scholarly journals Evaluation of the Durability and the Property of an Asphalt Concrete with Nano Hydrophobic Silane Silica in Spring-Thawing Season

2018 ◽  
Vol 8 (9) ◽  
pp. 1475 ◽  
Author(s):  
Wei Guo ◽  
Xuedong Guo ◽  
Mingzhi Sun ◽  
Wenting Dai
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Binder ◽  
Damage Model ◽  
Degree Theory ◽  
Short Term ◽  
Effective Technique ◽  
Modified Asphalt ◽  
Damage Process ◽  
Hydrophobic Silane ◽  
Pavement Damage

In the spring-thawing season, the high frequency of freeze-soak-scour cycles in the short term is the main cause of pavement damage in the frozen region. One of the methods to improve the durability of asphalt concrete in spring-thawing season is to add suitable modifiers and additives which improve adhesion between asphalt binder and aggregate. This study evaluates the effect of nano hydrophobic silane silica (NHSS) on the performance damage of asphalt concrete (AC) in spring-thawing season. The effectiveness of nano hydrophobic silane silica was evaluated by conducting mixture tests after different freeze-soak-scour cycles, and the damage model of NHSS modified asphalt concrete was established based on the logistic damage model. The results showed that adding NHSS is an effective technique for mitigating freeze-soak-scour cycle damage of asphalt concrete in spring-thawing season. Moreover, the influence of scour, soak, and freeze—three separate factors on NHSS-modified AC in spring-thawing season—was discussed based the gray rational degree theory. The results illustrated that the freeze factor had a more significant impact on the damage process of NHSS modified asphalt concrete compared with the soak and scour factor.

scholarly journals Laboratory Assessment of Deteriorating Performance of Nano Hydrophobic Silane Silica Modified Asphalt in Spring-Thaw Season

2019 ◽  
Vol 9 (11) ◽  
pp. 2305 ◽  
Author(s):  
Wei Guo ◽  
Xuedong Guo ◽  
Wuxing Chen ◽  
Yingsong Li ◽  
Mingzhi Sun ◽  
...  
Keyword(s):  
Aging Process ◽  
Damage Model ◽  
Asphalt Mixture ◽  
Physicochemical Characteristics ◽  
Laboratory Assessment ◽  
Main Research ◽  
Modified Asphalt ◽  
Freeze Thaw ◽  
Hydrophobic Silane ◽  
Pavement Damage

In the seasonal frozen regions, freeze-thaw (F-T) damage is the main pavement damage, causing a variety of poor conditions in bitumen pavement, such as cracks, pits, potholes, and slush. In previous studies, we evaluated the effect of nano hydrophobic silane silica (NHSS) on the degradation of asphalt mixture under F-T cycles, and established the damage model of NHSS modified asphalt mixture in spring-thawing season. To gain more understanding of the influence of NHSS on asphalt in spring-thawing season, NHSS modified asphalt was systematically analyzed under F-T aging process in this study. The main research objective of this paper was to investigate the deteriorating properties of NHSS modified asphalt under Freeze-thaw aging process. Within this article, the physicochemical characteristics of NHSS modified asphalt were determined by using various laboratory tests, which included basic property test, dynamic shear rheometer test (DSR), Fourier transform infrared spectroscopy test (FTIR) and thermogravimetric analysis (TGA). The results showed that the incorporation of NHSS could inhibit the F-T aging process of asphalt. Moreover, the chemical composition and thermal stability of asphalt under F-T aging process was analyzed through FITR and TGA test parameters. The results illustrated that the sulfoxide functional groups content index was more suitable for evaluating the aging degree of asphalt in the spring-thawing season and the F-T aging process had a great impact on the thermal property of NHSS modified asphalt.

scholarly journals Investigation of the Effect of Induction Heating on Asphalt Binder Aging in Steel Fibers Modified Asphalt Concrete

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1067 ◽  
Author(s):  
Hechuan Li ◽  
Jianying Yu ◽  
Shaopeng Wu ◽  
Quantao Liu ◽  
Yuanyuan Li ◽  
...  
Keyword(s):  
Induction Heating ◽  
Asphalt Concrete ◽  
Asphalt Binder ◽  
Steel Fibers ◽  
Asphalt Binders ◽  
Carbonyl Index ◽  
Modified Asphalt ◽  
Concrete Damage ◽  
The Difference ◽  
Binder Aging

