Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5436914 | Cement and Concrete Composites | 2017 | 29 Pages |
Abstract
The effect of limestone on the hydration and microstructural development of ultra high performance concrete (UHPC) with different levels of replacement (34%, 54% and 74% by volume) was investigated. Up to 54% replacement of cement by limestone the mixes showed better workability and higher compressive strength (170Â MPa at 56 days for 54% addition) compared to a classical mix (155Â MPa) with no limestone replacement. The kinetics of hydration were compared for different replacement levels using isothermal calorimetry. The phase development was quantified by X-ray diffraction with Rietveld method combined with thermal gravimetric analysis. The pore structure was examined by mercury intrusion porosimetry. The composition of hydration products was determined by scanning electron microscopy with energy dispersive X-ray analysis. The results showed that the hydration degree of the cement is increased from 39% for classical UHPC to 66% for the UHPC with 54% of limestone.
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Authors
Wei Huang, Hadi Kazemi-Kamyab, Wei Sun, Karen Scrivener,