The influence of technological factors on the properties of fibre cement articles is investigated. The research reveals an interconnection between microstructure and strength of the cement matrix with the average density, moisture deformation and warping of fibre cement sheets.
Portland cement-based mortars, of the standard type used for modern constructions, were modified by adding lyophilized cactus gum, extracted from an indigenous Mexican cactus. The results show an increase in compressive strength as high as 65 % with respect to standard mortars
The investigation results of changes in cement grout observed during the induction and post-induction periods of hardening while adding fine-grinded glass additives are presented. It is assumed that glass introduction decreases pH of the system due to the chemical interaction with alkaline medium of the cement grout. The obtained results are important for the solving of the problem of glass wastes usage in the cement technology.
The work deals with the modification of mortars by small quantities of nanodispersed material. The effect of amorphous nanosilica on Portland cement hydration and hardening has been investigated. The amorphous nanosilica is compared with the known mineral additive – microsilica.
The effect of alkaline component in glass powder on the total alkaline content of cement-glass mixtures, which is limited by standards, has been investigated by means of pH-metry? Titration and different extragents. Using experimental and calculated results concerning alkaline activity of glass powder it is possible to develop chemical structure of the cement composites which would meet the standards in regard to total alkaline content.