ANALYSIS OF PEAT MODIFYING ADDITIVE INFLUENCE ON PROPERTIES OF MINERAL BINDING MATERIALS

• Main Author: O. Misnikov
• Format: Article
• Language: Russian
• Published: Belarusian National Technical University 2013-12-01
• Series: Nauka i Tehnika
• Online Access: https://sat.bntu.by/jour/article/view/210

The paper describes an assessment of peat hydrophobic additive influence on properties of the modified portland cement.  Content of organic and mineral components in the investigated materials has been determined in the paper. An increase of durability of the modified cements is caused by higher dispersion of particles during mixed grinding of clinker and additives. The developed method allows to isolate cement from influence of liquid-drop and vaporous moisture. Isolation is carried out  by means of  binding  solid particles of  a modifier being from several dozens to hundreds of nanometers in size with cement particles, and also due to processes which occur at the nanolevel when  cement is treated by liquid components of hydrophobic modifying additive. Interaction between dispersive cement phase and molecules of organic additive is carried out into practice by hydrogen bonding formation of surface silanol groups of cement particles with oxygen-containing groups of additive. Dispersion non-specific (van der Waals) interaction contributes to adhesion energy of “cement – additive” system.  The paper shows that covalent forces are not formed during additive molecule adsorption on the surface of dispersive cement phase.