IMPACT OF VARIOUS ADDITIVES ONTO MORPHOLOGY OF GYPSUM CRYSTALS

Vestnik MGSU 4/2012
  • Ustinova Yuliya Valer'evna - Moscow State University of Civil Engineering (MSUCE) +7 (499) 183-32-92, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Sivkov Sergey Pavlovich - D. Mendeleyev University of Chemical Technology of Russia (MUCTR) 8 (495) 496-92-38, D. Mendeleyev University of Chemical Technology of Russia (MUCTR), 20 Geroev Panfilovtsev str., Moscow, 125047, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Barinova Ol'ga Pavlovna - D. Mendeleyev University of Chemical Technology of Russia (MUCTR) +7 (495) 496-93-40, D. Mendeleyev University of Chemical Technology of Russia (MUCTR), 20 Geroev Panfilovtsev str., Moscow, 125047, Russian Federation; opbar@rambler.ru; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Sanzharovskiy Aleksandr Yur'evich - D. Mendeleyev University of Chemical Technology of Russia (MUCTR) +7 (495) 496-93-40, D. Mendeleyev University of Chemical Technology of Russia (MUCTR), 20 Geroev Panfilovtsev str., Moscow, 125047, Russian Federation.

Pages 140 - 144

Nowadays, functional additives represented by multiple classes of substances and compounds, including polymers of different origin, are available for introduction into dry mixtures based on gypsum binders. However, their impact onto the growth and formation of calcium sulfate dihydrate (CaSO∙2HO) crystals generated in the course of hardening of gypsum binders is not quite clear. Therefore, the objective of the research was to analyze the processes of growth and formation of calcium sulfate dihydrate crystals caused by functional additives based on polymers of different origin. The analysis was composed of three stages.
At the first stage, both pure and modified calcium sulfate dihydrate crystals were synthesized. Super plasticizers based on sulfonated melamine-formaldehyde resin, methylcellulose (MC) and redispersible polymer powder based on copolymer of vinyl acetate, ethylene and vinyl chloride (VAEVC) were applied as additives. At the second stage, the objective was to identify the influence of polymer additives on the shape and size of calcium sulfate dihydrate crystals; therefore, an X-ray analysis of synthesized crystals was performed. Following the X-ray analysis data and with the help of a special software programme, possible combinations of simple forms of CaSO∙2HO were simulated, and the habitus of generated crystals was also studied. At the third stage, the objective was to validate the models of calcium sulfate dihydrate crystals by means of an electron-microscopic analysis.
The following conclusions were made upon completion of the research:
A. It has been identified that additives based on polymers of different origin affect the processes of crystallization, the size and shape of gypsum crystals. The presence of the super plasticizer based on sulfonated melamine-formaldehyde resin, methylcellulose and redispersible polymer powder based on a copolymer of vinyl acetate, ethylene and vinyl chloride, causes reduction of the size of crystals, while the crystals turn elongated. The crystal-to-crystal contact area increases; therefore, it is likely that the strength of the hardening agent goes up.
B. It has been demonstrated that the X-ray analysis can be applied to simulate the shape and habitus of crystals.

DOI: 10.22227/1997-0935.2012.4.140 - 144

References
  1. Korneev V.I., Zozulya P.V., Medvedeva I.N., Bogoyavlenskaya G.A., Nuzhdina N.I. Retsepturnyy spravochnik po sukhim stroitel'nym smesyam [Book of References and Recipes of Dry Building Mixtures]. St. Petersburg, Kvintet Publ., 2010, 308 p.
  2. Izotov V.S. Khimicheskie dobavki dlya modifikatsii betona [Chemical Additives to Modify the Concrete]. Moscow, Paleotip Publ., 2006, 244 p.
  3. Mishra R.K., Flatt R.J., Heinz H. Molecular Understanding of Directional Surface and Interface Tensions of Gypsum and Calcium Sulfate Hemihydrate. Proceedings of the XIII ICCC International Congress on the Chemistry of Cement, Madrid, Spain, 3-8 July, 2011.
  4. Kristallograficheskaya i kristallokhimicheskaya baza dannykh dlya mineralov i ikh struk-turnykh analogov [Crystallographic and crystal-chemical database of minerals and their structural counterparts]. Available at: http://database.iem.ac.ru/mincryst/rus. Date of access: 04.02.2012.