Induction heating is a valuable technology to repair asphalt concrete damage inside. However, in the process of induction heating, induced particles will release a large amount of heat to act on asphalt binder in a short time. The purpose of this paper was to study the effect of induction heating on asphalt binder aging in steel fibers modified asphalt concrete. The experiments were divided into two parts: induction heating of Dramix steel fibers coated with asphalt binder (DA) and steel wool fibers modified asphalt concrete. After induction heating, the asphalt binders in the samples were extracted for testing aging indices with Fourier Transform Infrared (FTIR), Dynamic Shear Rheometer (DSR), and Four-Components Analysis (FCA) tests. The aging of asphalt binder was analyzed identifying the change of chemical structure, the diversification of rheological properties, and the difference of component. The experiments showed that the binder inside asphalt concrete began aging during induction heating due to thermal oxygen reaction and volatilization of light components. However, there was no peak value of the carbonyl index after induction heating of ten cycles, and the carbonyl index of DA was equivalent to that of binder in asphalt concrete after three induction heating cycles, which indicated the relatively closed environment inside asphalt concrete can inhibit the occurrence of the aging reaction.

scholarly journals Influence of Additives on the Fatigue Life and Stiffness of Asphalt Concrete

2021 ◽  
pp. 8-15
Author(s):  
Saad I. Sarsam
Keyword(s):  
Fatigue Life ◽  
Fly Ash ◽  
Asphalt Concrete ◽  
Concrete Beam ◽  
Asphalt Binder ◽  
Flexural Stiffness ◽  
Beam Test ◽  
Modified Asphalt ◽  
Wet Process ◽  
Modified Binder

Implementation of additives to the asphalt binder can enhance the overall physical properties of the modified asphalt concrete. In the present assessment, an attempt has been made to use 2 % of silica fumes and 4 % of fly ash class F for modification of asphalt binder in wet process. Asphalt concrete wearing course mixtures have been prepared and compacted by roller in the laboratory. The beam specimens of 400 mm length and 50 mm height and 63 mm width were extracted from the slab samples. The specimens were subjected to the four-point repeated flexural bending beam test. The flexural stiffness was calculated under three constant micro strain levels of (250, 400, and 750). The fatigue life was monitored in terms the number of load repetitions to reach the required reduction in stiffness. It was concluded that the flexural stiffness increases by (11, and 15) %, (17.7, and 63.6) %, (57.2, and 65) % when 2% of silica fumes or 4 % of fly ash are implemented and the specimen’s practices 750, 400, and 250 microstrain levels respectively. However, the fatigue life of asphalt concrete beam specimens increases by (40, and 72.8) %, (115, and 220.6) %, (46, and 94.6) % when 2% of silica fumes or 4 % of fly ash are implemented and the specimen’s practices 750, 400, and 250 microstrain levels respectively. It is recommended to use modified binder with fly ash and silica fumes in asphalt concrete to enhance the fatigue life and stiffness.

High-temperature performance of gilsonite-modified asphalt binder and asphalt concrete

2016 ◽  
Vol 34 (21) ◽  
pp. 1783-1789 ◽  
Author(s):  
Aliasghar Akbari Nasrekani ◽  
Koorosh Naderi ◽  
Mostafa Nakhaei ◽  
Nader Mahmoodinia
Keyword(s):  
High Temperature ◽  
Asphalt Concrete ◽  
Asphalt Binder ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Modified Asphalt Binder

Effect of Antioxidant Characteristic from Waste Cooking Oil in Modified Asphalt Binder

2016 ◽  
Vol 700 ◽  
pp. 197-206 ◽  
Author(s):  
Wan Nur Aifa Wan Azahar ◽  
Mastura Bujang ◽  
Ramadhansyah Putra Jaya ◽  
Mohd Rosli Hainin ◽  
Norzita Ngadi ◽  
...  
Keyword(s):  
Aging Process ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Waste Cooking Oil ◽  
Short Term ◽  
Aging Rate ◽  
Modified Asphalt ◽  
Cooking Oil ◽  
Modified Asphalt Binder

