HARDENING AND EFFLORESCENCE RESISTANCE OF CEMENT MORTARS MODIFIED BY BLACK SHALE

Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel nogo universiteta JOURNAL of Construction and Architecture ◽

10.31675/1607-1859-2018-20-5-119-127 ◽

2018 ◽

pp. 119-127

Author(s):

S. A. Belykh ◽

A. A. Chikichev ◽

L. V. Il''ina ◽

A. I. Kudyakov

Keyword(s):

Structure Formation ◽

Black Shale ◽

Thermal Analyses ◽

Gold Extraction ◽

X Ray ◽

Cement Mortars ◽

Calcium Hydrosilicates

The paper presents results of research into plaster coating of brick walls in humid premises. It is found that the addition of black shale and waste from flotation gold extraction from ores in the amount of 10 % of the cement bulk, increases the structure formation and strength of mortars by 34 %. X-ray phase and differential thermal analyses show that the increase in the rate of structure formation of mortars is due to the interaction of hydraulically active ground black shale with portlandite accompanied by the formation of calcium hydrosilicates. In mortars with the black shale addition, 1–2 nm pores form, which explain the increased resistance of mortars to the effloresce formation on the surface of plaster coatings of brick walls.

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Features of the Structure Formation of Silicate Bricks Obtained with the Use of Solid Waste Produced by JSC "Berezniki Soda Plant"

Ecology and Industry of Russia ◽

10.18412/1816-0395-2019-11-60-65 ◽

2019 ◽

Vol 23 (11) ◽

pp. 60-65

Author(s):

S.V. Leontev ◽

V.A. Shamanov ◽

A.D. Kurzanov

Keyword(s):

Moisture Content ◽

Solid Waste ◽

Structure Formation ◽

Heterogeneous Structure ◽

Electron Microscopic ◽

Passive Components ◽

X Ray ◽

Production Wastes ◽

Calcium Hydrosilicates ◽

Mineral Additives

The results of studying the structure formation features of silicate bricks obtained with the use of solid waste produced by JSC "Berezniki soda plant" are presented in this article. Various samples, such as sludge from the "closed" sump with a moisture content of 5 %, sludge from the open sump surface with a moisture content of 35 %, moistened sludge from the open sump with a moisture content of 70 %, were taken from the sludge collectors for the research. It was established the building lime meeting the requirements of GOST 9179 can be received by means of heat treatment at 950 °C of the dehydrated slime selected from the closed settler. By results of silicate brick samples forming parameters and their structure optimization it was found that the use of lime from soda production solid waste as part of lime-silica autoclave hardening binder allows to obtain silicate bricks samples, characterized by the strength grade M200. Samples microstructure studies obtained using the methods of electron microscopic and x-ray phase analysis showed that silicate samples produced with the use of soda production waste are characterized by a cementing substance heterogeneous structure and an insufficient number of tobermorite group low-basic calcium hydrosilicates formed during autoclaving. This is due to the waste material composition, namely the presence of reactive-passive components and impurities. Increasing the structural strength of samples made with the use of soda production wastes is possible due to raising the lime-silica binder specific surface area and the binder modification with fine mineral additives.

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Structure of the amorphous titania precursor phase of N-doped photocatalysts

RSC Advances ◽

10.1039/d0ra08886b ◽

2021 ◽

Vol 11 (15) ◽

pp. 8619-8627

Author(s):

I. E. Grey ◽

P. Bordet ◽

N. C. Wilson

Keyword(s):

Thermal Analyses ◽

Real Space ◽

Ammonia Solution ◽

Scattering Data ◽

X Ray ◽

X Ray Scattering ◽

Amorphous Titania ◽

Precursor Phase ◽

Titania Precursor ◽

Titanyl Sulphate

Amorphous titania samples prepared by ammonia solution neutralization of titanyl sulphate have been characterized by chemical and thermal analyses, and with reciprocal-space and real-space fitting of wide-angle synchrotron X-ray scattering data.

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Novel tetrazole PtII and PdII complexes with enhanced water solubility: synthesis, structural characterization and evaluation of antiproliferative activity

Zeitschrift für Kristallographie - Crystalline Materials ◽

10.1515/zkri-2020-0082 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Tatiyana V. Serebryanskaya ◽

Alexander S. Lyakhov ◽

Ludmila S. Ivashkevich ◽

Yuri V. Grigoriev ◽

Andreii S. Kritchenkov ◽

...

