RESEARCH OF BUILDING MATERIALS

STUDY OF CORROSION RESISTANCE OF MODIFIED CONCRETEIN THE SEWAGE MEDIUM

Vestnik MGSU 2/2013
  • Koroleva Elena Leonidovna - Bryansk State Academy of Engineering Technology (BSAET) Candidate of Technical Sciences, Associate Professor, Department of Production of Building Structures, Bryansk State Academy of Engineering Technology (BSAET), 3 prospekt St. Dimitrova, 241037, Bryansk, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Matveeva Elena Gennad’evna - Bryansk State Academy of Engineering Technology (BSAET) Candidate of Technical Sciences, assistant lecturer, Department of Production of Building Structures, Bryansk State Academy of Engineering Technology (BSAET), 3 prospekt St. Dimitrova, 241037, Bryansk, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Naumenko Ol’ga Viktorovna - Bryansk State Academy of Engineering Technology (BSAET) student, Bryansk State Academy of Engineering Technology (BSAET), 3 prospekt St. Dimitrova, 241037, Bryansk, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Nyrikova Tat’yana Nikolaevna - Bryansk State Academy of Engineering Technology (BSAET) student, Bryansk State Academy of Engineering Technology (BSAET), 3 prospekt St. Dimitrova, 241037, Bryansk, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 101-107

The objective of the research project was to design multi-component concrete with an optimized pore structure designated for sewage water treatment facilities. It was followed by the study of their stability in aggressive environments. Measurement of mesopores and macropores with diameters of 0.0055 to 360 mcm was taken using AutoPore IV 9500 porosimeter. X-ray analysis of samples was performed using diffractometer ARL X’TRA produced by Thermo Scientific (Switzerland). Modified 28-day concrete cubes were exposed to aggressive environments for 1 year at low (+4 ± 2 °C) and high temperatures (+20 ± 2 °C) to identify their linear deformation characteristics. Compressive strength of samples was tested upon completion of each three-month period.The authors have found out that degradation of concrete samples in the corrosive environment of waste waters accompanied by generation of thaumasite is less intensive than that in the waste waters that have ettringite generated. Thus, the authors have discovered that the lower the temperature of the aggressive environment of the waste water, the more intensive the formation of ettringite that causes destruction of the concrete. Optimization of the concrete structure is attained through the optimization of the concrete composition. Application of fine-grained silica causes generation of concrete that is highly resistant to the aggressive effects of sulfates and chlorides.

DOI: 10.22227/1997-0935.2013.2.101-107

References
  1. Moskvin V.M., Ivanov F.M., Alekseev S.N., Guzeev E.A. Korroziya betona i zhelezobetona, metody ikh zashchity [Corrosion of Concrete and Reinforced Concrete; Methods of Their Protection]. Moscow, Stroyizdat Publ., 1980.
  2. Clark L. Thaumasite Form of Sulfate Attack. Concrete International. Vol. 22, no. 2, February 1999, pp. 37—40.
  3. Zhukov Yu. A. Vliyanie gidrookisi kal’tsiya na razvitie destruktivnykh protsessov v betone pri shchelochnoy korrozii [Influence of Calcium Hydroxide onto Development of Degenerative Processes in the Concrete Exposed to Alkaline Corrosion]. Leningrad, LIIZhT Publ., 1972, 19 p.
  4. Stark J. Alkali-Kiesels?ure-Reaktion. F.A. Finqer Institute f?r Baustoffkunde, 2008, 139 p.
  5. Stanton T. E. Expansion of Concrete through Reaction between Cement and Aggregate. Proc., Amer. Soc. Civ. Eng., 1940, pp. 1781—1811.
  6. Collepardi M. Damage by Delayed Ettringite Formation — a Holistic Approach and New Hypothesis. Concrete International. Vol. 21, no. 1, January 1999, pp. 69—74.
  7. Shtark Y., Bol’mann K., Zayfart K. Yavlyaetsya li ettringit prichinoy razrusheniya betona? [Is Ettringrite the Reason for Concrete Destruction?] Tsement i ego primenenie [Cement and Its Application]. 1998, no. 2, pp. 13—22.
  8. Bazanov S.M. Mekhanizm razrusheniya betona pri vozdeystvii sul’fatov [Pattern of Concrete Destruction in the Event of Exposure to Sulfates]. Stroitel’nye materialy [Construction Materials]. 2004, no. 9, pp. 46—48.
  9. Stanton T.E. Influence of Cement and Aggregate on Concrete Expansion. Engineering News Record, Feb., no. 1, 1940.
  10. Midness S., Young J.F., Darwin D. Concrete. Prentice Hall, Upper Saddle River, NJ, 2002, pp. 142—154.

