Quantitative comparison of chipping- and hydrodemolition-induced microscopic damage evolution in concrete substrates
| Autor: | Izumi Tanikura, Yuzo Obara, Atsushi Sainoki, Shinya Watanabe, Ren Shintani |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
medicine.diagnostic_test 0211 other engineering and technologies 020101 civil engineering Computed tomography 02 engineering and technology Building and Construction Bending 0201 civil engineering Hydrodemolition Substrate (building) Flexural strength 021105 building & construction medicine Fracture (geology) General Materials Science Composite material Porosity Layer (electronics) Civil and Structural Engineering |
| Zdroj: | Construction and Building Materials. 164:193-205 |
| ISSN: | 0950-0618 |
| Popis: | The present study quantitatively evaluates the severity of chipping- and hydrodemolition-induced damage in concrete substrates. The concrete substrate layer was removed with a pneumatic breaker (BR) or a waterjet (WJ). The X-ray computed tomography (CT) method was used to microscopically investigate the porosity, crack width and its connectivity in the concrete substrates. This analysis indicates that damage depth was significantly greater in the concrete samples prepared with the BR, compared with the WJ. After this analysis was completed, additional concrete material was placed on these surfaces with these different preparation methods. Subsequently, concrete bending tests were performed on sample cores obtained from these prepared concrete blocks. From these tests, the flexural strength and fracture surface location were examined. Combining the above-mentioned results, it is concluded that concrete chipping and removal with the BR can severely damage the concrete substrate contrasted with the WJ, thus resulting in a decrease in its flexural strength. |
| Databáze: | OpenAIRE |
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