SPECIFIC USE OF CEMENT IN BENTONITE-POLYMER COMPOSITES
Keywords:
cement, sodium acrylate, bentonite-polymer composites, polymerization, the static shear stress, free swelling capacity.Abstract
The article presents the results of study of use of cement in bentonite-polymer composites. It was found that the cement added to the mixtures for bentonite-polymer composites synthesis exhibits reductive features and together with an oxidizer – ammonium persulphate – creates a redox environment for sodium acrylate polymerization shortening more than soda the period from the start of the reaction to its maximum rate point. The reaction of polymerization of bentonite-polymer composites with cement proceeds in two stages: at the first stage the temperature of samples rises by several degrees, the static shear stress increases by 1,5-2 times and the samples become elastic, at the second stage the temperature continues to rise, the shear stress increases by a factor of hundreds and the samples become more elastic. The large quantity of the chains cross-links is confirmed by low free swelling capacity. The conversion of these composites from the paste-like to rubbery state proceeds at low initial temperatures (10÷14оС), which opens up new possibilities for in situ polymerization of the composites for waterproofing, feeling of cracks and joints, construction of engineered barriers, etc.
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