TECHNOLOGY OF CONSTRUCTION PROCEDURES. MECHANISMS AND EQUIPMENT

PREPARATION OF CEMENT MORTAR REINFORCED BY MODIFIED MICROFIBER IN A TURBULENT MIXER

Vestnik MGSU 3/2016
  • Belova Tat’yana Konstantinovna - Orenburg State University (OSU) Lecturer, Department of Construction Production Technology, Orenburg State University (OSU), ; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 47-58

The improvement of the structure of cement mortars on micro- and nanolevels by means of disperse reinforcement by modified microfibers promotes the considerable improvement of operational characteristics of the designs made on their basis. However, the absence of the developed technology of preparing the cement mortars reinforced by the modified microfiber providing the uniform distribution of the microfibres in volume of a composite constrains the widespread introduction of such solutions in the construction practice. The results of the researches of the technological parameters of preparing the microfiber reinforced cement mortars in the turbulent mixer are presented in article. The results of the production experiment on determining the bending durability are reflected as well as the variation coefficient of the durability of the reinforced samples prepared by means of the turbulent mixer. The results of the influence of the water-cement relation of the mortar mix and influence of the time of mixing the components in the turbulent mixer on change of mobility of the mix and strength characteristics of the hardened solution are presented. The results of the tests indicated the efficiency of preparing cement mortar reinforced by modified microfiber in the turbulent mixer. The reinforced samples are characterized by the increased bending durability and high uniformity of the strength characteristics. In case of turbulent mixing of the components of mortar mix its mobility increases from 5 to 25% in comparison with the mix prepared manually. The time of mixing the components in the turbulent mixer has an impact on the strength characteristics of the fiber reinforced solution. The optimum time of mixing the components contributes to a certain water-cement relation of the mortar mix. Therefore, the preparation of the cement mortar reinforced by the modified microfiber in the turbulent mixer is characterized by high efficiency and productivity, the strength and technical characteristics of the solution increase.

DOI: 10.22227/1997-0935.2016.3.47-58

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ANALYSIS OF TECHNOLOGICAL PARAMETERS WHEN CONSTRUCTING INVERTED ROOF STRUCTURES WITH GREENERY

Vestnik MGSU 3/2018 Volume 13
  • Shushunova Natalia Sergeevna - Moscow State University of Civil Engineering (National Research University) (MGSU) Postgraduate Student, Department of Housing and Communal Utility, Research Scientist of the National Standards of Green Construction Laboratory, Assistant of the Department of Environmental Engineering, Moscow State University of Civil Engineering (National Research University) (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 349-355

Subject: the subject of the study is technological parameters of the construction of roof structures with greenery. At present, the problems associated with the study of technical and technological parameters in the design of non-traditional energy-saving engineering systems, as well as their influence on the state of the housing and communal complex, have not been sufficiently studied. Research objectives: in order to reduce the labor costs in the construction of the roofing, reduce the time required to carry out repair and restoration work and ensure the quality of the roof’s operational usability, several variants of inverted roofing with greening were considered, and the best variant of energy-efficient structure and technology of erecting green roofing was identified. For modern buildings, with the use of advanced construction technologies, compliance with criteria of high constructive quality, manufacturability, and durability of building materials must be met. Materials and methods: the research uses methods of mathematical modeling, as well as modeling of technological processes in software environments. Results: based on the analysis of technological characteristics, it is established that among the technological processes and operations with different options for erecting green roofing systems, the best variant is the inverted “green” roofing with the use of modular structures. The labor intensity of erecting this roofing is 47.13 man-days, which is 38 % lower than in alternative versions, and the total duration of the roofing construction is 17 days, which is almost twice less than that in analogous designs. The use of modular technologies in greenery systems, the improvement of technological processes of erection of roofing with greenery systems are aimed at reducing the labor intensity of works and reducing the duration of construction, and in addition, implementation of innovative technologies contributes to an increase of the service life of the roofing and a longer operation of the object of construction (by 20-30 %). Conclusions: the use of rational technologies in the construction of roofing with greenery systems is the most effective solution, as the labor intensity of technological processes is reduced when constructing roofs with greenery systems in comparison with traditional types of roofs, and during the roof operation, the development of functional purpose is ensured.

DOI: 10.22227/1997-0935.2018.3.349-355

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