Automobile Exhaust–Purifying Performance of Tourmaline-Modified Asphalt Concrete
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 6
Abstract
This study investigated the purifying effect of tourmaline-modified asphalt on automobile exhaust. Six types of tourmaline-modified asphalt concrete were prepared, aiming to achieving excellent exhaust-purifying performance. The purifying effect of tourmaline-modified asphalt slabs on automobile exhaust was emulated indoors through using an exhaust-gas analyzer and a self-made air purifier chamber in the cooling process of the specimens. Then, the influence of laws of the cooling rate of the slabs, dosage of tourmaline, types of tourmaline, and method of tourmaline being added upon the purifying performance were studied systematically. The mechanism of purifying performance of tourmaline-modified asphalt concrete was analyzed through a thermoelectric property test. Finally, the road performance of tourmaline-modified asphalt concrete was evaluated through a relative performance test. The results show that tourmaline-modified asphalt concrete has a good purifying effect on automobile exhaust, especially on (nitrogen oxide compounds), where the maximum purifying rate can reach 93.1%. The purifying effect of tourmaline-modified asphalt concrete on automobile exhaust is improved by the increase of cooling amplitude and dosage of tourmaline. Purification effects of asphalt concrete with tourmaline anion powder on exhaust was improved with an increase in anion emissions; however, the purifying effect of tourmaline-modified asphalt on tends to decline with the increasing fineness of tourmaline. Thermoelectric test results show that the thermoelectric property of tourmaline can still perform well when it is added to asphalt. The high-temperature performance, low-temperature performance, and water-resistance performance of asphalt concrete could be improved clearly by using a tourmaline additive.
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Acknowledgments
This work is partially supported by National Natural Science Foundation of China (51208045), Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2014JM2-5045) and the Special Fund for Basic Scientific Research of Central Colleges (310821162013). This work is also guided by Professor Xuancang Wang of Chang’an University. The authors gratefully acknowledge these sources of financial support.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 13, 2016
Accepted: Sep 13, 2016
Published online: Jan 23, 2017
Published ahead of print: Jan 24, 2017
Published in print: Jun 1, 2017
Discussion open until: Jun 23, 2017
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