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Investigation of Low Heat Accumulation Asphalt Mixture and Its Impact on Urban Heat Environment.

Xie J, Yang Z, Liang L - PLoS ONE (2015)

Bottom Line: The results also revealed that, compared to asphalt with 0% far-infrared radiant content, the asphalt material with a certain ratio of far-infrared radiation material had higher stability at high and low temperatures as well as good water absorption capacity.The Marshall stability of the specimen mixed with 6% far-infrared radiant was higher by 12.2% and had a residual stability of up to 98.9%.The friction coefficient of the asphalt mixtures with 6% and 12% far-infrared radiation material increased by 17.7% and 26.9%, respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China.

ABSTRACT
This study is focused on investigating the effectiveness of low heat accumulation asphalt mixture and its impact on the urban heat environment. Infrared radiation experiments showed that the temperature of the asphalt mixture decreased with the increase in far-infrared radiant material. The results also revealed that, compared to asphalt with 0% far-infrared radiant content, the asphalt material with a certain ratio of far-infrared radiation material had higher stability at high and low temperatures as well as good water absorption capacity. The Marshall stability of the specimen mixed with 6% far-infrared radiant was higher by 12.2% and had a residual stability of up to 98.9%. Moreover, the low-temperature splitting tensile strength of the asphalt mixture with 6% far-infrared radiation material increased by 21.3%. The friction coefficient of the asphalt mixtures with 6% and 12% far-infrared radiation material increased by 17.7% and 26.9%, respectively.

No MeSH data available.


Related in: MedlinePlus

Surface heating and cooling performance of asphalt mixture under different infrared powder content.A. Surface heating temperature; B. Surface equilibrium temperature; and C. Surface cooling temperature.
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pone.0133829.g002: Surface heating and cooling performance of asphalt mixture under different infrared powder content.A. Surface heating temperature; B. Surface equilibrium temperature; and C. Surface cooling temperature.

Mentions: The experimental results showed that, with the increase in irradiation time, the surface temperature of the specimen gradually increased and became more balanced with time (Fig 2A). To ensure accuracy, the specimens were analyzed for 52~61 minutes when the average temperature on the surface of the specimen was at equilibrium temperature. It was found that the equilibrium temperature of the specimen decreases with the increase in infrared powder content (Fig 2B). At 0% infrared powder content, the specimen temperature reached 66.59°C, which is close to the actual temperature of roads during extreme summers. The equilibrium temperature was noted to be 63.71°C, 61.34°C, 59.49°C, and 58.57°C for infrared powder contents of 3%, 6%, 9%, and 12%, respectively. Compare between infrared powder contents of 0% and 12%, the difference of equilibrium temperature was 8.02°C. It is clear from the findings that the far-infrared powder can be incorporated into the asphalt mixture to reduce the temperature of the specimen surface and improve the high-temperature stability of the mixture.


Investigation of Low Heat Accumulation Asphalt Mixture and Its Impact on Urban Heat Environment.

Xie J, Yang Z, Liang L - PLoS ONE (2015)

Surface heating and cooling performance of asphalt mixture under different infrared powder content.A. Surface heating temperature; B. Surface equilibrium temperature; and C. Surface cooling temperature.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519290&req=5

pone.0133829.g002: Surface heating and cooling performance of asphalt mixture under different infrared powder content.A. Surface heating temperature; B. Surface equilibrium temperature; and C. Surface cooling temperature.
Mentions: The experimental results showed that, with the increase in irradiation time, the surface temperature of the specimen gradually increased and became more balanced with time (Fig 2A). To ensure accuracy, the specimens were analyzed for 52~61 minutes when the average temperature on the surface of the specimen was at equilibrium temperature. It was found that the equilibrium temperature of the specimen decreases with the increase in infrared powder content (Fig 2B). At 0% infrared powder content, the specimen temperature reached 66.59°C, which is close to the actual temperature of roads during extreme summers. The equilibrium temperature was noted to be 63.71°C, 61.34°C, 59.49°C, and 58.57°C for infrared powder contents of 3%, 6%, 9%, and 12%, respectively. Compare between infrared powder contents of 0% and 12%, the difference of equilibrium temperature was 8.02°C. It is clear from the findings that the far-infrared powder can be incorporated into the asphalt mixture to reduce the temperature of the specimen surface and improve the high-temperature stability of the mixture.

Bottom Line: The results also revealed that, compared to asphalt with 0% far-infrared radiant content, the asphalt material with a certain ratio of far-infrared radiation material had higher stability at high and low temperatures as well as good water absorption capacity.The Marshall stability of the specimen mixed with 6% far-infrared radiant was higher by 12.2% and had a residual stability of up to 98.9%.The friction coefficient of the asphalt mixtures with 6% and 12% far-infrared radiation material increased by 17.7% and 26.9%, respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China.

ABSTRACT
This study is focused on investigating the effectiveness of low heat accumulation asphalt mixture and its impact on the urban heat environment. Infrared radiation experiments showed that the temperature of the asphalt mixture decreased with the increase in far-infrared radiant material. The results also revealed that, compared to asphalt with 0% far-infrared radiant content, the asphalt material with a certain ratio of far-infrared radiation material had higher stability at high and low temperatures as well as good water absorption capacity. The Marshall stability of the specimen mixed with 6% far-infrared radiant was higher by 12.2% and had a residual stability of up to 98.9%. Moreover, the low-temperature splitting tensile strength of the asphalt mixture with 6% far-infrared radiation material increased by 21.3%. The friction coefficient of the asphalt mixtures with 6% and 12% far-infrared radiation material increased by 17.7% and 26.9%, respectively.

No MeSH data available.


Related in: MedlinePlus