scholarly journals Mechanism of Deformation Twinning in Tantalum Driven by Extremely Dynamic Shear-Compression at Low Temperature

2013 ◽  
Vol 19 (S2) ◽  
pp. 1766-1767
Author(s):  
C. Chen ◽  
J.N. Florando ◽  
M. Kumar ◽  
K.T. Ramesh ◽  
K.J. Hemker
Keyword(s):  
Low Temperature ◽  
Deformation Twinning ◽  
Dynamic Shear

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

scholarly journals Evaluation of bitumen physical properties modified with waste plastic pipes

2018 ◽  
Vol 45 (6) ◽  
pp. 469-477 ◽  
Author(s):  
Sevil Köfteci ◽  
Perviz Ahmedzade ◽  
Taylan Günay
Keyword(s):  
Low Temperature ◽  
Physical Properties ◽  
Test Results ◽  
Dynamic Shear ◽  
Modified Bitumen ◽  
Bending Beam Rheometer ◽  
Waste Plastic ◽  
Plastic Pipes ◽  
Low Temperature Cracking ◽  
Rotational Viscosity

The aim of this paper is to examine the effects of ground plastic pipe wastes on bitumen. For this purpose, three modified bitumen samples with modifier contents of 2%, 4%, and 6% along with pure bitumen were prepared and tested. To understand the effect of modifier on bitumen, conventional bitumen tests, rotational viscosity tests at 135 °C and 165 °C, dynamic shear rheometer tests at three different frequencies that represent three different traffic speeds, and bending beam rheometer (BBR) test were performed. The BBR test results showed that resistance of pure bitumen to low-temperature cracking increased by using additives up to 4%. Based on the results of this study, it can be said that waste plastic pipes can be used as modifier for the bitumen binder. The 4% additive showed the best performance.

Effect of Ageing on Rheological Properties of Asphalt

2021 ◽  
Vol 891 ◽  
pp. 185-189
Author(s):  
Li Xing Ma
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Rheological Properties ◽  
Complex Modulus ◽  
Dynamic Shear ◽  
Dynamic Shear Rheometer ◽  
Field Behavior ◽  
Aged Asphalt ◽  
Actual Field

This paper is to study the mechanism of aging on the rheological properties of the asphalt and make correlations with the actual field behavior of the binder. The effects of ageing on rheological properties of asphalt has been studied by Dynamic Shear Rheometer(DSR). Significant differences of rheological properties and composition were observed between fresh and aged asphalt. The results show that aging at low temperature increases the complex modulus of asphalt, but has little effect at high temperature.

Research of the Recycled Asphalt 's Rheological Behavior

2012 ◽  
Vol 550-553 ◽  
pp. 2395-2401
Author(s):  
Jin Li
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Rheological Behavior ◽  
Dynamic Shear ◽  
Dynamic Shear Rheometer ◽  
Bending Beam Rheometer ◽  
Recycled Asphalt

Analyze the rheology of recycled asphalts used by three rejuvenators：R1、R2、R3，the study of recycled asphalt's rheological behavior adopt BBR(Bending Beam Rheometer) and DSR(Dynamic Shear Rheometer). From the result of experiment：the usage of rejuvenator reduce the asphalt ability of anti-tracking under high temperature, some of them can even recover to the level of fresh asphalt；the mix of rejuvenators improve largely the asphalt ability of resistance to fatigue and the ability of anti-cracking under low temperature.

Considerations for using the 4 mm Plate Geometry in the Dynamic Shear Rheometer for Low Temperature Evaluation of Asphalt Binders

2019 ◽  
Vol 2673 (11) ◽  
pp. 649-659 ◽  
Author(s):  
Ramez Hajj ◽  
Angelo Filonzi ◽  
Syeda Rahman ◽  
Amit Bhasin
Keyword(s):  
Low Temperature ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Asphalt Pavements ◽  
Dynamic Shear ◽  
Dynamic Shear Rheometer ◽  
Reclaimed Asphalt ◽  
Load Response ◽  
Linear Viscoelastic ◽  
Analytical Approaches

