Novosibirsk State University of Architecture and Civil Engineering, Russian Federation
Professor Valery Rudyak is Honoured Science Worker of Russian Federation. He is head of theoretical mechanics department of the Novosibirsk State University of Architecture and Civil Engineering; simultaneously he is main research scientist of the Siberian Federal University. He is author of 6 monographs and more than 200 papers in reputed journal and he has been serving as an editorial board member of four journals.
Professor Liliya Il’ina has completed his PhD and Doctoral thesises from Novosibirsk State University of Architecture and Civil Engineering. Now she is dean of the Faculty of the ingineering and information thechnologies and professor of the department of building materials. She has published more than 70 papers in journals.
The high mechanical strength of the concrete is the most important property of its application. It is depended on many well studied factors (the water–cement ratio, porosity etc.). It is known that the strength of concrete increases with the addition of microdispersed additives of different chemical composition. However there are very contradictory experimental data about mass fraction of the microdispersed additives to strengthen concrete. In our opinion the possible reason of the such discrepancy of the experimental data may be the different size of microdispersed additives used. The aim of this paper is the experimental study of the effect of the particle size and mass fraction of the different microdispersed additives on the strength of the concrete. The results of mechanical strength tests of fine-grained concrete from the dispersity and the mass fraction of additives, reactive silica fume and inert diopside, are presented. It has been shown that the optimum amount providing greater reinforcement samples decreases with decreasing the dispersity of inert mineral additive. It was found the optimal ratio of silica fume and the diopside to maximize the strength properties of the material. In this case the strength characteristics of the fine-graned concrete has the strength characteristics is 2.5 times higher than the control sample.