficiency of the rejuvenators, to ob...
![Categorization of plastics by size [11].](publication/362773553/figure/tbl1/AS:11431281079748436@1660832351775/Categorization-of-plastics-by-size-11_Q320.jpg)
In order to reduce production and compaction temperatures, as well as to increase the resistance to permanent deformation, synthetically refined waxes are commonly used as additives in asphalt pavements. This study focuses on the capability of replacing synthetically refined wax with bio-degradable wax. Ten different bio-waxes (called Biomer) with...
One predominant type of failure in under-designed asphalt pavements in cold regions is cracking due to low-temperature induced stress. The asphalt binder is the key factor that drives cracking resistance of the asphalt layer. Due to its visco-elastic behavior, the asphalt binder is basically able to relax induced stress, however relaxation capacity...
A novel Three-Point Bending Beam Test (3-PBT) using a Dynamic Shear Rheometer (DSR) with linear drive motor is introduced for testing asphalt binder at low temperature conditions. This 3-PBT in DSR can be used as surrogate for Bending Beam Rheometer (BBR) tests. Advantages in comparison to BBR are that (i) 3-PBT works without harmful cooling medium...
In this article, creep properties of asphalt binders and asphalt mastics (binder filler composite) are tested in the Dynamic Shear Rheometer using a single shear creep test and considering steady-state flow conditions. These tests are performed for a set of 10 different asphalt binders and 18 corresponding asphalt mastics. The same material combina...
For designing asphalt materials resistant to permanent deformation and rutting, a low creep deformation at high temperature is the crucial performance property. Usually, creep deformation is assessed through static or cyclic compression tests at elevated temperature, both for asphalt mixtures as well as for asphalt binders. For asphalt mixtures, st...
The use of Dynamic Shear Rheometer (DSR) has become a standard tool to characterise bituminous binders, either for research or specifications purposes. Testing with the DSR enables to cover a wide range of temperature and frequency conditions in a fast way by using limited amount of materials. Depending of the test type, DSR measurements provide di...
Im Rahmen der Wiederverwendung von Asphalt ist es notwendig, das im Ausbauasphalt enthaltene, gealterte Bitumen durch Maßnahmen der Verjüngung wieder in den Zustand eines lieferfrischen Bindemittels zu versetzen. Rejuvenatoren sind geeignete Stoffe zur Verjüngung von Bitumen. Die Produktpalette an Rejuvenatoren ist riesig, doch es mangelt an einer...
Styrene-butadiene-styrene (SBS) modified bitumen is a widely-used civil engineering material with a variety of applications. The properties and durability of bitumen greatly depend on its chemical composition. Due to its organic nature bitumen is highly prone to oxidation. The main cause of bitumen oxidation is the interplay of sunlight (photo-oxid...
Asphalt mastic is known to play an important role when determining the fatigue performance of asphalt mixture. Time sweep test using a Dynamic Shear Rheometer can be used. However, a long testing time is a major disadvantage, and no guidelines for testing asphalt mastic are available. Therefore, this study presents an Accelerated Dynamic Shear Rheo...
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 speci...
Die Prüfung von rheologischen Eigenschaften von Bitumen und bitumenhaltigen Bindemitteln mit dem Dynamischen Scherrheometer (DSR) findet international und in Deutschland immer mehr Verbreitung. Weil das Messgerät DSR eine Vielzahl von unterschiedlichen Messverfahren ermöglicht, besteht vielerorts Unklarheit darüber, welches Messverfahren am geeigne...
The use of Dynamic Shear Rheometer (DSR) has become a standard tool to characterise bituminous binders, either for research or specifications purposes. Testing with the DSR enables to cover a wide range of temperature and frequency conditions in a fast way by using limited amount of materials. Depending of the test type, DSR measurements provide di...
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 Rheometer (DSR) with 4 mm diameter parallel plate geometry. From the comparison of the test protocols for conducting temperature-frequency sweep tests be...
Asphalt binder ageing leads to significant changes in mechanical and physicochemical properties and often to premature cracking in asphalt pavements. A polymer-modified asphalt binder is repeatedly aged through laboratory techniques, i.e. rolling thin film oven test and pressure age-ing vessel. The resulting properties of the aged binder are analys...
The use of porous asphalt (PA) mixture to build the wearing course is in some countries common practice to enhance durability and performance of asphalt pavements. Meanwhile, a number of studies have been conducted to evaluate the possibility of improving the pavement performance through the incorporation of fibers at the binder and mixtures level....
The current experimental method used in Europe to characterise asphalt binder at high temperature is based on the Ring & Ball softening point. However, for modified binders it was demonstrated that such a method is unable to correctly characterise the material. In the present work, an alternative solution to determine the high-temperature propertie...
A simple method using Dynamic Shear Rheometer is proposed for determining high temperature key parameters of asphalt binders in place of the Ring-and-Ball softening point, currently used in Germany. The test was recently introduced in the German standards under the name “Bitumen-Typisierungs-Schnell-Verfahren (BTSV)”, which translates to Binder-Fas...
In this study, usual asphalt mixtures are tested using known and established perfor-mance testing methods. In a second step, the asphalt mastics (mastic considered as composite of asphalt binder and aggregate filler) that correspond to the asphalt mix-tures, are investigated with regard to their rheological properties. All asphalt mixtures and corr...
![DSR geometries recommended in function of material stiffness [10]](profile/Johannes-Buechner/publication/337181519/figure/tbl1/AS:826854189563905@1574148809256/DSR-geometries-recommended-in-function-of-material-stiffness-10_Q320.jpg)
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 mo...
As a consequence of aging, asphalt binders from reclaimed asphalt pavements (RAP) are brittle and more susceptible to cracking than virgin binders. During recycling of RAP different additives/rejuvenators are used together with different addition rates in order to restore original asphalt binder properties and to build asphalt pavements with good p...
The performance and durability of asphalt pavements can be estimated by using performance tests on laboratory scale. However, these tests methods are very complex and elaborate. In comparison to conventional tests (sieving curve, void content, etc.) sophisticated and expensive cyclic testing instruments are required, which prevent the implementatio...
In this paper, 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 asphalt binders at low temperature. A special butterfly silicone mold was prepared for this purpose and the corresponding testing procedure wa...
The Binder-Fast-Characterization-Test in the DSR can be used instead of conventional test methods for characterizing plain and modified asphalt binders in the high temperature range. The test is called “Bitumen-Typisierungs-Schnell-Verfahren (BTSV)” and was recently introduced to the German standards. With two rheological key parameters (TBTSV and...
With the Binder-Fast-Characterization-Test (BTSV, Bitumen-Typisierungs-Schnell-Verfahren, in German) plain and modified bitumen can be characterized in the high service temperature range. The method uses the Dynamic Shear Rheometer (DSR) and is based on the historical Softening Point Ring & Ball (SPR&B), which is unable to correctly characterize mo...
