scholarly journals Effects of Short-Term Ageing Temperature on Conventional and High-Temperature Properties of Paving-Grade Bitumen with Anti-Stripping and WMA Additives

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6229
Author(s):  
Krzysztof Maciejewski ◽  
Piotr Ramiączek ◽  
Eva Remisova
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
Critical Temperature ◽  
Production Process ◽  
Dynamic Viscosity ◽  
Softening Point ◽  
Creep Compliance ◽  
Asphalt Binders ◽  
Short Term ◽  
Bituminous Binders

The presented study explores the effects of decreased temperatures utilized in rolling thin-film oven (RTFOT) laboratory short-term ageing of asphalt binders based on 35/50- and 50/70-penetration paving-grade bitumen. Additionally, the effects of three additives used with these binders at different concentrations are evaluated: liquid anti-stripping agent, liquid warm-mix additive, and solid warm-mix additive. The resulting asphalt binders were subjected to basic (penetration at 25 °C, softening point, dynamic viscosity) and functional high-temperature characterization (G*/sin(δ), high critical temperature, non-recoverable creep compliance). It was found that the decreased short-term ageing temperatures may detrimentally impact the high-temperature grade of bituminous binders, but this effect can be mitigated by the use of appropriate additives. What is more, it was found that bituminous binders may respond differently to the aforementioned factors. Based on the results, it is advised that asphalt binders intended for use in warm-mix asphalts should be thoroughly tested to appropriately simulate the mixture production process and its effects.

Influence of Rubber Powder Content on High-Temperature Performance of TOR Rubber Asphalt

2013 ◽  
Vol 405-408 ◽  
pp. 1753-1756
Author(s):  
Yong Mei Guo ◽  
Wei Chen
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
Dynamic Viscosity ◽  
Softening Point ◽  
Asphalt Binders ◽  
Rheological Parameters ◽  
Dynamic Shear ◽  
Rubber Powder ◽  
Temperature Performance ◽  
Powder Content

Six kinds of TOR rubber asphalts with 5%-30% rubber powder contents of were selected to carry out conventional high-temperature tests and dynamic shear rheological tests to obtain some parameters reflecting the high-temperature performance of asphalt binders, such as softening point, dynamic viscosity at 60°C, rutting factor (G*/sinδ) at 60°C and critical temperature of rutting factor (TG*/sinδ). The results show that the changing tendency of two rheological parameters of TOR rubber asphalts, G*/sinδ at 60°C and TG*/sinδ, is ascend in first and descend at last with the increase of rubber powder content proportion. The high-temperature performance of TOR rubber asphalt with the rubber powder content about 20% is the best. Softening point and dynamic viscosity at 60°C, as two conventional high-temperature parameters of asphalt binders, can describe the high-temperature performance of TOR rubber asphalt with the rubber powder content below 20%, but cannot evaluate accurately the high-temperature performance of TOR rubber asphalt with the rubber powder content above 20%, because TOR rubber asphalt has formed a network structure at this moment.

scholarly journals Effects of WMA Additive on the Rheological Properties of Asphalt Binder and High Temperature Performance Grade

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Jiupeng Zhang ◽  
Guoqiang Liu ◽  
Li Xu ◽  
Jianzhong Pei
Keyword(s):  
Critical Temperature ◽  
Rheological Properties ◽  
Asphalt Binder ◽  
Aging Effect ◽  
Asphalt Binders ◽  
Short Term ◽  
Performance Grade ◽  
Temperature Performance ◽  
Effects Of Temperature ◽  
Increasing Temperature

Sasobit additives with different dosages were added into 70# and 90# virgin asphalt binders to prepare WMA binders. The rheological properties, includingG∗andδ, were measured by using DSR at the temperature ranging from 46°C to 70°C, and the effects of temperature, additive dosage and aging onG∗/sin⁡δ, critical temperature, and H-T PG were investigated. The results indicate that WMA additive improvesG∗but reducesδ, and the improvement on 70# virgin binder is more significant.G∗/sin⁡δexponentially decreases with the increasing temperature but linearly increases with the increasing additive dosage. Aging effect weakens the interaction between binder and additive but significantly increases the binder’s viscosity; that is whyG∗/sin⁡δis higher after short-term aging. In addition, the critical temperature increases with the increasing additive dosage, and the additive dosage should be more than 3% and 5% to improve H-T PG by one grade for 70# and 90# virgin binder, respectively.

