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Mohamed Rehan Karim – One of the best experts on this subject based on the ideXlab platform.
investigation on physical properties of waste cooking oil rejuvenated bitumen BinderConstruction and Building Materials, 2012Co-Authors: Hallizza Asli, Esmaeil Ahmadinia, Majid Zargar, Mohamed Rehan KarimAbstract:
Abstract Nowadays, the main problem pertaining to the use of the recycled asphalt pavement (RAP) material in hot mix asphalt (HMA) is the ageing of bitumen, which limits the percentage of applied RAP in the HMA. In this respect, rejuvenation of bitumen Binder is the major but the most costly part of recycling. This paper investigates the novelty of using waste cooking oil (WCO), which is frequently found as a polluting waste material in landfills and rivers from the food industry, to rejuvenate the Bituminous Binder. The physical properties of the original bitumen, aged bitumen and rejuvenated bitumen were measured and compared by the conventional bitumen Binder tests including softening point, penetration and Brookfield viscosity, and statistical analyses were used to assess the results. In general, the results showed that the aged bitumen was rejuvenated by the WCO due to a change in its physical properties, which resemble the physical properties of original bitumen (80/100). The optimum percentage of waste cooking oil for the rejuvenated aged bitumen group of 50/60, 40/50, and 30/40 was recognised by adding 1%, 3–4%, and 4–5% WCO, respectively. The statistical analyses also confirm that there was no significant difference between the original bitumen and rejuvenated bitumen.
Rheological Evaluation of Bituminous Binder Modified With Waste Plastic Material5th International Symposium on Hydrocarbons & Chemistry (ISHC5), 2010Co-Authors: Abdelaziz Mahrez, Mohamed Rehan KarimAbstract:
This research investigates the viscelastic properties of asphalt bitumen modified with waste plastic bottles compared to the ordinary 80/100 bitumen. The contents of modifier will be varied to investigate its effects on the rheological properties of the modified Binders. The Binders were characterized using standard laboratory tests such as penetration test, softening point test, viscosity test and dynamic shear rheometer test. Using the waste plastic materials showed prominent results in improving the viscoelstic properties of ordinary bitumen. The effects waste modifiers influenced significantly the rheological behavior of bitumen by increasing its complex modulus and decreasing phase angle.
Yongrak Kim – One of the best experts on this subject based on the ideXlab platform.
adhesion between steel slag aggregates and Bituminous Binder based on surface characteristics and mixture moisture resistanceConstruction and Building Materials, 2020Co-Authors: Arbara Luiza Riz De Moura, Jamilla Emi Sudo Lutif Teixeira, Renata Antou Simao, Mahdieh Khedmati, Yongrak Kim, Patricio Jose Moreira PiresAbstract:
Abstract Steel slag aggregates (SSA) have shown promising mechanical and physical properties for asphalt concrete application. However, SSA surface characteristics vary depending on the type of slag, which results in different Binder-SSA adhesion that affects moisture damage of asphalt mixtures containing SSA. This study evaluated the adhesion in the Binder-SSA system considering two typical types of slags (i.e. air-cooled blast furnace slag (ACBFS) and Linz-Donawitz steel slag (LD)) using various tests: morphological, physical, chemical, and surface energy measurements. Also, the moisture damage susceptibility of asphalt mixtures containing SSA were assessed based on two standard methods: ASTM D3625 and AASHTO T283. Test results showed strong influence of the SSA chemical composition and surface energy characteristics on the SSA-Binder adhesion. LD showed a better adhesion with the asphalt Binder than ACBFS due to its particular chemical and surface energy characteristics. The diminished adhesive bonding from ACBFS could be improved with proper surface treatment using additives such as hydrated lime and electrostatic precipitator powder, which change surface chemistry of ACBFS.
