HIGH-QUALITY SELF-COMPACTING CONCRETE WITH COAL BURNING WASTE

Vestnik MGSU 12/2017 Volume 12
  • Bazhenov Yuriy Mikhaylovich - 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.
  • Voronin Viktor Valerianovich - 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, 129337, Russian Federation.
  • Alimov Lev Alekseevich - 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, 129337, Russian Federation.
  • Bakhrakh Anton Mikhaylovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, Professor of the Department of construction of thermal and nuclear power facilities, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, 129337, Russian Federation.
  • Larsen Oksana Aleksandrovna - Moscow State University of Civil Engineering (National Research University) (MGSU) Bachelor, Department of Technologies of Cohesive Materials and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, 129337, Russian Federation.
  • Solov'ev Vitaliy Nikolaevich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, Professor of the Department of Construction of Thermal and Nuclear Power Facilities, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Nguen Dyk Vin Kuang - 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, 129337, Russian Federation.

Pages 1385-1391

Subject: nowadays self-compacting concretes (SCC), the use of which requires no additional compaction, have become widespread for use in densely-reinforced structures and hard-to-reach places. In self-compacting concretes, finely-ground admixtures-microfillers are widely used for controlling technological properties. Their introduction into the concrete mix allows us to obtain more dense structure of concrete. The influence of micro-fillers on water consumption and plasticity of concrete mix, on kinetics of strength gain rate, heat release and corrosion resistance is also noticeable. Research objectives: the work focuses on the development of composition of self-compacting concrete with assigned properties with the use of fly ash based on coal burning waste, optimized with the help of experimental design method in order to clarify the influence of ash and cement quantity, sand size on strength properties. Materials and methods: pure Portland cement CEM I 42.5 N was used as a binder. Crushed granite of fraction 5…20 mm was used as coarse aggregate, coarse quartz sand with the fineness modulus of 2.6 and fine sand with the fineness modulus of 1.4 were used as fillers. A superplasticizer BASF-Master Glenium 115 was used as a plasticizing admixture. The fly ash from Cherepetskaya thermal power plant was used as a filler. The study of strength and technological properties of self-compacting concrete was performed by using standard methods. Results: we obtained three-factor quadratic dependence of strength properties on the content of ash, cement and fraction of fine filler in the mix of fine fillers. Conclusions: introduction of micro-filler admixture based on the fly ash allowed us to obtain a concrete mix with high mobility, fluidity and self-compaction property. The obtained concrete has high strength characteristics, delayed strength gain rate due to replacement of part of the binder with ash. Introduction of the fly ash increases degree of hydration of Portland cement due to the greater water retention capacity, and also contributes to reduction in total capillary porosity of SCC structure.

DOI: 10.22227/1997-0935.2017.12.1385-1391

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POLYMER RESIDUE BASED HYDROPHOBIC-FUNGICIDAL ADDITIVE AND PLASTER DRY MIX BASED ON IT

Vestnik MGSU 6/2017 Volume 12
  • Chikichev Artur Andreevich - Bratsk State University (BrSU) Postgraduate Student, Department of Construction Material Science and Technologies, Bratsk State University (BrSU), 40 Makarenko st., Bratsk, 665709, Russian Federation.
  • Belykh Svetlana Andreevna - Bratsk State University (BrSU) Candidate of Technical Sciences, Associate Professor, Head of the Department of Construction Materials Science and Technologies, Bratsk State University (BrSU), 40 Makarenko st., Bratsk, 665709, Russian Federation.
  • Kudyakov Aleksandr Ivanovich - Tomsk State University of Architecture and Building (TSUAB) Doсtor of Technical Sciences, Professor, Head of the Department of Construction Materials and Technologies, Tomsk State University of Architecture and Building (TSUAB), 2 Solyanaya sq., Tomsk, 634003, Russian Federation.

Pages 661-668

Subject of study is the effect of additives on the structure formation of cement. Improvement of the re-sistance to aggressive media of materials for wet rooms. Objective is to develop a scientifically grounded composition of a plaster dry construction mix with increased water resistance and funginertness, with the use of locally available materials and man-made waste.The study was carried out by standard methods of research using XRF and DTA. The hydrophobic fungicidal additive based on the polymer residue of turpentine production and fly ash with the ratio by weight ZU: PO = 1.15: 1 was developed. It has been established that while adding the de-veloped additive in an amount of 2.5 % of the mass of cement, the rate of hydration of cement minerals and resistibility of the sand-cement mortar decrease in early strength with medium workability concrete mix. This creates conditions for the formation of a dense structure with increased resistance to aggressive envi-ronments.Using new hydrophobic fungicidal additive, a dry plaster mortar for wet rooms has been developed. It has increased water resistance values corresponding to the W8 grade and funginertness especially with respect to A. Niger, the pathogen and widespread decomposer.The additive is effective; it is developed on the basis of industrial wastes and recycled materials. Its use in the composition of materials with increased requirements for watertightness and biostability makes it pos-sible to reduce their cost and environmental stress, to increase the efficiency of the use of natural re-sources. The use of the developed plaster mixture will increase the resistance of walls of wet rooms to aggressive environments.

DOI: 10.22227/1997-0935.2017.6.661-668

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HIGH-STRENGTH CONCRETES WITH INTEGRATED USE OF RICE HUSK ASH, FLY ASH AND SUPERPLASTICIZERS

Vestnik MGSU 1/2012
  • Nguyen Dinh Trinh Dinh Trinh - Moscow State University of Civil Engineering (MSUCE) PhD student at the Department Technology binders and Concretes +7-(926)-561-82-98, Moscow State University of Civil Engineering (MSUCE), 26, Jaroslavskoe shosse, Moskow, 129337, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Nguyen The Vinh The Vinh - Moscow State University of Civil Engineering (MSUCE) PhD student at the Department Technology binders and Concretes +7-(909)-99-55-666, Moscow State University of Civil Engineering (MSUCE), 26, Jaroslavskoe shosse, Moskow, 129337, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Bazhenov Yuri Mihajlovich - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Head of Department Technology binders and Concretes +7-(910)-409-78-71, Moscow State University of Civil Engineering (MSUCE), 26, Jaroslavskoe shosse, Moskow, 129337, Russia.

Pages 77 - 82

The use of complex organic-mineral modifiers consisting of superplasticizers, fly ash and silicafume or rice husk ash yields high-strength concrete.

DOI: 10.22227/1997-0935.2012.1.77 - 82

References
  1. Bazhenov Yu.M. Betony povyshennoj dolgovechnosti [Concrete durability]. Stroitel'nye materialy [Building Materials], no 7-8, 1999, Pp. 21—22.
  2. Batrakov V.G. Modificirovannye betony. Teorija i praktika [Modified concrete. Theory and practice]. Moscow, Technoprojekt, 1998, 768 p.
  3. Batrakov V.G., Kaprielov S.S., Sheynfeld A.V., Silin E.S. Modificirovannye betony v praktike sovremennogo stroitel'stva [Modified concrete in modern construction practices]. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and civil construction], ¹ 9, 2002, p. 23—25.
  4. Kaprielov S.S. Obshhie zakonomernosti formirovanija struktury cementnogo kamnja i betona s dobavkoj ul'tradispersnyh materialov [General regularities of structure formation of cement stone and concrete with the addition of ultrafine materials]. Beton i zhelezobeton [Concrete and reinforced concrete], no 4, 1995, Pp. 16—20.
  5. Petrov Yu.I. Fizika malyh chastic [Physics of small particles]. Moscow, Science, 1982, 359 p.

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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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