Mohamed, Aslam KunhiMoutzouri, PinelopiBerruyer, PierrickWalder, Brennan J.Siramanont, JirawanHarris, MayaNegroni, MattiaGalmarini, Sandra C.Parker, Stephen C.Scrivener, Karen L.Emsley, LyndonBowen, Paul2020-07-162020-07-162020-07-162020-06-2410.1021/jacs.0c02988https://infoscience.epfl.ch/handle/20.500.14299/170158WOS:000543780500023Despite use of blended cements containing significant amounts of aluminum for over 30 years, the structural nature of aluminum in the main hydration product, calcium aluminate silicate hydrate (C-A-S-H), remains elusive. Using first-principles calculations, we predict that aluminum is incorporated into the bridging sites of the linear silicate chains and that at high Ca:Si and H2O ratios, the stable coordination number of aluminum is six. Specifically, we predict that silicate-bridging [AlO2(OH)(4)](5-) complexes are favored, stabilized by hydroxyl ligands and charge balancing calcium ions in the interlayer space. This structure is then confirmed experimentally by one- and two-dimensional dynamic nuclear polarization enhanced Al-27 and Si-29 solid-state NMR experiments. We notably assign a narrow Al-27 NMR signal at 5 ppm to the silicate-bridging [AlO2(OH)(4)](5-) sites and show that this signal correlates to Si-29 NMR signals from silicates in C-A-S-H, conflicting with its conventional assignment to a "third aluminate hydrate" (T ) phase. We therefore conclude that TAH does not exist. This resolves a long-standing dilemma about the location and nature of the six-fold-coordinated aluminum observed by Al-27 NMR in C-A-S-H samples.Chemistry, MultidisciplinaryChemistryc-s-hdynamic nuclear-polarizationenhanced nmr-spectroscopyportland-cementtricalcium silicatequadrupolar nucleinatural-abundanceal-27 nmrsi-29mastext::journal::journal article::research article