Use  foam  in  the  construction  industry.  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...


 Information for builders



 Use  foam  in  the  construction  industry.  Part  1

Despite the fact that for many years used when terminating foam voids, insulation, restoration of trenches and for the manufacture of building blocks, it is still perceived as fragile and short-lived material. However, it may have a relatively high density, strength and durability and used as a structural material.
   Penobetonu could be defined as a cement material containing at least 20% of foam plastic involved in the mortar mix. Despite the fact that the concrete mix is ​​self-sealing, fluid and capable of pumping and the foam has good thermal, acoustic properties and frost, it is still perceived as fragile and short-lived material. Over the past fifty years, the use of foam concrete in construction was limited solely to its non-structural application, for example, when filling voids and restoration of trenches, with heat insulation and manufacturing units. In the past, unstable foam penobetonu not provide properties corresponding to its structural applications, however, the development of protein hydrolysates as the foundation for the blowing agent, and specialized equipment penogeneriruyuschego made possible the production of foam, which can be used as a structural material. Foam can be used quite extensively in the construction industry, but it should manufacturers while ensuring the strength and durability of this material. Designers must ensure compliance with foam material properties of the intended application. The main properties, which are typically of interest to designers is the density, strength and durability of the material.
   During the past fifteen years, researchers from the University of Pretoria (South Africa) determine the properties of foam concrete and set parameters that affect these properties. This article discusses some of the properties of foam and possible areas of application.
   Foam strength
   There are no standard methods of foam concrete mix design. For normal concrete consumer assigns compressive strength, and this condition is ensured by adjusting water-cement ratio. Since the foam is very sensitive to variations in water content, water-cement ratio in the foam concrete can not be used to control the compressive strength. If the foam concrete mixture in water is insufficient to provide an initial reaction of cement, the latter begins to withdraw water from the foam, thus leading to its rapid coalescence. If too much water, then the segregation, leading to large differences in the density [1].
   When designed foam that is generally considered not only the strength but also the density. Since the compressive strength of the foam is a function of density, the latter can be used to adjust the strength. By reducing the density of the materials used for the production of foam, void volume required to achieve the desired density, can be reduced, thereby increasing the strength of foam concrete in compression [2].
   To be continued.