Cement-based materials are ubiquitous in almost all built environment.In spite of this,little is known about the formation and the role played by the silicate chains always present in the cement nanostructure.By means of first principles simulations we provide compelling evidence on the pivotal role played by certain ionic species in the formation of the silicate chains inside the cementitious matrix.Moreover,we corroborate the experimental evidence which shows that the length of the most stable chains with m Si atoms follows a magic-number sequence:m=3n-l with n=1,2,...Our results have been applied in the development of new higher performance cement-based materials by adding nanosilica.
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