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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

Relationship between splitting strength and infrared powder content.
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pone.0133829.g005: Relationship between splitting strength and infrared powder content.

Mentions: The salt concentration of the solution was determined at -10°C, using difference approximation for the freezing point, and was to be 12.6%. Fig 5 shows that the splitting strength gradually increased with the increase in infrared powder content at both 0°C and -10°C temperature conditions. The 0°C low-temperature stability tests show that the splitting tensile strength was increased by 2.6%, 6.2%, and 15.33% when the infrared powder content was 3%, 6%, and 9%, respectively, compared to the value at 0% infrared powder content. When the infrared powder dosage increased to 12%, the highest splitting tensile strength of 2.626 MPa was obtained, an improvement of 21.3%. Hence, it is clear from these results that the incorporation of infrared powder can improve crack resistance of the asphalt mixture at 0°C low-temperature conditions. The results of the splitting test at -10°C show that the splitting tensile strength at infrared powder contents of 3%, 6%, 9%, and 12%, was increased by 24.2%, 30.8%, 41.42%, and 50.1%, respectively, an enhancement of 2.6%, 6.2%, 15.33%, and 21.3%, compared to the values at 0°C. It is clear from these results that the infrared powder improves the performance of the asphalt mixture significantly at low temperatures. From the test results (Fig 5), it can be concluded that the splitting tensile strength of ordinary asphalt material can be improved under both low-temperature conditions (0°C and 10°C) by mixing 7% of infrared powder, thereby increasing the crack resistance of the asphalt pavement.


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

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

Relationship between splitting strength and infrared powder content.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0133829.g005: Relationship between splitting strength and infrared powder content.
Mentions: The salt concentration of the solution was determined at -10°C, using difference approximation for the freezing point, and was to be 12.6%. Fig 5 shows that the splitting strength gradually increased with the increase in infrared powder content at both 0°C and -10°C temperature conditions. The 0°C low-temperature stability tests show that the splitting tensile strength was increased by 2.6%, 6.2%, and 15.33% when the infrared powder content was 3%, 6%, and 9%, respectively, compared to the value at 0% infrared powder content. When the infrared powder dosage increased to 12%, the highest splitting tensile strength of 2.626 MPa was obtained, an improvement of 21.3%. Hence, it is clear from these results that the incorporation of infrared powder can improve crack resistance of the asphalt mixture at 0°C low-temperature conditions. The results of the splitting test at -10°C show that the splitting tensile strength at infrared powder contents of 3%, 6%, 9%, and 12%, was increased by 24.2%, 30.8%, 41.42%, and 50.1%, respectively, an enhancement of 2.6%, 6.2%, 15.33%, and 21.3%, compared to the values at 0°C. It is clear from these results that the infrared powder improves the performance of the asphalt mixture significantly at low temperatures. From the test results (Fig 5), it can be concluded that the splitting tensile strength of ordinary asphalt material can be improved under both low-temperature conditions (0°C and 10°C) by mixing 7% of infrared powder, thereby increasing the crack resistance of the asphalt pavement.

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