Influence of the Nanostructured-Carbon-Based Plasticizing Admixture in a Self-Compacting Concrete Mix on Its Technological Properties

Жданок, С. А.; Полонина, Е. Н.; Леонович, С. Н.; Khroustalev, B. M.; Koleda, E. A.

doi:10.1007/s10891-019-01941-7

Cited by 11 publications

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“…The following materials were used in the work as nanomaterials: water sol of nanosilicа SiO 2 , obtained from hydrothermal fluids, with characteristics of a pH = 9.2, density ρ = 1075 g/dm 3 , solids content of nanosilica SiO 2 = 120 g/dm 3 , total salinity equal to 1720 mg/dm 3 [26][27][28] and carbon nanotubes obtained in a plasma of a high-voltage atmospheric pressure discharge with the optimal composition of the CH 4 gas mixture: air = = 1:(2.4-2.5), followed by chemical treatment with a mass fraction of solids of not less than 37 %, pH = 7.0, ρ = 1.1 g/cm 3 [29][30][31][32][33][34][35][36]. Superplasticizer from a series of polycarboxylates highly effective in water-reducing ability in the form of an aqueous solution.…”

Section: Materials and Methods Of Experimental Studiesmentioning

confidence: 99%

Cement-Based Materials Modified with Nanoscale Additives

et al. 2021

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The most common and reliable material without which modern construction is indispensable is concrete. The development of construction production is pushing for new solutions to improve the quality of concrete mix and concrete. The most demanded and significant indicators of a concrete mixture are the compressive strength and mobility of the concrete mixture. Every year, the volume of research on nanomaterials as modifying components of concrete is significantly increasing, and the results indicate the prospects for their use. Nanoparticles with a large specific surface are distinguished by chemical activity, can accelerate hydration and increase strength characteristics due to nucleation and subsequent formation of C–S–H and compaction of the material microstructure. Sol of nanosilica, which can be used instead of microsilica from industrial enterprises, and carbon nanomaterial have a wide reproduction base. This paper presents studies of these types of nanomaterials and the results of their application in cement concrete. Studies have shown that the effect is also observed with the introduction of an additive containing only one type of nanoparticles. The dependence of the obtained characteristics of cement concretes on the content of these nanomaterials has been established. It has been found that the best results were obtained with an additive in which the above-mentioned nanomaterials were used together. Compressive strength of heavy concrete samples, improved by the complex nanodispersed system, was 78.7 MPa, which exceeds the strength of the sample containing the CNT additive in a pair with a super-plasticizer by 37 %. The paper proposes the mechanism for action of the presented complex additive.

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Section: Materials and Methods Of Experimental Studiesmentioning

confidence: 99%

Cement-Based Materials Modified with Nanoscale Additives

et al. 2021

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“…In the process of pulling out a microvolume directly from the structure in a given area, in addition to the magnitude of the force, the dimensions of the truncated fracture cone are determined: the radius rо, the length h of the hole, the length of the generatrix l of the fracture cone, and the critical stress intensity factor K IC of nanofiber-reinforced concrete is calculated according to the formula [16]…”

Section: Determination Of the Strength And Critical Stress Intensity ...mentioning

confidence: 99%

Multi-Parameter Methodology for Assessing Quality Indicators of Nanomodified Fiber-Reinforced Concrete for Construction Site

Leonovich,

Sadovskaya,

Koleda

2023

Nauka teh.

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Nanomodified fiber-reinforced concrete is a building material for which the required characteristics of fracture toughness are a distinctive feature. Determination of the stress intensity factor of fiber-reinforced concrete makes it possible to correctly assess the resistance of the material during the formation and development of cracks. The proposed multi-parameter methodology for assessing the quality indicators of nanomodified fiber-reinforced concrete makes it possible to evaluate the quality of a fiber-reinforced concrete structure in construction and laboratory conditions. To carry out control at the construction site, modern and long-used methods of non-destructive testing are used: ultrasonic sounding, ultrasonic tomography, elastic rebound, separation with chipping. For laboratory studies, the technique provides for the manufacture of prism samples that can be molded or cut from the body of the structure. This methodology makes it possible to obtain in laboratory conditions such material parameters as tensile strength in bending, tensile strength in splitting, critical stress intensity factor for normal separation, critical stress intensity factor for transverse shear, energy consumption for individual stages of deformation and destruction of the sample, as well as to evaluate the uniformity of distribution fibers. Moreover, it is provided to obtain all the parameters on one sample from the series, which eliminates errors and inaccuracies in the quality indicators of the material associated with different conditions of hardening, molding, inaccuracies in duplicating the composition.

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“…To overcome these limitations, the next approaches have been proposed by various research teams: the addition of either calcium hydroxide powder (5 %) or rapid set cement (5-10 %) [19], silica fume (10 %) and lime (30 %) [21], the replacement of cement with 5 % of nanolimestone [22] or nano-SiO2 [8], the use of ternary blended cements with limestone and Portland cement [7] or high-range water reducing admixtures [23] as well as internal curing to improve hardening process [20]. Belarusian scientists have developed a nanostructuredcarbon-based plasticizing admixture, which makes it possible to produce concrete with exceptional physical-mechanical properties [24,25]. Besides, the admixture provides an adequate compressive strength of concrete with addition of fly ash both at early and project ages of hardening.…”

Section: Introductionmentioning

confidence: 99%

Beneficiated ponded fly ash for concretes with high volume mineral additions

2020

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The article presents the investigation results of effect of beneficiated ponded fly ash on the properties of cement pastes and concretes with high-level replacement of Portland cement. To improve the characteristics of ponded fly ash meeting technical requirements for replacing cement in concrete the triboelectrostatic beneficiation technology has been elaborated. This technology can produce low-carbon ash product (LOI = 2.52 % in this study) for the high replacing level of cement (45 %) in concretes. The beneficiated ponded fly ash has an improved granulometric and phase composition, a decreased content of unburned carbon that accelerates the hydration process of cement, increases the rheological properties of cement paste and the ability of air-entraining admixture to hold the required involved air. In a combination with the nanostructured-carbon-based plasticizing admixture the beneficiated ponded fly ash exhibits high rate of strength increase when is used in high-volume fly ash concretes.

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Influence of the Nanostructured-Carbon-Based Plasticizing Admixture in a Self-Compacting Concrete Mix on Its Technological Properties

Cited by 11 publications

References 0 publications

Cement-Based Materials Modified with Nanoscale Additives

Cement-Based Materials Modified with Nanoscale Additives

Multi-Parameter Methodology for Assessing Quality Indicators of Nanomodified Fiber-Reinforced Concrete for Construction Site

Beneficiated ponded fly ash for concretes with high volume mineral additions

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