Crack growth mechanisms in four different concretes: Microscopic observations and fractal analysis

被引：92

作者：

Chiaia, B

van Mier, JGM ^{[1
]}

Vervuurt, A

机构：

[1] Delft Univ Technol, Fac Civil Engn, NL-2600 GA Delft, Netherlands

[2] Politecn Torino, Dept Struct Engn, Turin, Italy

来源：

CEMENT AND CONCRETE RESEARCH | 1998年 / 28卷 / 01期

关键词：

D O I：

10.1016/S0008-8846(97)00221-4

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Splitting tests have been carried out for evaluating damage in four types of concrete. The concretes contained either river gravel with maximum aggregate size equal to 2 and 16 mm, phosphorous-slag aggregates, and Lytag aggregates. Different failure behaviours have been revealed, mainly depending on the aggregate and interface characteristics. The microscopic cracking mechanisms strongly affect strength, toughness, and ductility. In addition to mechanical measurements, a high resolution optical microscope was adopted for detecting the crack growth. Fractal dimensions of the crack lips and of the complex damage patterns were computed. No simple relation exists between fracture energy and fractal dimension, but relative differences in the material structure affect the value of the fractal dimension. This confirmed the peculiar different behaviours encountered in the tests. (C) 1998 Elsevier Science Ltd.

引用

页码：103 / 114

页数：12

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