RESEARCH OF BUILDING MATERIALS

Investigation of bioresistant dry building mixes modified by carbon nanotubes

Vestnik MGSU 4/2015
  • Suraeva Ekaterina Nikolaevna - Ogarev Mordovia State University (Ogarev MSU) external degree-seeking student, Department of Construction Materials and Technologies, Ogarev Mordovia State University (Ogarev MSU), 68 Bolshevistskaya Str., Saransk 430005, Republic of Mordovia, Russian Federation; +7 (8342) 47-40-19; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Erofeev Vladimir Trofimovich - Ogarev Mordovia State University (MGU im. Ogareva) Doctor of Technical Sciences, Professor, Chair, Department of Construction Materials and Technologies, dean, Department of Architecture and Construction, Ogarev Mordovia State University (MGU im. Ogareva), 68 Bol’shevistskaya str., Saransk, 430005, Russian Federation; +7 (8342) 47-40-19; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Korolev Evgeniy Valer'evich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Adviser, Russian Academy of Architectural and Building Sciences (RAACS), director, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7-499-188-04-00; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 104-114

Dry construction mixes are today a product of high technologies. Depending on the purpose and requirements to the properties it is easy to produce dry construction mixes with different compositions and operating indicators in plant conditions using the necessary modifying additives. Cement, gypsum and other mineral binders are used in the construction mixes. Different types of cement are more heavily used in dry construction mixes. Such dry mixes are believed to be more effective materials comparing to traditional cement-sandy solutions of centralized preparation. The authors present the results of the investigations on obtaining biocidal cement-sand compositions. It was established, that introduction of sodium sulfate into the composition provides obtaining the materials with funginert and fungicide properties. The strength properties of the mixes modified by carbon nanotubes and biocide additive were investigated by mathematical planning methods. The results of the investigations showed that the modification of cement stone structure by carbon nanotubes positively influences their strength and technological properties. Nanomodifying of construction composites by introducing carbon nanotubes may be effectively used at different stages of structure formation of a construction material.

DOI: 10.22227/1997-0935.2015.4.104-114

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MODEL AND MECHANISM OF CARBON NANOTUBE STABILIZATION WITH PLASTICIZER BASED ON POLYCARBOXYLATE

Vestnik MGSU 7/2017 Volume 12
  • Samchenko Svetlana Vasilevna - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, Department of Technologies of Cohesive Materials and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Zemskova Olga Viktorovna - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Chemical Sciences, Associate Professor, Department of Technologies of Cohesive Materials and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Kozlova Irina Vasilevna - Moscow State University of Civil Engineering (National Research University) (MGSU) Postgraduate student, Department of Technologies of Cohesive Materials and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 724-732

The method for adding into the cement matrix composition the carbon nanotubes (CNTs) in the form of stabilized suspensions for their even allocation in its volume is observed in this article. The aim of the article is to study the aggregative and sedimentary stability of the CNTs suspensions in the presence of the plasticizer based on polycarboxylate under the ultrasonic effect, to determine the kinetic addictions of coagulation, to describe the suspension stabilization models and mechanisms according to the modern theory and to determine the possibility of using CNTs as suspensions for portland cement modification. The object of research is Portland cement, CNts and polycarboxylate-based plasticizer. Mechanism of stabilization of the CNT water suspension with polycarboxylate based plasticizer due to fixing plasticizer functional groups on the nanoparticle surface is proposed. The non-polar part of the plasticizer provides the formation of high-viscosity streak between the CNTs particles and the dispersion medium, and the polar part provides the formation of the double electrical layer (DEL), which supports the formation of the CNT micelle. The Model of the CNT micelle is described. It is established that the ultrasonic dispersion provides the stability of the CNTs suspensions for seven days and more. It is shown that when the stabilized polycarboxylate-based plasticizers of the CNT are introduced in the form of suspensions into the cement paste composition, they are evenly distributed in the volume of the cement system. This causes the production of cement stone with enhanced exploitative properties.

DOI: 10.22227/1997-0935.2017.7.724-732

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WOOD-POLYMER NANO-MODIFIED POLYVINYLCHLORIDE COMPOSITE BUILDING MATERIALS

Vestnik MGSU 4/2018 Volume 13
  • Abdrakhmanova Lyaylya Abdullovna - Kazan State University of Architecture and Engineering (KSUAE) Doctor of Technical Sciences, Professor, Professor of the Department of Construction Materials Technology, Products and Structures, Kazan State University of Architecture and Engineering (KSUAE), 1 Zelenaya str., Kazan, 420043, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Khantimirov Ayaz Gabdrashitovich - Kazan State University of Architecture and Engineering (KSUAE) Master student, Department of Technology of Construction Materials, Products and Structures, Kazan State University of Architecture and Engineering (KSUAE), 1 Zelenaya str., Kazan, 420043, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Nizamov Rashit Kurbangalievich - Kazan State University of Architecture and Engineering (KSUAE) Doctor of Technical Sciences, Rector, Professor of the Department of Construction Materials, Products and Structures Technology, Kazan State University of Architecture and Engineering (KSUAE), 1 Zelenaya str., Kazan, 420043, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Khozin Vadim Grigor'evich - Kazan State University of Architecture and Engineering (KSUAE) Doctor of Technical Sciences, Professor, Head of the Department of Construction Materials, Products and Structures Technology, Kazan State University of Architecture and Engineering (KSUAE), 1 Zelenaya str., Kazan, 420043, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 426-434

Subject: questions of nano-modification of polyvinylchloride (PVC) composites filled with wood flour (WF) are considered. The wood-filled polyvinylchloride composites developed to date possess high operational parameters but have a significant technological disadvantage (high viscosity of melts), which limits their processing and use. To increase the compatibility of polyvinylchloride and wood flour, experimental studies were conducted on the use of small doses of carbon nanotubes as effective binding agents. Research objectives: investigation of the structure and properties of highly filled nano-modified polyvinylchloride composites. Materials and methods: basic wood-filled polyvinylchloride composites are considered for production of molding profiles, in which single-walled carbon nanotubes in various dispersion media were used as modifiers. We used standard physical and mechanical methods for polymer material properties estimation, as well as a set of methods for analyzing the structure of materials, in particular optical and electronic microscopy. Results: the ranges of optimal concentrations of carbon nanotubes in the composites are determined experimentally, depending on the degree of filling with the wood flour, type and nature of carbon nanotube carrier medium, as well as the method of mixing the components in the process of molding the products by the developed prescriptions. Conclusions: experiments have confirmed technical effectiveness of using nanotubes as additives that enhance the adhesion interaction at the boundary of the polymer with the wood flour. The obtained functional dependencies can be the basis for practical realization of production of molding profiles by extrusion method.

DOI: 10.22227/1997-0935.2018.4.426-434

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