Analysis of the Influence of Loading Time And Technological Factors on the Deformation of Long-Term Creep of Lightweight Concretes

Abstract

The article analyzes the developmental patterns of linear and nonlinear creep deformations in lightweight prestressed ceramic concrete structures under prolonged compression. The joint influence of the water-cement ratio, temperature effects up to 900C, and the stiffness of the porous filler on the kinetics of stress redistribution in the concrete structure was investigated. The mathematical dependence for determining the nonlinear creep of keramzit concrete was considered, taking into account the time factor and the age of the concrete at the time of loading (t1>16 days). It has been established that the linear creep limit of high-strength lightweight concretes reaches 65% of the compressive strength, which is significantly higher than the indicators of conventional concretes. The obtained results and refined empirical formulas significantly increase the accuracy of calculating the deflections and load-bearing capacity of bending and eccentrically compressed elements of transport structures