Performance of Low Carbon Modified Composite Gypsum Binders with Increased Resistance

Sanytsky, Myroslav; Kropyvnytska, Тetiana; Fischer, Hans-Bertram; Kondratieva, Natalia

doi:10.23939/chcht13.04.495

Cited by 13 publications

(6 citation statements)

References 12 publications

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“…It acts as a passive blocking layer without negative effect on the paste flowability. But over time ettringite recrystallizes into prismatic needle-like crystals, which tend to coalesce during setting and later strengthen the structure of hardened binder [20,24,25].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Preparation of Hydrophobic CNTs-Coated Melamine Formaldehyde Foam by Green and Simple Method for Efficient Oil/Water Separation

Phan¹,

Dang²,

Nguyen-Dinh³

2020

ChChT

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Hydrophobic porous polymeric materials have attracted great interests recently as potential candicate for oil-water separation due to their high selectivity and sorption capacity. Herein, we present a green, simple and cost-effective method to change hydrophilic melamine formaldehyde (MF) foam to hydrophobic carbon nanotubes (CNTs) coated MF foam through an immersion process. The MF foam was produced from the MF resin which was synthesized in a laboratory by a condensation reaction between melamine and formaldehyde under alkaline condition with a molar ratio of melamine to formaldehyde of 1:3. The MF foam has an open-cell structure with the average pore diameter of 350 m, density of 25 kg •m-3 and porosity of 98 %. The as-prepared CNTs-coated MF foam exhibits high sorption capacity (23–-66 g/g) for oils and organic solvents, good recyclability and high selectivity.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Preparation of Hydrophobic CNTs-Coated Melamine Formaldehyde Foam by Green and Simple Method for Efficient Oil/Water Separation

Phan¹,

Dang²,

Nguyen-Dinh³

2020

ChChT

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“…An addition of 14% of the ultra-dispersed zeolite to gypsum resulted in an increase of its water resistance from 0.31 to 0.84 [7]. An analogous effect [10] caused by the addition of zeolite and carboxylate is also explained by an essential change in the structure. In [13], an increase in the gypsum strength is explained by the effect of the dispersed reinforcement.…”

Section: Analytical Review Of Literature Sourcesmentioning

confidence: 91%

“…Gypsum modifications are described in many research papers [2][3][4][5][6], etc. The water resistance of gypsum binders can be increased by a decrease in the water-to-gypsum ratio, by combination with hydraulic binders [4][5][6] and by addition of mineral additives-fillers [7][8][9][10][11][12], hydrophobization additives [12], polymers and the fiber [13]. The authors give different explanations to the reasons that contribute to the improvement of the properties.…”

Section: Analytical Review Of Literature Sourcesmentioning

confidence: 99%

“…In order to form a denser structure of gypsum stone, the authors [22] use the methods of the computer simulation of the composition of the raw mixture and in [2] they substantiate an optimal proportion that provides a maximum strength for the mixed binder made of slag, gypsum and clinker. In [5,7,10,13], consideration is given to the microreinforcing action of mineral additives on gypsum stone and its effect on the strength. An addition of 14% of the ultra-dispersed zeolite to gypsum resulted in an increase of its water resistance from 0.31 to 0.84 [7].…”

Section: Analytical Review Of Literature Sourcesmentioning

confidence: 99%

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Effect of mineral additives to a gypsum wet deformation

et al. 2021

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The influence of mineral additive, i.e. ground granulated blast-furnace slag on artificial gypsum stone humidity strains has been studied. The slag content was varied in the range from 0 to 0.33 by weight based on the total amount of the mixture. The measurements were carried out on prism samples with dimensions of 160x40x40 mm. The samples were placed vertically in containers with water, the deformations were measured using dial indicators. It was established that the humidity strain value depends on the content of the granulated milled blastfurnace slag. A maximum strain of over 0.001 m/m is observed for the gypsum stone without mineral additive. A relative strain is decreased with an increase in the slag content. Minimum humidity strain of 0.0003-0.0004 m/m was observed for the artificial gypsum stone with the relative slag content of 0.05-0.1 and more than 0.27. This fact confirms our assumption that the water concentrated in the contacts between the individual crystals and particles of the structure of gypsum stone has a wedging effect that contributes to a low water resistance of gypsum. The values of the humidity strains of the artificial gypsum stone are suggested for the use as additional indicators of its water resistance.

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“…A rational solution to the problem of ensuring low-carbon development of the cement industry is the production of technologically optimized composite cement with favorable combinations of mineral components providing technical, economic and ecological advantages. [1][2][3][4] At the same time, when using Portland cement systems, there are often problems related to their accelerated setting time. In Portland cement clinker, impurity alkalis may appear, which cause rapid shrinkage, decreases the final strength of concrete, and increases seating deformations during the hardening process.…”

Section: Introductionmentioning

confidence: 99%

Performance of Electrocoagulation Process Using Iron and Aluminum Electrodes with and without Perforations

Konduru¹,

Vangalapati²,

Shaik³

2023

ChChT

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Electrocoagulation process is widely used for the removal of pollutants from the industrial wastewater. In the present study, an attempt was made to investigate the performance of electrocoagulation process using alu-minum and iron electrodes to treat the metal ions present in the synthetic galvanic wastewater. The electrodes used are with and without perforations and it was observed that the efficiency of electrodes with perforation (80 %) was higher than without perforations (50 %). The removal efficiency of heavy metal ions increased with retention time and direct current. The optimized values of residence time, voltage, pH, current, electrode spacing were 160 min, 6 V, 5, 0.2 A, and 3 cm, respectively. The maximum removal percentage of nickel and copper ions using perforated iron electrodes was 90.7 % and 86.0 %, respectively, and for chromium using a combination of perforated iron and aluminum electrodes it was 93.1 %. The removal of metal ions followed pseudo second order kinetic model with current dependent parameters.

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Performance of Low Carbon Modified Composite Gypsum Binders with Increased Resistance

Cited by 13 publications

References 12 publications

Synthesis and Preparation of Hydrophobic CNTs-Coated Melamine Formaldehyde Foam by Green and Simple Method for Efficient Oil/Water Separation

Synthesis and Preparation of Hydrophobic CNTs-Coated Melamine Formaldehyde Foam by Green and Simple Method for Efficient Oil/Water Separation

Effect of mineral additives to a gypsum wet deformation

Performance of Electrocoagulation Process Using Iron and Aluminum Electrodes with and without Perforations

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