TECHNOLOGY OF CONSTRUCTION PROCEDURES. MECHANISMS AND EQUIPMENT

Fundamentalsof calculations of a vibration-induced smoothingrack for a concrete spreader

Vestnik MGSU 9/2013
  • Kapyrin Pavel Dmitrievich - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, chair, Department of Mechanization of Construction, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoye shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Stepanov Mikhail Alekseevich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, Chair, Department of Mechanical Equipment, Details of Machines, and Technology of Metals; Director, Department of Research and Technology, 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 47-55

The essence of the new development, proposed by the co-authors, consists in the following engineering solution: a concrete spreader, designated for the molding of products to be made of concrete mixtures and composed of a self-moving gantry, is equipped with a hoisting smoothing mechanism and a cart having a travel mechanism that has a roll-over hopper and a dispenser with a shutter, that is kinematically connected to the power engine. The shutter has an elastoplastic lining. The hoisting smoothing mechanism represents a rack having rigidly connected top and bottom plates. The longitudinal groove of the smoothing plate has teeth with a conical body. The teeth are attached to the springs hinged to the bottom surface of the top plate rigidly connected to the rod of the hydrocylinder and a frame installed on the guide of the gantry. The proposed construction of the vibration-induced smoothing rack of a concrete spreader improves the quality of the smoothed surface of concrete mixtures thanks to the higher intensification and compaction of the concrete mixture surface because of deeper penetration of vibrations into inner concrete layers and higher pressure produced on the concrete mixture.

DOI: 10.22227/1997-0935.2013.9.47-55

References
  1. Mikhaylov K.V. Zhelezobeton v XX veke [Reinforced Concrete in the 20ieth Century]. Moscow, Gotika Publ., 2001, 683 p.
  2. Chaus K.V., Chistov Yu.D., Labzina Yu.V. Tekhnologiya proizvodstva stroitel'nykh materialov, izdeliy i konstruktsiy [Technology of Production of Construction Materials, Products and Structures]. Moscow, Stroyizdat Publ., 1988, 448 p.
  3. Bogdanov V.S., Sharapov R.R., Fadin Yu.M., Semikopenko I.A., Nesmeyanov N.P., Gerasimenko V.B. Osnovy rascheta mashin i oborudovaniya predpriyatiy stroitel'nykh materialov i izdeliy [Fundamentals of Calculations of Machinery and Items of Equipment by Enterprises Engaged in Production of Construction Materials and Products]. Stary Oskol, TNT Publ., 2012, 680 p.
  4. Zhuravlev M.I., Folomeev A.A. Mekhanicheskoe oborudovanie predpriyatiy vyazhushchikh materialov i izdeliy na baze ikh [Mechanical Equipment at Enterprises Engaged in Production of Viscous Materials and Products Made of Viscous Materials]. Moscow, Vysshaya shkola publ., 2005, 233 p.
  5. Hammond G., Jones C. 2008. Inventory of Carbon and Energy. University of Bath.
  6. Kapyrin P.D. Betonoukladchik dlya formovaniya izdeliy iz betonnykh smesey [Concrete Spreader Designated for Molding of Products Made of Concrete Mixtures]. Patent Issued to Protect the Utility Model no. 128153, application no. 20131302741, filing date 22.01.2013, registration date 20.05.2013.
  7. Savinov O.A., Lavrinovich E.V. Teoriya i metody vibratsionnogo formovaniya zhelezobetonnykh izdeliy [Theory and Methods of Vibration-induced Molding of Reinforced Concrete Products]. Moscow, Stroyizdat Publ., 1988, 154 p.
  8. DSK «Blok» investiruet v novoe oborudovanie dlya proizvodstva perekrytiy i sten [“Block” Integrated House-building Factory Invests in New Floor and Wall Making Machinery]. Betonnyy zavod BFT Internation [BFT Internation Concrete Factory]. 2009, no. 3, pp. 52—55.
  9. Plouman J.M. The Influence of Variables in the Vibration of Concrete. Concrete Building and Concrete Products. 1953, vol. 28.
  10. Superplasticizers and Other Chemical Admixtures in Concrete. Proceedings of the Fifth Canmet, an ACI International Conference. Rome, Italy, 1997.

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INFLUENCE OF QUARTZ FLOUR ON TECHNOLOGICAL PROPERTIES OF SELF-COMPLETED CONCRETE MIXTURES

Vestnik MGSU 6/2018 Volume 13
  • Pustovgar Andrey Petrovich - Moscow State University of Civil Engineering (National Research University) (MGSU) candidate of technical sciences, assistant professor, Vice Rector for Research, scientific director of the Research Institute of Building Materials and Technologies (SRI SMiT), Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Ivanova Irina Sergeevna - Moscow State University of Civil Engineering (National Research University) (MGSU) research worker Research Institute of Building Materials and Technologies (SRI SMiT), Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Elenova Aurika Almazovna - Moscow State University of Civil Engineering (National Research University) (MGSU) candidate of technical sciences, head Research Laboratory of Building Composites, Solutions and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Abramova Anastasiya Yurʹevna - Moscow State University of Civil Engineering (National Research University) (MGSU) junior research worker of Research Institute of Building Materials and Technologies (SRI SMiT), Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Adamtsevich Aleksey Olegovich - Moscow State University of Civil Engineering (National Research University) (MGSU) candidate of technical sciences, senior research worker of Head of the Department of Scientific Policy, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 717-728

Subject: technological properties of self-compensating concrete mixtures with a fine-grained microfiller, represented by quartz flour. Objectives: to determine the quantitative parameters of the influence of the granulometric composition of quartz flour and its dosages on the workability and delamination of self-compacting concrete mixtures with a constant consumption of gauged water and various contents of the superplasticizing additive. Materials and methods: portland cement CЕМ II/A-S 42,5N was used in the work; natural pit sand of 0…5 mm fraction; crushed stone of fraction 5...20 mm; Silverbond quartz flour with an average particle size of 17 μm and 34 μm (grades 15 and 30, respectively); Superplasticizer based on polycarboxylate ester GLENIUM®115. The grain size composition of microfillers was investigated by laser diffractometry using the laser particle analyzer "Analysette 22" COMPACT in accordance with ISO 13320-1: 2009. The mobility of the cone flow diameter and the delamination of the concrete mixture were measured in accordance with GOST 10181. Results: it was researched the influence of quartz flour of various granulometric composition (with an average particle size of 17 μm and 34 μm), applied in dosages of 50, 100 and 150 kg/m3, on the technological properties of self-compacting concrete mixtures with different superplasticizer content (2, 4, 6 and 8 l/m3) and a constant flow of gauged water, as a result of which it has been established that the use of quartz flour of finer grinding provides higher values of SCC mobility under the condition of equal content of superplasticer and gauged water; when using a more coarse quartz flour, the growth of the dosage of the superplasticizer causes a more pronounced increase in the mobility of the concrete mixture; increasing the dosage of quartz flour allows to reduce the delamination of SCC. Conclusions: experimental studies have shown the effectiveness of the use of quartz flour for obtaining SCCs of various classes of workability (SF1 ... SF3) and resistance to delamination (SR1, SR2) and have established that the use of quartz flour D50 = 34 μm leads to insufficient optimization of the granulometric of the composition of the SCC and, as a consequence, stratification of the mixture with its low mobility, whereas the thinner fraction D50 = 17 μm, of the same type of microfiller, makes it possible to obtain resistant to the delamination of any SCC in for the workability due to varying dosages of both the microfiller and superplasticizer.

DOI: 10.22227/1997-0935.2018.6.717-728

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