An FEM-predictive tool for simulating the cooling characteristics of freshly paved asphalt concrete layers

Kassem, Hussein; Chehab, Ghassan R.; Saad, George

doi:10.1080/10298436.2014.937714

Cited by 18 publications

(6 citation statements)

References 11 publications

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“…During convective heat transfer, heat exchange occurs between the asphalt pavement surface and adjacent air. Based on Newton’s convection cooling law [ 45 ], the convection heat transfer q c can be calculated as:

where β is the convection heat transfer coefficient (W·m −2 ·K −1 ); β = 3.0 v + 5.6, in which v is the wind speed (m·s −1 ); A is the contact area (m 2 ); and T a is the air temperature (°C).…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Stone Mastic Asphalt Containing Ceramic Waste Aggregate for Cooling Asphalt Pavement

Huang

Qian

et al. 2020

Materials

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Construction and demolition waste material is of great potential for use in pavement engineering. This paper aims to investigate the feasibility of ceramic waste aggregate (CA) used in cooling asphalt pavement through a series of test methods and simulation techniques. Stone mastic asphalt (SMA) containing 10%, 20%, 30%, 40%, and 50% coarse ceramic waste aggregate (CASMAs) was first designed using the Marshall method. Afterward, the road performance and thermal insulation performance of the five different CASMAs were assessed by a comprehensive lab test, including a wheel rutting test, moisture susceptibility test, bending beam test, fatigue beam test, and indoor thermal insulation test. Finally, a 2D finite-element (FE) model was developed to investigate the transient thermal field and rutting deformation response of the cooling asphalt pavement with CASMAs. Results show that CASMAs experienced degradation of rutting resistance, moisture susceptibility, and anti-cracking performance while still meeting technical requirements with CA content of up to 40%. On the other hand, CASMAs can cool the pavement’s temperature by 11.5 °C at the bottom of asphalt layers. The permanent rutting deformation of cooling asphalt pavement was 45.36% smaller than that of conventional asphalt pavement without CASMAs. Based on the test results and numerical simulation results, the optimum content of ceramic waste aggregate in stone mastic asphalt was recommended as 40%.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Stone Mastic Asphalt Containing Ceramic Waste Aggregate for Cooling Asphalt Pavement

Huang

Qian

et al. 2020

Materials

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“…The model also allows for a wide variety of climatic conditions and thermophysical properties of the paving material. The use of FEM has been successfully used in many studies [26][27][28] in predicting the cooling of newly laid asphalt.…”

Section: Heat Transfer Model Of Asphalt Coolingmentioning

confidence: 99%

Warm mix asphalt (WMA) for rapid construction in airfield pavement

Rahman

Dawson

Thom

2020

Construction and Building Materials

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Warm-mix asphalt (WMA) is commonly mixed and compacted 15°C to 30°C below that of conventional hot mix asphalt (HMA). The lower production temperature of WMA is expected to give an advantage of a lower cooling time of newly laid asphalt overlay before it can be opened to traffic during the nighttime airfield pavement construction. The reduced cooling time of WMA would allow shorter airport closure time window and/or extend the time for the contractor for paving, and thus shorten the overall construction period due to more volume done each night. This is a beneficial practical advantage to hectic airports where the typical off-peak period is as short as 6-8 hours. In this research, two different WMA technologies, Sasobit® and Rediset® (organic and chemical) were investigated through laboratory tests to see if there were notable differences in WMA rutting performance that could have considerable practical effects on the permissible temperature at the opening to traffic as compared to the HMA. Furthermore, a validated finite element (FE) solution for one-dimensional transient heat-transfer model is used to simulate the effect of the use of warm mix on shortening the cooling time and the overall project time. The laboratory test shows that the WMA with Sasobit has a significantly better rutting performance at the elevated temperature, enabling the WMA to be opened to traffic at a higher temperature, compared to HMA. The cooling analysis showed that, in comparison to HMA, the use of WMA could shorten the closure time of airport during the night time construction by 8-67 minutes, depending on the asphalt overlay thickness, traffic opening temperature and WMA production temperature. The use of WMA could also minimize the overall construction period by 2-16 nights for a single lift overlay, for the cases studied.

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“…where T sur (°C) is the pavement surface temperature, T air (°C) is the air temperature, and h (W/(m 2 •°C)) is the convective heat-transfer coefficient, which is influenced by wind speed and could be calculated through the following [16]:…”

Section: Convectionmentioning

confidence: 99%

“…Due to the database established in the 1990s, temperature prediction models were improved and perfected [11][12][13][14]. In addition, temperature variation was simulated in a short period such as 1 day or 1 h, typically through the finiteelement (FE) method [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, for the simulation of pavement mechanical responses, research could be divided into two categories approximately: the mechanical property of asphalt mixtures under different temperatures [18][19][20], that is, through the destructive test under a specific temperature, and the mechanical simulation of asphalt pavements under the ambient temperature [16,[21][22][23][24], that is, through the grounded methodology for the Chinese pavement structure design or FE analysis. e key for accurate prediction of pavement mechanics is to simulate pavement responses more realistically in terms of loading conditions, material characterization, and environmental situations.…”

Section: Introductionmentioning

confidence: 99%

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Temperature Adaptability of Asphalt Pavement to High Temperatures and Significant Temperature Differences

Zhao

2018

Advances in Materials Science and Engineering

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Temperature adaptability of asphalt pavements is very important, due to their potential influence on pavement structure design, particularly in areas that experience significant temperature differences. In this paper, a finite element (FE) model was developed, and Turpan-Xiaocao Lake Highway in southern Xinjiang was taken as a case study engineering, which tends to experience this adverse environmental condition (temperature difference: 25.5°C; July 14, 2008). In this model, the generalized Kelvin model and the Burgers model were used. The time-dependent tire pressure was considered. To guide pavement structure design and control pavement distresses in this area, seven alternative pavement structures were selected to simulate and analyze pavement temperature fields and the mechanical responses. It was observed that the influence of air temperature had the greatest impact on Str-1, possibly due to the thinnest asphalt course. Moreover, when rutting depth, maximum shear stress of the asphalt course, deflection on the pavement surface, and compressive strains at the subgrade top surface were taken as the evaluation indices, the adaptability of asphalt pavements using compound base courses had obvious advantage due to their strong absorption and reflection of load impact. The adaptability of seven structures analyzed in this paper decreased in the following order: Str-5 > Str-6 > Str-4 > Str-2 > Str-m > Str-1 > Str-3. In addition, it broke the traditional view that asphalt pavement with a flexible base had the poor ability on rutting resistance. Besides, it also suggests that when the thickness of asphalt courses was equivalent, increasing the thickness of chemical-treated base courses would help with the deformation resistance, and vice versa.

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An FEM-predictive tool for simulating the cooling characteristics of freshly paved asphalt concrete layers

Cited by 18 publications

References 11 publications

Evaluation of Stone Mastic Asphalt Containing Ceramic Waste Aggregate for Cooling Asphalt Pavement

Evaluation of Stone Mastic Asphalt Containing Ceramic Waste Aggregate for Cooling Asphalt Pavement

Warm mix asphalt (WMA) for rapid construction in airfield pavement

Temperature Adaptability of Asphalt Pavement to High Temperatures and Significant Temperature Differences

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