The Effects of Salt on Rheological Properties of Asphalt after Long-Term Aging

Limited studies in recent years have shown that asphalt pavement subject to seawater in coastal regions or deicing salt in cold regions may be seriously damaged after being soaked in saline water for a long time. However, there is limited research into the influence of salt on rheological properties of asphalt after long-term aging. In this study, rheological properties of unmodified and polymer-modified asphalt after long-term aging were tested after being soaked in different concentrations of salt (0.3%~5%) for different durations (1 day~30 days). Orthogonal array based on the Taguchi method was used for experimental design. The frequency sweep tests were performed on the specimens of aged asphalt after being soaked for complex modulus and phase angle master curves and ultimate fatigue temperature. BBR tests were performed for stiffness. The test results indicate that saline water appears to reduce low temperature properties and fatigue resistance properties and improved high temperature properties of aged asphalt, and it also affects the sensitivity of complex modulus and phase angles at low frequencies.

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Correlating Long-Term Chip Seals Performance and Rheological Properties of Aged Asphalt Binders

Journal of Materials in Civil Engineering ◽

10.1061/(asce)mt.1943-5533.0001487 ◽

2016 ◽

Vol 28 (5) ◽

pp. 04015190 ◽

Cited By ~ 4

Author(s):

Readul Mohammad Islam ◽

William “Bill” King ◽

Nazimuddin M. Wasiuddin

Keyword(s):

Rheological Properties ◽

Asphalt Binders ◽

Aged Asphalt ◽

Chip Seals

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Mechanistic-empirical evaluation of specific polymer-modified asphalt binders effect on the rheological performance

Science Progress ◽

10.1177/0036850420959876 ◽

2020 ◽

Vol 103 (4) ◽

pp. 003685042095987

Author(s):

Ghazi G Al-Khateeb ◽

Waleed Zeiada ◽

Mohammed Ismail ◽

Ahmad Shabib ◽

Adel Tayara

Keyword(s):

Rheological Properties ◽

Laboratory Tests ◽

Complex Modulus ◽

Heavy Traffic ◽

Asphalt Binder ◽

Empirical Evaluation ◽

Asphalt Binders ◽

Modified Asphalt ◽

Pavement Structures ◽

Polymer Modified Asphalt

Major distresses such as rutting, fatigue, and thermal cracking are facing asphalt pavement structures due to continuous heavy traffic loading and climate change. The modification of asphalt binders (one of the main components of the asphalt paving mix) has the potential to mitigate distresses through using different additives. Polymer modified asphalt (PMA) binders showed a noticeable resistance to pavement distresses as reported in previous studies. The present study aims to evaluate the effect of polymer modification on the rheological properties of asphalt binders through laboratory tests. The polymers included styrene-butadiene-styrene (SBS) and epolene emulsifiable (EE2) types. The 60/70 binder was used as a control for comparison. The Mechanistic-Empirical Pavement Design Guide (MEPDG) was also utilized to simulate the effect of PMA binders on the rheological properties under different climatic conditions and structural capacities. Additionally, the MEPDG was further utilized to compare the effect of asphalt binders on rheological properties using four different binder input levels. Findings of the study showed that laboratory tests experienced varying outcomes regarding the most efficient asphalt binder by means of distresses resistance. However, the MEPDG evaluation showed that the overall ranking of asphalt binders positively impacting the rheological properties was as following: (1) 4.5% EE2 PMA, (2) 4% EE2 PMA, (3) 60/70 binder, (4) 5% SBS PMA, and (5) 4% SBS PMA binders. Furthermore, statistical analysis illustrated that the effect of using different binder input levels on the performance of pavement varied relatively to the evaluated distresses. The analysis showed that using different binder input levels would affect, to a certain extent, the asphalt binder influence on rheological properties only when evaluating rutting and fatigue distresses. Therefore, it is recommended that precise asphalt binder inputs, that is, shear complex modulus (G*) and phase angle (δ) are used when designing pavement structures in regions with hot and mild climate conditions.

