14 Result(s)
within
S. N. Leonovich
Industrial Chemistry/Chemical Engineering
Thermodynamics
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Article
Nanogranular Nature of CSH: Experimental Confirmation by Nanoindentation
Hydration of cement materials is accompanied by the formation of calcium silicate hydrates (CSH). Accordingly, the hydration process is completed in the early, middle, and late periods, leading to the formatio...
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Article
Investigation into Porosity Indices of Nanofiber-Reinforced Concrete
A literature review has been carried out on the effects of carbon nanotubes (CNT) and macrolevel fiber on concrete porosity indices. The results are presented of investigations into the porosity of nanomodifie...
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Article
Physical Properties of Nanoconcrete
Studies have been carried out aimed at improving the corrosion resistance of concrete and its other characteristics for operation in harsh environmental conditions. The influence of a complex additive containi...
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Article
Investigation of the Structure of a Cement Composite Modified by Hydrothermal SiO2 Nanoparticles and MCNT Nanoparticles by the X-Ray Phase Analysis Method
The x-ray phase analysis method has been used to study the effects of small doses of hydrothermal SiO2 nanoparticles and nanoparticles of multiwalled carbon nanotubes (MCNTs) on the structure of a Portland cement...
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Article
Studying the Structure of a Cement Composite Modified by Hydrothermal SiO2 Nanoparticles and MCNTs by the IR-Spectroscopy Method
The influence of hydrothermal small doses of SiO2 nanoparticles (NPs) and multiwalled carbon nanotubes (MCNTs) separately and combined with adding a polycarboxylate superplasticizer (SP) at the water–cement ratio...
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Article
Fracture Toughness of Nanofiber-Reinforced Concrete on Normal Separation and In-Plane Shear
Tests were carried out on various nanoconcrete matrices and with different dispersed reinforcement fabric: carbon nanotubes, basalt fiber (polymer, 3 types of steel, and their combinations). It has been establ...
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Article
Evaluation of Sedimentation Stability of a Complex Nanoadditive
The sedimentation stability of a complex additive containing small doses of SiO2 nanoparticles and multilayer carbon nanotubes has been confirmed experimentally. It has been revealed that the additive remains sed...
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Article
Influence of Polymer Superplasticizers on Various Types of Carbon Nanomaterials
The article presents the results of a study of various types of carbon nanomaterials introduced into polymer superplasticizers and tests of the obtained additives in concrete. It has been established experimen...
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Article
Nanoindentation Method for Studying the Structure of Modified Cement Stone
Preliminary results for the cement specimens under study have been obtained by the nanoindentation method. It has been found that the elastic modulus increases in the specimens that contain a complex admixture...
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Article
Mechanism for Improving the Strength of a Cement Material Modified by SiO2 Nanoparticles and Multiwall Carbon Nanotubes
The authors have given results of investigations into the phase transformations of a cement material modified by a complex nanodisperse admixture that consists of a superplasticizer and nanoparticles (nanosili...
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Article
Tensile Strength of Nanofibrous Concrete
Results of testing nanofibrous-concrete test beams for axial tensile strength, for cleavage tensile strength, and for compressive strength have been given. Concrete matrices covering a broad spectrum of compre...
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Article
Modification of Cement Concrete by Admixtures Containing Nanosized Materials
Experimental studies of several types of nanomaterials (nanosilica, nanocarbon) and comparison of the results of their applications in cement concrete have been carried out. It has been established that the ch...
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Article
Influence of the Nanostructured-Carbon-Based Plasticizing Admixture in a Self-Compacting Concrete Mix on Its Technological Properties
A study has been made of the influence of adding a nanostructured-carbon-based plasticizing admixture to a self-compacting concrete mix on the properties of heavy-weight structural concrete produced from it. I...
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Article
Physicomechanical Characteristics of Concrete Modified by a Nanostructured-Carbon-Based Plasticizing Admixture
The concentration of a nanostructured-carbon-based plasticizing admixture in a concrete mix has been determined, which is optimum for ensuring required technological properties of the mix and physicomechanical...
