Some questions of the technology of concreting massive foundation slabs using self-compacting concrete mixtures
Abstract
Some questions of the technology of concreting massive foundation slabs using self-compacting concrete mixtures
Incoming article date: 12.07.2022Numerous factors that determine the quality of monolithic reinforced concrete massive foundations predetermine the relevance of a thorough study of a set of issues related to the intensity of concreting, the technical capabilities of the contractor, temperature and humidity conditions, the characteristics of the technological properties of the concrete mixture and the kinetics of concrete hardening. To ensure the solidity of the structure, the expediency of determining the thickness of the layer to be laid is justified not only by the length of the working part of the vibrator, as prescribed by the standards, but also by the indicators of the intensity of concreting, determined by the design parameters, temperature and humidity conditions and the capabilities of the worker. The influence of the temperature and humidity conditions of the environment and the recipe features of the concrete mixture on the rational time of overlapping layers is shown. The results of modeling the level of tensile stresses on such recipe-technological factors as the class and kinetics of concrete hardening, temperature conditions and conditions of heat exchange with the environment are given on the example of a temperature-shrinkage block 20x20x2 m. the values of its parameters. An equation is given for relative moisture loss over the thickness of the structure in dry hot weather when self-compacting concrete mixtures are used.
Keywords: intensity of concreting, quality of massive monolithic foundations, overlapping time of layers, moisture loss, level of tensile stresses