Aging process especially in asphalt binder material can occur throughout the life cycle of asphalt pavement starting from mixing, placement and during the service life. During this process, the more stiffer and brittle of asphalt binder is produced due to age hardening and gives an indication of initial factor of deterioration in asphalt pavement. A number of noteworthy researchers have focused on oil based modification to produce modified asphalt binder by using Waste Cooking Oil (WCO), due to the presence of natural antioxidant properties possessed in WCO. Antioxidant has played the role as an oxidative inhibition and has the potential to minimize the aging rate to occur. The aging process is conducted by separating between short term and long term aging where short term oxidative aging of binders was simulated using rolling thin film oven (RTFO) while long term aging was performed using pressure aging vessel (PAV). The laboratory evaluation was carried out to investigate the relationship between the qualities of WCO that affect the availability of antioxidant amount towards the susceptibility of aging rate by conducting Dynamic Shear Rheometer (DSR). The result from rheological studies demonstrated that the lowest Aging Index (AI) is presented as 2.14, 2.18 and 1.79 for replacement by using WCO in December sample at concentration of 3%, 4% and 5% for short term aging while AI at 3% = 5.17 and 5% = 7.22 for long term aging. Therefore, the high quality of oil represented by WCO in December sample has indicated the high availability of antioxidant content that can minimize the aging susceptibility in the asphalt binder modified by WCO.

scholarly journals Study on Styrene-Butadiene-Styrene Modified Asphalt Binders Relaxation at Low Temperature

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2888
Author(s):  
Sylwia Dziadosz ◽  
Mieczysław Słowik ◽  
Filip Niwczyk ◽  
Marcin Bilski
Keyword(s):  
Low Temperature ◽  
Force Measurement ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Short Term ◽  
Modified Bitumen ◽  
Modified Asphalt ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

The paper presents the results of laboratory investigation on asphalt binders relaxation at low temperature, carried out in a ductilometer using the tensile test with continuous force measurement. Polymer modified asphalt binder samples consisting of a 50/70 penetration grade bitumen mixed with a concentrate of styrene-butadiene-styrene (SBS) modified bitumen—a 160/220 penetration grade bitumen modified with a SBS copolymer in the amount of 9%—were tested. Therefore, polymer modified binders containing 3%, 4.5%, 6% and 7.5% SBS, respectively, were obtained and investigated. Tensile tests were performed at −16 °C on samples before aging and subjected to short-term aging (RTFOT). Test results in the form of relaxation curves have been mathematically described using a modified generalized Maxwell model. Based on the acquired results, it was shown that the increase of the SBS copolymer content in asphalt binder precipitates the relaxation process, while aging slows down this phenomenon. It has also been proven that with increased content of SBS elastomer in asphalt binder, the effect of short-term aging on binder’s stress relaxation ability at low temperatures is reduced.

Fracture Morphology and Fracture Toughness Measurement of Polymer-Modified Asphalt Concrete

1997 ◽  
Vol 1590 (1) ◽  
pp. 23-33 ◽  
Author(s):  
Alekh S. Bhurke ◽  
E. Eugene Shin ◽  
Lawrence T. Drzal
Keyword(s):  
Fracture Toughness ◽  
Network Structure ◽  
Asphalt Concrete ◽  
Asphalt Binder ◽  
Fracture Morphology ◽  
Engineering Properties ◽  
Modified Asphalt ◽  
Fracture Toughness Measurement ◽  
Styrene Butadiene ◽  
Toughness Measurement

Pavement distress occurs through a variety of mechanisms, but it is always controlled by the adhesive and cohesive performance of the asphalt binder. Although the causes of pavement failures are known, the precise mechanisms by which they occur remain to be understood. Observation of the fracture morphology of asphalt concrete can provide some information in this respect. The fracture morphology of asphalt concrete is dependent on the morphology of the binder. A network structure was observed in thin asphalt binder films and the fracture morphology and engineering properties of asphalt concrete were found to be dependent on the network morphology of the asphalt binder. Addition of polymers to asphalt binders causes changes in the nature of the network structure, and its effect can be qualitatively determined by characterizing the fracture morphology. Styrene butadiene styrene (SBS), styrene ethylene butylene styrene (SEBS), styrene butadiene rubber (SBR) latex and an epoxy-terminated reacting polyolefin (Elvaloy AM) were used in this study. A quantitative method to determine the effect of polymer modification on the fracture properties of asphalt concrete is the J-contour integral fracture toughness measurement. An experimental protocol to measure the critical J-integral fracture toughness ( J1 c) was developed and the low temperature (-10°C) J1 c values were determined for SEBS and Elvaloy AM-modified asphalt concrete at three different concentrations.