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Effect of long-term laboratory aging on rheological properties and cracking resistance of polymer-modified asphalt binders at intermediate and low temperature range

Construction and Building Materials ◽

10.1016/j.conbuildmat.2019.07.206 ◽

2019 ◽

Vol 226 ◽

pp. 767-777 ◽

Cited By ~ 9

Author(s):

Hanyu Zhang ◽

Gang Xu ◽

Xianhua Chen ◽

Rui Wang ◽

Kairen Shen

Keyword(s):

Low Temperature ◽

Rheological Properties ◽

Asphalt Binders ◽

Cracking Resistance ◽

Modified Asphalt ◽

Temperature Range ◽

Polymer Modified Asphalt

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Effect of Ageing on Rheological Properties of Asphalt

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.891.185 ◽

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.

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Long-term aging effect on rheological properties of combined binders from various polymers with ground tire rubber

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2015-0193 ◽

2016 ◽

Vol 43 (5) ◽

pp. 451-460 ◽

Cited By ~ 5

Author(s):

Ouming Xu ◽

Feipeng Xiao ◽

Serji N. Amirkhanian ◽

Yamin Liu ◽

Sen Han

Keyword(s):

Rheological Properties ◽

Fatigue Resistance ◽

Aging Effect ◽

Creep Recovery ◽

Test Results ◽

Tire Rubber ◽

Ground Tire Rubber ◽

Modified Binders ◽

Modified Binder

The objective of this study is to evaluate the long-term aging effect on the rheological properties of the modified PG 76-22/PG 76-16 binders produced from ground tire rubber (GTR) with various polymers after a long-term aging process. The tests included the investigation of G*sinδ, phase angle, amplitude sweep, frequency sweep, creep and creep recovery and stress relaxation in terms of three base binders and five polymers. The test results indicated that both base binder and polymer type affect the fatigue resistance, creep and creep recovery, viscoelastic property, and relaxation characteristic of each modified binder. In addition, terminally blended GTR binder has better fatigue resistance than laboratory blended GTR binder after a long-term aging procedure in this study. It seems that binders modified with polyphosphoric acid combined with 7% GTR exhibit more elastic properties and better rheological properties than other modified binders regardless of binder sources.

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Investigation of the Effect of Long-Term Contact on Adhesion Force in Polycrystalline MEMS Devices

Volume 4: 24th Design for Manufacturing and the Life Cycle Conference; 13th International Conference on Micro- and Nanosystems ◽

10.1115/detc2019-97839 ◽

2019 ◽

Author(s):

Mazen M. Othayq ◽

Nino Giganti ◽

Mohammad Shavezipur

Keyword(s):

Adhesion Force ◽

Silicon Surfaces ◽

Native Oxide ◽

Test Results ◽

Mems Devices ◽

Short Term ◽

Covalent Bonds ◽

Long Time ◽

Contact Adhesion

Abstract The effect of long-term contact on adhesion force between MEMS silicon surfaces is investigated. A test structure is developed that can initiate the contact between the two surfaces without actuation. Therefore, the surfaces may remain in contact for a long period of time. The contacting surfaces are separated using a thermal actuator and the adhesion force is determined utilizing FEM simulations. Freshly released and long-time stored devices were tested, and their adhesion force is determined. The test results show that the adhesion force for devices in contact for a long time is drastically larger than those with short-term contact. Adhesion force values as large as 2.9 μN for long-term contact and as small as 0.4 μN for fresh contact were measured. The large adhesion force associated with long-term contact is believed to be attributed to the formation of native oxide at contacting nano-asperities and formation of covalent bonds between the surfaces, requiring larger force to break the bonds.