dynamic shear rheometer testing and mechanistic conversion to predict bending beam rheometer low temperature behavior of Bituminous BinderConstruction and Building Materials, 2020Co-Authors: Santosh Reddy Kommidi, Yongrak KimAbstract:
Abstract The low-temperature rheology of Bituminous Binders is of great interest because low-temperature cracking is one of the primary failure modes of asphaltic pavements in cold-climate region. Low temperature Binder characterization/grading has been primarily conducted using the bending beam rheometer (BBR) which requires much Binder for specimen preparation, labor-intensive and time-consuming to conduct the testing. In contrast, the dynamic shear rheometer (DSR) testing is much easier, faster, and has brought a lot attention to the community because it requires less than one gram per specimen and is applicable for both laboratory-prepared and field-extracted Binder for forensic analysis. This study explored using the DSR to characterize low temperature behavior of Binder. To this end, both DSR and BBR tests were conducted, and the DSR test results were mechanically converted to BBR beam deflection using the elastic-viscoelastic correspondence principle. Two groups of Binders (i.e., twelve Binders from four different sources satisfying three different low temperature grades as one group to investigate the feasibility of the concept, and seven additional Binders to apply the concept to a separate group of Binders as the second group) were selected and tested under the long term aged condition. More specifically, the dynamic frequency sweep test data from DSR were used to obtain the time-dependent creep compliance that is used in the analytical equation for predicting the BBR beam deflection over time. Test-analysis results demonstrate that the DSR low temperature testing and its mechanistic conversion is promising as it can predict the BBR beam deflection, while a calibration factor can improve the predicting power of creep stiffness, and an additional horizontal shifting was helpful to give a better agreement of the slope (m-value). Although actual implementation into practice requires a more careful investigation, this study infers that the DSR testing can be a good supplemental (or alternative) method to the BBR, which can benefit experimental efficiency of many state highway agencies.
molecular dynamics modeling and simulation of Bituminous Binder chemical aging due to variation of oxidation level and saturate aromatic resin asphaltene fractionFuel, 2019Co-Authors: Farshad Fallah, Yongrak Kim, Santosh Reddy Kommidi, Fardi Khabaz, H F HaghshenasAbstract:
Abstract Bituminous Binder’s chemical aging process leads to significant changes in its mechanical and rheological properties. The two main outcomes of chemical aging are the oxidation of molecules and changes in the Binder’s saturate-aromatic-resin-asphaltene (SARA) fractions. The Binder components’ reaction to oxygen results in the formation of polar viscosity-building molecules, while changes in the SARA fractions disturbs the Binder’s balance, giving it brittle properties. As both of these factors affect the Binder at the molecular level, molecular dynamics (MD) simulations can improve the fundamental understanding of Binder aging. Therefore, nine MD models were built (one model that represents unaged Binder and eight different aged Binder models) in this study for two specific purposes: to compare the MD simulation results with the experimental results and to conduct a parametric analysis of the MD simulations to investigate the effect of each aging outcome on the properties of the Binder. A comparison among Binders with different aging levels showed that the MD simulations and experiments had the same rank order in viscosity values, but they had significantly different magnitudes, which may be partly attributed to the high shear rates used in the MD simulation. The parametric analysis indicated that the dominant aging mechanism in the laboratory aged Binder was the disturbance of the SARA fractions, while the oxidation of the molecules appears to be a more dominant mechanism in the field aged Binder.
Dariusz Sybilski – One of the best experts on this subject based on the ideXlab platform.
zero shear viscosity of Bituminous Binder and its relation to Bituminous mixture s rutting resistanceTransportation Research Record, 1996Co-Authors: Dariusz SybilskiAbstract:
When testing viscosity of polymer-bitumen systems a question arises about interpretation of results as those systems behave as non-Newtonian liquids. A simple equation modeling non-Newtonian behavior of polymer-bitumens was proposed (which is a simplified version of the CROSS model). The equation used enables the calculation of zero-shear viscosity η0 from viscosity measurements conducted under various shear conditions, that is, with rotational viscometer at different shear rates (stresses). Test results are presented of several polymer-modified Bituminous Binders before and after Thin film oven test aging and discussion of non-Newtonian behavior. The wheel tracking test (Laboratoric Central des Ponts et Chaussees) was conducted for asphalt concrete with several Bituminous Binders, either plain bitumens or polymer modified. To estimate Bituminous mixture’s rutting resistance, a new relationship has been proposed to calculate N10 (wheel passes number to rut depth 10 mm). Close correlation was found between…