Heating effects of asphalt pavement during hot in-place recycling using DEM

Huang, Kai; Xu, Tao; Li, Guofen; Jiang, Ruilin

doi:10.1016/j.conbuildmat.2016.04.033

Cited by 36 publications

(9 citation statements)

References 33 publications

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“…To increase pothole repair performance and durability, ongoing research suggests preheating the pothole excavation prior to repair using infrared heat. The use and effectiveness of infrared and microwave technology in asphalt repair has been studied by Kandhal and Rao (1994), Clyne et al (2010), Uzarowski et al (2011), Williams (2011), Freeman and Epps (2012), Nazzal et al (2014), and Huang et al (2016). These studies acknowledge that preheating of the old pavement prior to repair increases the density of the mixture in the repair interface and its adhesion.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Hot Mix Asphalt Pothole Repair by Finite-Element Method

Byzyka

Rahman

Chamberlain

2020

J. Transp. Eng., Part B: Pavements

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Traditional repair methods tend to suffer from inadequate net interface heating because the combined effect of placing hot fill mix in a cold, old pavement leads to inadequate net temperature levels. The outcome of this is low durability and limited life. In contrast, the outcome of placing hot mix in a controlled, preheated host pavement is substantial increased working life. To understand repair heating, this study ran heat transfer finite-element models for the cases of (1) hot mix asphalt (HMA) placed in an ambient temperature pothole, (2) the heated pothole recess, and (3) HMA placed in the preheated pothole recess. The air-pavement-heater system model comprises a host pavement with two pothole repairs or, in the case of the second thermal model, with one empty pothole excavation, and an infrared heating element plate. For calibration purposes, experimental work of simulated repairs undertaken in previous research was used. The air-pavement-heater system setup followed an optimum pothole preheating method also determined in previous research. Thermal models were validated with previous experimental work. It was concluded that the models generate reasonable transient temperature profiles within the dynamically heated pothole excavation, at the interface of the repairs, and inside the host pavement.

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Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Hot Mix Asphalt Pothole Repair by Finite-Element Method

Byzyka

Rahman

Chamberlain

2020

J. Transp. Eng., Part B: Pavements

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“…Besides, it can not only greatly improve the interlayer combination of asphalt pavement, but also reduce the occurrence of various diseases in its service period. This provides great economic and social benefits in the maintenance of the road, especially for high grade pavement [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Demulsification Speed of Emulsified Asphalt based on Surface Characteristics of Aggregates

Tang

et al. 2018

Materials

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Aggregate is an indispensable raw material for emulsified asphalt construction. For the purpose of explaining the influence of aggregate characteristics on the demulsification speed of emulsified asphalt, the surface energy and specific surface area (SSA) characteristics of aggregates were calculated based on the capillary rise method and the BET (Brunauer-Emmett-Teller) adsorption test. Afterwards, the effect of the surface energy and specific surface area of the aggregate on the emulsified asphalt demulsification speed was systematically studied by using ultraviolet spectroscopy as well as the orthogonal test. Experimental results indicate that the specific surface energy parameter of the aggregate is certainly related to the particle size of the aggregate. That is, the surface free energy of the unit system is proportional to the surface area A and the density of the interface unit. The specific surface area parameter of aggregates increases with the decrease of particle size, when the particle size is reduced to 600 mesh, the specific surface area parameters of the three aggregates selected in this paper tend to be consistent. Orthogonal experimental analysis demonstrates that the surface energy and specific surface area have an impact on the emulsion breaking speed and they are proven to be positively correlated. Meanwhile, in the case of small particle sizes, there is no statistically significant correlation between the physical properties of aggregates and the demulsification speed of emulsified asphalt, and the physical property of aggregates is not the main factor that affects the demulsification speed of the emulsified asphalt. On the contrary, the material properties of the aggregate, such as acid-base property and chargeability, are the dominant factors.

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“…It can only be used for short segments of roadway, such as bridges. 4 The external heating method involves the use of high-temperature air produced by an old aircra engine to melt snow and ice. The exhaust from the engine, at high temperatures of up to 400-500 C, is usually used as the external heat source.…”

Section: Introductionmentioning

confidence: 99%