  The evolution of mesoscopic structure for cement-water mixtures turning into
colloidal gels remains far from being understood. Recent neutron scattering
investigations (Phys. Rev. Lett. 93, 255704 (2004); Phys. Rev. B. 72, 224208
(2005); Phys. Rev. B. 82, 064203 (2010)),, reveal the role of hydrogen bond in
temporal evolution of the mesoscopic structure during hydration of cement which
is the most consumed synthetic material. The present neutron scattering
investigation on hydration of cement with a mixture of light and heavy water
points to incomprehensibility of the temporal evolution of the mesoscopic
structure in terms of earlier observations on hydration with pure light or
heavy water. Unlike in the case of hydration with light water, disagreement has
been observed with the hypothesis of dynamical scaling for hydration of cement
with a mixture of the two types of water. The dynamics of evolution of the
mesoscopic structure has been observed to be nonlinear in regard to the
composition of hydration medium.
