By  constructing  a  pavement  with  composite  edging.  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...


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 By  constructing  a  pavement  with  composite  edging.  Part  4

For the five-factor model of mathematical regression equation coefficients are defined by [6].
   Discarding insignificant coefficients after checking by Student t-test at the 5 percent level of reliability (Tm = 2.02), we finally write the output parameter in the form of the regression equation:
   yti = 0,166 - 0,028 X1 - 0,055 X2 + 0,093 X3 + 0,028 X4 + 0,034 X5 - 0,013 X1X3 - 0,008 X1X5 - 0,021 X1X2 - 0,013 X2X5 + 0,016 X3X4 + 0,014 X3X5 + 0,013 X32 (10)
   where yti - void ratio ethmoid plate precast foundation.
   To assess the adequacy of the resulting regression equation we use F-Fisher criterion. The equation is considered adequate if the calculated value is less than the table value Fp FT, which is dependent on the confidence probability and degrees of freedom. For the problem adopted confidence level r = 0,95 (Fp = 1,63) <(FT = 1,80), ie, a mathematical model is adequate.
   Using the relation (10) was analyzed the degree of influence of each factor on the value of void ratio ethmoid plate. While varying the thickness of the ethmoid plate void ratio changed to 32%, the slope of the side walls - 49%, the number of holes - 46%, the length of the prism - 60%, the radius of curvature - 2.3 times.
   For the purpose of optimal geometrical parameters of the ethmoid plate precast foundation is necessary to solve the optimization problem:
   KP = f (h, a, R, n, L) max. (11)
   Differentiate (10) to X3 and translating the expression of the encoded in explicit form, we write the function extremum:
   From the expression (12) is easily obtained function lets you assign R for known h, a, n, L from the condition of minimum material consumption:
   R = 0,019 + 0,312 h + 0,002 a - 0,0031 n - 0,0027 L. (13)
   The obtained dependences (10) and (13) allow the rational design of grid plates precast base pavements in terms of reducing their consumption of materials.
   1. Orel VS Design and construction of precast pavements. - Moscow: Transport, 1978. - 149 p.
   2. National coverage of highways / Ed. VM Mo Gilevich. - Moscow: Higher School, 1972. - 384.
   3. Patent number 1538607 RF, 5/06. Pavement / BZ Sha yahmetov, VP Nikitin, VM Sikachenko. - 4163981/23-33; Reported 11/10/86; Publ. 03.90. Bull. Number 3.
   4. Sikachenko VM Development of the construction and evaluation of the stress-strain state of a rigid pavement with a composite base of grid plates: Author. dis. on soisk. exercises. step. Candidate. tehn. Sciences. - Omsk: 1995. - 23 sec.
   5. ODN 218.046-01. Designing non-rigid pavements.
   6. Recommendations on the application of methods of mathematical experiment planning in concrete technology. - Moscow: USSR State Res, 1982. - 103.