The low-temperature properties of asphalt binder have attracted attention in recent years thanks to an increase in the use of reclaimed asphalt pavements (RAP). Traditional methods to evaluate the low-temperature properties of the binder require a large amount of binder that needs to be recovered from RAP samples for testing with a Bending Beam Rheometer (BBR). To economize on sample size for RAP materials and also for emulsion residues, previous researchers have explored the potential of using a 4 mm diameter specimen with a Dynamic Shear Rheometer (DSR) in lieu of the BBR. To compare results from frequency sweep tests conducted using the DSR with results from the BBR, data from the former need to be converted to time domain and subsequently from a shear load response to an axial load response. Previous research studies have developed methods to accomplish these two conversions to compare data from the DSR with data from the BBR. The objective of this study is to examine some of these methods from the literature and elsewhere based on the principles of linear viscoelastic interconversion using a set of 11 different binders. Results using different analytical approaches from this study show that the DSR has good repeatability and verify that it can be used as a surrogate for the BBR to determine low-temperature properties, while exercising some caution with some of the assumptions related to Poisson’s ratio.

An Alternative Experimental Method for Measuring the Low Temperature Rheological Properties of Asphalt Binder by Using 4mm Parallel Plates on Dynamic Shear Rheometer

2019 ◽  
Vol 2673 (3) ◽  
pp. 427-438 ◽  
Author(s):  
Di Wang ◽  
Augusto Cannone Falchetto ◽  
Alexander Alisov ◽  
Johannes Schrader ◽  
Chiara Riccardi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Rheological Properties ◽  
Experimental Method ◽  
Complex Modulus ◽  
Testing Procedure ◽  
Asphalt Binders ◽  
Rheological Parameters ◽  
Parallel Plates ◽  
Dynamic Shear ◽  
Dynamic Shear Rheometer

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 was also developed. Five different asphalt binders, which are part of two active research projects, were selected. Frequency and temperature sweep tests were conducted using the DSR with three plate–plate geometries: 4 mm, 8 mm, and 25 mm. The new testing procedure was used to measure at low temperatures. The method recently proposed by the Western Research Institute and based on DSR tests with 4 mm parallel plates and 1.75 mm gap was also used for comparison purposes. Black diagrams and Cole-Cole plots were then used to evaluate the experimental data. Complex modulus and phase angle master curves were generated, and the rheological parameters compared. Finally, the two spring, two parabolic elements, one dashpot (2S2P1D) model was selected to investigate the rheological properties of the binders. Results indicate that the proposed procedure is a simple and reliable experimental method and represents an alternative experimental option to measure and analyze the rheological properties of asphalt binders at low temperature.

Comparative Study on Water Aging of Rubber Asphalt and TOR Rubber Asphat

2012 ◽  
Vol 178-181 ◽  
pp. 1383-1386 ◽  
Author(s):  
Peng Xiao ◽  
Mei Ping Wu ◽  
Shan Shan Shi ◽  
Dean Jiang
Keyword(s):  
High Temperature ◽  
Sodium Chloride ◽  
Low Temperature ◽  
Ph Value ◽  
Chloride Content ◽  
Dynamic Shear ◽  
Bending Beam Rheometer ◽  
Temperature Performance ◽  
Aging Properties ◽  
Better Than

Brookfield Viscometer, Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) are employed to analyze properties of rubber asphalt and TOR rubber asphalt after water aging. Through simulating, the influences of parameter changes of water on the performances of asphalts after aging were studied. The results show that the PH value and sodium chloride content of water affects the aging properties of asphalt, and as the parameter changes, the high temperature performance of TOR rubber asphalt are better than rubber asphalt. DSR and BBR tests reveal that the higher the acidity (or the lower PH value) and the sodium chloride content of water are, the more seriously rubber asphalt and TOR rubber asphalt age in water aging; the lower the temperature is, the larger the S value and the smaller the m value become, and the worse the low temperature performance and dissipation of temperature stress of rubber asphalt and TOR rubber asphalt get.

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