EFFECT OF COMPLEX ADDITIVE ON CREEP OF FINE-GRAINED CARBONATE CONCRETE
Fine-grained carbonate concretes are a fairly popular material at present, with good indicators for crack resistance, frost resistance, criteria for durability and reliability of building materials and structures. The task of finding the most economically and ecologically justified ways to increase the deformation properties of this concrete is relevant. The article reflects the results of the investigation of deformations of fine-grained carbonate concrete with a complex additive consisting of finely dispersed limestone filler and superplasticizer. Deformations are divided into conditionally instantaneous, short-term and long-term (creep). The study uses a method of planning experiments and special equipment, electric strain gauges for measuring instantaneous deformations and hour-type indicators for measuring creep deformations. It is shown that complex additive contributes to reduction of deformations of fine-grained carbonate concrete and leads to increase of their durability due to modification of structure formation and intensification of hydration process.