Investigation the effect of short term aging on thermodynamic parameters and thermal cracking of asphalt mixtures modified with nanomaterials
TL;DR: In this paper, the authors describe the most common distresses in asphalt pavements, occurring in cold regions and exerting a detrimental effect on the quality and life of the pavement.
Abstract: Thermal or low temperature cracking is among the most common distresses in asphalt pavements, occurring in cold regions and exerting a detrimental effect on the quality and life of the pavement. Ha...
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TL;DR: In this paper, a molecular model of rejuvenators for aged asphalt-binders was constructed using molecular dynamic simulations, and the diffusion coefficients of the rejuvenator, aged asphalt binder, and four components of the aged asphaltbinder were calculated.
20 citations
TL;DR: For the three PACs, the results showed that the Marshall stability, water stability, and low-temperature crack resistance of CM-PAC are all the best Furthermore, CM- PAC has better rutting resistance than two single modified PACs, based on creep test results.
Abstract: This paper studies the mechanical properties of porous asphalt concrete with styrene-butadiene-styrene (SBS) polymer modified bitumen as the binder, steel slag as the aggregate and crumb rubber and basalt fiber as modifiers. First, the appearance, mechanics, chemical composition and high-temperature stability of steel slag were studied by some equipment. Then, three kinds of porous asphalt concrete with SBS polymer modified bitumen as binder were produced, Namely, crumb rubber modified porous asphalt concrete (CR-PAC), basalt fiber modified porous asphalt concrete (BF-PAC), and basalt fiber and crumb rubber composite modified asphalt concrete (CM-PAC). Finally, the properties of the three kinds of modified PACs were studied through the Marshall test, freeze-thaw splitting test, low-temperature splitting test, permeability test, and creep test. The results showed that the crush value and abrasion value of steel slag are 15.1% and 13.5%, respectively; it has excellent strength and abrasion. In addition, the steel slag shows a porous structure and it provides an interface basis for a better bond with bitumen. For the three PACs, the results showed that the Marshall stability, water stability, and low-temperature crack resistance of CM-PAC are all the best Furthermore, CM-PAC has better rutting resistance than two single modified PACs, based on creep test results. The CM-PAC in this study can be used as a new type of pavement material.
11 citations
TL;DR: In this paper, the benefits, limitations, and factors that contribute to successful applications of CMA, along with the future scope of research to expand CMA applications, are reviewed.
11 citations
TL;DR: In this paper, the authors applied a scalable process for laboratory production of Cellulose Nanofibers (CNF) and evaluated feasibility of using the produced CNF as a sustainable plant-based asphalt additive to improve the mechanical properties and durability of asphalt pavements.
6 citations
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TL;DR: The concept of van der surface thermodynamics of (Lewis) Waals was first proposed by as discussed by the authors to account for certain properties of acid-base (AB) Interactions nonideal gases and liquids.
Abstract: The concept of a general attractive interaction between neutral atoms was first proposed by van der Surface Thermodynamics of (Lewis) Waals in 1873, to account for certain properties of Acid-Base (AB) Interactions nonideal gases and liquids.’ Three different but nevThe Young-Dupr6 Equation 933 ertheless related phenomena were subsequently shown to contribute to these “van der Waals” interactions: (1) randomly orienting dipole-dipole (or orientation) inPositive and Negative Interfacial
2,210 citations
"Investigation the effect of short t..." refers background in this paper
...These components include A) non polar component or Lifshitz-van der Waals (LW) component, B) Lewis acid component, and C) Lewis base component (Van Oss et al., 1988)....
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01 Jan 1993
TL;DR: In this paper, the SHRP-LTPP results on the design equations would be evolutionary in nature and will be evident over the next ten to fifteen years, which could result from the General Pavement Studies (GPS) data.
Abstract: At this juncture of the SHRP-LTPP program, it is appropriate to discuss the potential impacts that SHRP-LTPP results could have on the future AASHTO Guides for the Design of Pavement Structures. In this regard specific topical areas of the guide are outlined in this presentation which could undergo change as a result of the SHRP-LTPP program. Particular attention is given to expected changes in the guide which could result from the General Pavement Studies (GPS) data. The areas of the guide expected to be impacted by SHRP-LTPP include the design equations, serviceability measurements, materials characterization, and rehabilitation. The impact of the SHRP-LTPP results on the design equations would be evolutionary in nature and will be evident over the next ten to fifteen years.