scholarly journals Evaluation of the Impact of Short-Term Aging on Volumetric and Marshall Properties of Palm Oil Clinker Fine Modified Asphalt Concrete (POCF-MAC)

2021 ◽  
Vol 1793 (1) ◽  
pp. 012054
Author(s):  
N S A Yaro ◽  
M Napiah ◽  
M H Sutanto ◽  
A Usman ◽  
A D Rafindadi ◽  
...  
Keyword(s):  
Palm Oil ◽  
Asphalt Concrete ◽  
Short Term ◽  
Modified Asphalt ◽  
The Impact

Fracture toughness of polymer-modified asphalt concrete at low temperatures

2003 ◽  
Vol 30 (2) ◽  
pp. 406-413 ◽  
Author(s):  
Kwang W Kim ◽  
Seung Jun Kweon ◽  
Young S Doh ◽  
Tae-Soon Park
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Asphalt Concrete ◽  
Low Temperatures ◽  
Asphalt Binder ◽  
Polymer Modification ◽  
Modified Asphalt ◽  
Temperature Damage ◽  
Polymer Modified Asphalt ◽  
Styrene Butadiene

The fracture toughness of asphalt concrete increases at low temperature and then decreases at temperatures below a certain level. Some polymers are known to have the property of improving the temperature susceptibility of asphalt binder at low temperatures. Therefore, this study evaluated the fracture toughness (KIC) of some polymer-modified asphalt concretes. Low-density polyethylene (LDPE), styrene–butadiene–styrene (SBS), and a mixed polymer of LDPE and SBS were used in this study. The fracture toughness KIC of normal asphalt concrete was compared with that of polymer-modified asphalt (PMA) concrete, and the effectiveness of polymer modification against falling values of KIC was evaluated at low temperatures. The results showed that PMA concretes, in general, showed better KIC than normal asphalt concretes, and the temperature at which the highest KIC was obtained was lower than that in the case of normal asphalt concrete. Therefore, the PMA concretes evaluated in this study had better fracture resistance than normal asphalt at low temperatures.Key words: asphalt concrete, polymer-modified asphalt, PMA, fracture toughness, differential thermal contraction, low-temperature damage.

scholarly journals Characterization of the Adhesive and Cohesive Moisture Damage for Asphalt Concrete

2019 ◽  
Author(s):  
Mona Nobakht
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Binder ◽  
Damage Model ◽  
Moisture Diffusion ◽  
Adhesive Bond ◽  
Moisture Damage ◽  
Asphalt Mixtures ◽  
Asphalt Pavements ◽  
Dynamic Modulus Test ◽  
Early Degradation

Durability of asphalt concrete is significantly influenced by moisture damage, resulting in early degradation of asphalt pavements. There are several tests and conditioning methods adopted by agencies and researchers to identify the susceptibility of asphalt mixtures to the moisture damage. However, there is a need to develop predictive models that account for the impacts of moisture on fundamental mechanistic properties of asphalt concrete. In this regard, the focus of this paper is to develop an adhesive and a cohesive moisture damage model that enable the prediction of the amount of induced damages due to the moisture diffusion in the asphalt concrete. The models are developed based on intermolecular bond energy/force, and the mechanisms of cohesive and adhesive failures. They assume water vapor diffusion as the dominant moisture transport mode in asphalt pavements. The models are calibrated and validated by conducting dynamic modulus test on Fine Asphalt Matrix mixtures as well as Bitumen Bond Strength test on the adhesive bond between aggregate and asphalt binder. The results of validation process show the competence of the proposed models in predicting the adhesive and cohesive moisture damage of asphalt mixtures.

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