Keyword(s):

Mass Spectrometry ◽

High Performance ◽

Water Solubility ◽

Thermal Analyses ◽

High Water ◽

Acetonitrile Solution ◽

X Ray ◽

Molecular And Crystal Structures ◽

Tetrazole Derivatives ◽

High Water Solubility

AbstractNovel platinum(II) and palladium(II) chlorido complexes with tetrazole derivatives 1-(2-hydroxyethyl)tetrazole (het) and 1-[tris(hydroxymethyl)methyl]tetrazole (thm), viz. cis-[Pt(het)2Cl2], trans-[Pt(het)2Cl2], trans-[Pt(thm)2Cl2], trans-[Pd(het)2Cl2], and trans-[Pd(thm)2Cl2], were synthesized. The compounds were characterized by elemental and high-resolution electrospray ionization (HRESI) mass spectrometry, high-performance liquid chromatography (HPLC), 1H, 13C and 195Pt nuclear magnetic resonance (NMR) spectroscopy, thermal analyses, and Infrared (IR) spectroscopy. Molecular and crystal structures of trans-[PdL2Cl2] and trans-[PtL2Cl2] (L = het, thm) were established by single-crystal X-ray analysis. The complex cis-[Pt(het)2Cl2] was found to undergo cis–to–trans isomerization upon heating in acetonitrile solution and in the solid state. The synthesized complexes show rather high water solubility lying in the range of 2–10 mg/L.

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Copper-containing nanocomposites on the basis of isotactic polypropylene and butadiene-nitrile rubber

Perspektivnye Materialy ◽

10.30791/1028-978x-2021-5-76-81 ◽

2021 ◽

Vol 5 ◽

pp. 76-81

Author(s):

N.I. Kurbanova ◽

◽

S. K. Ragimova ◽

N. A. Alimirzoeva ◽

N. Ya. Ishenko ◽

...

Keyword(s):

Isotactic Polypropylene ◽

Thermal Analyses ◽

Nitrile Rubber ◽

Polymer Composition ◽

Rheological Parameters ◽

Structure And Properties ◽

Pressing Method ◽

X Ray ◽

High Pressure Polyethylene ◽

Butadiene Nitrile Rubber

The influence of additives of nanofillers (NF) containing nanoparticles of copper oxides stabilized by a polymer matrix of high-pressure polyethylene (PE) obtained by the mechanochemical method on the structure and properties features of metal-containing nanocomposites based on isotactic polypropylene (PP) and butadiene-nitrile rubber (BNK) is studied by X-ray phase (XRD) and differential thermal analyses(DTA). The improvement of strength, deformation and rheological parameters, as well as thermal-oxidative stability of the obtained nanocomposites was revealed, which, apparently, is associated with the synergistic effect of interfacial interaction of copper-containing nanoparticles in the PE matrix with the components of the PP/BNK polymer composition. It is shown that nanocomposites based on PP/BNK/NF can be processed both by pressing method and by injection molding and extrusion methods, which expands the scope of its application.

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Influence of Mix Fly and Bottom Ashes from Biomass on Selected Properties of Cement Mortars

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.828.14 ◽

2019 ◽

Vol 828 ◽

pp. 14-17

Author(s):

Malgorzata Ulewicz ◽

Jakub Jura

Keyword(s):

Electron Microscopy ◽

Compressive Strength ◽

Industrial Waste ◽

Cement Mortar ◽

Raw Materials ◽

Bottom Ash ◽

Waste Materials ◽

X Ray ◽

Cement Mortars ◽

Fluorescence Spectrometer

The preliminary results of utilization of fly and bottom ash from combustion of biomass for the produce of cement mortars has been presented. Currently, this waste are deposited in industrial waste landfills. The chemical composition of waste materials was determined using X-ray fluorescence (spectrometer ARL Advant 'XP). ). In the studies sand was replaced by mix of fly and bottom ash from the combustion of biomass in an amount of 10-30% by weight of cement CEM I 42.5 R (Cemex). The obtained cement mortar concrete were subjected to microscopic examination (LEO Electron Microscopy Ltd.) and their compressive strength (PN-EN-196-1), frost resistance (PN-EN 1015-11 and PN-B -04500 ) and absorbability (PN-85/B-04500) were identified. The obtained results showed, the replacement of the cement by mix ashes from combustion of biomass reduce consumption of raw materials and will have a good influence on the environment.

