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      Shear deformations in calcium silicate hydrates

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      Soft Matter

      Royal Society of Chemistry (RSC)

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          A second-generation reactive empirical bond order (REBO) potential energy expression for hydrocarbons

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            ReaxFF:  A Reactive Force Field for Hydrocarbons

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              Composition and density of nanoscale calcium-silicate-hydrate in cement.

              Although Portland cement concrete is the world's most widely used manufactured material, basic questions persist regarding its internal structure and water content, and their effect on concrete behaviour. Here, for the first time without recourse to drying methods, we measure the composition and solid density of the principal binding reaction product of cement hydration, calcium-silicate-hydrate (C-S-H) gel, one of the most complex of all gels. We also quantify a nanoscale calcium hydroxide phase that coexists with C-S-H gel. By combining small-angle neutron and X-ray scattering data, and by exploiting the hydrogen/deuterium neutron isotope effect both in water and methanol, we determine the mean formula and mass density of the nanoscale C-S-H gel particles in hydrating cement. We show that the formula, (CaO)1.7(SiO2)(H2O)1.80, and density, 2.604 Mg m(-3), differ from previous values for C-S-H gel, associated with specific drying conditions. Whereas previous studies have classified water within C-S-H gel by how tightly it is bound, in this study we classify water by its location-with implications for defining the chemically active (C-S-H) surface area within cement, and for predicting concrete properties.
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                Author and article information

                Journal
                SMOABF
                Soft Matter
                Soft Matter
                Royal Society of Chemistry (RSC)
                1744-683X
                1744-6848
                2013
                2013
                : 9
                : 30
                : 7333
                Article
                10.1039/c3sm50442e
                © 2013
                Product
                Self URI (article page): http://xlink.rsc.org/?DOI=c3sm50442e

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