Influence of Chemical Constituents of Asphalt Binders on Their Rheological Properties

2019 ◽  
Vol 2673 (6) ◽  
pp. 458-466 ◽  
Author(s):  
K. Lakshmi Roja ◽  
Eyad Masad
Keyword(s):  
Rheological Properties ◽  
Chemical Constituents ◽  
High Density ◽  
Asphalt Binders ◽  
Composition Analysis ◽  
Test Results ◽  
Aging Index ◽  
Linear Viscoelastic ◽  
Frequency Sweep Test ◽  
Rheological Test

The goal of this study is to investigate the chemical constituents and rheological properties of three different binders used in the State of Qatar. Binders were designated as WL (source 1, low density), WH (source 1, high density) and AH (source 2, high density). Binder composition analysis was carried out using the saturates, aromatics, resins and asphaltene determinator (SAR-AD) technique. The percentages of saturates, aromatics, resins and asphaltenes were measured, and from those, the total pericondensed aromatics (TPA), absorbance aging index (AAI), and colloidal instability index (CII) were obtained and their relationship to rheological test results was investigated. In the rheological investigation, the linear viscoelastic properties of these binders were evaluated using a frequency sweep test. The rutting characteristics were evaluated using the percentage of recovery and non-recoverable creep compliance values from the multiple stress creep and recovery (MSCR) test, while the fatigue resistance was assessed using the linear amplitude sweep (LAS) test. The WL binder was found to have the highest stiffness, which is associated with the highest TPA content. From the MSCR test, the AH binder had the lowest rut resistance. This binder also had the lowest CII value, which represents the balanced chemical composition of this material. Out of the three binders, WH had the highest AAI value which is related to the least fatigue life as measured in the LAS test.

Rheological Properties of High Grade Asphalt and its Mixture

2014 ◽  
Vol 599 ◽  
pp. 244-247 ◽  
Author(s):  
Qun Shan Ye ◽  
Chang Jian Ye ◽  
Zhi Lin Sun
Keyword(s):  
Rheological Properties ◽  
Dynamic Modulus ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Asphalt Binders ◽  
Test Results ◽  
Complex Shear Modulus ◽  
Complex Shear ◽  
Dynamic Modulus Test

Viscosity test, dynamic shear test, dynamic modulus test and creep test were conducted to investigate the rheological properties of high modulus asphalt and its mixture. Test results indicated that the viscosity of hard grade asphalt could be increased when compared with the ordinary asphalt, especially at high temperatures. The complex shear modulus and dynamic modulus of hard-grade asphalt binder and its mixture were increased, which implied that the stiffness of them was enhanced. Furthermore, the elastically portions for viscoelastic property of asphalt binders were increased, which resulted in the reduction of phase angle for hard grade asphalt binders and mixtures. The rutting parameter for hard-grade asphalt mixture was increased remarkably, which revealed that the resistance to permanent deformation could be significantly improved for hard grade asphalt mixture.

scholarly journals Evaluation of the Rheological Property of Binder-Filler Systems after Oxidation Based on a Simple Film Oven Aging Method

2019 ◽  
Vol 9 (12) ◽  
pp. 2542
Author(s):  
Hongmei Li ◽  
Jiwang Jiang ◽  
Song Li ◽  
Xiang Ma
Keyword(s):  
Rheological Property ◽  
Complex Modulus ◽  
Aging Effect ◽  
Test Results ◽  
Master Curves ◽  
Oxidative Aging ◽  
Aging Index ◽  
Frequency Sweep Test ◽  
Simple Film ◽  
Mineral Aggregates

Asphalt mastic is a combination of binder and filler. The binder-filler system within asphalt mixtures plays an important role in adhesion between mineral aggregates. The aging of binders in pavement always happens with fillers inside or contact with mineral aggregates, so it is critical to investigate the evolved rheological property of binder-filler systems during oxidative aging. In this study, simple film oven aging methods for the aging of mastics (binder-filler system) were conducted and verified by comparing the master-curves of aged mastics at different oven positions or different aging times. The frequency sweep test was performed to measure the changing stiffness of mastics with a different combination of binders and filler contents. Test results show that oven positions could influence the aging effect of the mastics significantly, given the influence of circulation. With increasing aging times, the complex modulus increases while phase angle decreases. Comparing the mastics which were first aged then mixed with mastics which were first mixed then aged, it was observed that fillers inside the binder could accelerate aging of the mastics. Additionally, the aging index of mastics with different combinations showed that both the modification of binders and filler contents could affect the aging rate of the mastics.

