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Protect the surface of the concrete floor
To protect the concrete floor, which is operated in the normal mode, or is subject to wear in areas with high traffic, there are several ways to protect the surface.
   Comparable ways: their cost, appearance and ability to perform the task to protect.
   In this article, we consider three ways to finish and protect the floor. Each of them has its advantages and disadvantages.
   Thin fil...

Finishing compositions based on water glass. Part 3
When used as part of exhaustion moderator comes coagulation and solidification of liquid glass. However, due to the presence in the composition of Portland cement with a finishing time is an increase strength of the coating due to hydration of cement minerals. Thus from colloids formed during the coagulation liquid glass are actively assigned to the water for hydration of cement, a porous media formed tumors filled Portland cement, which leads to...

Finishing compositions based on water glass. Part 2
Studies in Berlin Institute Federal institute for Materials Research and Testing, show that the average density of 1730 kg/m3 brick large proportion of pores having a size in excess of 1 micron is more than 90% [3] and they are responsible for the increased migration of fluids through brickwork.
   Most fully meet these requirements structure obtained by coagulation and water-soluble potassium silicate forming silica with a high sp...

Modernization and repair of self-propelled machines. (3)
Hardening electrolysis BORATING hinge pins and bushings mates working equipment hydraulic excavators EO-4121 (EA-4321) gives an increase in wear resistance 4-6 times compared to the bulk quenching details.
   Taking into account the high wear resistance of brazed blades, hardened sintered alloys (see Table 1), are recommended for carbide knives dumps graders DZ-122 and RS-98, combined machine E-405 based on KAMAZ, for front dumps a t...

Specialized exhibition Architecture. Construction (END)
Mari-lime brick and gas silicate blocks
   JSC "MZSK" produces silicate brick and a half, color (white, yellow, black, red, blue, green, brown).
   For the production of silica brick used quartz sand from quarries near the plant. Limestone enters the factory with Dobryatinskogo deposit Vladimir region. Silicate brick (Table 1) is used for masonry exterior and interior walls of buildings and structures, as well as ...

Geophysical processes primers and security. Part 5
In the center of Moscow can distinguish vertical structure comprising a crashing into the Earth`s crust magma elongated cylinder (Fig. 2) [5]. In the center section marked lack of extensive vertical zone converted waves ("blind spot"), going from the depths of 70-80 km to 7.5 km. Such "blind spots" are characteristic of the earth`s crust with the introduction of monolithic dense mantle rocks such as gabbro, diabase, etc. In such a zone Tashkent e...

Finishing compositions based on water glass. Part 1
The quality of the decoration of buildings for new construction and reconstruction depend not only on their aesthetic, but also the operational parameters, as good-quality finish - a guarantee of durable service basic designs, long maintenance-free operation, the costs for maintenance and care. Traditional binders used for the production of finishing compositions, liquid glass is widely used, but it has some drawback: coatings based on it gaining...

On possible amendments to the equation Griffiths
Griffith presented a picture of destruction allowed to formulate the problem of determining conditions of the beginning of crack propagation and find its general solution.
   As seen from the above schemes, in the process of crack propagation material directly adjacent to it "coasts" unloaded relaxes. This means that the stress and strain it decreases, and the elastic energy stored earlier in this area of ​​the body is re...

Construction skyscrapers - the requirements of modernity. Part 4
The program is a high-rise building in Moscow
   The project is now a high-rise building in Moscow is implemented in two main areas: the construction of business center "Moscow City" and implementation of the program of the Government of Moscow "New Ring of Russia."
   1. Moscow international business center "Moscow - City"
   The project includes the construction of buildings on the territory of abou...

Degree project - beginning of the road. (3)
Given the great diversity of subject matter and content of diplomas in various specialties, the jury is faced with great difficulties in determining the winners - "Who better violinist or a dancer?". Nevertheless, often based on emotional perception and can estimate the relevance and novelty, and the author`s contribution to the thesis project or job. Absolute winners in recent years have been graduates of Rostov CSO GASU St. Petersburg, Nizhny N...


 Information for builders



 Technology  and  equipment  for  foam  concrete  by  dry  mineralization  of  the  foam

Prevailing economic conditions in the country determine a new approach to the choice of efficient building materials for housing.
   Introduction to the country of more stringent energy-efficient building codes makes many traditional materials for walling technically and economically unacceptable.
   The most promising in this situation cellular concrete, the effectiveness of which Walling convincingly proved. It is non-flammable, environmentally safe, has the necessary strength and insulating properties. Microclimate in the house of aerated concrete close to the microclimate of the wooden house. Market analysis shows that the optimal direction of expansion and development of cellular concrete production - creation of an extensive network of small factories and workshops for the production of piece goods (building blocks, insulating panels) of non-autoclave aerated concrete and poured concrete construction of such concrete using simple small mobile units to fill walls, warm - and zvukoteploizolyatsionnyh layers of roofs, floors, ceilings, etc. for the implementation of this direction is necessary to create a simple, effective technology, whose dependence on the environmental parameters, the quality of raw materials, skilled workers will be minimal.
   These conditions are fully responsible for technology of foam concrete dry mineralization developed at the Moscow State Construction University [1,2]. The basis of this technology is put way "dry mineralization foam", which includes two main technological operations: preparing foam given multiplicity of aqueous foam mineralization and its dry powder binder or binder with filler in their simultaneous stirring.
   This technology is distinguished by:
   easy and reliable equipment for penomass;
   ability to control the medium density foam from 300 to 900 kg/m3;
   sharp decline vodotverdogo relationship and flow of foaming agent that accelerates the strength development and improves the physical and mechanical properties and performance of foam;
   the ability to work on various types of hydraulic and air binders: Portland cement, VNV, TMB, gypsum and Phosphogypsum binders;
   the possibility of foam concrete without heat treatment;
   Use unmilled siliceous components;
   Use as foaming domestic synthetic surfactants (surfactant) having a low manufacturing cost and are widely established in Russia.
   Technology is implemented in a series of installations for foam concrete factory and built conditions. Currently developed:
   site preparation foam mini-workshops for the production of building blocks average density of 900 kg/m3;
   Mobile device for mechanized complex monolithic heat and zvukoteploizolyatsii roofs and intermediate floors ties with an average of 400-800 kg/m3 density foam;
   universal mobile mechanized complex for monolithic construction with an average density of the prepared foam 400-900 kg/m3;
   space-saving installation-trailer to the mini-tractor, working PTO, for cottage and rural construction, etc.
   developed technology and equipment have been broad industrial approbation reaffirming their high efficiency.
   Currently MGSU conducted research on the development of new formulations of foam concrete mix, the search for new types of foaming agents, and work to improve the equipment.
   1. Merkin AP, itchy EA An apparatus for producing and conveying foam concrete mixes / / Building and road machines. N11-12. 1992.
   2. Rumyantsev BM, itchy EA Roll mechanized complex device heatsoundproof layers of foam dry mineralization / / Industrial and civil construction. N8. 1997.