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RESEARCH OF BUILDING MATERIALS

Influence of disperse particles on the modulus of elasticity of polymer blends

Vestnik MGSU 8/2014
  • Matseevich Tat’yana Anatol’evna - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Physical and Mathematical Sciences, Associate Professor, Department of Higher Mathematics, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Popova Marina Nikolaevna - Moscow State University of Civil Engineering (MGSU) Doctor of Chemical Sciences, Associate Professor, Department of Composite Materials Technology and Applied Chemistry, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Volodina Aleksandra Evgen’evna - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Composite Materials Technology and Applied Chemistry, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Askadskiy Andrey Aleksandrovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Chemical Sciences, Professor, Department of Composite Materials Technology and Applied Chemistry, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 73-90

The article considers various calculation methods for estimating modulus of elasticity depending on mixing formula. These dependencies can have different curvatures, showing that the modulus of elasticity of the blends can exceed the average values for different blends. The authors made a dynamic mechanical analysis of incompatible blends of polydimethylsiloxane and polyisoprene, the measured temperature dependence of modules accumulation and loss [3]. They detected two relaxation mechanisms, which can be suppressed by using computerization representing the diblock copolymers of the same components. The possibility of calculating elasticity modulus is presented for different situations: the dispersion of solid polymer in the viscoelastic matrix, dispersion of solid polymer 1 in solid polymer 2; dispersion of solid partially crystalline polymer in solid polymer 2. The dependence of the modulus of elasticity on molar and volume fraction have different forms, depending on Van der Waal component volume, the molecular weight of the recurring units, component density, domain volume, etc. The very form of the dependency is determined by the physical state (rubber elasticity polymer, crystalline polymer, solid amorphous polymer) of the blend components.

DOI: 10.22227/1997-0935.2014.8.73-90

References
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PROSPECTS OF POTENTIAL APPLICATION OF NON-METALLIC FRP REINFORCEMENT IN FRP-REINFORCED CONCRETE COMPRESSIVE MEMBERS AS MAIN LONGITUDINAL NON-PRESTRESSED REINFORCEMENT

Vestnik MGSU 10/2015
  • Lapshinov Andrey Evgenievich - Moscow State University of Civil Engineering (National Research University) (MGSU) postgraduate student, Assistant Lecturer, Department of Reinforced Concrete and Masonry Structures, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 96-105

In the foreign countries there exist not only design guidelines but also standards for testing of FRP materials. These codes do not recommend using FRP bars in compressive members, such as columns. But the compressive strength shouldn’t be neglected according to those design codes. In our country the standards for FRP testing and design codes are just in the process of development. This paper contains the analysis results of the possibility of GFRP bars use as the main longitudinal reinforcement in compressive members. The most recent research data on this subject is presented. The studies show that the strength of the specimens grow rapidly with the decreasing tie spacing in columns. We can also make a conclusion that the GFRP bars contribution is only 5 % lower than the contribution of traditional steel bars. Some other research data shows that in case of the tie spacing close to the design codes limitations there is no strength increase in the same specimens made of plain concrete.

