Increased  strength  of  brickwork  from  the  presentation  of  the  real  results.  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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 Increased  strength  of  brickwork  from  the  presentation  of  the  real  results.  Part  1

Modern high-tech building materials economically and aesthetically attractive, highly effective, but have rather limited use. Steel and heavy concrete are durable and resistant to cracking, but are unsuitable for enclosing and protecting structures and coatings. Thermal insulation and protective materials are not durable enough and strong and can not be used for the manufacture of load-bearing structures. Structural heat-insulating material, despite its appeal, do not have high reliability and durability.
   By the number of positive qualities to compete with brickwork can wood, but it is much less fire-and biostability and durable. In addition, because of the natural wood origin eliminates the possibility of artificially affect its structure, seeking to improve the technical efficiency of the material, but only allows data nature of the property. Therefore Academician GP Perederiy said: "... can be taken as a rule, as soon as the engineer is considering the construction of a permanent bridge, he must first of all think about the stone bridge, and renouncing it, should be aware that waives the best solution for which, of course, must be sufficiently compelling reasons. "
   Getting strong durable masonry today is a problem because its strength is still much behind the concrete strength. In recent
   50 years, the average strength of concrete increased from 150-200 to 400-500 kgf/cm2 kgf/cm2 or more. Strength of unreinforced masonry unchanged at 39 kgf/cm2 (using bricks and mortar brand 300 200). Application of transverse reinforcement increases the strength of masonry
   to 78 kgf/cm2.
   Usually masonry seems simple set of solution seams and brick, so generally tend to increase the strength of masonry, increasing compressive strength and flexural strength of bricks and mortar. But this view is fundamentally wrong. Masonry - is the result of collaboration and interaction between structural elements of different levels depending on their relevance and geometric dimensions. Should be considered masonry structural elements from the largest to the smallest: the interaction of brick and mortar, cement paste and aggregate in solution seams, crystalline concretion and gel component in the cement paste, the pore system and voids of different levels, etc. Such an order - the result of the development of classical science.
   Changes in the view of the material and masonry. Today, it takes into account age, external influences, quality binders and other structural elements. Regulatory documents to consider these factors before, but the transition to high-strength, more stable in properties mortars allowed to reduce the influence of time. Creep is measured using a clutch creep ratio depending on the type of brick and mortar. Extensive development of the strength and deformation properties of masonry exhausted itself as an increase in the strength of bricks and mortar has little effect on the strength of masonry.
   The latest scientific advances require to take into account the complex internal processes of interaction of structural elements at various levels of the structure. It should be tailored to suit masonry construction technology, the conditions of its operation and age of the material.
  
   To be continued.

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