Effect of Waste Edible Animal Oil on Physical Properties of Aged Asphalt

2014 ◽  
Vol 599 ◽  
pp. 130-134 ◽  
Author(s):  
Yang Sang ◽  
Mei Zhu Chen ◽  
Jin Wen ◽  
Bin Bin Leng ◽  
Shao Peng Wu
Keyword(s):  
Thin Film ◽  
Physical Properties ◽  
Softening Point ◽  
Asphalt Binders ◽  
Oven Test ◽  
Modified Asphalt ◽  
Aged Asphalt ◽  
Sbs Modified Asphalt

In order to explore the feasibility of waste edible animal oil used as the asphalt rejuvenator, this study investigated the effect of waste edible animal oil on softening point, penetration, ductility and viscosity of aged asphalt binders. The aged asphalt binders were obtained from the indoor simulating aging processes by using Thin Film Oven Test (TFOT) and Pressure Aging Vessel (PAV). The results show that the dosage of waste animal oil has different effect on physical properties of aged asphalt. Both 70# asphalt and SBS modified asphalt have the optimal content of waste edible animal oil to achieve the best physical properties. The optimal contents of waste edible animal oil for 70# asphalt and SBS modified asphalt are 6% and 4%, respectively.

The Effect of Short-Term Aging on Rheological Properties of Asphalts

2011 ◽  
Vol 255-260 ◽  
pp. 3321-3325
Author(s):  
Li Xing Ma ◽  
Jun Feng Huang ◽  
Zhi Da Li
Keyword(s):  
Rheological Properties ◽  
Softening Point ◽  
Dynamic Testing ◽  
Complex Modulus ◽  
Viscoelastic Behavior ◽  
Asphalt Binders ◽  
Rheological Characteristics ◽  
Short Term ◽  
Conventional Tests ◽  
Temperature Susceptibility

The effect of short-term aging on rheological properties of asphalts was studied. In this paper, asphalt was aged by rolling thin film oven, which was carried out for 300 minutes and were analyzed at an interval of 75 minutes. The paper gives a description of the most commonly used conventional tests, such as Penetration and Softening Point, and a more detailed description of the viscoelastic behavior and dynamic testing of asphalts by way of Brookfield viscometer and Dynamic Shear Rheometer (DSR). It is found that there are a decrease in penetration and an increase in softening point with aging. The viscosity of aged asphalts was observed to increase with time. The DSR results show that short-term aging significantly increases the complex modulus at low temperature, but complex modulus at high temperature was just lightly affected. The four tests results were also incorporated to evaluate the temperature susceptibility and the rheological characteristics of asphalt binders.

Modelling short-term aging of asphalt binders using the rolling thin film oven test

2002 ◽  
Vol 29 (1) ◽  
pp. 135-144 ◽  
Author(s):  
Ahmed Shalaby
Keyword(s):  
Thin Film ◽  
Shear Modulus ◽  
Phase Angle ◽  
Asphalt Binder ◽  
Temperature Shift ◽  
Test Methods ◽  
Asphalt Binders ◽  
Aging Effects ◽  
Short Term ◽  
Oven Test

Simulation of short-term aging of asphalt binders is a widely used procedure in asphalt binder characterization for predicting the binder response to plant mixing and paving under controlled laboratory conditions. There are two laboratory test methods for evaluating the short-term aging of asphalt binders: (i) a method using rotating pans filled with a thin asphalt film termed thin film oven test (TFOT) and (ii) a method using rolling cylindrical asphalt containers termed rolling thin film oven test (RTFOT). In this paper, an attempt is made to develop generalized models for short-term aging effects using the RTFOT aging time as a benchmark. Six binder types representing two PG grades and three source suppliers are conditioned to varying levels of RTFOT aging and tested using the dynamic shear rheometer (DSR). Aging effects are modelled using independent temperature shift models for the shear modulus and phase angle. The paper discusses the sources of errors in producing generalized models and some potential applications of aging models. The research revealed that it is possible to develop and implement such models for unmodified binders.Key words: asphalt, aging, RTFOT, DSR, binder rheology, shear modulus, phase angle.

scholarly journals Changes in Nanoscaled Mechanical and Rheological Properties of Asphalt Binders Caused by Aging

