XXI  century  -  a  century  concrete  and  reinforced  concrete  (END)
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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...

 

 
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 XXI  century  -  a  century  concrete  and  reinforced  concrete  (END)

In the overall structure of concrete and concrete application of precast concrete in Russia dominates. This is explained primarily by climatic conditions in Russia, the desire to move the process of making designs in enclosed spaces. Characteristically, in the Scandinavian countries with cold climates (Sweden, Finland, Norway) precast concrete volume with respect to a monolithic also dominates. But even in hot countries and countries with temperate climates precast concrete is used more and more widely.
   Last Congress passed precast concrete in the U.S., the country has traditionally focused on the monolithic construction.
   Exceptionally high seismic resistance have concrete panel buildings. A case where the building because of soil liquefaction during earthquakes inclined at 45 , have not been damaged. Now, when seismic intensity increased number of Russian regions, focus on the construction of panel buildings should be decisive. This, incidentally, will give new impetus to the production capacity utilization of idle enterprises panel construction.
   Vivid demonstration of the effectiveness of precast construction is the construction of a tunnel under the English Channel between France and Britain, the total length of the three threads that exceeded 150 km (2 transport tunnel 7 m in diameter, one technical diameter 4 m). Facing tunnels made of precast concrete tubing weighing 8 tons each.
   As you can see, precast concrete does not leave the scene of world construction, and continues to evolve. This is explained by the following circumstances. First - under steady production is much easier to ensure consistent product quality through the organization of operational control, the second - modern polymeric materials used for making molds, allow to diversify types of products and options for their architectural finishes, and the third - the use of chemical additives in concrete can reduce or completely abandon such methods as vibrating concrete in order to seal it and the subsequent temperature (usually steam) processing, Concrete mix design, construction forms currently allows to obtain high-precision products with tolerances of tenths of a millimeter.
   It is important to create energy-saving technologies precast concrete, primarily through the use of a new generation of cements and additives. Chemisation concrete - one of the cardinal directions of its improvement. Need to expand the use of multi-purpose additives.
   Production of concrete on its technological content should be organized as a chemical production with strict control of all properties of source of raw materials and technological processes. Certification of construction enterprises for compliance with the ISO 9000 series of RF is the most urgent task for the near future. Should be preceded by the presentation of all domestic documents regulating the quality of products of the construction industry, in terms of a series of standards OSJI 9000. In developed countries, the company certified for compliance with OSJI 9000, has a much better chance to succeed in the market of the construction industry. Among other things, the existence of such a certificate is a great element of advertising.
  

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