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STUDY OF CRYSTALLIZATION OF CALCIUM SULFATE DIHYDRATE THAT HAS POLYMER ADDITIVES

Vestnik MGSU 7/2012
  • Ustinova Yuliya Valer'evna - Moscow State University of Civil Engineering (MSUCE) +7 (499) 183-32-92, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Sivkov Sergey Pavlovich - D. Mendeleyev University of Chemical Technology of Russia (MUCTR) 8 (495) 496-92-38, D. Mendeleyev University of Chemical Technology of Russia (MUCTR), 20 Geroev Panfilovtsev str., Moscow, 125047, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Aleksashin Valeriy Mikhaylovich - All- Russian Scientific Research Institute of Aviation Materials Candidate of Technical Sciences, Senior Researcher, +7 (499) 263-89-02, All- Russian Scientific Research Institute of Aviation Materials, 7 Radio St., Moscow, 105005, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 130 - 135

Currently, functional additives represented by many classes of substances and compounds, including polymers of different origin, are widely used in the production of dry mixtures based on gypsum binders. However, the impact of these additives produced on the formation of calcium sulfate dihydrate (CaSO42H2O) crystals in the course of the hardening of gypsum binders, is not quite clear. Therefore, the research is aimed at the clarification of the processes of growth and formation of calcium sulfate dihydrate crystals in the presence of functional additives based on polymers of different origin. The research is composed of the following stages.
At the first stage, calcium sulfate dihydrate crystals were synthesized both in the pure form and with additives. The additives included super plasticizers based on sulfonated melamine-formaldehyde resin (SMF), methylcellulose (MC) and polymer powder based on copolymer of vinyl acetate, ethylene and vinyl chloride (VAEVC). At the second stage, X-ray analysis of the synthesized crystals was performed to identify potential patterns of influence produced by polymer additives onto the shape and size of calcium sulfate dihydrate crystals. At the third stage, thermal analysis and electron microscopy methods were applied to synthesized crystals.
The research suggests the following conclusions:
A. It is identified that additives based on polymers of different origin affect processes of crystallization, the size and shape of crystals.
B. The X-ray diffraction analysis has proven that molecules of polymer additives do not penetrate into the gypsum structure and the chemical composition of the product does not change.
C. Methods of thermal analysis have proven that the introduction of polymer additives does not produce any adverse impact on the stability of gypsum crystals, if exposed to temperature fluctuations.
D. The major impact produced onto crystallization is the one of the super plasticizer based on the sulfonated melamine-formaldehyde resin.

DOI: 10.22227/1997-0935.2012.7.130 - 135

References
  1. Korneev V.I., Zozulya P.V., Medvedeva I.N. Retsepturnyy spravochnik po sukhim stroitel’nym smesyam [Cookbook of Dry Building Mixtures]. St. Petersburg, 2010, RIA Kvintet Publ., 308 p.
  2. Izotov V.S. Khimicheskie dobavki dlya modifikatsii betona [Chemical Additives to Modify Concrete]. Moscow, Paleotip Publ., 2006, 244 p.
  3. Batrakov V.G. Modifitsirovannye betony. Teoriya i praktika [Modified Concretes. Theory and Practice]. Moscow, 1998, 768 p.
  4. Mishra R. K., Flatt R. J., Heinz H. Molecular Understanding of Directional Surface and Interface Tensions of Gypsum and Calcium Sulfate Hemihydrate. Proceedings of the XIII ICCC International Congress on the Chemistry of Cement. Madrid, Spain, 3-8 July, 2011.
  5. Butt Yu.M., Sychev M.M., Timashev V.V. Khimicheskaya tekhnologiya vyazhushchikh materialov [Chemical Technology of Binding Materials]. Moscow, Vyssh. shk. Publ.,1980, 472 p.

