Airborne Emissions Assessment of Hot Asphalt Mixing Methods and Limitations

Jullien, Agnès; Gaudefroy, Vincent; Ventura, Anne; Paranhos, Régis Sebben; Moneron, P

doi:10.3166/rmpd.11.149-169

Cited by 11 publications

(11 citation statements)

References 14 publications

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“…A particle mass concentration peak was generated during this period, certainly due to the slight over-heating of the bitumen during the first 30 minutes of heating. This phenomenon was also observed in previous studies [12] [13], proving that it is a reproducible behaviour. Although the bitumen temperature was stabilized within 1 hour, an additional period of 45 minutes was necessary to stabilize the particle concentration and the temperature inside the exposure chamber.…”

Section: Field Samplingsupporting

confidence: 88%

Performances of a Bitumen Fume and Condensate Generation System for Sampling Method Development

Sutter¹,

Pelletier²,

Ravera³

et al. 2016

JEP

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International audienceA laboratory system was designed to generate bitumen fumes and expose tested samplers in a homogenised chamber. The system was also designed to condense the fumes in the form of oil that could be used as a standard for further analytical method development. The laboratory system was evaluated in terms of stability, repeatability, aging, and ranges, focusing on the quality and quantity of the fumes and their physical characteristics. The fumes generated with the laboratory system were also compared to fumes emitted at workplaces to evaluate their similarity. The results demonstrated that laboratory fume generation was stable and repeatable. Humidity ranged from 20% to 80% RH and the total fume concentration ranged from 0.01 to 9.36 mg • m −3 , covering the conditions encountered for road paving worksites. The fumes generated in the laboratory were found to be similar to those of workplaces, with slight differences in light compounds equivalent to C12 and below n-alkanes. Thus, the system designed in this study is considered capable of generating bitumen fumes used to develop sampling and analysis methods

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Section: Field Samplingsupporting

confidence: 88%

Performances of a Bitumen Fume and Condensate Generation System for Sampling Method Development

Sutter¹,

Pelletier²,

Ravera³

et al. 2016

JEP

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show abstract

“…New technologies are being developed by the asphalt industries, seeking a lower energy requirement to blend asphalt mixes, which, in return, will result in less fuel consumption and reduced emission of greenhouse gases, such as Warm mix asphalt (WMA), that enables the mixing and compaction of asphalt mixes at lower temperatures [11]. Recently, Jullien et al [12] studied the influence of operating parameters on airborne emissions at the asphalt plant stack for a given set of production conditions. Results highlight the correlation in emission flows with combustion intensity and energy consump tion, and combustion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analysis in an asphalt plant’s rotary dryer

Peinado

Vega

García-Hernando

et al. 2011

Applied Thermal Engineering

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a b s t r a c tIn this paper, energy and exergy analyses of a rotary dryer employed in a Hot Mix Asphalt (HMA) plant for heating and drying of the aggregates in the mixture is presented. In the analysis, the exergy method in addition to the more conventional energy analysis, is employed to identify and evaluate the ther modynamic losses. The results show that, at design conditions, the plant performs with energy and exergy efficiencies of 0.89 and 0.18, respectively. The energy losses are mainly due to the flue gases. The exergy distribution indicates that the combustion and the heat transfer at different temperatures in the burner yield the highest exergy destruction in the process. A parametric study is conducted for the plant under various operational production parameters, including different humidities of the aggregates and filler content in aggregates, working temperatures and ambient conditions, in order to determine the parameters that affect the plant performance. It is shown that the solids humidity has a great impact on energy requirements. A better and sustainable use of the heat source employed in the dryer is proposed to avoid the high irreversibilities found. Furthermore, operating corrections in the mix or in the exhaust gas temperature are proposed to optimize the performance of the plant.

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“…VOCs remaining in the bitumen mass are emitted during storage, transport, and the manufacture of asphalt mixtures. (4) At present, there are few studies on the detailed characteristics of the presence of VOCs in bitumen fumes. Turk et al showed that bituminous materials release VOCs, which are harmful to the environment and to construction workers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Efficiency on the Emissions of Volatile Organic Compounds from Field Asphalt Pavement Mixtures

Long-Sheng¹

2018

Sensors and Materials

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Hot mixed asphalt (HMA) in the paving and rolling phase may release all types of volatile organic compound (VOC) pollutants, but there are few studies on VOC emissions from in situ asphalt pavement mixtures. The purpose of this study was to evaluate the cooling variable effect on in situ new and recycled asphalt pavement (RAP) on VOC emission. Determination of VOCs in samples can be made by a gas chromatography mass spectrometer (GCMS). The results showed that the end temperature of RAP was about 5 ℃ lower than that of a new asphalt mixture during the cooling process. It required a longer amount of time for natural aggregate mixtures to lose heat and thus required more time for the pavement to be closed to traffic. After cooling to about 90-100 °C, the pavement temperature gradient decreased gradually, indicating that the asphalt pavement mixtures' temperatures in the 90-100 °C range gradually reached a steady heat transfer process. In addition, higher temperatures affected the VOC emissions from any reclaimed asphalt mixture. The asphalt mixture continued to cool to below 100 ℃, and the acetone emission concentration gradually decreased. It was indicated that the temperature must be less than 100 ℃ for asphalt pavement mixtures to reduce the risk of harm to human health.

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Airborne Emissions Assessment of Hot Asphalt Mixing Methods and Limitations

Cited by 11 publications

References 14 publications

Performances of a Bitumen Fume and Condensate Generation System for Sampling Method Development

Performances of a Bitumen Fume and Condensate Generation System for Sampling Method Development

Energy and exergy analysis in an asphalt plant’s rotary dryer

Effect of Cooling Efficiency on the Emissions of Volatile Organic Compounds from Field Asphalt Pavement Mixtures

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