Abstract
The effectiveness of the action of anion-active superplasticizers in mineral suspensions based on powders with different electrical surface properties has been studied. It is shown that in suspensions with positively charged particles (marble) the best thinning effect is observed. At the same time, in suspensions based on powdered quartz with a predominantly negative sign of the particle surface charge, the effectiveness of the action of superplasticizers is significantly reduced. It has been established that it is possible to increase significantly the diluting ability of anionic modifiers (by 40-68%) in quartz suspensions by introducing calcium carbonate (5%) during their joint grinding. The increase in liquefaction is due to the fact that blocking of negatively charged active centers of quartz sand is observed during joint grinding with CaCO3. It is shown that the electrosurface properties of the powdered filler have a secondary effect on the liquefaction of the cement paste with a filler composition of 1:1, since hydroaluminate particles with a positive surface charge have a predominant effect on the liquefaction. The electrical surface properties of the filler significantly affect the stability of the diluting ability of the joint venture over time due to heterocoagulation reactions with charged particles of the hydrated phases of Portland cement. It is shown that the strength of powder concretes with 10 and 30% fillers depended on the type of material used.
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