Chemical and mechanical changes in asphalt binder due to moisture conditioning

Ahmad, Mohiuddin; Mannan, Umme Amina; Islam, M. R.; Tarefder, Rafiqul A.

doi:10.1080/14680629.2017.1299631

Cited by 34 publications

(9 citation statements)

References 8 publications

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“…Figure 12 shows the effects of the molecular weight distribution and the branching of wax and asphaltene on the moisture sensitivity index, ER. It can be seen from the figure that: (1) The ER of high-wax asphalt B and its model asphalt is higher than that of the corresponding low-wax asphalt A and its model asphalt. In addition, the moisture sensitivity of asphalts A and B can be improved by adding C20, C30, Sq and As.…”

Section: Moisture Sensitivity Analysis Based On Sfementioning

confidence: 93%

“…(4) In dry conditions, the adhesion work of all the model asphalts (including the base asphalt) is greater than that of the cohesion work, which explains, from the point of view of energy, that there is usually a cohesion failure rather than adhesion failure in the BBS test in dry conditions. Figure 11 shows the adhesion work of asphalt samples in wet conditions, which shows that in wet conditions: (1) The adhesion work of all asphalt samples is a negative number, indicating that asphalt spalling from the aggregate surface occurs spontaneously in wet conditions, and the higher the value, the easier it is for asphalt to spontaneously peel off from the aggregate surface. (2) The addition of C20, C30 and Sq into A and B can reduce the absolute value of the adhesion work, however, the addition of As has no obvious effect on it.…”

Section: Cohesion and Adhesion Work Analysis Based On Sfementioning

confidence: 99%

“…The strong moisture sensitivity of asphalt mixture is one of the main reasons for early distresses in asphalt pavement, such as grouting, spalling, looseness and potholes [1]. The process of moisture-induced damage to an asphalt mixture is complex, involving many reactions and theories, such as mechanics, physics, chemistry and thermodynamics [2].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Wax Molecular Weight Distribution and Branching on Moisture Sensitivity of Asphalt Binders

et al. 2022

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Wax is an important factor that affects the durability of asphalt binder. In order to understand the molecular weight distribution and branching of wax on the moisture sensitivity of asphalt binder, pure wax-doped asphalt binders are prepared and the performance of model asphalt binders are evaluated by surface free-energy (SFE) and binder bond strength (BBS) tests. In addition, asphaltene is regarded as an additive in this study. The results show that the addition of eicosane, triacontane, squalane and asphaltene can reduce the moisture sensitivity of asphalt, but not necessarily improve its moisture-induced damage resistance. The physical hardening effect of high-wax asphalt and its model asphalt is stronger than that of the corresponding low-wax asphalt and its model asphalt, and its moisture sensitivity is weaker than that of the low-wax asphalt. For all the model asphalts, there is a good correlation between the cohesion work, cohesion POTS (pull-off tensile strength), POTS ratio (the BBS moisture sensitivity index) and ER (the SFE moisture sensitivity index). When using the BBS test to characterize the moisture sensitivity of high-wax asphalt, it is recommended to leave the sample for some time until it is physically hardened and stable.

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Section: Moisture Sensitivity Analysis Based On Sfementioning

confidence: 93%

Section: Cohesion and Adhesion Work Analysis Based On Sfementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Wax Molecular Weight Distribution and Branching on Moisture Sensitivity of Asphalt Binders

et al. 2022

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“…Some of the infrared radiation is absorbed by the sample and some of it is passed through or transmitted. Molecular bonds vibrating at resonance frequencies absorb radiation which matches the transition energy of the bond or group that vibrates at these resonance frequencies ( 26 ). The amount of energy absorbed is plotted against the wavenumber.…”

Section: Materials Testingmentioning

confidence: 99%

Tribological Evaluation for an In-Depth Understanding of Improved Workability of Foamed Asphalt

Bairgi

Mannan

Tarefder

2019

Transportation Research Record: Journal of the Transportation R

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Asphalt binder acts as a lubricant between two aggregates during mixing and compaction. The frictional behavior of asphalt binder as a lubricant in an asphalt-aggregate system plays an important role in mixing and compaction (workability) of warm-mix asphalt (WMA). This study evaluates the frictional behavior of foamed WMA through tribological characterization using a ball-on-three-plates apparatus assembled inside a dynamic shear rheometer (DSR). The tribological test was conducted on six foamed asphalts with varying foaming water contents (FWCs) and on a controlled unfoamed asphalt binder at four different temperatures: 25°C, 60°C, 100°C, and 135°C. These binders were also characterized for rheological and chemical properties. Test results show that the foaming process alters the frictional resistance of the foamed asphalts; specifically, the foaming process reduces the coefficient of friction in elastohydrodynamic and hydrodynamic lubrication regimes. Reduced frictional resistance helps in the formation of a better coating during mixing and improves the sliding ability between aggregates during compaction at reduced temperature.

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“…However, moisture induced damage may also include loss of material-dislodgement of aggregates and loss of binder compounds, which could have an influence on the loss of mechanical properties or performance of the mixes. Though there was no comprehensive study reported in this regard, a previous study had identified the physical and chemical changes of asphalt binder from moisture conditioning [2]. The present study is conducted to evaluate the use of Moisture Induced Stress Tester (MIST), assess the loss of materials and change in mechanical properties as a potential approach for identifying moisture susceptible HMA during mix design.…”

Section: Introductionmentioning

confidence: 99%

Hot mix asphalt (HMA) moisture susceptibility analysis: material loss to mechanical properties

et al. 2019

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Numerous studies have been conducted to identify moisture sensitive mixes during mix design by simulating various mechanisms of moisture damage. These methods involve the determination of changes in strength or stiffness of asphalt mixes due to moisture conditioning. The objective of this study is to understand the coupled problem of moisture induced material loss and change in strength/stiffness of the mix. Moisture Induced Stress Tester was used for conditioning samples of a poor and a good performing mixes. This test applies cyclic pressures in the asphalt mix samples through repeated pulses of water. The effluent containing aggregates and binder that were dislodged from the samples during the moisture conditioning process were collected for testing. Both coated and uncoated/fractured aggregates were found in the effluent. The results indicated that the samples with a higher loss of asphalt binder compared to other samples in the investigation during conditioning may exhibit higher tensile strengths, and those with a loss of finer materials, which is indicative of aggregate breakdown, show a lower tensile strength. Both seismic modulus and indirect tensile strength tests were found to be able to differentiate the poor and good performing mixes. For the mixes used in this study, the rate of change in indirect tensile strength during moisture conditioning was found to be strongly correlated to the pre-conditioning modulus of the mix, and a method is suggested for using the threshold values of properties of pre-conditioning mixes for different durations of moisture conditioning during mix design to screen poor mixes in a fast and nondestructive manner. Keywords HMA • Seismic modulus • Indirect tensile strength • Dissolved organic carbon • Moisture induced stress tester • Moisture damage • Loss of aggregates • Loss of asphalt binder * Uma Maheswar Arepalli,

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Chemical and mechanical changes in asphalt binder due to moisture conditioning

Cited by 34 publications

References 8 publications

Effects of Wax Molecular Weight Distribution and Branching on Moisture Sensitivity of Asphalt Binders

Effects of Wax Molecular Weight Distribution and Branching on Moisture Sensitivity of Asphalt Binders

Tribological Evaluation for an In-Depth Understanding of Improved Workability of Foamed Asphalt

Hot mix asphalt (HMA) moisture susceptibility analysis: material loss to mechanical properties

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