HARDENING CONCRETE IN STRUCTURES: CHOICE OF THE CONSTRUCTION METHOD BASED ON RESULTS OF THE TEMPERATURE REGIME MODELING IN SPECIAL CONDITIONS

Abstract

Introduction. The paper discusses the use of different methods of the hardening concrete’s temperature regime, depending on the boundary conditions specified in the design and construction of the object. Such conditions include the temperature regime of concrete holding, the turnover rate of the formwork and the construction time of the facility, as well as other factors. The aim of the research is a compilation of the various methods of investigation of the temperature regime of hardening concrete, aimed at providing the required timing of the formwork and technological equipment turnover to ensuring the consumer properties of the structures. The scientific novelty of the research lies in the updating and testing of methods for regulating the hardening concrete’s heating, ensuring the formation of the required consumer structures’ properties not previously used in transport and civil construction and based on preliminary modeling of thermal processes occurring in the hardening concrete through the calculation software. The authors on the example of several large objects’ construction consider the most common situations associated with the selection of construction technology in difficult natural conditions by taking into account the required consumer properties: concreting of large-mass structures in a limited time in the warm season and low-mass structures in winter concreting. The research is relevant in view of the large-scale construction in our country as well as of the facilities’ reconstruction.Materials and methods. The authors carried out the research with the use of modern settlementmeasuring and analytical systems taking into account the change in the thermal stress state of hardening concrete as a function of the temperature change of the concrete mix over time. The use of the modern computational and analytical complex in the physical modeling of the thermo physical processes of hardening concrete made it possible to obtain results as accurately as possible and comparable with observational data obtained during the construction process.Results. The results allowed authors to project the objects’ concreting of erected in various predetermined conditions while observing the required terms of formwork turnover and ensuring the necessary consumer properties.Discussion and conclusions. The authors propose measures, the implementation of which makes it possible to build complex construction projects in a short time in special climatic conditions. The paper is useful for engineering and technical personnel and for professionals involved in the study of thermal processes of hardening concrete.