Multi-parameter equation of estimation of relative strength of concrete in winter concreting
The article discusses the derivation of a multiparameter equation for estimating the relative strength of concrete under various heat treatment conditions. The article pays special attention to the climatic conditions of the Sakha Republic (Yakutia) and the thermal stress state of concrete hardening in conditions of negative environmental temperature. The article is based on computer interpolation of nomograms of TSN 12-336-2007 «Production of concrete works at negative environmental temperatures in the territory of the Republic of Sakha (Yakutia)». Identified and justified the need to improve the existing method of calculating the relative strength of concrete. The regression equations are obtained by the least squares method using standard statistical and computer analysis methods. The results of statistical processing give the maximum idea of ??the properties of a multiparameter equation, possible combinations of linear and quadratic relationships of factors, which provides a reliable and accurate prediction with a minimum error. Using a multiparameter equation, a nomogram was constructed showing the relationship between the relative strength of concrete and the average temperature and duration of heat treatment. The advantages and disadvantages of calculating the relative strength of concrete by the proposed method are considered. The possibility of using a multiparameter equation in the choice of the optimal schemes for the heat treatment of concrete in the conditions of Siberia and the Far North is substantiated.