Research on Performance of Sasobit Warm Mix Asphalt and Influence of Aging Using DSR

2011 ◽  
Vol 128-129 ◽  
pp. 426-429 ◽  
Author(s):  
Hai Zhao
Keyword(s):  
Shear Modulus ◽  
Phase Angle ◽  
Warm Mix Asphalt ◽  
Dynamic Shear ◽  
Complex Shear Modulus ◽  
Dynamic Shear Rheometer ◽  
Complex Shear

In order to study the performance of Sasobit warm mix asphalt and the influence of aging, complex shear modulus G* and phase angle δ of Sasobit warm mix asphalt are tested by Dynamic Shear Rheometer （DSR） at different aging phase, to analyze the effects of Sasobit to the performance and the aging of 70# and SBS asphalt. The results show that with the increasing of the dosage of Sasobit, the value of G*/sinδ can be increased at different aging phase, the change in the phase angle has the same trend; the degree of Long-term aging of warm-matrix asphalt is larger than modified asphalt's. This may be related to the interaction of Sasobit and modifier.

scholarly journals Evaluation of Rheological Characteristics of Graphite Modified Bitumen

2021 ◽  
Vol 11 ◽  
pp. 51-57
Author(s):  
Odunayo Olayemi Oladunjoye ◽  
Olugbenga Joseph Oyedepo ◽  
Ebenezer Omoniyi Olukanni ◽  
Sombo Philiph Akande
Keyword(s):  
Shear Modulus ◽  
Phase Angle ◽  
Dynamic Viscosity ◽  
Loss Modulus ◽  
Rheological Parameters ◽  
Dynamic Shear ◽  
Complex Shear Modulus ◽  
Modified Bitumen ◽  
Dynamic Shear Rheometer ◽  
Complex Shear

The level of performance of asphalt concrete has a close relationship with the properties of bitumen used. This research evaluates the rheological parameters of graphite modified bitumen. Index properties tests were conducted on bitumen and graphite to determine their suitability. Dynamic viscosity and dynamic shear rheometer were conducted on bituminous binder modified with four different proportion of graphite ranging from 2% to 10% by bitumen weight. Dynamic viscosity test was conducted on bitumen and graphite modified bitumen at temperature of 1350C and 1650C using Brookfield Viscometer. The rheological properties are centered on phase angle (δ) and complex shear modulus (G*) which were determined on bitumen and graphite modified bitumen at temperature ranging from 520C – 700C at 10 rad/s frequency using Dynamic Shear Rheometer in accordance with ASTM D7175-15. The storage modulus (G'), loss modulus (G") and rutting parameters were then evaluated from phase angle and complex shear modulus. The bitumen and graphite modified bitumen showed that graphite modified bitumen has the highest complex shear modulus and rutting parameter of 8984 (kPa) and 33387 (kPa) at 10% graphite content. The results of viscosity helped to determine the mixing and compaction temperatures. Dynamic shear rheometer test results determined the elastic and viscous behaviour at various temperature. The higher the complex shear modulus and rutting parameter the stiffer the binder will resist deformation and rutting.

Preliminary Evaluation of Field Aging Characteristic of Warm Mix Asphalt

2013 ◽  
Vol 723 ◽  
pp. 149-156 ◽  
Author(s):  
Shih Hsien Yang ◽  
Anthony Keita
Keyword(s):  
Resilient Modulus ◽  
Warm Mix Asphalt ◽  
Preliminary Evaluation ◽  
Dynamic Shear ◽  
Complex Shear Modulus ◽  
Weather Information ◽  
Indirect Tensile Test ◽  
Complex Shear ◽  
Indirect Tensile

This study is aimed at evaluating the rate of long-term aging of WMA compared to conventional hot-mix-asphalt (HMA). A test section with recorded traffic and weather information was designated in this study. Field cores of two WMAs and one conventional HMA were taken from the field periodically. Both mix and binder properties of retrieved were measured in the laboratory. The resilient modulus and indirect tensile test were performed to characterize mixture properties. The rheological properties of extracted binder were measured by the dynamic shear rheometer (DSR) in order to obtain the complex shear modulus (G*) as well as the phase angle (δ) of binder with and without the WMA additives.

Evaluating Tack Properties of Trackless Tack Coats Through Dynamic Shear Rheometer

2017 ◽  
Vol 2632 (1) ◽  
pp. 119-129 ◽  
Author(s):  
Ah Young Seo ◽  
Maryam S. Sakhaeifar ◽  
Bryan T. Wilson
Keyword(s):  
Shear Modulus ◽  
Dynamic Shear ◽  
Complex Shear Modulus ◽  
Dynamic Shear Rheometer ◽  
Frequency Sweep ◽  
Asphalt Overlay ◽  
Significant Difference ◽  
Complex Shear ◽  
Different Temperatures ◽  
Frequency Sweep Test

Tracking of traditional tack coat materials is a common concern during hot-mix asphalt overlay construction. This problem can be avoided by using trackless tacks, which are recently developed tack products that resist sticking to tires. Thus loss of tack materials from the paving surface is preventable. Various trackless tack products have been introduced to the market; however, there is still a lack of evaluation on their tracking resistance. The objective of this study was to measure the rheological and tack properties of trackless tack materials through the dynamic shear rheometer. Six trackless tacks and a traditional tack were evaluated. To identify rheological characteristics, the dynamic shear rheometer frequency sweep test was performed on the tack residues. Also, the modified dynamic shear rheometer tackiness test was conducted on both tack emulsions and residue at different temperatures. The emulsion samples were tested throughout the curing period. The tack samples were categorized into soft and stiff binder groups with respect to complex shear modulus obtained from the frequency sweep test. The tack energy was estimated to quantify the stickiness in the tackiness test. A significant difference in tack energy was observed between soft and stiff group binders. The stiffness of the investigated tack materials with respect to the complex shear modulus is well correlated with the tack material properties.

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