The influence of bleeding, extra water and superplasticizer on the SCC plastic shrinkage cracking: case of hot weather
| Autor: | Hacène Ait Aider, Salima Aggoun, Hacène Houari, Ishaq Yakoubi |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
0211 other engineering and technologies Superplasticizer Shrinkage cracking 020101 civil engineering 02 engineering and technology Surfaces and Interfaces General Chemistry 0201 civil engineering Surfaces Coatings and Films Cracking Hot weather Mechanics of Materials 021105 building & construction Materials Chemistry Geotechnical engineering Mortar Composite material Shrinkage |
| Zdroj: | Journal of Adhesion Science and Technology. 30:2596-2618 |
| ISSN: | 1568-5616 0169-4243 |
| Popis: | Self-compacting concrete (SCC) is a new material able to be put in place without vibration. However, this advantage is offset by some drawbacks, such as plastic shrinkage, one of the causes of cracking in concrete. Furthermore, the presence of fines absorbs a large amount of water and therefore minimizes bleeding. This paper endeavours to provide a better understanding of the appearance of plastic shrinkage cracking, and to justify his relation with bleeding phenomena. Five SCC formulas with different W/C ratios were prepared and compared to the same range of ordinary concrete (OC) in terms of restrained shrinkage (cracking width). At the same time, a study of cracks’ propagation over time (cracking length) was conducted on the equivalent mortars (mOCe, mSCCe). Mixtures were placed in different hot environmental conditions. The results showed that bleeding significantly reduces cracking length and has no effect on cracking width. In the second part, extra water and superplasticizer was proposed as... |
| Databáze: | OpenAIRE |
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