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Effect of quartz powder and mineral admixtures on the properties of high-performance concrete

Vestnik MGSU 1/2019 Volume 14
  • Nguyen Duc Vinh Quang - Moscow State University of Civil Engineering (National Research University) (MGSU) Postgraduate student of Department of Technologies of Cohesive Materials and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Bazhenov Yuriy M. - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, Head of the Department of Technologies of Cohesive Materials and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Aleksandrova Olga V. - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Associate Professor, Associate Professor of Department of Technologies of Cohesive Materials and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 102-117

Introduction. This study focuses on the use of silica fume partially replacing cement with 0, 5, 7.5, 10, 12.5 and 30 % constant replacement of fly ash by weight of cement in concrete. Concrete is probably the most extensively used construction material in the world. But the conventional concrete is losing its uses with time and high-performance concrete (HPC) is taking that place. HPC has superior mechanical properties and durability to normal strength concrete. Because of, the microstructure of HPC is more homogeneous than that of normal concrete (NC) due to the physical and chemical contribution of the mineral admixtures as well as it is less porous due to reduced w/c ratio with the addition of a superplasticizer. The inclusion of additives helped in improving the properties of concrete mixes due to the additional reduction in porosity of cement paste and improving the particle packing in the interfacial transition zone (between cement paste and the aggregates).In this experimental investigation the behavior of HPC with silica fume and fly ash with and without quartz powder were studied. The water-binder ratio was kept 0.3 and 20 % quartz flour as partial replacement of fine aggregate for all cases. Materials and methods. Used materials in Vietnam, as follow, Sulfate-resisting Portland cement - PCSR40 (type V) of company Luks Cement (Vietnam) Limited was used in the work. Crushed granite of fraction 9.5…20 mm - as coarse aggregate, Natural sand from Huong river of 0.15…2.5 mm fraction with the fineness modulus of about 3.0 and quartz powder with an average particle size of 5…10 μm were used as fillers; Sika® Viscocrete®-151 is a superplasticizer based on a blend of 3rd generation PCE polymers was used as a plasticizing admixture. The flg ash from Pha Lai thermal power plant and Sika silica Sikacrete® PP1 (particle size < 0.1 μm) was used as a mineral active admixture. The study of strength and technological properties of high-performance concrete was performed by using standard methods. Results. Established by icate that, the workability and strength increase at a certain level and after that, they decline with further increase in the replacement level of silica fume is 12.5 %, on the basis of 30 % FA replacement, the incorporation of 10 % SF showed equivalent or higher mechanical properties and durability compared to the reference samples. Conclusions. HPC consists of mineral admixtures such as silica fume and fly ash use combine quartz powder and superplasticizer helped in improving the strength and durability of concrete mixes due to the additional reduction in porosity of cement paste and an improved interface between it and the aggregate. With 30 % fly ash is optimum dosage used to replacement of cement, incorporation 10 % SF (by weight) and combine of partial replacement of fine aggregate by 20 % quartz powder. On the other hand, a few mathematical equations can be used to derive the durability properties of concrete based on its compressive strength.

DOI: 10.22227/1997-0935.2019.1.102-117

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