Investigation of the structure of cement stone, obtaining and optimization of high-strength concrete on mechanically activated binder

¹ Odesa State Academy of Civil Engineering and Architecture, Didrihsona St. 4, 65029 Odesa, Ukraine
² Lutsk National Technical University, Lvivska St. 75, 43018 Lutsk, Ukraine
³ Lesya Ukrainka Eastern European National University, Volya Avenue 13, 43025 Lutsk, Ukraine

^* Corresponding author: sergii.synii@gmail.com

Abstract

Physico-chemical methods of the study of hydrated cement by mechanically activated binding substance with organo-mineral additive (microsilica + C-3) were presented. It was explored the influence of the additive into the kinetics of formation lowly-basic calcium hydrosilicate. The experiment conducted in accordance with a three-factorial D-optimum plan enabled to establish an influence of blending and technological factors (x₁ – content of microsilica in the binder - 5±5%; x₂ – binder consumption in concrete - 450±100 kg/m³; x₃ – specific area (S_sp) of Portland cement 400±100 m²/kg) on physical and mechanical properties of concrete (compression strength, water absorption). It was established that the use of the mechanically activated blended Portland cement of general purpose with an organomineral additive (microsilica+C-3) makes it possible to obtain high-strength concretes which compression strength on the 28^th day reaches 120 MPa. Optimization of concrete mixes was achieved on the basis of obtained mathematical models that reflect the influence of blending and technological factors on physical and mechanical properties of a high-strength concrete.