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PRODUCTION ECOLOGICALLY OF SAFE BUILD MATERIALS ON BASIS OF PEAT AND GYPSUM

Vestnik MGSU 1/2012
  • Guyumdzhjan Perch Pogosovich - Ivanovo Institute of State Fire Fighting Service of Emergency Control Ministry of Russia Doctor of Technical Sciences, Ivanovo Institute of State Fire Fighting Service of Emergency Control Ministry of Russia, .
  • Vetrenko Tatjana Grigorjevna - Ivanovo State Architecturally-building University Candidate of Technical Sciences, Associate Professor, Associate Professor of Department of Hydraulics, Water supply and Sanitation +7-(4932)-32-85-40; fax: +7-(4932)-30-00-74, Ivanovo State Architecturally-building University, 20, 8-th March, Ivanovo, 153037, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Vitalova Nina Mihajlovna - Ivanovo State Architecturally-building University Senior teacher of Department of Building Constructions +7-(4932)-38-01-48, Ivanovo State Architecturally-building University, 20, 8-th March, Ivanovo, 153037, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 94 - 99

The study on the creation of composite materials based on peat use-cation gypsum binder with improved thermal characteristics which en-rectifying to apply it during the construction of various buildings.

DOI: 10.22227/1997-0935.2012.1.94 - 99

References
  1. Belkin N.M., Vinogradov G.V., Leonov A.I. Izmerenie vyazkosti i fiziko-mehanicheskih harakteristik materialov. Moscow, Nauka, 1968.
  2. Suvorov V.M. Teploizolyatsionnye materialy na osnove torfa. Tezisy sb. Fiziko-himiya torfa i sapropeley. Materialy XII Mezhdunarodnoy nauchno-tehnicheskoy konferentsii. Tver', 1984.
  3. Hudoverdyan V.M. Metody proektirovaniya sostava torfobetona. Erevan., Izd-vo Arm. SSR, 1950.
  4. Spravochnik po stroitel'nym materialam dlya zavodskih i prostroechnyh laboratoriy Moscow, Gosstrojizdat, 1961.
  5. Romanenkov I.G., Zigel'-Korn V.N. Ognestoykost' stroitel'nyh konstruktsiy i effektivnyh materialov. Moscow, Strojizdat, 1984.
  6. Afanas'ev A.E., Churaev N.V. Optimizacija processov sushki i strukturoobrazovanija v tehnologii torfjanogo proizvodstva. Moscow, Nedra, 1992.

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The influence of plasticizers on the properties of gypsum binders activated in vortex layer apparatus

Vestnik MGSU 3/2019 Volume 14
  • Ibragimov Ruslan A. - Kazan State University of Architecture and Engineering (KSUAE) Candidate of Technical Sciences, Associate Professor, Head of the Department of Technology of building processes, Kazan State University of Architecture and Engineering (KSUAE), 1 Zelenaya st., Kazan, 420043, Russian Federation.
  • Korolev Evgeny V. - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, Vice rector, Moscow State University of Civil Engineering (National Research University) (MGSU), 6 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Deberdeev Timur R. - Kazan National Research Technological University (KNRTU) Doctor of Technical Sciences, Professor, Head of the Department of Technologies for processing polymers and composite materials, Kazan National Research Technological University (KNRTU), 68 Karl Marx st., Kazan, 420015, Russian Federation.

Pages 293-300

Introduction. The article presents the results of a study to determine the influence of introduction method, type and concentration of plasticizing additives on the structure parameters and properties of gypsum stone obtained using gypsum cement treated in a vortex layer apparatus. Materials and methods. The G-5 BII gypsum cement was used for the investigation. The physicomechanical properties of the gypsum stone were determined in accordance with standard procedures, specific surface area was determined by air permeability, X-ray patterns were taken by means of the D2 Phaser diffractometer. Results. The data were obtained from 11 compositions of gypsum binder processed in the vortex layer apparatus and compared with a reference composition in the sense of the specific surface of the binder, mineralogical composition and physicomechanical characteristics of the gypsum stone. Conclusions. As a result of the investigation, it was revealed that the processing of the gypsum binder in the vortex layer apparatus leads to an increase in the specific surface up to 2 times. Modification of gypsum with MF superplasticizer significantly increases the ultimate compression strength (by 323 %) and bending strength (by 218 %) of the gypsum stone, as compared with the initial composition. Meanwhile the combined activation of gypsum with superplasticizers leads to a sharp decrease in strength and a significant slowdown in hydration. The greatest increase in the strength of the gypsum stone is observed when modifying activated gypsum. So, depending on the type of superplasticizer, the compression strength increases by 100 to 302 %, and bending strength by 86 to 218 %. Also this significantly reduces the gypsum stone overall porosity (down to 23 %) and softening coefficient (down to 51%).

DOI: 10.22227/1997-0935.2019.3.293-300

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