The influence of cement source and slag additions on the bleeding of concrete
| Autor: | H Ait-Aider, P.J Wainwright |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Cement
Excessive Bleeding Materials science Settlement (structural) technology industry and agriculture Slag Building and Construction law.invention Portland cement Compressive strength law Ground granulated blast-furnace slag visual_art visual_art.visual_art_medium Slab General Materials Science Composite material |
| Zdroj: | Cement and Concrete Research. 25:1445-1456 |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/0008-8846(95)00139-4 |
| Popis: | Excessive bleeding of plastic concrete can result in problems with finishing and a weak surface layer particularly on flat slabs, a reduction in the bond between the steel and the concrete and an increased risk of the occurrence of plastic settlement cracks. Bleeding is controlled primarily by the fine material in the mix in particular, the quantity and reactivity of the cement. The partial replacement of OPC by ground granulated blastfurnace slab(ggbs) leads to a reduction in the rate of hydration and as most other workers have reported, an increase in bleeding. However the authors have found that if comparisons are made on the basis of an equal 28 day compressive strength, and not on equal water/cement ratio as is usually the case, there are little if any differences between the OPC and the slag cement concretes. The reason for this is believed to be due to the increase in the overall cement content of the slag cement concretes which is necessary inorder to achieve parity in strength at 28 days with the OPC concretes. Tests were also performed using Portland cement from different sources, the property of the cement having the most influence on bleeding was the particle size distribution. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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