Influence of Fine Aggregate Content on Low-Temperature Cracking of Asphalt Pavements

2016 ◽  
Vol 45 (3) ◽  
pp. 20150240 ◽  
Author(s):  
H. Ma ◽  
C. Zhou ◽  
D. Feng ◽  
L. Sun
Keyword(s):  
Low Temperature ◽  
Asphalt Pavements ◽  
Fine Aggregate ◽  
Aggregate Content ◽  
Low Temperature Cracking

Behaviour of recycled asphalt pavements at low temperatures

1991 ◽  
Vol 18 (3) ◽  
pp. 428-435 ◽  
Author(s):  
M. Sargious ◽  
N. Mushule
Keyword(s):  
Finite Element ◽  
Low Temperature ◽  
Thermal Stresses ◽  
Asphalt Pavements ◽  
Recycled Asphalt ◽  
Expected Performance ◽  
Different Types ◽  
Low Temperature Cracking ◽  
Proper Comparison ◽  
Better Than

This paper summarizes the results of a study conducted to evaluate the behaviour of recycled asphalt pavements with respect to low-temperature cracking. For this purpose, a recycled mix consisting of 45.2% reclaimed materials and 54.8% virgin materials as well as a virgin control mix were used in the research program. In the design of both mixes, their initial properties were kept as close as possible to each other to allow for a proper comparison between recycled and virgin asphalt pavements. Using mix properties that were determined experimentally in the laboratory, thermal stresses resulted from drop in temperature and the expected cracking temperatures were determined for both mixes. An experimental analysis based on laboratory tests that consider the pavement properties only as well as a more complete theoretical analysis based on a finite element computer program known as FETAB were included in this study. The program incorporates subgrade parameters, as well as pavement properties and thickness. Using these variables as inputs to the program, the expected performance of recycled and virgin asphalt pavements of various thicknesses and resting on different types of subgrade, with respect to low-temperature cracking, was studied. The results of the study indicated that recycled asphalt pavements would perform better than virgin asphalt pavements of similar initial properties. Key words: asphalt, finite element, low-temperature cracking, reclaimed, recycled, thermal stresses.

Evaluation of Carbon Nanotubes Asphalt Modification Using the Superpave Criteria

2021 ◽  
Vol 902 ◽  
pp. 135-143
Author(s):  
Mohammad Ali Khasawneh ◽  
Khalid Ghuzlan ◽  
Nada Bani Melhem
Keyword(s):  
Carbon Nanotubes ◽  
Low Temperature ◽  
Rheological Properties ◽  
Asphalt Binder ◽  
Fatigue Cracking ◽  
Asphalt Binders ◽  
Asphalt Pavements ◽  
Low Temperature Cracking ◽  
Asphalt Modification ◽  
Rotational Viscosity

Rutting, fatigue cracking and low temperature cracking are the most important distresses in asphalt pavements as a result of changes in rheological properties of asphalt binder. Many types of modifiers were used to enhance asphalt behavior at both low and high temperatures. In this study, carbon nanotubes (CNT) were used as one of many nanomaterials that take a large attention in the latest research related to asphalt modification against different types of distresses. Effect of CNT on rheological properties of asphalt binder was investigated by testing unmodified and CNT modified asphalt binders using two of Superpave devices: Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR). Penetration, softening point, flash point and rotational viscosity (RV) tests were carried out as well. CNT was added in 0.1%, 0.5% and 1% by weight of asphalt binder. It was found that adding CNT in 0.5% and 1% increase stiffness of asphalt and consequently asphalt pavement rutting resistance. On the other hand, this increase in stiffness affected pavement behavior adversely which is not desirable for fatigue and low temperature cracking. However, Superpave specifications were still satisfied and asphalt binder’s relaxation properties were improved upon CNT modification. It was eventually found that 0.5% of CNT is the optimum percentage for the best performance.

Low Temperature Cracking Evaluation of Asphalt Rubber Mixtures Using Semi-Circular Bending Test

2011 ◽  
Vol 243-249 ◽  
pp. 4201-4206 ◽  
Author(s):  
Jing Hui Liu
Keyword(s):  
Low Temperature ◽  
Asphalt Concrete ◽  
Asphalt Mixtures ◽  
Bending Test ◽  
Asphalt Pavements ◽  
Dry Process ◽  
Wet Process ◽  
Asphalt Rubber ◽  
Scb Test ◽  
Low Temperature Cracking

Low temperature cracking is the main distress in asphalt pavements in winter. As asphalt rubber course is increasing, there is no standard method to characterize the resistance to cracking of asphalt rubber mixtures. This paper investigates the use of a Semi Circular Bend (SCB) test as a candidate for a low-temperature cracking specification. Based on the SCB test, this paper presents the findings of a laboratory study that aimed to evaluate the effects of recycled tire rubber on the Low temperature cracking properties of asphalt mixtures. Three mix types, a conventional hot-mix asphalt concrete, a dry process rubber modified asphalt concrete, and a wet process asphalt-rubber asphalt concrete, were included in the investigation. It is found that the asphalt mixtures produced by the wet process showed much better low temperature crack resistance, the binder effect modified by rubber was significant.

