Reserving the Sustainability of Flexible Pavement In Terms Of Microcrack Healing

2021 ◽  
Author(s):  
Saad Sarsam ◽  
Keyword(s):  
Fatigue Life ◽  
Asphalt Concrete ◽  
Concrete Pavement ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Actual Behavior ◽  
Self Healing ◽  
Traffic Loading ◽  
Asphalt Cement ◽  
Asphalt Concrete Pavement

The fatigue life of Asphalt concrete pavement consists of two components, namely the resistance to fracture and crack, and the ability to heal the micro cracks. Both processes changes with temperature and time. Such processes exhibit the sustainability potential of asphalt concrete pavement. Repeated traffic loading and environmental impact causes deterioration in asphalt concrete pavement mixes and exhibit micro cracking and decreases its stiffness. However, due to the crack healing phenomena effect, asphalt mixes can demonstrate strength recovery and prolongs the fatigue life of asphalt mixtures. Many studies have been conducted to characterize the asphalt healing and its mechanisms. The approach to study this potential requires implementation of proper additives to the asphalt cement which can improve the self healing property of asphalt concrete and reserve the quality of the pavement. The aim of this work is to thoroughly understand the cracking and healing mechanisms and to define appropriate laboratory tests and type of additives which can increase the healing potential and can be used for a reliable performance-related selection and characterization of the asphalt binders, and the suitable asphalt concrete mixture based on the traffic loading and the environment issues. It was felt that it is essential to evaluate whether it is possible to achieve accelerated healing in asphalt mixtures within laboratory conditions, which could represent the actual behavior in the field. It was concluded that the process of healing is a sustainable measure and can be used to balance the damage process. The influence of several additives on the microcrack healing concept was discussed. The amount and rate of healing of asphalt cement which depend on several properties such as; its healing potential, stiffness, and surface free energy was also analized.

Analysis of Dynamic Deviator Stress of Reinfored Subgrade under Traffic Loading

2012 ◽  
Vol 178-181 ◽  
pp. 1392-1395
Author(s):  
Shi Chuan Wang
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Compressive Stress ◽  
Asphalt Concrete ◽  
Residual Deformation ◽  
Concrete Pavement ◽  
Key Factors ◽  
Traffic Loading ◽  
Deviator Stress ◽  
Asphalt Concrete Pavement

In order to study the influence of reinforcement on the distribution of dynamic deviator stress along the depth of subgrade, reinforced and unreinforced subgrade of graded-broken-stone-based asphalt concrete pavement under traffic loading was modeled by implicit dynamic FEM. Analytical results show that reinforcement can improve the vertical compressive stress distribution, and decrease shear stress transmitted to the surface of subgrade. The deviator stress on the upper part of reinforced subgrade is reduced distinctly, which is one of the key factors that can cause residual deformation. Therefore, reinforcement can restrain the development of residual deformation of subgrade induced by traffic loading.

Analysis on the Traffic-Response of Asphalt Concrete Overlay on PCC-Slab

2012 ◽  
Vol 178-181 ◽  
pp. 1623-1627
Author(s):  
Wei Xu ◽  
Xuan Cang Wang ◽  
Shan Qiang Li
Keyword(s):  
Finite Element ◽  
Asphalt Concrete ◽  
Element Model ◽  
Concrete Pavement ◽  
Comprehensive Model ◽  
Reflective Cracking ◽  
Traffic Loading ◽  
Asphalt Overlay ◽  
Pavement Construction ◽  
Asphalt Concrete Pavement

Focusing on the severity of asphalt concrete pavement crack, the optimization analyzing finite element model(FEM) of typical asphalt overlay pavement was developed to address reflective cracking, in which the analysis of traffic-loading response were concentrated on the stress-intensive areas close to the joints or cracks. The FE sensitive analysis, evaluating the influence of pavement construction parameters, including modulus and thickness of pavement courses, is useful to establish comprehensive model of overlay pavement construction.

Experience of application of epoxн asphalt concrete pavement on road bridges

2019 ◽  
pp. 78-92
Author(s):  
Vladimir Zelenovsky ◽  
◽  
Ivan Kopinets ◽  
Arthur Onishchenko ◽  
◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Concrete Pavement ◽  
Asphalt Concrete Pavement

Effect of Healing on Fatigue Law Parameters of Asphalt Binders

2012 ◽  
Vol 2293 (1) ◽  
pp. 96-105 ◽  
Author(s):  
Arianna Stimilli ◽  
Cassie Hintz ◽  
Zhijun Li ◽  
Raul Velasquez ◽  
Hussain U. Bahia
Keyword(s):  
Fatigue Life ◽  
Asphalt Binder ◽  
Rest Period ◽  
Power Laws ◽  
Asphalt Binders ◽  
Traffic Loading ◽  
Damage Level ◽  
Rest Periods ◽  
Pavement Structure ◽  
Number Of Cycles

Asphalt binder has the ability to self-heal during rest periods when repetitive loading is applied. Studying the effect of rest on fatigue law parameters provides useful insight into the healing capabilities of asphalt binders. Currently, standard testing and analysis procedures to quantify asphalt binder healing capability are limited and difficult to implement in practice. Fatigue is known to depend on both traffic loading and pavement structure. Power law relations (e.g., Nf = Aγ−B) are commonly used for fatigue analysis of pavement materials. Power laws are used to estimate fatigue life (i.e., number of cycles to failure, Nf) as a function of load amplitude (e.g., strain, γ), which is a reflection of the pavement structure. In this study, testing consisted of strain-controlled time sweeps in the dynamic shear rheometer with a single rest period inserted at a specified damage level. With the selected test, the effect of healing on the relationship between fatigue life and strain was investigated. Nine neat and modified binders were tested. Healing testing was conducted at multiple age levels and strains. Healing that resulted from a single rest period had an insignificant effect on fatigue performance compared with modification and oxidative aging. Although this paper highlights the challenges of using few rest periods to predict healing potential, preliminary results of testing with multiple rest periods show the importance of healing. Further investigation is needed to verify the effect of multiple rest periods on binder fatigue.

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