ABOUT DEPENDENCE OF AERATED CONCRETE STRENGTH PROPERTIES ON ITS COMPONENT COMPOSITION

Abstract

Aerated concrete is a popular building material, which is based on the following ingredients: binder, aggregate, water and void formers. The advantages of this material are its simplicity and reliability in processing and operation. It is also important to note that aerated concrete has good soundproofing and heat-insulating properties. In the interests of the further distribution of this material, there is a need to improve its component composition. The aim of this work was to identify the relationship between the strength of aerated concrete and its component composition using a mathematical model. The following tasks were set: on the basis of experiments to determine the strength of aerated concrete samples; using a multiple regression model, derive the dependence of the strength of aerated concrete on its component composition; to prove the adequacy of the analytical relationship between the strength of aerated concrete and its component composition; to carry out calculations proving the reliability of the obtained mathematical model and applicability for predicting the properties of aerated concrete depending on the composition of the formulation. In the course of the work, the physicomechanical properties of laboratory samples of aerated concrete of various component compositions were determined by compression on a hydraulic press. All tests were carried out in accordance with the Building Codes 277-80 and State Standard 10180-2012. Eight strength tests of the samples were performed. The relationship between the quantitative composition of the mixture and its strength was determined using a multivariate regression model. As a result of the work, a correlation-regression model of the relationship of strength characteristics and component composition of aerated concrete was built. The adequacy of the obtained model and its parameters was also proved; the applicability of this dependence to the assessment of the physical and mechanical properties of the studied object was shown.