Limits...
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 optimum asphalt aggregate ratio and infrared powder content.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4519290&req=5

pone.0133829.g001: Relationship between optimum asphalt aggregate ratio and infrared powder content.

Mentions: The equipment used in the study included an automatic screening instrument, controllable oven, electric compactor, stability tester, rutting tester, and incubator. The physical properties were analyzed by various tests such as coarse aggregate test, infrared emissions rate test, and cooling performance test. Mix design experiments were carried out, in accordance with JTJ 052–2000 Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering [17] and the Marshall test, to determine the aggregate gradation, fiber content, density, and optimal ratio of whetstone. Fig 1 shows the actual asphalt aggregate ratios, from the whetstone test, and the fitted asphalt aggregate ratios for different infrared powder contents. The optimum asphalt mixture ratio shows a linearly increasing trend with the infrared powder content; hence, a straight line could be fitted to the curve of optimum asphalt ratio (y) and infrared powder content (x), represented by Eq 1. The calculated correlation coefficient was 0.9998, which shows the effectiveness of the infrared mix material.


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 optimum asphalt aggregate ratio and infrared powder content.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0133829.g001: Relationship between optimum asphalt aggregate ratio and infrared powder content.
Mentions: The equipment used in the study included an automatic screening instrument, controllable oven, electric compactor, stability tester, rutting tester, and incubator. The physical properties were analyzed by various tests such as coarse aggregate test, infrared emissions rate test, and cooling performance test. Mix design experiments were carried out, in accordance with JTJ 052–2000 Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering [17] and the Marshall test, to determine the aggregate gradation, fiber content, density, and optimal ratio of whetstone. Fig 1 shows the actual asphalt aggregate ratios, from the whetstone test, and the fitted asphalt aggregate ratios for different infrared powder contents. The optimum asphalt mixture ratio shows a linearly increasing trend with the infrared powder content; hence, a straight line could be fitted to the curve of optimum asphalt ratio (y) and infrared powder content (x), represented by Eq 1. The calculated correlation coefficient was 0.9998, which shows the effectiveness of the infrared mix material.

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