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TitleDetermining how water is held in composite cement binders
Publication TypeJournal Article
Year of Publication2012
AuthorsMilestone, N.B., and Gorce J.-P.
JournalJournal of the Australian Ceramic Society
Pagination244 - 248
Date Published2012
ISSN0004881X (ISSN)
KeywordsBinders, Bound waters, Calcium silicate, Cement binder, Cementitious binders, Cements, Chlorine compounds, Complex shapes, Composite cements, Conventional techniques, Distribution of water, Free water, Hydration, Hydration reaction, Mechanical properties, NMR relaxometry, Pore waters, Porous networks, Relaxometry, Soluble ions, Supplementary cementing materials
AbstractWater is a necessary component in concrete used extensively for building today's infrastructure. Apart from providing workability, it plays an essential role in the hydration reactions of a cement binder, particularly where supplementary cementing materials are used. With too low a water content, homogeneous mixing of the cement binder and aggregate is difficult and may not provide the workability to effectively fill complex shapes. However, not all water is used in hydration. That left creates a porous network that can reduce strength and allow easy access to soluble ions such as chloride or sulfate leading to metal corrosion or expansion and reduced durability. Determining how much 'free water' is present in a cementitious binder and how it is held is a challenge to the cement chemist. This paper examines the contribution of 1H NMR relaxometry along with more conventional techniques to provide improved understanding of the distribution of water within the pores of the hardened matrix of OPC composite cements.

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