In the article results of use of experimental-statistical models "modifying additives, dispersible fibers – property" for study of physico-mechanical characteristics of modified fiber-reinforced fine-grained concretes are shown. Advantages of application of the models in this class are displayed. 7 triangular Gibbs-Roseboom’s diagrams fixed in 7 points of bearing triangle with the isolines of maximums of the investigated properties, built with the use of the program Statistica 10.0.1011, and graphic dependences of its are given.

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