Effectiveness of combined nanoadditives for cement systems

Artamonova, O. V.; Slavcheva, G.S.; Chernyshov, E. M.

doi:10.1134/s0020168517100028

Cited by 7 publications

(3 citation statements)

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“…-studies of the possibility of using nanopowders as catalyst supports. Using SiO 2 nanoparticles, which have a high and chemically active surface, one can purposefully influence [68][69][70][71][72][73][74][75][76][77][78][79]:…”

Section: Prospects For Research and Applications Of Hydrothermal Nanomentioning

confidence: 99%

“…-reducing content of Ca(OH) 2 up to 20% to 30% and, thus, increasing content of CSH gel in hardened concrete because of rapid kinetics of pozzolanic reaction of SiO 2 nanoparticles with Ca(OH) 2 [74,75]; hydrothermal SiO 2 nanoparticles with great specific surface area up to 500 m 2 /g and high chemical activity due the surface density of Si-OH groups up to 4.9 nm −2 , which significantly accelerates the kinetics of pozzolanic reaction [68,77,78]; -increase the volume fraction of C-S-H gel phases with greater elasticity and hardness, Ca/Si relation due to modification of nanostructure of hardened concrete, and, as a result, increase the compressive and bending strength of concrete, reduce pore volume, increase water resistance, frost resistance, chemical resistance, and, as a result, the durability of concrete.…”

Section: Prospects For Research and Applications Of Hydrothermal Nanomentioning

confidence: 99%

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Hydrothermal SiO2 Nanopowders: Obtaining Them and Their Characteristics

2020

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The technological mode of obtaining amorphous SiO2 nanopowders based on hydrothermal solutions is proposed in this study. Polycondensation of orthosilicic acid as well as ultrafiltration membrane separation, and cryochemical vacuum sublimation were used. The characteristics of nanopowders were determined by tunneling electron microscopy, low-temperature nitrogen adsorption, X-ray diffraction, and small-angle X-ray scattering. The scheme allows to adjust density, particle diameters of nanopowders, specific surface area, as well as diameters, area and volume of the pore. Thus, the structure of nanopowders is regulated—the volume fraction of the packing of spherical particles in aggregates and agglomerates, the size of agglomerates, and the number of particles in agglomerates. The pour densities of the nanopowders depend on the SiO2 content in sols, which were 0.02 to 0.3 g/cm3. Nanoparticles specific surface area was brought to 500 m2/g by low temperature polycondensation. Nanoparticle aggregates specific pore volume (0.2–0.3 g/cm3) weakly depend on powders density. The volume fraction of the packing of SiO2 nanoparticles in aggregates was 0.6–0.7. Solid samples of compacted nanopowders had a compressive strength of up to 337 MPa. Possible applications of hydrothermal SiO2 nanopowders are considered.

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Section: Prospects For Research and Applications Of Hydrothermal Nanomentioning

confidence: 99%

Section: Prospects For Research and Applications Of Hydrothermal Nanomentioning

confidence: 99%

Hydrothermal SiO2 Nanopowders: Obtaining Them and Their Characteristics

2020

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“…These concretes require a special set of characteristics, i.e., compressive strength and tensile strength (Evelson and Lukuttsova 2015;Topçu and Uygunolu 2010;Yu et al 2018), impact strength (Neville and Brooks 2010;Mahakavi et al 2019), dynamic strength (Kim 2019;Bir Singh et al 2019), crack resistance (Fediuk et al 2018b;Elgalhud et al 2017), impermeability (Fediuk et al 2019;Lye et al 2015) and workability (Chithra et al 2016;Pan et al 2018). Designing materials that can provide a set of these characteristics at a given level is possible only with the use of the latest advances in building materials science and the management of structure formation processes through the use of multicomponent systems (Artamonova et al 2017;Fediuk et al 2017;Asaad et al 2018;Mosaberpanah and Eren 2016;Lesovik et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Link of Self-Compacting Fiber Concrete Behaviors to Composite Binders and Superplasticizer

Федюк

Mosaberpanah

Lesovik

et al. 2020

ACT

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Composite binders were prepared as novel compositions, on the basis of which fiber reinforced self-compacting concretes (FRSCC) with high rheological, mechanical, dynamical, and impermeability behaviors are created. Rice husk ash, quartz sand, and limestone crushing waste within CEM I and different ratio of superplasticizer were investigated as components of composite binders. Central Composite Face Centered method was used to design the number of experiments and randomizations and then screened by Response Surface Methodology. The validity of models was projected by ANOVA. Replacement of cement by waste composite binders as a supplementary cementitious material has a positive effect on mechanical properties of FRSCC from 30% to around 35% of cement replacement. Adding the superplasticizer improved the performance of FRSCC in all aspects in the given range. Increasing the waste composite binders decreased the vapor permeability and effective diffusion coefficient of FRSCC by improving the hydration rate and decreasing the pores of the concrete matrix. Designed FRSCC has the potential to be used as a material for protective structures, because it is able to provide comprehensive protection against the dynamic effects and penetration of gases.

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