Investigation of hydration products formation at early ages

Title: Investigation of hydration products formation at early ages
Author(s): A.U. Ozturk, B. Baradan
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 233 - 241
Total Pages: 9
Nb references: 9
Language: English

Abstract: In this study, hydration development of cement mortars has been investigated to simulate the development of hydration products formation at early ages. Cement mortars were prepared by adding naphthalene sulphonate based (NSB) admixture having a retardation effects on cement hydration by different ratios. Microstructural investigation has been made on each cement mortar to characterize the microstructural development of hydration process.
Micrographs have been taken under scanning electron microscope (SEM) at early ages such as 1, 2 and 7 days in which naphthalene sulphonate based admixture has the retardation effect more effectively.
The area ratio values of each hydration product phase such as undifferentiated hydrates, unhydrated parts, calcium hydroxide ( Ca(OH)2 ) and pore structure in cement mortar prepared with ordinary Portland cement (OPC) and naphthalene sulphonate based admixture were determined by image analysis. These area ratio values developments with time were plotted for each phase. The study indicates that admixture retards formation of undifferentiated hydrates and, results as an increase in pore area ratio values at early ages.
Therefore, the area ratio values of calcium hydroxide part increases as the area ratio values of unhydrated part decrease with time.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00

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