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Properties Of Concrete

Biocidal Binders for the Concretes of Unerground Constructions

The developed technology of producing cements with biocidal properties and the results of investigating the physico-mechanical properties of the developed cements, cement pastes, and hardened composites are given. Data on the biostability of composites modified with sodium sulfate, sodium fluoride, and polyhexamethylene stearate are presented. Recommended biocidal binder compositions for manufacturing concretes and other cement composites are given.

Development of Biocidal Cements for Buildings and Structures with Biologically Active Environments

The Limiting Values of Moments And Deformations Ratio in Strength Calculations Using Specified Material Diagrams

In recent years, both Russian and foreign researchers have paid considerable attention to the problem of ensuring the reliability of building structures at all stages of their erection and operation, reconstruction, repair and reorganization. This is due to the growing need to ensure reliable operation of unique, expensive, historically significant structures, which dismantling and replacement are much more expensive than repair or it is impossible generally. Damage to reinforced concrete structures, as a rule, is associated with corrosion, overloading of individual elements and improper operation, design and production errors. In this article, the process of examining the reinforced concrete bearing structure of the building overlap for the possibility of its reconstruction and reorganization is considered in detail, as well as the design calculation based on computer modelling in the LIRA-CAD program.

https://iopscience.iop.org/article/10.1088/1757-899X/463/4/042009/pdf

The Reliability of Building Structures Against Power and Environmental Degradation Effects

Article history: Received 6 March, 2016 Accepted 27 May 2016 Available online 28 May 2016 The article is devoted to some aspects of research of hostile environment influence on the concrete durability. The mechanism of formation of chaotically diversified difficult structure is described. Chemical interactions of cement with active components of diffusion in steam space are examined. Measures for receiving conditions under which the volume of products of reaction will be equal to the volume of the reacted alkaline components of a cement stone are offered. High-quality and quantitative changes in a pore space, which are irrespective of density and the relative molecular mass of reaction products are described. Besides, movement and distribution of gaseous products of reaction in volumes of a cement stone are simulated. Reasonable integrated dependences of influence of aggressive environment on various types of concrete surfaces are given. The methods of corrosion control offered in article allow substantially to lower or absolutely to exclude adverse effect of hostile environment on concrete and reinforced concrete structures already at a stage of selection of composition of concrete mix. In this case service life of concrete and reinforced concrete structures will increase. © 2016 Growing Science Ltd. All rights reserved.

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Changes in the topology of a concrete porous space in interactions with the external medium

1Mordovia N.P. Ogarev State University, 2Nizhegorodskiy N.I. Lobachevskiy State University Bolshevistskaya str. 68, Saransk, 430005. 3Moscow State University of Civil Engineering 129337, Yaroslavl highway, 26 4North Caucasian branch of the federal government’s budget educational institution of higher professional education “Belgorod State Technological University. VG Shukhov Zheleznovodskaya Street 24, Mineralnye Vody, Stavropol Territory, 357202 , Russia

/pdf/bioresistant-building-composites-on-the-basis-of-glass-1re4e61zp7.pdf

Bioresistant Building Composites on the Basis of Glass Wastes

The Energy Integrity Resistance to the Destruction of the Long-term Strength Concrete☆

Article history: Received 6 October, 2016 Accepted 3 February 2017 Available online 6 February 2017 The article discusses the strength of concrete and other brittle materials in the case of nonuniform biaxial type of compression (σ1 > σ2 > 0) and triaxial compression of σ1 > σ2 = σ3 > 0 type (it was assumed that σ> 0 corresponds to compression). It is noted that, when considering the biaxial loading in the accepted model, probabilistic nature of distribution of stresses along the contour of pores and inclusions, i.e. stress causing formation and propagation of cracks in the material, plays an important role. Moreover, the stress across the circuit pores was regarded as a three-dimensional random field of S(α,β,γ,ω),where ω is a random argument. Considering the average number of overshoots NR we believed that the random field of S is not homogeneous (not stationary): its expectation is not constant, but is a function of nonrandom arguments Мs = Мs(α;β;γ). External load, corresponding to NR = const (and at the same time constant of level exceedance probability), first increases and then decreases a little. Heating up to 300оС (573K) and 400оС (673K) leads to violations, and long-term load leads to significant changes in the macroand microstructure of concrete. © 2017 Growing Science Ltd. All rights reserved.

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Vladimir Leonidovich Kurbatov

Papers

Changes in the topology of a concrete porous space in interactions with the external medium

Bioresistant Building Composites on the Basis of Glass Wastes

The Energy Integrity Resistance to the Destruction of the Long-term Strength Concrete☆

The Reliability of Building Structures Against Power and Environmental Degradation Effects

Fracture of high performance materials under multiaxial compression and thermal effect