Filled Binder for the Water-Glass Based Radiation-Protective Composites
The volumetric rate of filler affects the type and structure of chemical products emerging during the hardening process of binders and composites based on barium hydrosilicates. It is shown that by means of using the inert filler it is possible to change the composition of the hardened material. In particular, instead of BaO·2SiO2·4Н2О formation, the formation of Ba5[Si4O12](OH)2 can occur. This is due to steric effects and extra amount of the barium cations near the particles of fine filler. It is revealed also that the increase of the filling rate leads to the formation of crystal form of barium hydrosilicates. Such hydrosilicates are characterized by increased interfacial distance. These phenomena prove the presence of the steric effects. However, the chemical reaction of binder (water glass) with hardener (barium chloride) proceeds completely to the end. Thus, neither barium chloride nor sodium hydrosilicates are present in hardened composite. Because of this, disperse filled binders based on barium hydrosilicates (products of reaction between water glass and barium chloride) can be considered as a promising component for effective composites intended for protection from gamma-and neutron radiation.
E. V. Korolev and A. N. Grishina, "Filled Binder for the Water-Glass Based Radiation-Protective Composites", Advanced Materials Research, Vol. 746, pp. 281-284, 2013