Fractal Cracking Patterns in Concretes Exposed to Sulfate Attack

被引：13

作者：

Yao, Jinwei ^{[1
,2
]}

Chen, Jiankang ^{[1
]}

Lu, Chunsheng ^{[3
]}

机构：

[1] Ningbo Univ, Sch Mech Engn & Mech, Key Lab Impact & Safety Engn, Ningbo 315211, Zhejiang, Peoples R China

[2] Zhejiang Business Technol Inst, Ningbo 315012, Zhejiang, Peoples R China

[3] Curtin Univ, Sch Civil & Mech Engn, Perth, WA 6845, Australia

来源：

MATERIALS | 2019年 / 12卷 / 14期

基金：

中国国家自然科学基金;

关键词：

concrete; sulfate attack; micro-crack propagation; digital image processing; fractal dimension; DIGITAL IMAGE CORRELATION; ASPHALT MIXTURE; MECHANISM; MORTARS; DAMAGE; MODEL; DURABILITY; SIMULATION; EXPANSION; SURFACES;

D O I：

10.3390/ma12142338

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sulfate attack tests were performed on concrete samples with three water -to -cement ratios, and micro -crack growth patterns on concrete surfaces were recorded. The expansive stress and crack nucleation caused by delayed ettringite formation (DEF) were studied using X-ray diffraction and scanning electron microscopy. By means of a digital image processing technology, fractal dimensions of surface cracking patterns were determined, which monotonously increase during corrosion. Moreover, it is shown that the change of fractal dimensions is directly proportional to accumulation of DEF, and therefore, a simple theoretical model could be proposed to describe the micro -crack evolution in concretes under sulfate attack.

引用

页数：16

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