Influence of moisture conditioning on healing of asphalt binders

Mannan, Umme Amina; Ahmad, Mohiuddin; Tarefder, Rafiqul A.

doi:10.1016/j.conbuildmat.2017.04.087

Cited by 49 publications

(11 citation statements)

References 12 publications

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“…Nevertheless, when microcracks are generated or these substances are not added at the manufacturing phase, some additional substances such as healing agents are required to seal and fill cracks in order to enhance healing [17,18]. Bitumen healing is reported greatly sensitive to moisture conditioning [19]. Some studies also indicated that the conductivity of asphalt mixtures depends on the amount of conductive fibers used and an excessive amount of conductive materials can result in the degeneration of the asphalt mixture characteristics [20].…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that the presence of moisture could result in damages in asphalt mixtures by displacement, detachment, PH instability, pore pressure, and hydraulic scour [28]. Some studies have tried to recover the moisture characteristics in asphalt mixtures damaged along with the investigation of the healing process [16,19,29]. e presence of moisture was stated harmful for microwave healing and induction of reinforced mixtures by fibers, although it enhanced the heating rate of the mixtures [16].…”

Section: Introductionmentioning

confidence: 99%

“…e presence of moisture was stated harmful for microwave healing and induction of reinforced mixtures by fibers, although it enhanced the heating rate of the mixtures [16]. Moreover, conditioning of mixtures by moisture was illustrated to have a negative effect on the self-healing of bitumens [19]. By contrast, saturated samples in moisture were observed to recover from damages caused fatigue in an allowed sufficient rest time [25,29].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Moisture Sensitivity and Conductivity Properties of Inductive Asphalt Mixtures Containing Steel Wool Fiber

Hosseinian

Gilani

Joobani

et al. 2020

Advances in Civil Engineering

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The construction of suitable roads in rainy areas has created problems in the construction process due to the low resistance of asphalt to moisture. To solve this problem, materials are commonly used that make mixtures resistant to moisture; however, these materials may reduce the dynamic resistance of asphalt. Therefore, materials should be used that, in addition to increasing the dynamic resistance, also increase the moisture resistance of asphalt mixtures. One of these materials used in this research is steel wool fiber (SWF), which in addition to creating conductive roads also could have a significant effect on moisture resistance. In this study, the impact of 2%, 4%, 6%, 8%, and 10% SWF on the Marshall stability and moisture sensitivity of mixtures was investigated using the Marshall stability and indirect tensile strength (ITS) tests, respectively. Moreover, using SWF as a conductive fiber, the conductivity properties of asphalt mixtures were explored to find the optimal amount of electrical conductivity. The results of the Marshall stability test indicated that by increasing SWF contents, the stability of mixtures increased, compared with the base sample, and greater amounts of 6% SWF resulted in the reduction of the Marshall stability. The results of ITS showed that modification of bitumen by SWF increased ITS and tensile strength ratio (TSR) amounts of mixtures. 6% SWF was the optimal amount for enhancing the resistance of asphalt mixtures to moisture sensitivity. The results of the electrical resistivity test showed that the resistivity had three phases: high resistivity, transit, and low resistivity. Mixtures containing less than 4% SWF illustrated an insulating behavior, with electrical resistivity greater than 7.62 × 108 Ω . m . At the transit phase, the resistivity of mixtures had a sharp reduction from 7.62 × 108 Ω . m to 6.17 × 104 Ω . m . Finally, 8% SWF was known as the optimal content for the electrical conductivity of mixtures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Moisture Sensitivity and Conductivity Properties of Inductive Asphalt Mixtures Containing Steel Wool Fiber

Hosseinian

Gilani

Joobani

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…A DSR test was conducted to evaluate the healing capacity of bitumen mixtures based on an empirical metric that looks at recovery of | G* | after loading. − This test used the same geometry and test temperature as the MSCR test and was performed for three replicates each of control bitumen and sulfur-modified bitumen. Each sample was sheared at a strain of 5% and a frequency of 10 Hz until | G* | was reduced to 50% of the initial value.…”

Section: Experimental Methodsmentioning

confidence: 99%

Effects of Elemental Sulfur on the Aging Trajectory and Adhesion Characteristics of Rubber-Modified Bitumen

Hung

Fini

2021

ACS Sustainable Chem. Eng.

