CAST CONCRETE WITH THE USE OF Copper PRODUCTION WASTES AND NANO SILICA

Вестник МГСУ 9/2017 Том 12
  • Kravtsov Aleksey Vladimirovich - Kostroma State Agricultural Academy (KSAA) Postgraduate student, Department of Building Technology, Management and Economy, Kostroma State Agricultural Academy (KSAA), 34 Uchebniy gorodok, Karavaevo poselok, Kostroma oblast, 156530, Russian Federation.
  • Tsibakin Sergey Valerievich - Kostroma State Agricultural Academy (Kostroma SAA) Candidate of Technical Sciences, Associate Professor, Kostroma State Agricultural Academy (Kostroma SAA), poselok Karavaevo, Kostromskaya oblast', 156530, Russian Federation.
  • Evseeva Tatyana Mihaylovna - Kostroma State Agricultural Academy (Kostroma SAA) Student, Kostroma State Agricultural Academy (Kostroma SAA), poselok Karavaevo, Kostromskaya oblast', 156530, Russian Federation.
  • Sobolev Konstantin Gennadievich - University of Wisconsin-Milwaukee Candidate of Technical Sciences, Professor, Head of Department of Construction and Environmental Protection, University of Wisconsin-Milwaukee, P.O. Box 784, Wisconsin, Milwaukee, USA, 53201.
  • Potapov Vadim Vladimirovich - Scientific Research Geotechnological Center Far Easter Branch of Russian Academy of Sciences Doctor of Technical Sciences, Professor, Chief Scientific Officer, Scientific Research Geotechnological Center Far Easter Branch of Russian Academy of Sciences, 30 North-East shosse, Petropavlovsk-Kamchatsky, Russian Federation, 683002.

Страницы 1010-1018

Subject: applying mineral microfillers based on technogenic waste of non-ferrous metallurgy together with nano silica in the technology of cast and self-compacting concrete is the subject of the paper. The results of the previous experiments proved the effectiveness of the use of ground copper slag in the technology of cast concrete mixtures. However, there are no research results on the combined work of the microfiller and nanoparticles in plastic concrete mixtures. Research objectives: determining the optimal range of the use of nano silica in cast concrete mixtures with copper slag filler from the viewpoint of conservation of plasticity of the concrete mixture and increase of the concrete strength. Materials and methods: plasticity of the concrete mixture was determined according to spread of a small cone on the shaking table by the method developed in NRU MGSU. The strength of concrete samples was checked according to GOST 10180-2012. Statistical processing of the obtained results was carried out by the least square method. Results: plots showing dependence of plasticity of the concrete mixture and strength of cast concrete with ground copper slag on the dosage of nanoparticles and also the influence of the dosage of superplasticizer on the indicated properties at high values of the content of nano silica were obtained. Regression equations for all specified dependencies were derived. Conclusions: it is established that the introduction of nano silica in a dosage of 0.1…0.5 % of cement weight positively affects the concrete strength when used in conjunction with copper slag and superplasticizer. The developed compositions of cast fine-grained concrete mixtures can be used in high-density reinforcement concrete structures with strict requirements for size of fillers and plasticity of the concrete mixture.

DOI: 10.22227/1997-0935.2017.9.1010-1018

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HIGH-QUALITY SELF-COMPACTING CONCRETE WITH COAL BURNING WASTE

Вестник МГСУ 12/2017 Том 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.

Страницы 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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Ensuring high quality and efficiency of the worksin the process of constructing the tunnels of in-situ concrete

Вестник МГСУ 1/2014
  • Ginzburg Aleksandr Vladimirovich - Scientific Production Association «Cosmos» (LLK «NPO «KOSMOS») Candidate of Technical Sciences, Vice-President for Regional Development, Scientific Production Association «Cosmos» (LLK «NPO «KOSMOS»), 38-25, Shosse Entuziastov, Moscow, 111123, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 98-110

In the article the author describes the importance of the technological regulations development in the process of constructing various transport constructions: tunnels, subways, bridges and other important objects. In the article the peculiarities of the tech- nological regulations development are fully taken into account; the dependence of the depth of their development and the quality of the concrete constructions, as well as the speed of the objects of transport infrastructure construction, including the examples of building the road tunnels in Moscow. The course of their development is shown with account for the main provisions, which should be included in technological regulations in order to ensure the most complete coverage of the issues arising in engineering, laboratory and Supervisory structure in the process of performing the works. The author proposes new effective materials and technologies of works. In particular, sufficient attention is paid to self-compacting concrete — a new type of concrete, which is able to flow and compact under its own weight, completely filling the formwork even in case of dense reinforcement, while maintaining the homogeneity and having no seals. The application experience of concrete self-sealing in the construction of the metro showed that labor costs for the concrete mixture sealing were 5-6 times reduced, and the speed of laying the concrete increased 2-3 times. When laying self-compacting concrete high-quality surfaces are formed, which do not require additional costs to bring them to the design parameters. In addition, the work shows the parameters of the technological processes and sets various types of works sequence: the article describes the features of formwork, placement and curing of the concrete in terms of year-round construction, shows the importance of thermo physical calculations of concrete hardening and the efficiency of using self-sealing concrete. Sufficient attention is also paid to the methods of quality assurance and to the methods of preventing cracking of various structural elements of a construction, as well as to the safety requirements and ensuring proper protection of the environment.

DOI: 10.22227/1997-0935.2014.1.98-110

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Self-compacting concrete mixtures for road BUILDING

Вестник МГСУ 3/2012
  • Tran Tuan My - Moscow State University of Civil Engineering (MSUCE) , Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russia; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Korovyakov Vasiliy Fedorovich - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Department of Technology of Binders and Concretes, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russia; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 131 - 137

As a rule, motor roads are composed of the subgrade and the road dressing. Road dressing is composed of the road pavement, road base and the bottoming. Road dressing may be non-rigid (or made of coarse asphalt concrete, fine asphalt concrete, tar concrete, rubble or gravel treated by binding agents, etc.) and rigid (asphalt concrete road pavements resting on the road base made of cement concrete, or prefabricated pavements made of reinforced concrete and ferrocement slabs, monolithic cement concrete pavements).
Cement concrete roads are five to six times more durable than asphalt concrete roads; their service life may exceed 50 years. They are resistant to environmental attacks; they ensure excellent grip of the wheel, and they are dust-free. Their road pavement is resistant to wear (0.1 mm per year); its thickness does not exceed 16-22 mm.
Therefore, effective concrete road pavements require self-compacting though non-segregating concrete mixtures to comply with the pre-set values of their properties, namely, bending and compressive strength, corrosion resistance, freeze resistance, etc.
Acting in cooperation with Department of Technology of Binders and Concretes of MSUCE, NIIMosstroy developed and examined a self-compacting cast concrete mixture designated for durable monolithic road pavements. The composition in question was generated by adding a multi-component modifier into the mix. The modifier was composed of a hyperplasticiser, active (structureless) fine and crystalline silica, and a concrete hardening control agent.

DOI: 10.22227/1997-0935.2012.3.131 - 137

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