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《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:

2018年03期

Page:

11-18

Research Field:

道路与铁道工程

Publishing date:

Info

Title:

Induction heating activated self-healing of cracks in SBS modified asphalt concrete adding steel grits

Author(s):

HE Liang¹;  LI Guan-nan¹;  XIONG Han-jiang¹;  LIU Quan-tao²;  GAO Jie¹; 3;  HUANG Hai-lin¹

1. National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China; 2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, Hubei, China; 3. Department of Civil Engineering, Liverpool John Moores University, Liverpool L3 3AF, Merseyside, UK

Keywords:

pavement material;  SBS modified asphalt concrete;  steel grit;  eletromagnetic induction heating;  crack self-healing property Author resume: HE Liang(1983-);  male;  associate professor;  PhD;  heliangf1@163.com.

PACS:

U416.217

DOI:

-

Abstract:

SBS modified asphalt concrete beam specimens added steel grits with pre-cut were prepared, an electromagnetic induction heating experiment was carried out, the influences of heating distance, particle size and content(volume fraction)of steel grit on the crack self-healing property and road performance of SBS modified asphalt concrete were analyzed, and the corresponding suggestions on how to use such conductive materials were proposed. Research result shows that the smaller the heating distance is, the greater the induction heating rate is. When the induction coil is 10 mm away from the top of beam specimen, the specimen has higher heating rate and the infrared camera can capture the images easily. The steel grits are easily dispersed during the concrete preparation. The larger the size and content of steel grit are, the greater the average induction heating rate is. The top surface of the specimen has the largest average induction heating rate that reaches 1.25 ℃·s^-1 when the volume fraction and particle size of steel grit are 6% and 1.4 mm, respectively. With the content increase of steel grit, the induction heating self-healing rate of the specimen gradually increases. The average self-healing rate can reach 89.2% when the maximum temperature of top surface of the specimen is 80 ℃. At the same time, the largest self-healing rate of the specimen is 96.2% when the content and particle size of steel grit are 6% and 1.0 mm, respectively. Steel grits improve the high-temperature stability of SBS modified asphalt concrete, but affect the low-temperature crack resistance. When the content and particle size of steel grit are 6% and 1.0 mm, respectively, the dynamic stability of the specimen is 6 813 times·mm^-1, the residual strength ratio of freezing-thawing cleavage is 93.18%, the inundation Marshall residual intensity ratio is 93.88%, and the low-temperature bending strain only decreases to 3.155×10^-3 that still meets the demand(≥3.0×10^-3)of Technical Specification for Construction of Highway Asphalt Pavements(JTG F40—2004). Therefore, the SBS modified asphalt concrete may be used for induction heating self-healing pavement when the content and particle size of steel grit are 6% and 1.0 mm, respectively. 1 tab, 13 figs, 22 refs.

References:

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Last Update: 2018-07-14