DESIGN OF FIBER-REINFORCED CONCRETE COMPOSITIONS USING EXPERIMENTAL-STATISTICAL MODELS

Abstract

The article is devoted to the development of a methodology for designing the composition of fine-grained fiber reinforced concrete with hybrid dispersed reinforcement. Hybrid dispersed reinforcement includes the use of steel and basalt fiber. As a result of the experiments which were carried out, a complex of experimental and statistical models of strength properties and consumption of superplasticizer for this type of concrete was obtained. A nomogram of the properties of hybrid fiber reinforced concrete was constructed, which allows determining the quantitative values of the concrete composition parameters. A methodology for designing the composition of hybrid fiber reinforced concrete is proposed, which includes the use of a nomogram and obtained experimental-statistical models. The method allows consistently finding consumption of both types of fiber, water-cement ratio and cement consumption based on the required value of flexural tensile strength. Further, on the basis of known dependencies, the rest of the mixture components are determined. Using of an experimental-statistical model, the  superplasticizer content is established, which ensures the necessary concrete mix workability, is determined. An example of designing the composition of hybrid fiber reinforced concrete is given, in which the values of the content of all components are calculated step by step.