Use  foam  in  the  construction  industry.  Part  4
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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  4

Application of foam
   During the last fifty years, the use of foam in the construction industry has been limited solely to its non-structural applications, such as, for example, filling holes and trenches recovery device insulation and manufacturing units. With improved features and more in-depth knowledge about the behavior of foam concrete may design special purpose.
   Prefabricated foam concrete blocks used to build houses, fire partitions, cattle farms. Currently, work is underway on the use of flame retardant foam in order.
   Foam concrete has been successfully used to repair the trenches, where poorly compacted backfill leads to sediment and collapse. Experimental studies show that the wall thickness of the pressure pipe of a large diameter can be reduced by using a foam material as the fitting. Quality control of monolithic foam remains a challenge.
   Despite the fact that the means of reinforced concrete structures can be used to foam, the latter during shearing strength significantly lower than that of normal concrete, and to prevent chips requires extra reinforcement. [9] Test foam concrete wall panels reinforced with steel, blocks, plates confirmed the possibility of using foam as a structural material. Studies composites consisting of foam concrete slabs cast on wooden beams in the construction of two-storey buildings, showed great potential of this method of construction.
   Foam concrete is strong and durable material and provides ample opportunities to use this material in the construction industry. Foam properties different from those of conventional concrete, so design engineers and manufacturers of foam in the design and production should always take into account the actual material properties. It is necessary that researchers, contractors and designers to share their knowledge and thus extends the use of foam.
   The author expresses his gratitude to Research Grants Branch Dyuraset company Grinaker and program TNK1R South African National Research Foundation for the opportunity to perform the works presented in this article.
   1. Kearsley EP The Use of Foamcrcte for Affordable Development in Third World Countries. International Congress, Concrete in Service
   of Mankind, Dundee. Scotland. June 1996, pp. 233-243.
   2. Kearsley EP The effect of High Volumes of Ungraded Fly Ash on the Properties of Foamed Concrete, PhD (Engineering) August 1999, University of Leeds, UK.
   3. Kearsley EP, Wainwright PJ Ash Content for Optimum Strength of Foamed Concrete. Cement and Concrete Research Volume 32 (2002) pp. 241-246.
   4. Kearsley E.P., Mostert HF The Effect of Fibre Reinforcing on the Properties of Foamed Concrete Proceedings of International Symposium: Role of Concrete in Sustainable Development, Dundee. Scotland. September 2003, pp. 557-566.
   5. Kearsley EP Just Foamed Concrete - An Overview. Proceedings Creating with Concrete (Conference on Specialist Techniques
   and Materials for Concrete Construction), Dundee. UK, 1999 Thomas Telford. London. 1999, pp. 225-237.
   6. Neville AM Properties of Concrete (4th Edition) Longman Group Limited. Essex, 1995.
   7. Kearsley EP and Wainwright PJ Porosity and permeability of foamed concrete. Cement and Concrete Research Volume 31 (2001)
   pp. 805-812.
   8. Kearsley EP and Booyens PJ Reinforced foamed concrete - can it be durable? Concrete Beton No 91. pp. 5-9. November 1998.
   9. Kearsley EP & Mostert HF The use of foamcrete in Southern Africa Proceedings of the ACI International Conference on High Performance Concrete, SP-172, Kuala Lumpur, Malaysia, 1997, pp. 919-934.