Active Mitigation of Low-Temperature Cracking in Asphalt Pavements

2021 ◽  
pp. 183-189
Author(s):  
Quentin Adam ◽  
Gerald Englmair ◽  
Eyal Levenberg ◽  
Asmus Skar
Keyword(s):  
Low Temperature ◽  
Asphalt Pavements ◽  
Low Temperature Cracking

Comparisons of analytical and approximate interconversion methods for thermal stress computation

2015 ◽  
Vol 42 (10) ◽  
pp. 705-719 ◽  
Author(s):  
Augusto Cannone Falchetto ◽  
Ki Hoon Moon
Keyword(s):  
Thermal Stress ◽  
Low Temperature ◽  
Asphalt Binder ◽  
Lower Boundary ◽  
Relaxation Modulus ◽  
Asphalt Pavements ◽  
Approximate Methods ◽  
Low Temperature Cracking ◽  
Stress Computation ◽  
Boundary Limits

In the northern US and Canada, low temperature cracking represents a significant distress for asphalt pavements. As temperature drops thermal stress develops in the restrained asphalt surface layer and when it reaches a critical value cracking occurs. For this reason, thermal stress is a crucial parameter for evaluating the low temperature pavement performance. Conventionally, thermal stress is computed by converting creep compliance into its corresponding relaxation modulus based on different techniques. In this paper, five analytical and approximate interconversion methods are used to obtain the asphalt binder thermal stress and the results are graphically and statistically compared. Clear differences in thermal stress are found when using power law based interrelationships in comparison with the numerical solution of the convolution integral according to Hopkins and Hamming’s algorithm. Nevertheless, the approximate methods provide a simpler approach for determining satisfactory upper and lower boundary limits when estimating the thermal stress of asphalt binder.

scholarly journals The Stress Relaxation Of Modified Bitumens

2015 ◽  
Vol 16 (1) ◽  
pp. 66-81 ◽  
Author(s):  
Pavel Coufalík ◽  
Ondřej Dašek ◽  
Jiří Kachtík ◽  
Jan Kudrna ◽  
Svatopluk Stoklásek
Keyword(s):  
Shear Stress ◽  
Stress Relaxation ◽  
Low Temperature ◽  
Low Temperatures ◽  
Crumb Rubber ◽  
Asphalt Pavements ◽  
Quick Method ◽  
Modification System ◽  
Low Temperature Cracking ◽  
Temperature Susceptibility

Abstract The Asphalt pavements in Central and Eastern Europe have to be resistant to high and very low temperatures and climatic changes. Especially emphasize influence of low temperatures seems to be critical parameter. That is why the modified bitumens with low temperature susceptibility and with high resistance to low temperature cracking are searched for. Dynamic Shear Rheometer (DSR) can be used as a quick method that can evaluate the modification system of bituminous binders. The advantage of DSR testing is also related to possibility of comparison of unaged and aged bitumen. The relaxations of shear stress of several asphalt rubber binders (containing 11 %, 13 %, 15 % and 17 % of crumb rubber) and paving bitumen were determined in DSR at the temperature of 0 °C and −10 °C. Relaxation tests were performed in the controlled strain regime. Total shear strain (rotation of upper geometry) was set to 1 % of the sample thickness and stress was applied for 60 s. Relaxation time was set to a period of 15 minutes. The shear stress relaxation behaviour of unaged bitumens and bitumens aged after 75 minutes and 225 minutes in Rolling Thin Film Oven Test (RTFOT) is presented and discussed.

IlliTC – low-temperature cracking model for asphalt pavements

2013 ◽  
Vol 14 (sup2) ◽  
pp. 57-78 ◽  
Author(s):  
Eshan V. Dave ◽  
William G. Buttlar ◽  
Sofie E. Leon ◽  
Behzad Behnia ◽  
Glaucio H. Paulino
Keyword(s):  
Low Temperature ◽  
Asphalt Pavements ◽  
Low Temperature Cracking

scholarly journals Methods and criteria for evaluation of asphalt mixture resistance to low temperature cracking

2017 ◽  
Vol 12 (2) ◽  
pp. 135-144 ◽  
Author(s):  
Judita Gražulytė ◽  
Audrius Vaitkus ◽  
Vitalijus Andrejevas ◽  
Gediminas Gribulis
Keyword(s):  
Acoustic Emission ◽  
Spectral Analysis ◽  
Thermal Stress ◽  
Low Temperature ◽  
Low Temperatures ◽  
Asphalt Mixture ◽  
Asphalt Pavements ◽  
Advantages And Disadvantages ◽  
Specimen Test ◽  
Low Temperature Cracking

In cold regions and areas where there is a huge difference between high and low temperatures asphalt pavements are subject to low temperature cracking. The appeared cracks form pavement discontinuities, through which water penetrates into pavement structure. It reduces the bearing capacity of the whole pavement structure, weakens adhesion between bitumen and aggregate, affects bonding between layers and increases the development of frost heaves. A sealing of cracks deals with these issues. However, additional inspections after each winter have to be carried out to identify both cracks that have newly appeared and cracks that need to be resealed. These activities significantly increase road maintenance cost. Selection of the appropriate asphalt mixture by its performance at low temperatures reduces or even prevents low temperature cracking of asphalt pavements. A number of methods such as the Indirect Tensile Test, the Bending Beam Rheometer Test, the Thermal Stress Restrained Specimen Test, Asphalt Thermal Cracking Analyser, the Single-Edge-Notched Beam Test, the Disc-Shaped Compact Tension Test, the Semi-Circular Bend Test, the Fenix Test, Asphalt Concrete Cracking Device and Spectral Analysis of Acoustic Emission are developed to evaluate asphalt mixture resistance to low temperature cracking. This paper presents an analysis of these tests, emphasizes their advantages and disadvantages and gives limiting criteria to evaluate asphalt mixture resistance to low temperature cracking. The test advantages and disadvantages are deciding factors in a test selection. Some tests such as the Thermal Stress Restrained Specimen Test and Spectral Analysis of acoustic emission can directly reveal the lowest temperature at which asphalt mixture can withstand induced thermal stresses.

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