Abstract. The influence of the Bauhemi organo-mineral complex on the physical and mechanical properties of slag-containing Portland cements has been investigated. The composition of the organo-mineral complex has been optimized according to the criteria of setting time and strength. It has been shown that the expansion of the beginning of setting and its end is positively influenced by the presence of the plasticizer MC-PowerFlow2695 from 0.4 to 0.8% and the organo-mineral complex CentrilitNC and CentrilitFumeSX in the amount from 3 to 6.5%, which with a simultaneous increase in the slag content from 0 to 30% in the composition of Portland cement, the start / end time of setting increases from 150/190 to 185/250 minutes. It is noted that at the age of 7 days, the introduction of an organomineral complex of the composition MC-PowerFlow2695 from 0.2 to 3.5%, CentrilitNC from 4.5 to 7% and CentrilitFumeSX from 3 to 6.5% contributes to a slight decrease in strength from 3.86/13.95% with a simultaneous increase in the slag content in the composition of Portland cement in the amount of 10 and 30% compared with no additive Portland cement. At the grade age, at the noted concentrations of the Bauhemi organo-mineral complex, the strength of Portland cement with 10% slag increases by 5.4%, and with a slag content of 30%, it decreases by 9.73% compared with no additive Portland cement. Using the method of superposition of response functions, the optimal range of permissible concentrations of the components of the Bauhemi organo-mineral complex, affecting the stated criteria, was determined when the slag content in Portland cement was 10 and 30%, namely: MC-PowerFlow 2695 from 0.28 to 0.5%, CentrilitNC from 4 to 6.8% and CentrilitFumeSX from 3.07 to 6.61%. Further research will be aimed at studying the effect of this complex on the physical and mechanical properties with a slag content of 50 and 70% in the composition of Portland cement.
Effect of carbonation on the hydro-mechanical properties of Portland cements