Performance Properties of High-Density Impermeable Cementitious Paste

Fediuk, Roman; Timokhin, Roman; Mochalov, Aleksandr; Otsokov, Kamil A.; Lashina, Irina

doi:10.1061/(asce)mt.1943-5533.0002633

Cited by 42 publications

(15 citation statements)

References 31 publications

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“…However, due to the silica fume, the coarser pore size is decreased, and so more and smaller pores retain the same pore volume [90]. The frost durability of the silica fume composite concrete can be enhanced either by lowering the w/b ratio or by reducing the volume of the capillary pores, consequently leading to less scaling [23,[91][92][93][94]. The presence of the amorphous silica fume altered the frost damage mechanism and acted as a strength accelerator due to the formation of a denser microstructure having a lower water penetration during freezing.…”

Section: Composite Portland Cement-based Concretesmentioning

confidence: 99%

A Review of the Mechanical Properties and Durability of Ecological Concretes in a Cold Climate in Comparison to Standard Ordinary Portland Cement-Based Concrete

et al. 2020

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Most of the currently used concretes are based on ordinary Portland cement (OPC) which results in a high carbon dioxide footprint and thus has a negative environmental impact. Replacing OPCs, partially or fully by ecological binders, i.e., supplementary cementitious materials (SCMs) or alternative binders, aims to decrease the carbon dioxide footprint. Both solutions introduced a number of technological problems, including their performance, when exposed to low, subfreezing temperatures during casting operations and the hardening stage. This review indicates that the present knowledge enables the production of OPC-based concretes at temperatures as low as −10 °C, without the need of any additional measures such as, e.g., heating. Conversely, composite cements containing SCMs or alkali-activated binders (AACs) showed mixed performances, ranging from inferior to superior in comparison with OPC. Most concretes based on composite cements require pre/post heat curing or only a short exposure to sub-zero temperatures. At the same time, certain alkali-activated systems performed very well even at −20 °C without the need for additional curing. Chemical admixtures developed for OPC do not always perform well in other binder systems. This review showed that there is only a limited knowledge on how chemical admixtures work in ecological concretes at low temperatures and how to accelerate the hydration rate of composite cements containing high amounts of SCMs or AACs, when these are cured at subfreezing temperatures.

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Section: Composite Portland Cement-based Concretesmentioning

confidence: 99%

A Review of the Mechanical Properties and Durability of Ecological Concretes in a Cold Climate in Comparison to Standard Ordinary Portland Cement-Based Concrete

et al. 2020

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“…Developed by Taguchi and Konishi, the Taguchi method (also known as an orthogonal matrix design) is a useful tool to be applied in industrial processes (Adewale et al, 2017). Remarkably, for biochemical processes, it is possible to optimize processes and increase the quality of products (Lesovik et al, 2018;Fediuk et al, 2019;Murali and Fediuk, 2020), with a reduced number of experimental runs and, therefore, reduced costs (Adewale et al, 2017). Improving quality and reliability is made through design, and this requires proper planning and layout of the experiments and accurate analysis of the results (Murali and Fediuk, 2020).…”

Section: Introductionmentioning

confidence: 99%

Lipase From Rhizomucor miehei Immobilized on Magnetic Nanoparticles: Performance in Fatty Acid Ethyl Ester (FAEE) Optimized Production by the Taguchi Method

Moreira

Oliveira

Júnior

et al. 2020

Front. Bioeng. Biotechnol.

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In this communication, it was evaluated the production of fatty acid ethyl ester (FAAE) from the free fatty acids of babassu oil catalyzed by lipase from Rhizomucor miehei (RML) immobilized on magnetic nanoparticles (MNP) coated with 3-aminopropyltriethoxysilane (APTES), Fe 3 O 4 @APTES-RML or RML-MNP for short. MNPs were prepared by co-precipitation coated with 3-aminopropyltriethoxysilane and used as a support to immobilize RML (immobilization yield: 94.7 ± 1.0%; biocatalyst activity: 341.3 ± 1.2 U p−NPB /g), which were also activated with glutaraldehyde and then used to immobilize RML (immobilization yield: 91.9 ± 0.2%; biocatalyst activity: 199.6 ± 3.5 U p−NPB /g). RML-MNP was characterized by X-Ray Powder Diffraction (XRPD), Fourier Transform-Infrared (FTIR) spectroscopy and Scanning Electron Microscope (SEM), proving the incorporation and immobilization of RML on the APTES matrix. In addition, the immobilized biocatalyst presented at 60 • C a half-life 16-19 times greater than that of the soluble lipase in the pH range 5-10. RML and RML-MNP showed higher activity at pH 7; the immobilized enzyme was more active than the free enzyme in the pH range (5-10) analyzed. For the production of fatty acid ethyl ester, under optimal conditions [40 • C, 6 h, 1:1 (FFAs/alcohol)] determined by the Taguchi method, it was possible to obtain conversion of 81.7 ± 0.7% using 5% of RML-MNP.

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“…Effective concretes for protective structures in connection with the increasing number of natural and manmade disasters, as well as heightened international tensions, are now of particular importance (Murali and Ramprasad 2018;Fediuk et al 2018a;Yoo et al 2016;Aly et al 2019;Matias et al 2013). 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%

“…De Sensale and Viacava (2018), Fediuk et al (2017Fediuk et al ( , 2018aFediuk et al ( , 2018bFediuk et al ( , 2019, as well as the Geomimetics Scientific School (Lesovik et al 2018(Lesovik et al , 2019 were engaged in increasing the strength and impermeability of structures. It is proved that the creation of high density and high strength composites is possible only due to the synergistic effect of organic and mineral additives, as well as through the management of structure formation at the nano-, micro-and macro-levels.…”

Section: Introductionmentioning

confidence: 99%

“…An effective method is the use for the materials of protective structures a fiber reinforced concrete, which potentially has a high impact resistance (Klyuev et al 2018;Lesovik et al 2018;Urkhanova et al 2018;Fediuk et al 2017Fediuk et al , 2018aFediuk et al , 2018bFediuk et al , 2019Abrishambaf 2017;Yoo 2016).The distribution of stresses in the concrete matrix, provided by the dispersion reinforcement leads, to a certain extent, to the growth of the whole complex of physical and mechanical properties and performance characteristics of the composite: both compressive and tensile strengths, crack resistance, impact endurance (Lesovik et al 2019;Ganesh et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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

Федюк

Mosaberpanah

Lesovik

et al. 2020

ACT

Self Cite

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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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Performance Properties of High-Density Impermeable Cementitious Paste

Cited by 42 publications

References 31 publications

A Review of the Mechanical Properties and Durability of Ecological Concretes in a Cold Climate in Comparison to Standard Ordinary Portland Cement-Based Concrete

A Review of the Mechanical Properties and Durability of Ecological Concretes in a Cold Climate in Comparison to Standard Ordinary Portland Cement-Based Concrete

Lipase From Rhizomucor miehei Immobilized on Magnetic Nanoparticles: Performance in Fatty Acid Ethyl Ester (FAEE) Optimized Production by the Taguchi Method

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

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