Thermal conductivity of bitumen concrete

CôtéJean,; GrosjeanVivien,; KonradJean-Marie,

doi:10.1139/cjce-2012-0159

Cited by 35 publications

(7 citation statements)

References 21 publications

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“…for example, those used with granular construction materials (Côté and Konrad 2005;Côté et al 2013). The methods that have been used so far in the geothermal heat pump sector are described below.…”

Section: Laboratory Methodsmentioning

confidence: 99%

Colloquium 2016: Assessment of subsurface thermal conductivity for geothermal applications

Raymond

2018

Can. Geotech. J.

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The construction of green buildings using geothermal energy requires knowledge of the ground thermal conductivity, assessed when designing the heating and cooling system of commercial buildings with ground-coupled heat pumps. The most commonly used method for active field assessment is the thermal response test (TRT), which consists of circulating heated water in a pilot ground heat exchanger (GHE) where temperature and flow rate are monitored. The transient thermal perturbation is analyzed to evaluate the subsurface thermal conductivity. Heat injection can also be performed with a heating cable in the GHE to conduct a TRT without water circulation, which can be affected by surface temperature variations. Mots-clés : géothermie, géothermique, géophysique thermique, pompe à chaleur, conductivité thermique, test de réponse thermique, échangeur de chaleur au sol.

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Section: Laboratory Methodsmentioning

confidence: 99%

Colloquium 2016: Assessment of subsurface thermal conductivity for geothermal applications

Raymond

2018

Can. Geotech. J.

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“…As a composite material, the thermal properties of asphalt mixture are strongly dependent on the corresponding properties and proportion of each raw material, including asphalt, aggregate, and mineral fillers, as well as the amount of air voids of asphalt concrete [ 28 ]. Difference in thermal properties of these basic materials would affect the thermal properties of conductive asphalt concrete, even with the same content of graphite.…”

Section: Introductionmentioning

confidence: 99%

Effect of Material Composition and Environmental Condition on Thermal Characteristics of Conductive Asphalt Concrete

Pan

et al. 2017

Materials

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Conductive asphalt concrete with high thermal conductivity has been proposed to improve the solar energy collection and snow melting efficiencies of asphalt solar collector (ASC). This paper aims to provide some insight into choosing the basic materials for preparation of conductive asphalt concrete, as well as determining the evolution of thermal characteristics affected by environmental factors. The thermal properties of conductive asphalt concrete were studied by the Thermal Constants Analyzer. Experimental results showed that aggregate and conductive filler have a significant effect on the thermal properties of asphalt concrete, while the effect of asphalt binder was not evident due to its low proportion. Utilization of mineral aggregate and conductive filler with higher thermal conductivity is an efficient method to prepare conductive asphalt concrete. Moreover, change in thermal properties of asphalt concrete under different temperature and moisture conditions should be taken into account to determine the actual thermal properties of asphalt concrete. There was no noticeable difference in thermal properties of asphalt concrete before and after aging. Furthermore, freezing–thawing cycles strongly affect the thermal properties of conductive asphalt concrete, due to volume expansion and bonding degradation.

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“…As mentioned, the MultiCool software used default thermal conductivity values to perform the simulations. However, this property was directly affected by specific conditions of the mixture, such as density (15,16) and temperature (1,15,16), and was not constant throughout the cooling process. Although previous validation studies analyzed general trends only, similar results were reported with temperature underpredictions at the beginning of compaction operations (1, 2), and overpredictions over time (3).…”

Section: Multicool Model Acceptabilitymentioning

confidence: 99%

“…During the mixing process of FCM, the foamed asphalt disperses throughout the aggregate by adhering to the finer particles to form a strong, homogeneous mastic that bonds the larger aggregate particles together (17). Given the rheological characteristics of the asphalt binder, this mastic acts as a thermal bridge between the larger particles and enhances the overall thermal conductivity of FCM (15). Still, FCM is a granular material in nature, and its thermal conductivity remains lower than that of normal AC (18).…”

Section: Fcm Basementioning

confidence: 99%

Influence of Sustainable Recycled Asphalt Technologies on Pavement Construction Cooling Predictions

Sánchez

Timm

2014

Transportation Research Record

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Adequate control of temperatures during compaction is a critical factor in the achievement of proper densification of asphalt concrete (AC) layers. As the mat cools down, the viscosity of the asphalt binder increases; this increased viscosity reduces the compaction capability of the asphalt mixture. To assist paving contractors in their estimation of the cooling rate of asphalt pavements, the MultiCool program uses a heat transfer model that predicts the time window for successful compaction. Although this program has been validated for a variety of hot- and warm-mix asphalt technologies, further validation is needed on additional sustainable asphalt mixture technology. Pavement sections built in 2012 at the National Center for Asphalt Technology Pavement Test Track were used to perform a validation study to assess the effect of sustainable technologies [e.g., reclaimed asphalt pavements, recycled asphalt shingles (RAS), ground tire rubber (GTR) modified binders, and foamed cold-mix (FCM) bases] on the cooling rate of AC and the time available for compaction. Results revealed that the MultiCool model was a fair predictor of the measured temperatures. However, the use of RAS, GTR-modified binders, and a FCM base had a direct effect on the temperature predictions. This effect warrants further investigation of the possible effects of RAS, GTR-modified binders, and FCM base on the thermal properties of asphalt mixtures.

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Thermal conductivity of bitumen concrete

Cited by 35 publications

References 21 publications

Colloquium 2016: Assessment of subsurface thermal conductivity for geothermal applications

Colloquium 2016: Assessment of subsurface thermal conductivity for geothermal applications

Effect of Material Composition and Environmental Condition on Thermal Characteristics of Conductive Asphalt Concrete

Influence of Sustainable Recycled Asphalt Technologies on Pavement Construction Cooling Predictions

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