Aging of asphaltic binders investigated with atomic force microscopy

被引：107

作者：

Rebelo, L. M. ^{[1
]}

de Sousa, J. S. ^{[1
]}

Abreu, A. S. ^{[1
]}

Baroni, M. P. M. A. ^{[2
]}

Alencar, A. E. V. ^{[3
]}

Soares, S. A. ^{[3
]}

Mendes Filho, J. ^{[1
]}

Soares, J. B. ^{[4
]}

机构：

[1] Univ Fed Ceara, Dept Fis, BR-60455760 Fortaleza, Ceara, Brazil

[2] Inst Fed Educ Ciencia & Tecnol, BR-01109010 Sao Paulo, Brazil

[3] Univ Fed Ceara, Dept Quim, BR-60455760 Fortaleza, Ceara, Brazil

[4] Univ Fed Ceara, Dept Engn Transporte, BR-60455760 Fortaleza, Ceara, Brazil

来源：

FUEL | 2014年 / 117卷

关键词：

Atomic force microscopy; Aging effects; Asphalt binders; FRACTAL DIMENSION; BITUMEN; MICROSTRUCTURE; AGGREGATION;

D O I：

10.1016/j.fuel.2013.09.018

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

We investigated the short and long term aging of asphalt cement (AC) with different AFM techniques (topography, phase and friction imaging and nano-indentation experiments). The aging process induces a growth and nucleation of the asphaltene micelles with a concomitant reduction of the maltene phase, whereas the short term aging induces the formation of fractal-like micellar structures. The friction investigation shows that the aging processes reduce the binder friction coefficient by 50%, and this reduction occur predominantly during the short term aging, while the growth of the micelles occur predominantly during the long term aging. The micro-indentation experiments revealed that the aging processes cause a stiffening of the AC film (half-order of magnitude for short term aging, and one order of magnitude for long term aging). The aging process also increased the apparent viscosity of the AC films by half-order of magnitude. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：15 / 25

页数：11

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