Aging effects on recycled WMA porous asphalt mixtures

Frigio, F.; Raschia, Simone; Steiner, Daniel; Hofko, Bernhard; Canestrari, Francesco

doi:10.1016/j.conbuildmat.2016.07.063

Cited by 44 publications

(16 citation statements)

References 21 publications

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“…ey found that warm-mix asphalt technology lowers the construction temperature and reduces the elastic modulus of the mixture, with no influence on the fatigue performance of mixture after long-term aging [22]. However, at present, there are few studies on the rheological properties of the high-viscosity asphalt with a surfactant warm mixing agent.…”

Section: Introductionmentioning

confidence: 99%

Effects of Surfactant Warm‐Mix Additives on the Rheological Properties of High‐Viscosity Asphalt

Jian

Fan

Lin

et al. 2020

Advances in Materials Science and Engineering

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In order to evaluate the possibility of the application of warm mixing technology in high-viscosity asphalt mixture, in this paper, the effects of surfactant warm-mix additives (WMAs) on physical and rheological properties of high-viscosity asphalt (HVA) which was prepared with self-developed SBS/C9 petroleum resin blends (SPR) modifier were measured. The results indicate that the addition of WMA can decrease the viscosity and softening point but improve the penetration and ductility of warm-mix HVA. With the increase of the content of WMA, the modulus, failure temperature, viscosity, and recovery rate of warm-mix HVA all increased at first and then decreased, and the maximum value appeared when the modifier content was 1.0%–1.5%. Moreover, when the amount of WMA is 1.5%, the low-temperature performance of warm-mix HVA reaches the best value. Thus, the amount of WMA is of great importance for the warm-mix HVA, and in order to achieve ideal rheological properties, the recommended amount of WMA is 1.0%–1.5%. Considering economic improvement and environmental protection, WMA could be an alternative for increasing the workability of HVA.

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Section: Introductionmentioning

confidence: 99%

Effects of Surfactant Warm‐Mix Additives on the Rheological Properties of High‐Viscosity Asphalt

Jian

Fan

Lin

et al. 2020

Advances in Materials Science and Engineering

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“…In recent years, researchers have used different types of additives to improve the performance of the asphalt mixture. Scientists and engineers are permanently trying to improve properties of asphalt mixtures, such as their stability and durability, by incorporating new additives either in the bitumen or in the asphalt mixture [2,3]. The addition of polymers is a common method applied to modify the binder, although different types of fibers have been evaluated [4].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Moisture Susceptibility for Asphalt Mixtures Modified by Carbon Fibers

Mawat

Ismael

2020

Civ Eng J

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Moisture induced damage in asphaltic pavement might be considered as a serious defect that contributed to growth other distresses such as permanent deformation and fatigue cracking. This paper work aimed through an experimental effort to assess the behaviour of asphaltic mixtures that fabricated by incorporating several dosages of carbon fiber in regard to the resistance potential of harmful effect of moisture in pavement. Laboratory tests were performed on specimens containing fiber with different lengths and contents. These tests are: Marshall Test, the indirect tensile test and the index of retained strength. The optimum asphalt contents were determined based on the Marshall method. The preparation of asphaltic mixtures involved three contents of carbon fiber namely (0.10%, 0.20%, and 0.30%) by weight of asphalt mixture and three lengths including (1.0, 2.0 and 3.0) cm. The results of this work lead to several conclusions that mainly refer to the benefits of the contribution of carbon fibers to improving the performance of asphalt mixtures, such as an increase in its stability and a decrease in the flow value as well as an increase in voids in the mixture. The addition of 2.0 cm length carbon fibers with 0.30 percent increased indirect tensile strength ratio by 11.23 percent and the index of retained strength by 12.52 percent. It is also found that 0.30 % by weight of the mixture is the optimum fiber content for the three lengths.

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“…The setup and equipment which was used for the conditioning procedure for BINDER I is based on the VAPro -Viennese Aging Procedure (Frigio, Raschia, Steiner, Hofko, & Canestrari, 2016;. HMA specimens are assembled within a triaxial cell between filter stones and are covered by an elastic membrane.…”

Section: Development and Modifications Of The N-vapro Methodsmentioning

confidence: 99%

Introducing a nitrogen conditioning to separate oxidative from non-oxidative ageing effects of hot mix asphalt

Steiner

Hofko

Blab

2018

Road Materials and Pavement Design

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Bitumen used as a binder is subjected to ageing that leads to increased stiffness and brittleness. For the simulation of long-term ageing of hot mix asphalt (HMA), most methods are based on conditioning at high temperatures to increase oxidation. This paper investigates the impact of non-oxidative / thermal and oxidative effects on long-term ageing of asphalt mix specimens in the laboratory and aims at separating these effects. Therefore, specimens are placed in a heating cabinet at different temperatures ranging from + 60°C to + 160°C. One part of the specimens is exposed to the air atmosphere, while the other part is stored under nitrogen atmosphere (N-VAPro). Thereby, oxidative ageing is avoided for the nitrogen-stored specimens and the combination of thermal effects can be separated from oxidative effects. The changes in the material behaviour of HMA as a result of the different ageing regimes are investigated by stiffness tests at intermediate temperatures. Furthermore, Dynamic Shear Rheometer (DSR) tests are carried out on virgin, aged binder (RTFOT, RTFOT + PAV) as well as on recovered bitumen of both conditioning groups. The results indicate that conditioning temperatures must be kept below 110°C to prevent the asphalt mixtures from non-oxidative ageing effects. However, atmospheric air conditioning for HMA specimens is only suitable as a long-term ageing procedure for temperatures above 110°C to increase the oxidation rate to an efficient rate. This threshold temperature can also be seen as the limit value for lab-ageing procedures that should not be exceeded to avoid non-oxidative ageing effects that cannot occur in the field due to limited maximum temperatures. Furthermore, a double exponential increase with the ageing temperature on the binder level was shown.

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Aging effects on recycled WMA porous asphalt mixtures

Cited by 44 publications

References 21 publications

Effects of Surfactant Warm‐Mix Additives on the Rheological Properties of High‐Viscosity Asphalt

Effects of Surfactant Warm‐Mix Additives on the Rheological Properties of High‐Viscosity Asphalt

Assessment of Moisture Susceptibility for Asphalt Mixtures Modified by Carbon Fibers

Introducing a nitrogen conditioning to separate oxidative from non-oxidative ageing effects of hot mix asphalt

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