PERFORMANCE CHARACTERISTICS OF 3D PRINTING CONSTRUCTION MIXES DEPENDING ON THERMALLYMODIFIED PEAT ADDITIVE

The paper presents the research results on the development of scientifically valid compositions of 3D printing construction mixes with improved performance characteristics. To regulate the physical, mechanical and technological properties of cement-based mixes, thermallymodified peat additive MT-600 is developed. The paper studies the world experience in the construction additive technology field. The experimental results are presented for cement paste and construction mixes with MT-600 additive for 3D printing. It is established that using the proposed fine additive increases the strength of the cement paste at early stages of hardening, which is the determining factor in the formation of building and technical characteristics for 3D printing. The X-ray phase analysis is carried out for the new composition of cement paste modified with MT-600 additive, which allows studying characteristics of the structure and properties of construction mixes during the hardening process.

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Development of 3D Printing Technology with Ceramic Paste and Study of Properties of Printed Corundum Products

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1040.178 ◽

2021 ◽

Vol 1040 ◽

pp. 178-184

Author(s):

Andrey S. Dolgin ◽

Aleksei I. Makogon ◽

Sergey P. Bogdanov

Keyword(s):

3D Printing ◽

Aluminum Oxide ◽

Reference Sample ◽

Physical And Mechanical Properties ◽

Ceramic Technology ◽

Raw Material ◽

Energy Costs ◽

Additive Technology ◽

X Ray ◽

Manufacturing Time

Today 3D printing with ceramics is a promising direction in the development of additive technologies. In this work, we have developed a technology for printing with ceramic pastes based on aluminum oxide and wax, namely: an extruder for printing with ceramic pastes was modeled and manufactured, the composition of the slip was selected and the paste for printing was made. After choosing the print parameters, test samples were printed: a disk and a box. Since 3D printing with ceramics is just one of the stages of manufacturing ceramic products, then we selected the parameters for drying and sintering the raw material. Drying of products is necessary to burn off an excess amount of a binder (paraffin), and due to sintering; the raw material acquires final strength and mechanical characteristics. After sintering, the sintering parameters and physical and mechanical properties of the products were measured. The microstructure of the printed products was studied using scanning electron microscopy. The phase change during sintering was studied by X-ray analysis. All obtained properties were compared with a reference sample (corundum tile made of aluminum oxide of the same grade, but using traditional ceramic technology, including pressing, drying and sintering of the product). In terms of all properties, the printed ceramics are not significantly inferior to the reference sample; however, in general, the additive technology has more advantages, such as a wide variety of shapes, shorter manufacturing time for parts, and lower energy costs.

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Technology of 3D Printing of Light Ceramics for Construction Products

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.316.1038 ◽

2021 ◽

Vol 316 ◽

pp. 1038-1043

Author(s):

V.A. Beregovoi ◽

A.M. Beregovoi ◽

I.Yu. Lavrov

Keyword(s):

3D Printing ◽

Raw Material ◽

3D Printer ◽

Technological Properties ◽

Kinematic Scheme ◽

Additive Technology ◽

Chemical Additives ◽

Optimal Amount ◽

Construction Products ◽

Mineral Mixtures

A 3D-printer for working with plastic mineral mixtures is developed, its kinematic scheme and principle of operation are described. The results of experiments on printing simple forms of plastic clay, using a piston-type extruder, are presented. In relation to an additive technology, a list of technological properties of mineral masses is defined The optimal amount of chemical additives has been established, which provides an increase in the uniformity of the raw material mass for printing products from light ceramics.

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The structure and properties of oriented fibers of poly(pentamethylene terephthalate). II. Structural analysis of two different crystalline phases by x-ray crystallography

Journal of Polymer Science Polymer Physics Edition ◽

10.1002/pol.1978.180161208 ◽

1978 ◽

Vol 16 (12) ◽

pp. 2189-2214 ◽

Cited By ~ 19

Author(s):

I. H. Hall ◽

N. N. Rammo

Keyword(s):

Structural Analysis ◽

Structure And Properties ◽

Crystalline Phases ◽

X Ray ◽

X Ray Crystallography

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Study on attenuation of 3D printing commercial filaments on standard X-ray beams for dosimetry and tissue equivalence

Radiation Physics and Chemistry ◽

10.1016/j.radphyschem.2021.109365 ◽

2021 ◽

Vol 182 ◽

pp. 109365

Author(s):

M. Savi ◽

D. Villani ◽

M.A.B. Andrade ◽

O. Rodrigues ◽

M.P.A. Potiens

Keyword(s):

3D Printing ◽

X Ray

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Performance Characteristics, Image Quality and Development Trends in X-Ray Image Intensifiers

