. Study of the influence of the super plasticizer of the polycarboxylate type MasterSure HES 1515 on the physicomechanical properties of high-strength concretes

The influence of MasterSure HES 1515 polycarboxylate superplasticizer on the physico-mechanical properties of high-strength concrete was studied. The relationship between the processes of hydration and structuring of cement systems and the content of MasterSure HES 1515 polycarboxylate superplasticizer added to them was established, which made it possible to reveal the regularities of directed regulation of the technological properties of the concrete mixture and the physicomechanical properties of concrete. When using MasterSure HES 1515 polycarboxylate superplasticizer to reduce water consumption of concrete mixtures and the water-cement ratio (W/C), an increase in the compressive strength of hardened concrete is observed, which is the result of compaction of the structure. The increase in compressive strength reaches its greatest value during 2–7 days and to 28 days of hardening it reaches 124.5 MPa. The tensile strength of concrete for this com¬position with the addition of MasterSure HES 1515 (2 mass%) at the early age of hardening is 10.9 MPa, and during 28 days – 14.5 MPa. Thus, the MasterSure HES 1515 polycarboxylate type superplasticizer manifests itself as a hardening intensifier, which is especially important during the manufacture of prestressed structures for transferring the stresses of concrete reinforcement in early periods