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

Vestnik MGSU 9/2017 Volume 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.

Pages 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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STUDY OF CONCRETE POROSITY USING THE INDUSTRIAL WASTE OF COOPER PRODUCTION

Vestnik MGSU 9/2016
  • Kravtsov Aleksey Vladimirovich - Kostroma State Agricultural Academy (KSAA) postgraduate student, Department of Technology, Management and Economy in Construction, Kostroma State Agricultural Academy (KSAA), 34 Uchebnyy gorodok str., Karavaevo settlement, Kostroma district, Kostroma region, 156530, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Tsybakin Sergey Valer’evich - Kostroma State Agricultural Academy (KSAA) Candidate of Technical Sciences, Associate Professor, dean, Department of Architecture and Construction, Kostroma State Agricultural Academy (KSAA), 34 Uchebnyy gorodok str., Karavaevo settlement, Kostroma district, Kostroma region, 156530, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 86-97

The authors consider a problem of the influence of copper manufacturing waste locating in the Chelyabinsk region on concrete porosity when applying it as an independent mineral admixture and as a component of organo-mineral mixed binder for production of concrete with industrial wastes. This trend is current for today’s science because of the growing rates and scales of building production, in particular, of concrete works. Also complex organic mineral admixture consisting of superplasticizers, based on esters with carboxyl groups, and fine grinding copper slag have not been studied by the present time due to the diversity of species and the complexity of chemical structure. Using new complex admixtures and mixed binders processed of industrial by-products showed an high index of their effectiveness. Copper slag dumps located in the Urals federal district haven’t been widely used in building production or in other industrial production by present time. Efficient utilization of copper production waste materials will help to solve ecological problems in most regions of Russia. The results of the study of different porosity groups (pores of different diameter) were presented on porosity development process diagrams depending on the volume of introduction of fine copper smelter slag in concrete with cooper mineral admixture and strength-porosity correlation diagrams. The obtained characteristics don’t confirm the prospects for applying method of joint grinding of concrete with this kind of non-ferrous metallurgy waste. In addition, the obtained results allow us to make a conclusion about little advantages of using this method of binder production. Copper slag can be more effectively used as a component of complex organic and single mineral admixture for concrete production with different purposeы and fieldы of application.

DOI: 10.22227/1997-0935.2016.9.86-97

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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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