DOI: 10.22227/1997-0935.2015.10.96-105

References
  1. Tamrazyan A.G. Beton i zhelezobeton — vzglyad v budushchee [Concrete and Reinforced Concrete — Glance at Future]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2014, no. 4, pp. 181—189. (In Russian)
  2. Tamrazyan A.G., Filimonova E.A. Struktura tselevoy funktsii pri optimizatsii zhelezobetonnykh plit s uchetom konstruktsionnoy bezopasnosti [Structure of Efficiency Function during Optimization of Reinforced Concrete Slabs with Account for Structural Safety]. Promyshlennoe i grazhdanskoe stroitel’stvo [Industrial and Civil Engineering]. 2013, no. 9, pp. 14—15. (In Russian)
  3. Tamrazyan A.G., Filimonova E.A. Metod poiska rezerva nesushchey sposobnosti zhelezobetonnykh plit perekrytiy [Method of Searching the Bearing Capacity Reserve for Reinforced Concrete Slabs]. Promyshlennoe i grazhdanskoe stroitel’stvo [Industrial and Civil Engineering]. 2011, no. 3, pp. 23—25. (In Russian)
  4. SP 63.13330.2012. Betonnye i zhelezobetonnye konstruktsii. Osnovnye polozheniya. Aktualizirovannaya redaktsiya SNiP 52-01—2003 [Requirements SP 63.13330.2012. Concrete and Reinforced Concrete Structures. Fundamental Principles. Revised Edition of Construction Norms SNiP 52-01—2003]. Moscow, Minregion Rossii Publ., 2012, 161 p. (In Russian)
  5. Riskind B.Ya. Prochnost’ szhatykh zhelezobetonnykh stoek s termicheski uprochnennoy armaturoy [Reliability of Compressed Reinforced Concrete Poles with Thermally Strengthened Reinforcement]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 1972, no. 11, pp. 31—33. (In Russian)
  6. Khait I.G., Chistyakov E.A. Primenenie vysokoprochnoy armatury v kolonnakh mnogoetazhnykh zdaniy [Application of High-Tensile Reinforcement in the Piles of Multistory Buildings]. Nauchno-tekhnicheskiy referat : VTsNIS [Scientific Technical Report : VTsNIS]. Moscow, Stroyizdat Publ., 1979, Series 8, no. 10, pp. 36—42. (In Russian)
  7. Beysembaev M.K. Prochnost’ szhatykh zhelezobetonnykh elementov s vysokoprochnoy nenapryagaemoy armaturoy : dissertatsiya na soiskanie uchenoy stepeni kandidata tekhnicheskikh nauk [Stability of Compressed Reinforced Concrete Elements with High-Tensile Nontensional Reinforcement]. Moscow, NIIZhB Publ., 1991, 154 p. (In Russian)
  8. ACI 440.1R—15. Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars. ACI Committee 440, American Concrete Institute, Farmington Hills, Mich., 2015, 83 p.
  9. CAN/CSA-S6-02. Design and Construction of Building Components with Fibre-Reinforced Polymers, CAN/CSA S806-02. Canadian Standards Association, Rexdale, Ontario, Canada, 2002, 177 p.
  10. CNR-DT 203/2006. Istruzioni per la Progettazione, l’Esecuzione e il Controllo di Strutture di Calcestruzzo armato con Barre di Materiale Composito Fibrorinforzato. Rome, CNR, 2007, 42 p. (In Italian)
  11. Fib Bulletin #40. FRP Reinforcement in RC Structures. 147 p.
  12. Machida A., editor. Recommendation for Design and Construction of Concrete Structures Using Continuous Fiber Reinforcing Materials. Japan Society of Civil Engineers (JSCE). Concrete Engineering Series No. 23, 1997, 325 p.
  13. ASTM D695—10. Standard Test Method for Compressive Properties of Rigid Plastics. ASTM, 2010, 7 p.
  14. Lapshinov A.E. Issledovanie raboty SPA i BPA na szhatie [The Experimental Research of GFRP and BFRP Operation under Compression]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2014, no. 1, pp. 52—57. (In Russian)
  15. Blaznov A.N., Savin V.F., Volkov Yu.P., Tikhonov V.B. Issledovanie prochnosti i ustoychivosti odnonapravlennykh stekloplastikovykh sterzhney pri osevom szhatii [Examining Strength and Stability of Monodirectional Glass Fiber Rods under Axial Compression]. Mekhanika kompozitsionnykh materialov i konstruktsiy [Mechanics of Composite Materials and Structures]. 2007, vol. 13, no. 3, pp. 426—440. (In Russian)
  16. GOST 31938—2012. Armatura kompozitnaya polimernaya dlya armirovaniya betonnykh konstruktsiy. Obshchie tekhnicheskie usloviya [Russian State Standard GOST 31938—2012. Composite Polymer Reinforcement for Reinforcing Concrete Structures. Main Technical Conditions]. Moscow, Standartinform Publ., 2014, 38 p. (In Russian)
  17. GOST 4651—82 (ST SEV 2896—81). Plastmassy. Metod ispytaniya na szhatie [Russian State Standard 4651—82 (ST SEV 2896-81). Plastic. Compression Test Method]. Moscow, Izd standartov Publ., 1998, 8 p. (In Russian)
  18. Lapshinov A.E., Madatyan S.A. Kolonny, armirovannye stekloplastikovoy i bazal’toplastikovoy armaturoy [Colums, Reinforcing with Fiberglass and BFRP Reinforcement]. Beton i zhelezobeton — vzglyad v budushchee : sbornik trudov II Mezhdunarodnoy, III Vserossiyskoy konferentsii po betonu i zhelezobetonu (g. Moskva, 12—16 maya 2014 g.) [Concrete and Reinforced Concrete — Glance into Future : Collection of the Materials of the 2nd International, 3rd All-Russian Conference on Concrete and Reinforced Concrete (Moscow, May 12—16, 2014)]. Moscow, 2014, vol. III, pp. 67—77. (In Russian)
  19. Afifi M.Z., Mohamed H., Benmokrane B. Axial Capacity of Circular Concrete Columns Reinforced with GFRP Bars and Spirals. Journal of Composites for Construction. 2014, vol. 18 (1). Available at: http://www.researchgate.net/publication/260081219_Axial_Capacity_of_Circular_Concrete_Columns_Reinforced_with_GFRP_Bars_and_Spirals. Date of access: 02.06.2015. DOI: http://dx.doi.org/10.1061/(ASCE)CC.1943-5614.0000438.
  20. Hany Tobbi, Ahmed Sabry Farghaly, Brahim Benmokrane. Concrete Columns Reinforced Longitudinally and Transversally with Glass Fiber-Reinforced Polymer Bars. ACI Structural Journal. July—August 2012, vol. 109 (4). Available at: http://www.researchgate.net/publication/260389101_Concrete_Columns_Reinforced_Longitudinally_and_Transversally_with_Glass_Fiber-Reinforced_Polymer_Bars. Date of access: 02.06.2015.
  21. Choo C.C., Harik I.E., Gesund H. Concrete Columns Reinforced with FRP Bars: Extending the Life of RC Structures. 34th Conference on Our World in Concrete & Structures. Singapore, 16—18 August 2009, pp. 15—22.
  22. De Luca A., Matta F., Nanni A. Behavior of Full-Scale Concrete Columns Internally Reinforced with Glass FRP Bars Under Pure Axial Load. Composites & Polycon 2009. American Composites Manufacturers Association January 15—17, 2009 Tampa, FL USA. Available at: http://www.bpcomposites.com/wp-content/uploads/2012/08/behavior_of_fullscale_concrete_columns_internally_reinforced_with_glass_frp_bars_under_pure.pdf. Date of access: 02.06.2015.
  23. Deiveegan A., Kumaran G. Reliability Study of Concrete Columns Internally Reinforced with Non¬Metallic Reinforcements. Int. Journal of Civil and Structural Eng. 2010, vol. 1, no. 3, pp. 270—287.
  24. Golovin N.G., Pakhratdinov A.A. Prochnost’ szhatykh zhelezobetonnykh elementov, izgotovlennykh na shchebne iz betona [Reliability of Compressed Reinforced Concrete Elements Produced on Gravel of Concrete]. Stroitel’stvo i rekonstruktsiya [Construction and Reconstruction]. 2014, pp. 101—106. (In Russian)

