Early shrinkage cracking of cementitious materials based on the eccentric ring method
| Autor: | Cong Tian, Xiaosheng Wei |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Cement
Materials science 0211 other engineering and technologies Shrinkage cracking Humidity 020101 civil engineering 02 engineering and technology Building and Construction 0201 civil engineering Strain energy Cracking 021105 building & construction Eccentric General Materials Science Cementitious Composite material Curing (chemistry) Civil and Structural Engineering |
| Zdroj: | Construction and Building Materials. 216:599-611 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2019.05.014 |
| Popis: | The ring method is a commonly used and effective means of studying concrete cracking problems. However, this method also has disadvantages, such as the appearance of cracks being random. In order to determine the cracking time, cracking position and cracking mechanism of the concrete in an early stage, the eccentric ring approach was used to study the early cracking of cement-based materials. The water-cement ratios were 0.25, 0.30, 0.35, 0.4 and the aggregate volume content 10%, 30%, 50%, respectively. The results show that the cracking time will increase with increase of the water-cement ratio or the aggregate volume content, and there will always be a single complete-through crack in the pure cement paste sample. With further increase of the water-cement ratio, aggregate volume and curing humidity, there will be up to six fine and undeveloped cracks appearing symmetrically, from the thin side to the thick side. The distribution of the cracks has a certain regularity and the corresponding specific angle range is 10°−30°, 80°−110°, 150°−170°. Theoretically, the cracking mechanism is investigated from three aspects: stress, strain and strain energy. The analytical results of ANSYS can be used to explain the specificity of the cracking position to some extent. |
| Databáze: | OpenAIRE |
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