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Ben Liu ◽  
Junan Shen ◽  
Xuyan Song
Keyword(s):  
Thin Film ◽  
Atomic Force Microscope ◽  
Rheological Properties ◽  
Asphalt Binder ◽  
Adhesive Force ◽  
Asphalt Binders ◽  
Dynamic Shear ◽  
Short Term ◽  
Atomic Force ◽  
Aged Asphalt

Aging of an asphalt binder causes the changes in the microstructure and, consequently, in the nanomechanical and rheological properties of the aged asphalt binder. Short-term aging on asphalt binders was simulated using rotating thin film oven (RTFO). These changes in the microstructure and nanomechanical and rheological properties were measured using atomic force microscope (AFM) and dynamic shear rheometer (DSR). The results indicated that (1) the adhesive force of the asphalt binder from AFM tests was increased after RTFO aging; (2)G*of the asphalt binder from DSR tests increased after RTFO aging; (3) the results from AFM were consistent with those from DSR, explaining the mechanism of the changes of rheological properties.

Study on Influence of Snowmelt Agent to Performances of Asphalt

2014 ◽  
Vol 960-961 ◽  
pp. 78-81
Author(s):  
Jin Yang ◽  
Li Xia Liu ◽  
Peng Fei Xiao
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Dynamic Viscosity ◽  
Softening Point ◽  
Penetration Ratio

To study the influences of snowmelt agent to performances of asphalt,three snowmelt agents of NaCl,CaC12,CH3COONa·3H2O were used to make asphalt sample and experiments about performances of high temperature and low temperature of asphalt were done.The results indicated that: temperature sensibility of 90# asphalt was reduced, softening point was increased ,dynamic viscosity was increased and ductility was reduced after being dealedwith snowmelt agent; Residual penetration ratio and residual ductility were also reduced after being dealedwith snowmelt agent.

Laboratory Aging and Annealing of Asphalt Binders by Microwave Radiation

1996 ◽  
Vol 1535 (1) ◽  
pp. 98-107 ◽  
Author(s):  
S. W. Bishara ◽  
R. L. McReynolds
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
Molecular Size ◽  
Petri Dish ◽  
Microwave Treatment ◽  
Intermediate Temperature ◽  
Size Exclusion ◽  
Asphalt Binders ◽  
Average Difference

A household microwave oven with a frequency of 2.45 × 103 ±13 MHz and an output power of 1000 W is used to simulate short- and long-term aging of asphalt, and for annealing, prior to sampling, to remove steric (isothermal) hardening. A quartz petri dish holds the asphalt during microwave treatment, at atmospheric pressure. To simulate thin film oven (TFO) aging, a 10-g sample is microwaved for a total of 33 min. For 11 asphalts, the average difference in G*/sin δ, at limiting high temperature, between TFO and microwave aging is ±0.68 kPa. Simulating rolling thin-film oven (RTFO) aging is possible by microwaving for a total of 63 min. For 18 asphalts, the average difference in G*/sin δ, at limiting high temperature, between RTFO and microwave aging is ± 1.19 kPa. Aging by RTFO + pressure aging vessel (PAV) and TFO + PAV is simulated by microwaving for a total of 158 min. Microwave aging marginally underestimates long-term aging. For 18 asphalts, the average difference in intermediate temperature obtained after RTFO + PAV versus microwave aging is −2.8°C; for TFO + PAV versus microwave aging, the average difference is −2.7°C. Annealing for 2 hr at 150°C in a convection oven (conductive heating) is simulated by microwaving for a total of 27 min. The average difference in G*/sin δ between the two methods is ±0.24 kPa. Molecular size index (MSI, the ratio of first to second fraction from size exclusion chromatography) correlates with stiffness at low temperature. At intermediate temperature, tan δ remains practically unchanged until MSI reaches a minimum, then increases sharply. At limiting high temperature, G* does not correlate with MSI.

ALLEGHENY STAINLESS TYPE 405

Alloy Digest ◽  
1985 ◽  
Vol 34 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Critical Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Ductile Material ◽  
Air Cooling ◽  
Temperature Performance

Abstract ALLEGHENY STAINLESS Type 405, unlike most other 12% chromium steels, is not subject to appreciable hardening through air cooling from high temperatures. This is an advantageous characteristic in those applications where a soft, ductile material is required after rapid cooling from above the critical temperature. The nonhardening tendency of Type 405 also retards the formation of hardening cracks where welding is employed. Its uses include annealing boxes and baffles where hardening during cooling would be undesirable. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as heat treating and machining. Filing Code: SS-461. Producer or source: Allegheny Ludlum Corporation.

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