Micro recovery, aging, and performance grading of emulsified asphalt using UPTiM

2021 ◽  
pp. 344-350
Author(s):  
Alaeddin Mohseni ◽  
Haleh Azari*
Keyword(s):  
And Performance ◽  
Emulsified Asphalt ◽  
Performance Grading

Performance of Virginia’s Early Foamed Warm Mix Asphalt Mixtures

2018 ◽  
Vol 2672 (28) ◽  
pp. 178-189 ◽  
Author(s):  
Stacey D. Diefenderfer
Keyword(s):  
Dynamic Modulus ◽  
Permanent Deformation ◽  
Warm Mix Asphalt ◽  
Department Of Transportation ◽  
High Dynamic ◽  
Repeated Load ◽  
And Performance ◽  
Virginia Department ◽  
Performance Grading ◽  
Air Void

The Virginia Department of Transportation began allowing the use of warm mix asphalt (WMA) in 2008. Although several WMA technologies were investigated prior to implementation, foamed WMA was not. This study evaluated the properties and performance of foamed WMA placed during the initial implementation of the technology to determine whether the technology had performed as expected. Six mixtures produced using plant foaming technologies and placed between 2008 and 2010 were identified and subjected to field coring and laboratory testing. Coring was performed in 2014, resulting in pavement ages from 4 to 6 years. Three comparable hot mix asphalt (HMA) mixtures were cored at 5 years for comparison. Cores were evaluated for air-void contents and permeability and were subjected to dynamic modulus, repeated load permanent deformation, and overlay testing. In addition, binder was extracted and recovered for performance grading. Similar properties were found for the WMA and HMA mixtures. One WMA mixture had high dynamic modulus and binder stiffness, but overlay testing did not indicate any tendency for premature cracking. All binders had aged between two and three performance grades above that specified at construction. WMA binders and one HMA binder aged two grades higher, and the remaining two HMA binders aged three grades higher, indicating a likely influence on aging of the reduced temperatures at which the early foamed mixtures were typically produced. Overall results indicated that foamed WMA and HMA mixtures should be expected to perform similarly.

Rheological Evaluation of Asphalt Cement Derived from Alberta Oil-sand Bitumen at Different Distillation Temperatures

2020 ◽  
Author(s):  
Nura Bala ◽  
Amirhossein Ghasemirad ◽  
Leila Hashemian
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Oil Sands ◽  
Permanent Deformation ◽  
Asphalt Binders ◽  
Oil Sand ◽  
Asphalt Cement ◽  
And Performance ◽  
Oil Sands Bitumen ◽  
Performance Grading

In this study, high, intermediate and low temperature properties of two crude oil asphalts and three asphalts derived from Alberta oil sands bitumen distilled at temperatures of 400 °C, 430 °C and 460 °C were evaluated. High and intermediate temperature properties of the asphalt binders at different distillation temperatures were studied using a dynamic shear rheometer (DSR) through the performance grading (PG) tests. Low-temperature properties and performance grading were evaluated using a bending beam rheometer (BBR). The DSR high-temperature analysis indicated that oil sand bitumens distilled at high temperatures have significantly higher stiffness and more resistant to permanent deformation. BBR test results showed that irrespective of the asphalt source, oil sand bitumens distilled at lower temperatures are more resistant to cracking at low temperatures. The overall results indicate that oil sand bitumens are thus suitable to be used for both asphalt pavements requiring low and high-temperature resistance.

Engineering Properties of Asphalt Binders from Different Sources and Their Influence on Stiffness of Asphalt Concrete Mixtures

2019 ◽  
Vol 2673 (6) ◽  
pp. 396-405
Author(s):  
Alexandra Torres
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Binder ◽  
Engineering Properties ◽  
Asphalt Binders ◽  
Stiffness Properties ◽  
Temperature Ranges ◽  
And Performance ◽  
Nominal Performance ◽  
Performance Grading ◽  
The Impact

The quality and quantity of asphalt binder are crucial for proper adhesion, cohesion, and performance of asphalt concrete (AC) mixtures. The current Superpave grading system for asphalt binders provides engineers with the high and low temperature ranges at which the asphalt binder should perform satisfactorily. The objectives of this study are to document the differences in the performance of different asphalt binders with the same nominal performance grade (PG) acquired from different refineries and to investigate the impact that binder properties may have on the stiffness of the AC mixes. To that end, five PG 64-22 and five PG 70-22 binders were studied. Each binder was graded twice, in the original state and extracted from the mix conditions. The conventional performance grading tests such as the bending beam rheometer, dynamic shear rheometer, pressure aging vessel, and rolling thin-film oven were conducted on all asphalt binders. Alternative binder parameters (e.g., parameter ΔTc, viscosity) that can potentially supplement the current PG system were measured and documented. The stiffness properties of the ten mixes as measured with the dynamic modulus tests were correlated with the measured binder properties. The asphalt binders with the same performance grades yielded different cracking, rutting, and stiffness properties, which may explain the differences in their performance when used to design AC mixes.

