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Quantitative evaluation of interfacial adhesion between cement emulsified asphalt mastic and RAP(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2016年05期
Page:
16-21
Research Field:
道路工程
Publishing date:

Info

Title:
Quantitative evaluation of interfacial adhesion between cement emulsified asphalt mastic and RAP
Author(s):
WANG Zhen-jun;  AN Deng-deng1;  LIU Liang;  WANG Hong-fei;  ZHANG Qian
1. School of Materials Science and Engineering, Chang‘’an University, Xi‘’an 710061, Shaanxi, China;2. Zhejiang Scientific Research Institute of Transport, Hangzhou 311305, Zhejiang, China
Keywords:
road engineering;  reclaimed asphalt pavement (RAP);  cement emulsified asphalt mastic;  interfacial adhesion;  quantitative evaluation
PACS:
U411
DOI:
-
Abstract:
Cement emulsified asphalt mastic was easy to peel from the interface between mastic and reclaimed asphalt pavement (RAP) after soaking and the interfacial adhesion was not uniform in the cold reclaimed emulsified asphalt mixtures, which directly influenced the properties of the mixtures, such as water stability. Interfacial adhesion degree was usually evaluated by qualitative methods at home and abroad and easilyoperated and accuratelyquantified technique was desired. In this paper, HCl solution was used to erode the lamella of the cement emulsified asphalt mastic according to a simulation test. The digital image processing technology was adopted to get the twodimension shape features of RAP. The calculation model of RAP surface area was put forward. The coating ability test was designed between different shape factors of RAP and cement emulsified asphalt mastic; and the coating interface was eroded with HCl. HCl erosion resistance and adhesion uniformity of mastic layer were expressed by the release of Ca2+and Mg2+within 20 minutes. The results show that the HCl has erosion characteristics for cement emulsified asphalt mastic and it can corrode cement hydrates. Aggregate shape factor has little influence on the average film thickness of cement emulsified asphalt mastic. The larger the RAP shape factor, the greater the ratio of ion release quantity to adhesion amount, the worse HCl erosion ability, the inferior the adhesion uniformity and adhesive grade. The larger the RAP shape factor, the weaker interfacial adhesion of cement emulsified asphalt mastic. Ion release quantity first increases and then decreases with the increase of C/EA. However, the adhesion ability first decreases and then increases. There exists the lowest ion release quantity and the best interfacial adhesion degree when C/EA reaches 30%.

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Last Update: 2016-10-04