Development of nanomodifiedrapid hardening fiber-reinforced concretes for special-purpose facilities

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.127001

Keywords:

nanomodification, dispersed reinforcement, organo-mineral additive, rapid-hardening concrete, deformation properties, high-velocity impact

Abstract

Experimental studies confirmed that the development of rapid-hardening concretes with high resistance to a high-velocity impact for special-purpose facilities is achieved through the multilevel modification of the structure. The introduction of dispersed fibers ensures optimization of a structure at the macro- and mesolevel. At the micro- and nano-leves ‒ by energetically active ultra- and nanofine mineral additives and a high-reducing polycarboxylate superplasticizer. We established high efficiency of the influence of an organo-mineral nanomodifier containing polycarboxylate superplasticizer, micro- and nano-silica on the workability of the concrete mixture and the kinetics of concrete hardening based on it. We detected a directional formation of the structure and the preset properties of concretes of highly flowing mixtures at both early and late stages of hardening. We established that the early strength of nanomodified concretes increases by 4.8‒5.1 times, and strength after 28 days ‒ by 2.0‒2.3 times. The study showed that an increase in the number of contacts, reduction in size and the number of initial defects and increasing the homogeneity of nanomodified concrete leads to the creation of a dense, fine-porous, less defective structure. Ensuring such a structure of nanomodified fiber-reinforced concretes leads to an increase in deformation characteristics, specifically stiffness and elasticity, which make it possible to withstand greater stresses at a constant value of relative deformations. We carried out tests on resistance of nanomodified fiber-reinforced concretes under conditions of action of a high-velocity impact that indicate their increased impact viscosity. Thus, we can argue about the relevance of a mechanism for the formation of regulated properties of nanomodified fiber-reinforced concretes and about practical attractiveness of the proposed technological solutions.

Author Biographies

Uliana Marushchak, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

PhD, Associate Professor

Department of Building Production

Myroslav Sanytsky, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

Doctor of Technical Sciences, Professor, Head of Department

Department of Building Production

Sergiy Korolko, Hetman Petro Sahaidachnyi National Army Academy Heroiv Maidanu str., 32, Lviv, Ukraine, 79012

PhD, Associate Professor

Department of Electromechanics and Electronics

Yuriy Shabatura, Hetman Petro Sahaidachnyi National Army Academy Heroiv Maidanu str., 32, Lviv, Ukraine, 79012

Doctor of Technical Sciences, Professor, Head of Department

Department of Electromechanics and Electronics

Nazar Sydor, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

Postgraduate student

Department of Building Production

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Published

2018-03-27

How to Cite

Marushchak, U., Sanytsky, M., Korolko, S., Shabatura, Y., & Sydor, N. (2018). Development of nanomodifiedrapid hardening fiber-reinforced concretes for special-purpose facilities. Eastern-European Journal of Enterprise Technologies, 2(6 (92), 34–41. https://doi.org/10.15587/1729-4061.2018.127001

Issue

Vol. 2 No. 6 (92) (2018): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2018 Uliana Marushchak, Myroslav Sanytsky, Sergiy Korolko, Yuriy Shabatura, Nazar Sydor

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