Modification of asphalt by dispersing waste polyethylene and carbon fibers in it

ZHANG Mao-rong; FANG Chang-qing; ZHOU Shi-sheng; CHENG You-liang; HU Jing-bo

doi:10.1016/S1872-5805(16)60022-7

Volume 31 Issue 4

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Article Navigation > New Carbon Mater. > 2016 > 31(4): 424-430

ZHANG Mao-rong, FANG Chang-qing, ZHOU Shi-sheng, CHENG You-liang, HU Jing-bo. Modification of asphalt by dispersing waste polyethylene and carbon fibers in it. New Carbon Mater., 2016, 31(4): 424-430. doi: 10.1016/S1872-5805(16)60022-7

Citation:

ZHANG Mao-rong, FANG Chang-qing, ZHOU Shi-sheng, CHENG You-liang, HU Jing-bo. Modification of asphalt by dispersing waste polyethylene and carbon fibers in it. New Carbon Mater., 2016, 31(4): 424-430. doi: 10.1016/S1872-5805(16)60022-7

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Modification of asphalt by dispersing waste polyethylene and carbon fibers in it

doi: 10.1016/S1872-5805(16)60022-7

1.
School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China;
2.
Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710048, China

Funds: National Natural Science Foundation of China(51172180,51372200);Program for New Century Excellent Talents in University of Ministry of Education of China(NCET-12-1045);Local Service Program of Shaanxi Provincial Education Department(2013JC19);Excellent PhD dissertation Foundation of XAUT(102-211208).

Received Date: 2016-03-19
Accepted Date: 2016-08-29
Rev Recd Date: 2016-07-27
Publish Date: 2016-08-28

Abstract

Abstract

Recycled waste packaging polyethylene (WPE) and chopped polyacrylonitrile-based carbon fibers (PAN-CFs) were dispersed in molten asphalt at 170℃ with a shearing machine at 3 800 r/min for 60 min to modify its properties to meet the demands of motorway paving. WPE and PAN-CFs were mixed by three methods before the dispersion:(a) simple blending, (b) first dissolving WPE in xylene, then mixing and evaporating and (c) blending and extrusion to rods of 1mm diameterat 170℃ which were fed directly into the hot asphalt. The PAN-CF content was varied in the range 0 to 0.12 wt% while the WPE content was constant(4 wt%). Results indicate that WPE and PAN-CFs are dispersed in asphalt to form a network structure by the xylene-assisted mixing or blending-extrusion methods. The softening points, penetration degree and ductility are improved with increasing content of PAN-CFs up to 0.1 wt%. Aggregation of the two modifiers occurs beyond 0.12 wt% of PAN-CFs, which degrades the properties of the modified asphalts. A fiber length of 5 mm is optimum for their best dispersion in the asphalt. Segregation of the modifiers from the modified asphalts can be prevented by increasing the content of PAN-CFs. The blending-extrusion method is best to form a fine network structure, which achieves a best performance. A model is proposed to explain the observed dispersion behavior in asphalt.
- Waste packaging polyethylene,
- Carbon fibers,
- Composite modification,
- Asphalt

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References(22)

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