Influence of different sizes of concrete and roller compacted concrete on double-K fracture parameters
Affected by physical properties of various components, characteristics and stress states of junction surface and other multiple factors, concrete, as a kind of multi-phase composite material, has complicated failure mechanism, thus making its fracture mechanism research difficult. But concrete has...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2016-02-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero33/numero_35_art_56.pdf5 |
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| Summary: | Affected by physical properties of various components, characteristics and stress states of junction
surface and other multiple factors, concrete, as a kind of multi-phase composite material, has complicated
failure mechanism, thus making its fracture mechanism research difficult. But concrete has been widely used in
engineering construction, so research on concrete fracture theory is of important realistic significance and
construction value. This study discusses influence rule of specimen size and crack-depth ratio (α0/h) on double-
K fracture parameters (initial fracture toughness ini
IC K and unstable fracture toughness un
IC K ) and its size effects by
using fracture test. Different sizes of concretes and roller compacted concrete (RCC) specimens are adopted to
explore influence of specimen size on concrete double-K fracture parameters. Results reveal that initial fracture
toughness ini
IC K and unstable fracture toughness un
IC K increase as specimen size enlarges, showing a size effect;
besides, subcritical crack extends with the increase of specimen size. With regard to specimens with different
crack-depth ratios, its unstable fracture toughness un
IC K is unrelated to initial crack-depth ratio when crack-depth
ratio is more than or equal to 0.4, while initial fracture toughness ini
IC K is correlated with initial crack-depth ratio,
which indicate that double-K fracture parameters can be considered as material constants describing concrete
initial fracture, stable expansion and whole process of stability failure. |
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| ISSN: | 1971-8993 1971-8993 |