scholarly journals A Review on Cement Asphalt Emulsion Mortar Composites, Structural Development, and Performances

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3422
Author(s):  
Hussaini Abdullahi Umar ◽  
Xiaohui Zeng ◽  
Xuli Lan ◽  
Huasheng Zhu ◽  
Yirui Li ◽  
...  
Keyword(s):  
High Speed ◽  
Partial Replacement ◽  
Future Research ◽  
Structural Development ◽  
Asphalt Emulsion ◽  
Performance Properties ◽  
And Performance ◽  
Areas Of Interest ◽  
Emulsified Asphalt ◽  
Ca Mortar

The use of cement emulsified asphalt mortar (CA mortar) in the track structure of high-speed speed railways has been gaining considerations by many researchers due to its coupled merits of the strength of cement as well as the flexibility of asphalt material. The asphalt to cement ratio (A/C) and the compatibility among constituent materials are crucial to the properties of CA mortar. To improve the performance properties and application of CA mortar, it is imperative to have a broad understanding of the composition mechanisms and compatibility between constituent materials. This paper summarizes interesting research outcomes related to the composition and properties of CA mortar. The consumption of water by cement promotes the breakdown of emulsified asphalt, likewise, the adsorption of asphalt droplets on the surface of cement grains retards the hydration process of cement. An appropriate A/C is required for the cement hydration rate to match the speed of demulsification of asphalt emulsion. Depending on the type and properties for which the CA mortar is designed to possess, the A/C ranges from 0.2 to 0.6 for type 1 (CAM I), and 0.6 to 1.2 for type 2 (CAM II). This paper also discusses measures taken to improve performance properties, compatibility, the interaction between constituent materials of CA mortar, and the use of additives as a partial replacement of cement in CA mortar production. The current review also suggests areas of interest for future research studies. This paper is useful to those who aim to understand or study the composition mechanisms and performance properties of CA mortar.

Mechanical-Chemical Characterization of the Effects of Type, Dosage, and Treatment Methods of Rejuvenators in Aged Bituminous Materials

2020 ◽  
Vol 2674 (3) ◽  
pp. 126-138 ◽  
Author(s):  
Gabriel Nsengiyumva ◽  
Hamzeh F. Haghshenas ◽  
Yong-Rak Kim ◽  
Santosh Reddy Kommidi
Keyword(s):  
Chemical Characterization ◽  
Flow Number ◽  
Recycled Asphalt ◽  
Test Analysis ◽  
Treatment Methods ◽  
Bituminous Materials ◽  
And Performance ◽  
Performance Grading ◽  
Binder Level

Proper use of rejuvenators can improve the properties and performance of aged asphalt mixtures; however, there is currently a lack of understanding on how rejuvenator treatment details, such as type-dosage of rejuvenators and blending-curing of rejuvenation, affect properties and performance characteristics. This study aims to investigate the effects of type, dosage, and treatment methods of rejuvenators when added into aged bituminous materials. To meet the goal, three rejuvenators, categorized by their production technology, were selected to improve a high-recycled asphalt pavement mixture by conducting various binder-level and mixture-level tests. For the binder-level testing, the performance grading (PG) method was used to primarily determine proper dosages targeting desired binder grades, and two chemical tests (Fourier-transform infrared spectroscopy and Saturate, Aromatic, Resin and Asphaltene) were conducted to examine chemical characteristics altered by rejuvenation and the further aging process. The selected dosage levels from the binder testing were then applied to mixture-level performance evaluation by conducting two tests: flow number for rutting and semicircular bending fracture for cracking. Test-analysis results indicated that although it can successfully determine the proper dosage range of rejuvenators, PG binder testing is limited to only assessing the effects of rejuvenators on mechanical properties; this can be better aided by integrating chemical characterization that provides a more in-depth material-specific rejuvenation process. Moreover, it appears that rejuvenation methods can alter the performance of aged mixtures. Therefore, the selection of rejuvenators and their implementation into practice should be carried out considering multiple aspects, not only its PG recovery.

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