Evaluation of moisture conditioning effect on damage recovery of asphalt mixtures during rest time application

Mehrara, Amir; Khodaii, Ali

doi:10.1016/j.conbuildmat.2015.08.059

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…It can be stated that the micro crack healing process does not exhibit positive influence on permanent deformation of moisture damaged asphalt concrete. Such behavior agrees with the work reported by Mehrara and Khodaii, (2015) [2]. Phase angle is one of the main indicators for viscoelastic behavior of asphalt concrete.…”

Section: Influence Of Micro Crack Healing On Permanent Deformation Of...supporting

confidence: 92%

“…When the asphalt concrete mixture is subjected to sinusoidal varying stress, the resulting strain will also be sinusoidal, having the same angular frequency but retarded by a phase angle. The cyclic indirect tensile tests were conducted on moisture damaged and dry specimens under various testing temperature, rest period, and ageing by Mehrara and Khodaii, (2015) [2]. It was observed that moisture conditioning the specimens does not significantly affect their damage recovery potential for a constant load to strength ratio.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Micro-Crack Healing on Viscoelastic Properties of Moisture Damaged Asphalt Concrete

Sarsam¹

2022

CEBEL

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One of major asphalt pavement distresses is the moisture damage which influences the degradation of the viscoelastic properties of the mixture. The present work assesses the impact of practicing micro-crack healing on the viscoelastic properties of moisture damaged asphalt concrete. Roller compacted slab samples of asphalt concrete were prepared at optimum binder content. Beam specimens were obtained from the slab samples and subjected to moisture damage. Part of the asphalt concrete beam specimens were then tested under dynamic flexural stresses, while another part of the asphalt concrete beams was subjected to micro-cracks healing process using external heating at 60° C for 120 minutes, then tested under the dynamic flexural stresses. The viscoelastic properties of asphalt concrete in terms of permanent deformation, flexural stiffness, phase angle, and cumulative dissipated energy were monitored and compared among both testing conditions. It was observed that a significant increase in the flexural stiffness could be observed after healing. The increase in the phase angle after healing is significant at the early stages of loading. Higher cumulative dissipated energy could be observed for mixture which had practiced micro-crack healing. It was concluded that healing process does not exhibit positive influence on permanent deformation of moisture damaged asphalt concrete. A significant increase of 41.6 % in the flexural stiffness could be observed after healing after the first load repetition as compared with the mixture before healing. The permanent deformation after healing is higher by 22 % at failure as compared with that of mixture before healing.

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Section: Influence Of Micro Crack Healing On Permanent Deformation Of...supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Influence of Micro-Crack Healing on Viscoelastic Properties of Moisture Damaged Asphalt Concrete

Sarsam¹

2022

CEBEL

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“…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]. In another study, moisture penetration had a nominal influence on multiple fracture-rehealing behavior [18].…”

Section: Introductionmentioning

confidence: 97%

“…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%

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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“…This means that after the partial damage of the mastic-aggregate bonds, the adhesion might have been partially recovered after water removal from the interface of mastic with the aggregates. Mehrara and Khodaii (2015) also observed damage recovery of asphalt concrete samples based on normalized dissipated creep strain energy results, but only after the water that induced moisture damage had evaporated. The slight stiffness increase observed at condition F2 could be the result of this partial adhesion recovery, which may not be significant enough to reduce the confining pressure influence, indicated by the reduction of the k2 coefficient.…”

Section: X-ray Microctmentioning

confidence: 84%

Mechanical behavior of cold recycled asphalt mixtures.

Kuchiishi¹

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The Brazilian reduced paved road density, the increasingly demand for highways, and the lack of investment in preventive maintenance practices accelerate the occurrence of pavement distresses. This imparts for poor riding quality highways, resulting in higher fuel consumption, greater emission of pollutant gases, and increasing operational costs. In this scenario, cold recycling practices may be a cost-effective and environmental friendly alternative for pavement rehabilitation. The cold recycled asphalt mixtures (CRAMs) produced by cold recycling techniques, are comprised by reclaimed asphalt pavement (RAP), bitumen stabilized agents (asphalt emulsion or foamed asphalt), and active fillers (cement or hydrated lime). Despite the economical and sustainable benefits, the CRAMs exhibit a complex mechanical behavior since numerous variables can influence its stiffness. Therefore, the purpose of this study is to evaluate the CRAM' stiffness dependency regarding temperature, load frequency, stress-state and moisture content variation. Four types of CRAMs were collected from the field during experimental test section construction and were evaluated by means of laboratory tests. For temperature evaluation, the CRAMs linear viscoelastic properties were investigated by means of dynamic modulus and the results were used as input data for computational simulation. It was observed that the CRAMs viscoelastic properties influence the pavement mechanical response. For moisture evaluation, triaxial resilient modulus tests were conducted at different curing conditions. In conjunction with the filter paper test and X-ray micro computed tomography, a correspondence was observed between matric suction and resilient modulus. Besides, the CRAMs stress-state dependency was evaluated by means of pavement simulation and compared with in situ measurements. It was observed that the non-linear elastic behavior of CRAMs substantially influences the pavement mechanical behavior.

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Evaluation of moisture conditioning effect on damage recovery of asphalt mixtures during rest time application

Cited by 6 publications

References 14 publications

Influence of Micro-Crack Healing on Viscoelastic Properties of Moisture Damaged Asphalt Concrete

Influence of Micro-Crack Healing on Viscoelastic Properties of Moisture Damaged Asphalt Concrete

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

Mechanical behavior of cold recycled asphalt mixtures.

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