The reduction in the ability of bitumen to bond with the aggregate surface due to the infiltration of moisture has been recognised for years, and this deterioration phenomenon is called moisture damage. In general, the loss of bonding between bitumen and aggregate shortens the service life of the top layer of the pavement. Many investigations have been conducted to understand the mechanisms of moisture damage due to the loss of bonding strength between bitumen and aggregate and to find ways to improve and strengthen the bond to mitigate the effect of moisture. This paper reviews the extensive literature on the loss of bitumen-aggregate bonding strength due to moisture damage in asphalt mixtures. The general description of the theories and mechanisms that explain the effect of the thermodynamic, chemical, physical and mechanical characteristics of the bitumen and aggregate on the bonding phenomenon are discussed in this paper. In addition, the causes of and contributing factors to moisture damage and methods to improve the bond between bitumen and aggregates are also discussed. Moreover, a description of the test methods that can be used to evaluate moisture damage in poorly bonded and compacted mixtures are also presented. Special attention is given to a well-known method, known as the pull-off test, which has been successfully used to evaluate aggregate-binder bond strength, both for laboratory and in-situ tests. This includes the test methods, the factors that affect the bonding strength results and their correlation with other test method. A review of the failure mode of bitumen under the pull-off loading test is discussed in the final section of this paper.

https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1282&context=ccee_pubs

Effects of moisture damage on asphalt mixtures

AbstractWe investigated future changes in tropical cyclone (TC) activity and structure using the outputs of a 14-km mesh climate simulation. A set of 30-year simulations were performed under present-day and warmer climate conditions using a nonhydrostatic icosahedral atmospheric model with explicitly calculated convection. The model projected that the global frequency of TCs is reduced by 22.7%, the ratio of intense TCs is increased by 6.6%, and the precipitation rate within 100 km of the TC center increased by 11.8% under warmer climate conditions. These tendencies are consistent with previous studies using hydrostatic global model with cumulus parameterization.The responses of vertical and horizontal structures to global warming are investigated for TCs with the same intensity categories. For TCs whose minimum sea-level pressure (SLP) reaches less than 980 hPa, the model predicted that tangential wind increases in the outside region of the eyewall. Increases in the tangential wind are related to the ele...

Response of tropical cyclone activity and structure to a global warming in a high-resolution global nonhydrostatic model

In-situ recognition of moisture damage in bridge deck asphalt pavement with time-frequency features of GPR signal

The role of nanomaterials in reducing moisture damage of asphalt mixes

The compatibility between asphalt and nanosilica (nano-SiO2) is critical to determine the performance of nano-SiO2–modified asphalt However, a comprehensive understanding of the compatibility behavior and mechanism of asphalt components and nano-SiO2 in the modified asphalt is still limited In this study, the compatibility was revealed through molecular dynamics (MD) simulation Virgin asphalt, nano-SiO2–modified asphalt, and oxidation aged asphalt models produced with the COMPASS force field; meanwhile, the proposed models were validated by comparisons with reference data The compatibility of asphalt and nano-SiO2 was analyzed by solubility and the Flory–Huggins parameters and interaction energy Results show that the solubility parameters decreased with the increase of system temperature while increased with the asphalt’s oxidation level increase Meanwhile, the compatibility of the asphaltene, resin, and aromatic components in asphalt is better than the compatibility with saturates, which may be due to saturates being volatile; however, the compatibility of the nano-SiO2 and saturates is much better than those with asphaltene, resin, and aromatic components The incorporation of nano-SiO2 alleviates the volatilization of saturates The present results provide insights into the understanding of the compatibility behavior and mechanism of nano-SiO2 and asphalt components

Revealing compatibility mechanism of nanosilica in asphalt through molecular dynamics simulation

A review and perspective for research on moisture damage in asphalt pavement induced by dynamic pore water pressure

Intense rainfall induced by climate warming is causing more common extreme meteorological events such as urban waterlogging in recent years. The urban waterlogging often has a wide-ranged severe impact on urban traffic. General intense rainfall weather makes urban transportation frequently be served in an environment with abundant water, which not only affects its operation safety but also challenges the service life of urban asphalt pavement. This paper presents a comprehensive survey on the influence of intense rainfall on urban transportation. The characteristics of meteorological phenomena such as climate warming, intense typhoon and rainfall, and urban waterlogging are firstly discussed. Then, Shenzhen, the city in south China, is chosen to analyze its historical meteorological variation in recent years, which was recently affected by a typhoon name Ewiniar in 2018 and caused severe waterlogging throughout entire city. Further, the operation safety of urban traffic is investigated with an increasing depth of surface runoff in intense rainfall weather, followed by the service life of asphalt pavement related to the moisture damage induced by dynamic pore water pressure. Finally, a series of measures to alleviate the effects of intense rainfall induced by climate warming on urban waterlogging and long service life of asphalt pavement are recommended.

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A survey on the influence of intense rainfall induced by climate warming on operation safety and service life of urban asphalt pavement

Understanding the relationships between rheology and chemistry of asphalt binders: A review

Moisture damage induced by dynamic pore water pressure commonly occurs in asphalt pavement with a service environment of frequent contact with liquid water. Dynamic water environment exhibits a different mechanism of moisture damage comparing with traditional static water immersion and freeze-thaw. The influencing factors of dynamic water environment mainly include the magnitude of pore water pressure, water temperature, and conditioning duration. This paper presents a study on evaluating and quantifying these factors’ degree of influence on moisture sensitivity of asphalt mixture using the orthogonal test and the gray correlation analysis method. A new method for moisture sensitivity evaluation was thus proposed based on dynamic water environment conditioning and uniaxial penetration strength test. Finally, the influence of materials’ properties on moisture sensitivity were further investigated. The results indicated that the ranking of factors impacting the indicator of fracture work density was water temperature, followed by pore water pressure and conditioning duration. A representative parameter combination of 60℃, 0.345 MPa, and 4000 cycles was thus recommended. It was found that dynamic water environment was harsher than static water immersion and almost equal to and even harsher than freeze-thaw. The indicator of fracture work density ratio, which took deformation feature of asphalt mixture into account, could well assess moisture sensitivity. Retained mechanical performance of water-conditioned asphalt mixture decreased with the increase of air void content. SBS modified asphalt binder significantly improved the resistance to moisture damage for asphalt mixture.

Evaluation on moisture sensitivity of asphalt mixture induced by dynamic pore water pressure

Evaluation on moisture sensitivity induced by dynamic pore water pressure for asphalt mixture and its components using the bending beam rheometer method

Wentao Wang

Papers

A review and perspective for research on moisture damage in asphalt pavement induced by dynamic pore water pressure

A survey on the influence of intense rainfall induced by climate warming on operation safety and service life of urban asphalt pavement

Understanding the relationships between rheology and chemistry of asphalt binders: A review

Evaluation on moisture sensitivity of asphalt mixture induced by dynamic pore water pressure

Evaluation on moisture sensitivity induced by dynamic pore water pressure for asphalt mixture and its components using the bending beam rheometer method