10.1117/12.965506 ◽

1979 ◽

Author(s):

W. Kuhl ◽

J. E. Schrijvers ◽

B. v. d. Eijk

Keyword(s):

Image Quality ◽

Performance Characteristics ◽

Development Trends ◽

X Ray ◽

Image Intensifiers

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Study on Relationship between Structure and Properties of Polycarboxylate Superplasticizer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.487.43 ◽

2012 ◽

Vol 487 ◽

pp. 43-47

Author(s):

Sheng Hua Lv ◽

Di Li ◽

Qiang Cao

Keyword(s):

Acrylic Acid ◽

Zeta Potential ◽

Ethyl Ester ◽

Functional Groups ◽

Cement Paste ◽

Ethyl Acrylate ◽

Structure And Properties ◽

Polycarboxylate Superplasticizer ◽

Carboxylic Groups

A polycarboxylate superplasticizer (PCs) was synthesized by copolymerization of allyl polyoxyethylene ethers (APE), acrylic acid (AA), sodium methylallyl Sulfonate (SMAS) and ethyl acrylate (EA). The effect of functional groups and branch chain on PCs properties was investigated by the test of fluidity of cement paste, retardation performance and Zeta potential of cement particles. The results showed that carboxylic groups and ethyl ester groups can improve water reducing ratio and fluidity of cement paste, and the sulfonic groups has an important contributiion to retardation performance of PCs.

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X-ray structure and properties of a cyclo[6]pyrrole[3]thiophene

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424612501325 ◽

2013 ◽

Vol 17 (01n02) ◽

pp. 27-35 ◽

Cited By ~ 5

Author(s):

Thanh-Tuan Bui ◽

Aude Escande ◽

Christian Philouze ◽

Gianluca Cioci ◽

Sudip Ghosh ◽

...

Keyword(s):

Synchrotron Radiation ◽

Structure And Properties ◽

X Ray ◽

Expanded Porphyrins ◽

Pyrrole Derivative

A new member of the cyclo[n]pyrrole class of expanded porphyrins was prepared from the corresponding thiophene-containing terpyrrole precursor through use of a mild electrochemical oxidative procedure. The isolated macrocycle, featuring nine heterocyclic subunits directly connected through their α,α′-positions, is the largest cyclo[n]pyrrole derivative reported to date. The structure obtained via synchrotron radiation-based studies revealed a dimeric arrangement involving individual macrocyclic subunits.

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Monitoring of steel corrosion and cracking in cement paste exposed to combined sulfate–chloride attack with X-ray microtomography

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.124345 ◽

2021 ◽

Vol 302 ◽

pp. 124345

Author(s):

Hongfang Sun ◽

Ce Jiang ◽

Kun Cao ◽

Dong Yu ◽

Wei Liu ◽

...

Keyword(s):

Cement Paste ◽

Steel Corrosion ◽

X Ray ◽

Chloride Attack

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Influence of Drug Load on the Printability and Solid-State Properties of 3D-Printed Naproxen-Based Amorphous Solid Dispersion

Molecules ◽

10.3390/molecules26154492 ◽

2021 ◽

Vol 26 (15) ◽

pp. 4492

Author(s):

Eric Ofosu Kissi ◽

Robin Nilsson ◽

Liebert Parreiras Nogueira ◽

Anette Larsson ◽

Ingunn Tho

Keyword(s):

Solid State ◽

3D Printing ◽

Solid Dispersion ◽

Physical Stability ◽

Amorphous Solid ◽

Amorphous Solid Dispersion ◽

Drug Load ◽

X Ray ◽

3D Printed ◽

Hot Melt

Fused deposition modelling-based 3D printing of pharmaceutical products is facing challenges like brittleness and printability of the drug-loaded hot-melt extruded filament feedstock and stabilization of the solid-state form of the drug in the final product. The aim of this study was to investigate the influence of the drug load on printability and physical stability. The poor glass former naproxen (NAP) was hot-melt extruded with Kollidon® VA 64 at 10–30% w/w drug load. The extrudates (filaments) were characterised using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA). It was confirmed that an amorphous solid dispersion was formed. A temperature profile was developed based on the results from TGA, DSC, and DMA and temperatures used for 3D printing were selected from the profile. The 3D-printed tablets were characterised using DSC, X-ray computer microtomography (XµCT), and X-ray powder diffraction (XRPD). From the DSC and XRPD analysis, it was found that the drug in the 3D-printed tablets (20 and 30% NAP) was amorphous and remained amorphous after 23 weeks of storage (room temperature (RT), 37% relative humidity (RH)). This shows that adjusting the drug ratio can modulate the brittleness and improve printability without compromising the physical stability of the amorphous solid dispersion.

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