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This study examines the role of sulfur in rubber-modified bitumen and its response to ultraviolet (UV) exposure in terms of its viscoelasticity, creep recovery, healing behavior, surface chemical oxidation, and surface adhesion. Infrared spectroscopy showed a pronounced enrichment of oxidized sulfur and carbon compounds at the surface of sulfur-modified bitumen after mild heating and especially after UV irradiation. 3% added sulfur increased bitumen plasticity by all measures. UV aging marginally decreased bulk metrics of self-healing, but it severely diminished surface adhesion values, indicating that bulk metrics may not be able to accurately reflect crack-healing behavior if bitumen surfaces are prone to oxidative degradation.

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“…Liu et al (2016) concluded that thermal activated healing of micro cracks was clearly practical to extend the fatigue life of bitumen and different kinds of bitumen needed to be heated to specific softening point related temperatures to substantially enhance the healing ability and rate. Mannan et al (2017) found that moisture diffused into the bitumen can reduce the value of short-term healing by lessening the cohesive energy used to crack the bitumen, and decrease the value of long-term healing by raising the required activation energy for bituminous molecular diffusion. Norambuena-Contreras et al (2018) found that ageing levels can evidently degrade the healing effect of asphalt mixture.…”

Section: Introductionmentioning

confidence: 99%

Crack length based healing characterisation of bitumen at different levels of cracking damage

Gao

Zhang

2020

Journal of Cleaner Production

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This study aims to characterise the healing properties of asphalt binders at different damage levels. The healing and the damage levels were quantified by crack length (CL) in binder samples generated by rotational shear fatigue loads in strain-controlled dynamic shear rheometer (DSR) tests. For comparison, the healing was also characterised by the commonly used material parameters including pseudo shear stiffness (S) and dissipated pseudo strain energy (DPSE). A normalized healing index was formulated using the above three parameters, respectively. A healing test of polymer-modified bitumen was designed based on DSR including a straincontrolled time sweep test plus a rest duration and followed by another strain-controlled time sweep test. The healing tests were performed at different rest start times (5min, 10min and 20min), rest durations (5s, 10s, 0.5min, 1min, 2min, 5min, 10min, 20min, and 40min), and amplitudes of the shear strain (5%, 7%, and 10%) at 20°C and 10Hz. Results show that the CLbased healing index is a fundamental and accurate parameter to evaluate the healing rate and healing potential of the bitumen. DPSE-based healing index is applicable only when the energy is mainly dissipated to generate cracks. Healing is underestimated when characterised using S or DPSE-based healing indices. Healing index increases due to the advance of rest duration or the decrease of the damage level, and the healing rate can be essentially modelled by Ramberg-Osgood model. Higher damage levels (introduced by higher load levels or longer loading time) can effectively decrease the binders' healing potentials when the binders are at the relatively low damaged levels. The healing potential becomes low when the material is at severe damage state, thus will remain at that low levels even though the damage level increases.

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Influence of moisture conditioning on healing of asphalt binders

Cited by 49 publications

References 12 publications

Investigation of Moisture Sensitivity and Conductivity Properties of Inductive Asphalt Mixtures Containing Steel Wool Fiber

Investigation of Moisture Sensitivity and Conductivity Properties of Inductive Asphalt Mixtures Containing Steel Wool Fiber

Effects of Elemental Sulfur on the Aging Trajectory and Adhesion Characteristics of Rubber-Modified Bitumen

Crack length based healing characterisation of bitumen at different levels of cracking damage

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