Toward efficient sludge processing using novel rheological parameters: dynamic rheological testing

2006 ◽  
Vol 54 (5) ◽  
pp. 17-22 ◽  
Author(s):  
A. Ayol ◽  
S.K. Dentel ◽  
A. Filibeli
Keyword(s):  
Transport Processes ◽  
Rheological Parameters ◽  
Test Results ◽  
Linear Viscoelastic ◽  
Strain Sweep ◽  
Liquid States ◽  
Time Frames ◽  
Rheological Test ◽  
The Relationship ◽  
Slight Deformation

Materials known as complex fluids exhibit a transitional behaviour between their solid and liquid states. Sludges produced at different treatment stages of wastewater treatment are examples of these materials, since they exhibit solid behaviour within shorter time frames and liquid behaviour over longer durations. These sludges can also change from solid-like to liquid-like, or vice versa, when subjected to even a slight deformation; this stems from their complex makeup, which includes both particulate materials and polymeric gels, including both biopolymers and the synthetic polymers used in conditioning them. This paper focuses on two means of quantifying dynamic rheological test results: (1) the linear viscoelastic behaviour (LVE) of sludge samples, as measured by the strain sweep analysis storage (G′) and loss moduli (G″); and (2) the flow curve, which presents the relationship between the shear viscosity and shear rate and determines the yield stress values of samples using the strain sweep test mode. With these methods, sludges can be more accurately characterised, allowing better prediction of their behaviour in treatment and transport processes.

Effects of Sasobit on Rheological Properties of Asphalt Binders

2012 ◽  
Vol 509 ◽  
pp. 136-141
Author(s):  
Zhi Fei Liu ◽  
Jia Ping Liu ◽  
Jin Xiang Hong ◽  
Chong Huang
Keyword(s):  
Melting Point ◽  
Rheological Properties ◽  
Warm Mix Asphalt ◽  
Asphalt Binders ◽  
Test Results ◽  
Dynamic Shear ◽  
Dynamic Shear Rheometer ◽  
Rutting Resistance ◽  
Modified Binders ◽  
Rheometer Test

Research in the laboratory was carried out to determine if addition of warm mix asphalt additive (Sasobit) has potential to reduce the temperature comparison with control mix. To fulfill this purpose five types of asphalt binders have been produced with a Sasobit additive in concentration range from 0 to 10% by weight of the asphalt. Viscosity test and dynamic shear rheometer test are conducted for the investigation of effects of Sasobit on rheological properties characteristics of binders. Viscosity tests on binders indicated that the Sasobit binders had significantly lower viscosities compared to control binders at the temperature above 100°C, indicating that Sasobit can reduce the mixing and compaction temperatures above the melting point of Sasobit. Sasobit modified binders are more sensitive cracking and had more excellent rutting resistance properties at service temperatures compared with original bitumen. Based on the test results, the suggest content of Sasobit addition is 3% by weight.

Research on Rheological Properties of Warm Mix Asphalt Binders

2013 ◽  
Vol 689 ◽  
pp. 363-367
Author(s):  
You Quan Zou
Keyword(s):  
Rheological Properties ◽  
Energy Savings ◽  
Mechanical Analysis ◽  
Warm Mix Asphalt ◽  
Environmental Benefits ◽  
Asphalt Binders ◽  
Frequency Sweep ◽  
Conventional Tests ◽  
Rheological Test ◽  
Dynamic Shearing

Abstract. Warm mix asphalt (WMA) has been gaining increasing popularity in recent years due to energy savings and environmental benefits. Warm mix asphalt reduces the production temperatures (mixing and compaction) while maintains the advantages of hot mix asphalt (HMA). It is becoming an attractive paving material. Therefore, it is important to understand the rheological behavior of asphalt binders changes with temperature and proportion of the additives. In this study, rheological properties of one commonly used binder PG 70-28 were evaluated, with and without additives (Sasobit® and Aspha-Min®) as the warm asphalt additives, by means of conventional tests as well as dynamic mechanical analysis using Dynamic Shearing Rheometer (DSR).The rheological test included viscosity, temperature sweep and frequency sweep.

Effect of Mineral Fillers on Fatigue Resistance and Fundamental Material Characteristics: Mechanistic Evaluation

2003 ◽  
Vol 1832 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Yong-Rak Kim ◽  
Dallas N. Little ◽  
Injun Song
Keyword(s):  
Fatigue Resistance ◽  
Damage Mechanics ◽  
Fatigue Behavior ◽  
Continuum Damage Mechanics ◽  
Hydrated Lime ◽  
Mechanical Tests ◽  
Asphalt Binders ◽  
Test Results ◽  
Linear Viscoelastic ◽  
Mineral Fillers

Complex characteristics of fatigue behavior were evaluated on the basis of test results and their mechanical analyses. The dynamic shear rheometer was used to characterize fundamental linear viscoelastic properties of asphalt binders and mastics. Various dynamic mechanical tests using cylindrical sand–asphalt samples mixed with pure binders, mastics, or both were also performed to estimate viscoelastic characteristics and fatigue behavior. To assess the filler effect, two distinctly compositionally different asphalt binders, AAD-1 and AAM-1, and two fillers, limestone and hydrated lime, were selected. Test results were analyzed using viscoelastic theory, a fatigue prediction model based on continuum damage mechanics, and a rheological composite model. The role of fillers in fatigue resistance was quantified, and induced mechanisms due to filler addition were investigated. The effect of hydrated lime, which is highly binder specific, as a filler was further discussed by comparing test results from hydrated lime filler and test results from limestone filler.

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