Prospects  for  the  development  of  methods  for  improved  concrete  hardening  in  the  XXI  century.  PART  1
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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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 Prospects  for  the  development  of  methods  for  improved  concrete  hardening  in  the  XXI  century.  PART  1

  XX-th century contributed enormously to the development of concrete construction technology through intensification and its hardening. Developed the theoretical basis of hardening concrete, concrete works in the cold, a variety of methods to accelerate the curing of concrete in factories and construction sites, new and effective types of cements and concretes, chemical additives for concrete and more. This allowed the construction of general and concrete and concrete in particular, to a new stage - it was quick, less expensive, large-scale, and erected buildings and structures, including highly (see, eg, Fig.) - More durable and reliable.

   High rates of construction of concrete and reinforced concrete, which will remain the primary building material until the end of the XXI century, require finding ways to accelerate the hardening of concrete without reducing its quality and durability.

   In the XXI century the development of stimulation techniques lead to hardening of concrete:

   particularly the emergence of fast binders that allow or even abandon heat treatment of concrete, or significantly reduce its duration. Developed in the last decade, binders such, unfortunately, the road and have a rapid setting time, which makes it difficult operations with concrete mix;

   the emergence of new effective chemical additives to accelerate the curing of binders, which will contribute to a significant reduction in the curing time of concrete at ordinary temperatures to achieve the desired strength. In the last century failed to get good hardening accelerators, so the development of safe and effective supplements of this kind should be intensified;

   concrete with heat treatment mainly using electric energy. Thermal effect on the fresh concrete is the most powerful method to accelerate its hardening and great future methods of electrothermal, for electrical energy allows you to easily manage the process of warming up and automate it.

   Electrothermal among the most environmentally safe methods, and in this respect it can not compete with steam-water-gas heating concrete methods.

   The main method of thermal effects on concrete in factories and construction sites will electrothermal in various versions, the improvement of the methods of this group will be given special attention. Will develop new, more fuel-efficient and durable heating devices, new materials for electrodes, steam and thermal insulation. Particular attention will be paid to the automation of heat treatment, which reduces power consumption.

   Application acceleration methods of hardening concrete will be in factories and construction sites. At the basic principle - heat treatment using electrical energy, heating the concrete modification techniques in factories and construction sites partially coincide, but there will be great modification, the most suitable for the specific conditions of the specific production.


  

  To be continued.


  
  

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