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Short-Term and Long-Term Aging Behavior of Rubber Modified Asphalt Paving Mixture

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198196153000102 ◽

1996 ◽

Vol 1530 (1) ◽

pp. 11-17 ◽

Cited By ~ 17

Author(s):

Robert Y. Liang ◽

Suckhong Lee

Keyword(s):

Complex Modulus ◽

Resilient Modulus ◽

Crumb Rubber ◽

Test Results ◽

Aging Behavior ◽

Short Term ◽

Modified Asphalt ◽

Modified Binders ◽

Asphalt Paving

Aging of asphalt has been an important subject area that has received extensive studies in recent years. Test results of short-term and long-term aging behavior of crumb rubber modifier (CRM) modified asphalt paving materials are presented. Eighteen combinations of CRM modified binders in terms of CRM size, CRM content, and base asphalt cement grade were studied by Brookfield viscometer test and dynamic shear rheometer test. The short-term aged binders were prepared using thin film oven test. Viscosity was measured at 350°F in the Brookfield thermosel after mixing at 375°F for 2 hr. The test results showed that the size and percentage of CRM affected the viscosity development in the modified binders: the smaller the CRM size and the higher the CRM content, the higher the viscosity measured after 2-hr reaction at 375°F. Short-term aging exerted more viscosity increase in the CRM modified binders than in the unmodified binders. Modified binders showed less weight loss than unmodified binders. The modified binders showed higher complex modulus G* than unmodified. Short-term aging increased G*, with modified binders exhibiting higher increase. The Marshall mix design yielded various CRM modified mixes. The result of indirect tensile strength tests showed that short-term and long-term aging increased the measured tensile strengths. The resilient modulus test results, in general, supported the general understanding that aging tended to increase resilient modulus.

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Influence of Rejuvenator Materials on Rheological Properties of Asphalt Mortar under Different Aging Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.599.168 ◽

2014 ◽

Vol 599 ◽

pp. 168-172

Author(s):

Peng Wang ◽

Pei Da Guo ◽

Pan Pan ◽

Ling Pang ◽

Shao Peng Wu

Keyword(s):

Thin Film ◽

Rheological Properties ◽

Softening Point ◽

Aging Process ◽

Complex Modulus ◽

Oven Test ◽

Point Temperature ◽

Pavement Preservation ◽

Aged Asphalt ◽

Asphalt Mortar

Three types of rejuvenator sealer materials were added into asphalt mortar after thin-film oven test (TFOT) and pressure aging vessel (PAV) aging processes. The performances of both aged mortar and rejuvenator treated mortar were evaluated by means of softening point, temperature sweep tests. Experimental results showed that all of rejuvenator sealer materials can significantly increase phase angle and decrease the softening point and complex modulus of TFOT aged asphalt, which means aged asphalt can be efficiently softened with the rejuvenator materials. However, the influence on PAV aged asphalt was slightly in the same concentration, which has a significantly direction for the pavement preservation.

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Investigation of Rheological Properties of Asphalt Binders Containing Conductive Fillers

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.385-387.753 ◽

2008 ◽

Vol 385-387 ◽

pp. 753-756 ◽

Cited By ~ 3

Author(s):

Shao Peng Wu ◽

Bo Li ◽

Jun Feng Huang ◽

Zhi Fei Liu

Keyword(s):

Rheological Properties ◽

Complex Modulus ◽

Asphalt Binder ◽

Conductive Filler ◽

Asphalt Mixtures ◽

Asphalt Binders ◽

Asphalt Pavements ◽

Strain Sensing ◽

Lower Temperature ◽

Phase Angles

It is currently interesting to use thermal or electrical conductive asphalt mixtures for snow-melting and maintenance of asphalt pavements in winter or strain-sensing application. Graphite is the principal conductive filler for asphalt mixtures. The addition of Graphite not only makes asphalts conductive but also has effects on other properties. Considering the visco-elastic property of asphalt, the effects of graphite on rheological properties of asphalt binders were investigated by Viscosity Test(VT) and Dynamic Shear Rheometer(DSR). The results of Viscosity Test indicate that viscosity of asphalt binder increases with an increasing amount of graphite. And the effect is more prominent at higher amount and lower temperature. It means that graphite makes asphalt binders stiffer. The results from DSR tests present that the values of complex modulus increase while phase angles decrease under a proper amount of graphite. It infers that proper amount of graphite can make asphalt a more elastic like material. And the results of rutting parameter point out that graphite can improve the rutting resistance of asphalts.

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