Investigation On Microstructure Of Silica Fume Cement Pastes

Silica fume as a mineral admixture is being used increasingly in the world to produce high performance concrete (HPC). This admixture improves tie properties of concrete, which can be explained by understanding tie changes in the microstructure level. h this study, silica fume cement pastes of water...

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Bibliographic Details
Published in:WIT Transactions on the Built Environment 2002-01, Vol.59
Main Authors: Yajuun, J, Cahyadi, J H
Format: Article
Language:English
Subjects:
Admixtures
Calcium hydroxide
Cement
Cement paste
Concrete
Crystal structure
Crystals
Hydration
Intrusion
Mercury
Microstructure
Morphology
Porosity
Portland cement
Portland cements
Scanning electron microscopy
Silica
Silica fume
Silicon dioxide
Slaked lime
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Summary:Silica fume as a mineral admixture is being used increasingly in the world to produce high performance concrete (HPC). This admixture improves tie properties of concrete, which can be explained by understanding tie changes in the microstructure level. h this study, silica fume cement pastes of water/binder ratio w/b=0.4 were prepared by replacing ordinary Portland cement (OPC) with 5%, l0%, 15% and 20% condensed silica fume (CSF). The pore structures of silica fume cement pastes at curing ages 3, 7, 14, 28, 56 and 90 days were investigated by the mercury intrusion porosimetry (MIP). The morphologies of hydration products were studied by scanning electron microscopy (SEM). The test results indicate that the hydration products of silica fume blended cement paste form a more homogeneous microstructure with less Ca(OH)2 crystals and fmer pore structure comparing with OPC paste
ISSN:1746-4498
1743-3509
DOI:10.2495/HPS020221