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Сalculation theory for shrinkage stresses in cellular concrete wall panels in carbonation processes with account of creep

Vestnik MGSU 12/2016
  • Bataev Dena Kerim-Sultanovich - Complex Institute named after Kh.I. Ibragimov of the Russian Academy of Sciences (CI RAS) Doctor of Engineering, professor, academician of the Academy of Sciences of the Chechen Republic, director, Complex Institute named after Kh.I. Ibragimov of the Russian Academy of Sciences (CI RAS), 21a Staropromyslovsky shosse, Grozny, 364051, Chechen Republic.
  • Gaziev Minkail Akhmetovich - Grozny State Technological Oil University named after Academician M.D. Millionshchikov (GSTOU named after Academician M.D. Millionshchikov) Candidate of Engineering, associate professor of the building structures department, Grozny State Technological Oil University named after Academician M.D. Millionshchikov (GSTOU named after Academician M.D. Millionshchikov), 100 Ordzhonikidze square, Grozny, 364051, Chechen Republic.
  • Pinsker Vadim Aronovich - Centre for cellular concretes at NP “North-West Construction Chamber” Candidate of Engineering, scientific adviser, Centre for cellular concretes at NP “North-West Construction Chamber”, off. 308, 1/3 Zodchego Rossi str., Saint-Petersburg, 191023; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Chepurnenko Anton Sergeevich - Don State Technical University (DGTU) Candidate of Engineering Science, teaching assistant of the strength of materials department, Don State Technical University (DGTU), 162 Sotsialisticheskaya str., Rostov-on-Don, 344022; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 11-22

The task of comprehensive analysis presented in this article is a development of theory of calculation of shrinkage stresses in cellular concrete wall panels; such stresses occur due to carbonation of concrete because of the creep of material. Analytical dependences characterizing the influence of carbonation on the modulus of elasticity, shrinkage and creep of autoclaved cellular concrete, as well as the regularity of variation of carbonation degree as per thickness of the wall panels depending on time, were obtained. The proposed theory of calculation of shrinkage stresses in cellular concrete wall panels, with account of concrete creep, makes it possible to predict the influence of carbonation processes on crack resistance thereof, and thus to develop measures of technological and structural nature, in order to improve their operational reliability and durability.

DOI: 10.22227/1997-0935.2016.12.11-22

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