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Titania powder activation and rutile ceramics structure formation

Science of Sintering ◽

10.2298/sos0901027z ◽

2009 ◽

Vol 41 (1) ◽

pp. 27-33 ◽

Cited By ~ 2

Author(s):

I.R. Ziganshin ◽

S.E. Porozova ◽

A.E. Stolina ◽

M.F. Torsunov

Keyword(s):

Raman Spectroscopy ◽

Porous Materials ◽

Optical Microscopy ◽

Aqueous Medium ◽

Structure Formation ◽

Mechanochemical Activation ◽

Organic Additives ◽

X Ray Diffraction ◽

X Ray ◽

Titania Powder

Impact of mechanochemical activation (MCA) in aqueous medium with various organic additives on commercial titania powder and products made of it has been investigated by X-ray diffraction, optical microscopy and Raman spectroscopy. Agar-agar additive has been shown to offer promise for activation of titania powders used in obtaining both dense and porous materials.

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THE INFLUENCE OF THE META-STABLE TRIPLE POINT SOLUTION OF MONOCALCIUM PHOSPHATE MONOHYDRATE UPON THE CLAY SEPARATES OF TWO ONTARIO SOILS

Canadian Journal of Soil Science ◽

10.4141/cjss63-032 ◽

1963 ◽

Vol 43 (2) ◽

pp. 260-267

Author(s):

A. F. MacKenzie ◽

C. A. Campbell

Keyword(s):

Electron Microscope ◽

Triple Point ◽

Thermal Analyses ◽

Chemical Analyses ◽

Clay Loam ◽

X Ray Diffraction ◽

Monocalcium Phosphate ◽

X Ray ◽

Point Solution ◽

Soil Clay

Samples of material less than 2 μ in diameter were obtained from the surface horizon of a Guelph loam and of a Haldimand clay loam. These samples were subjected to six successive treatments with the meta-stable triple point solution of monocalcium phosphate monohydrate (MTPS) to simulate the environment near a dissolving superphosphate granule. Samples of montmorillonite and illite standard clays were also included. The dissolution losses in per cent were: Guelph clay 59.5, Haldimand clay 40.4, montmorillonite 3.4, and illite 8.1. Total chemical analyses, X-ray diffraction techniques, differential thermal analyses and electron microscope observations were used to determine the nature of these losses. In the soil clay separates, vermiculite and interstratified montmorillonite were more susceptible to the action of MTPS than were the illite or halloysite clay minerals.

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High-Temperature Modifications of Thorium Dicarbide

Advances in X-ray Analysis ◽

10.1154/s0376030800002998 ◽

1964 ◽

Vol 8 ◽

pp. 78-85 ◽

Cited By ~ 1

Author(s):

P. K. Gantzel ◽

S. Langer ◽

N. L. Baldwin ◽

F. L. Kester

Keyword(s):

Thermal Analysis ◽

Differential Thermal Analysis ◽

High Temperature ◽

Thermal Effects ◽

Room Temperature ◽

Thermal Analyses ◽

Tetragonal Modification ◽

X Ray ◽

Space Groups ◽

Heating And Cooling

AbstractThermal analyses of samples of thorium dicarbide in equilibrium with graphite show arrests which indicate phase transitions at 1427 ± 21°C arid 1481 ± 28°C. These thermal effects have been observed on heating and cooling both in standard thermal analysis and in differential thermal analysis using graphite as a reference material. The microstructure of thorium dicarbide samples shows the characteristic “herringbone” pattern of a material which has undergone a martensitic-type transition.A high-temperature X-ray investigation has revealed that the observed thermal arrests correspond to erystallographic transformations. The monodinic modification found at room temperature is stable to 1427°C, at which temperature a tetragonal modification with a0 = 4.235 ± 0.002Å and c0 = 5.408 ± 0.002Å is formed. At 1481°C, the tetragonal is transformed to cubic with a0 = 5.809 ± 0.002 Å. The best agreement between observed and calculated intensities has been obtained with C-C units of 1.5-Å assumed bond length in space groups P42/mmc and Pa3 for the tetragonal and cubic modifications, respectively.

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