RESEARCH OF BUILDING MATERIALS

Using rice straw to manufacture ceramic bricks

Vestnik MGSU 11/2014
  • Gorbunov German Ivanovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Department of Technology of Finishing and Insulation Materials, 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 .
  • Rasulov Olimdzhon Rakhmonberdievich - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Technology of Finishing and Insulation Materials, 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 .

Pages 128-136

In the article, the co-authors offer their advanced and efficient methodologies for the recycling of the rice straw, as well as the novel approaches to the ceramic brick quality improvement through the application of the rice straw as the combustible additive and through the formation of amorphous silica in the course of the rice straw combustion. The co-authors provide characteristics of the raw materials, production techniques used to manufacture ceramic bricks, and their basic properties in the article. The co-authors describe the simulated process of formation of amorphous silica. The process in question has two independent steps (or options): 1) rice straw combustion and ash formation outside the oven (in the oxidizing medium), and further application of ash as the additive in the process of burning clay mixtures; 2) adding pre-treated rice straw as the combustible additive into the clay mixture, and its further burning in compliance with the pre-set temperature mode. The findings have proven that the most rational pre-requisite of the rice straw application in the manufacturing of ceramic bricks consists in feeding milled straw into the clay mixture to be followed by molding, drying and burning. Brick samples are highly porous, and they also demonstrate sufficient compressive strength. The co-authors have also identified optimal values of rice straw and ash content in the mixtures under research.

DOI: 10.22227/1997-0935.2014.11.128-136

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COMPOSITE SOLUTIONS IN RAILROAD ENGINEERING

Vestnik MGSU 10/2012
  • Panfilova Marina Ivanovna - Moscow State University of Civil Engineering (MGSU) Candidate of Chemical Sciences, Associate Professor, Department of Physics, 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 .
  • Ustinova Marina Vladimirovna - Moscow State University of Railroad Engineering (MIIT) Senior Lecturer, Department of Safety of the Technosphere, 8 (495) 799-95-50, Moscow State University of Railroad Engineering (MIIT), 22/2 Chasovaya St., Moscow, 125993, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Zubrev Nikolay Ivanovich - Moscow State University of Railroad Engineering (MIIT) Candidate of Technical Sciences, Professor, Department of Safety of the Technosphere, 8 (495) 799-95-50, Moscow State University of Railroad Engineering (MIIT), 22/2 Chasovaya St., Moscow, 125993, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 171 - 177

Present-day methods of recovery of used wooden railway ties, including burial, chemical neutralization, gasification and subsequent burning, utilization in the capacity of composite materials, are expensive and unsafe for the environment. The authors propose a new method of their utilization. Ash generated in the course of their burning may replace a portion of cement in composite solutions and act as an additive to grouting mortars designated for the filling of the annulus space of manifold tunnels. The chemical composition of the ash was identified by the x-ray method applied to three samples taken during various periods of time from out of a dry-type dust collector.
The level of human health/environmental hazard of the ash is based on its chemical composition. Changes in the rheological properties of composite solutions that contained concrete fractions, various ratios of ash, and 5% of liquid glass were studied in the course of the research. The experiments have proven that in the event of replacement of 20% of cement by ash, the strength of the composite solution is approximately the same as the one of the benchmark sample; therefore, this ash content ratio is deemed acceptable. The finding demonstrate that the ash has no toxic effect, and the ecological safety of this solution is thus confirmed. The authors have proven that 20% of cement may be replaced by the ash generated in the course of burning of waste railway ties.

DOI: 10.22227/1997-0935.2012.10.171 - 177

References
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SYNTHESIS OF STRUCTURES OF CELLULAR-CONCRETE COMPOSITES WITH NANOSIZED COMPONENTS

Vestnik MGSU 7/2017 Volume 12
  • Solonina Valentina Anatol'yevna - Industrial University of Tyumen (TIU) Candidate of Technical Sciences, Associate Professor, Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.
  • Zimakova Galina Alexandrovna - Industrial University of Tyumen (TIU) Candidate of Technical Sciences, Associate Professor, Head of the Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.
  • Baianov Dmitriy Sergeevich - Industrial University of Tyumen (TIU) Post-graduate Student, Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.
  • Sharko Pavel Valer'evich - Industrial University of Tyumen (TIU) Master`s Degree Student, Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.
  • Zelig Marina Petrovna - Industrial University of Tyumen (TIU) Senior Lecturer, Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.

Pages 733-740

The article reveals the results of one of the stages of the integrated research studying the influence of compounds and disperse characteristics of silica-containing materials on structure formation and qualities of cellular concrete. It has been indicated that the improvement of physical and mechanical properties of cellular concrete can be achieved through creating the best possible pore structure of the concrete and the structure of interporous frame as well as intensification of hydration and crystallization processes under hydrothermal treatment and, as a result, the increase in number and perfecting morphology of hydrated phases. Up-to-date knowledge about the structure and properties of cellular concrete shows potential capacities to enlarge strength characteristics through forming a nanopore structure of a matrix stone, the effective usage of power potential of multicomponent binding including Portland cement, high-calcium lime, activate silica components with grains of submicron and nanometer range.

DOI: 10.22227/1997-0935.2017.7.733-740

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