409 citations
TL;DR: In this paper, a repeatable semi circular bending (SCB) fracture test was presented to evaluate the low temperature fracture resistance of asphalt mixture, which represented a combination of factors such as binder type, binder modifier, aggregate type, and air voids, and two testing conditions of loading rate and initial notch length.
Abstract: This work presents a repeatable semi circular bending (SCB) fracture test to evaluate the low temperature fracture resistance of asphalt mixture. The fracture resistance of six asphalt mixtures, which represent a combination of factors such as binder type, binder modifier, aggregate type, and air voids, and two testing conditions of loading rate and initial notch length, was evaluated by performing SCB fracture tests at three low temperatures. Fracture energy was calculated from the experimental data. Experimental results indicated strong dependence of the low temperature fracture resistance on the test temperature. Experimental plots and low coefficient of variation (COV) values from three replicates show a satisfactory repeatability from the test. The results of the analysis showed that fracture resistance of asphalt mixtures is significantly affected by type of aggregate and air void content. Experimental results also confirmed the significance of binder grade and modifier type with relation to cracking resistance of asphalt mixtures. Analysis of result also indicated that both the loading rate and initial notch length had significant effect on the fracture energy at the highest test temperature, whereas the effect was strongly diluted at the two lower temperatures. No clear trend was found with the fracture peak load from either the effect of loading rate or notch length.
237 citations
TL;DR: In this article, a single-edge notched beam (SE(B)) test specimen was used to determine the fracture energy of asphalt concrete overlays and the results from the tests follow expected trends and test variability appears to be within a range typical for asphalt concrete fracture testing.
Abstract: This paper describes the development of a fracture test for determining the fracture energy of asphalt concrete. The test will be used in combination with numerical analysis and field studies to obtain a better understanding of the mechanisms of reflective cracking in asphalt concrete overlays. A review of the literature revealed that a single-edge notched beam (SE(B)) test specimen was the most promising fracture test for the objectives of the reflective cracking study. Existing servohydraulic testing equipment was modified to perform the SE(B) test along with new loading fixtures, sensors, data collection, and analysis procedures. Preliminary tests were conducted to develop test procedures, to obtain a better understanding of crack-front characteristics, to investigate test repeatability, to examine variations of fracture energy with temperature, and to investigate mixed-mode fracture. The results from the tests follow expected trends and test variability appears to be within a range typical for asphalt concrete fracture testing.
181 citations
"Investigation the effect of short t..." refers methods in this paper
..., 2005), the SCB test under three point bending load (Li &Marasteanu, 2010), the disk shaped compact tension test (DCT) (Wagoner et al., 2005), and the indirect tensile test (IDT) (Sangpetgnam et al....
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...Several experimental methods have been suggested in order to study cracks in asphalt mixtures, including the single edge notched beam test under three or four point bending load (SENB) (Wagoner et al., 2005), the SCB test under three point bending load (Li &Marasteanu, 2010), the disk shaped compact tension test (DCT) (Wagoner et al., 2005), and the indirect tensile test (IDT) (Sangpetgnam et al., 2003)....
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...…suggested in order to study cracks in asphalt mixtures, including the single edge notched beam test under three or four point bending load (SENB) (Wagoner et al., 2005), the SCB test under three point bending load (Li &Marasteanu, 2010), the disk shaped compact tension test (DCT) (Wagoner et…...
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...…single edge notched beam test under three or four point bending load (SENB) (Wagoner et al., 2005), the SCB test under three point bending load (Li &Marasteanu, 2010), the disk shaped compact tension test (DCT) (Wagoner et al., 2005), and the indirect tensile test (IDT) (Sangpetgnam et al., 2003)....
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...Several experimental methods have been suggested in order to study cracks in asphalt mixtures, including the single edge notched beam test under three or four point bending load (SENB) (Wagoner et al., 2005), the SCB test under three point bending load (Li &Marasteanu, 2010), the disk shaped compact tension test (DCT) (Wagoner et al....
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TL;DR: In this article, two types of semi-circular bend (SCB) specimens containing an edge vertical crack are used and subjected to asymmetric three-point bending load to measure the critical load needed for calculation of HMA fracture resistance.
159 citations
"Investigation the effect of short t..." refers background in this paper
...It is also easy to make an edge notch in this sample and load it (Ameri et al., 2012)....
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