By  constructing  a  pavement  with  composite  edging.  Part  2
  ► Materials
  ► Equipments
  ► Tehnologies
  ► Information
  ► Contact us
  ► Home

 Site Search




 Information for builders

 The new articles

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



 By  constructing  a  pavement  with  composite  edging.  Part  2

Other components of the composite plate - asphalt and soil fortified astringent separated in the bulk composition are discontinuous inclusions, with the distinctive features of the matrix material thermo-physical and physical-mechanical properties. The characteristic dimensions of the matrix composite plate believe much more characteristic dimensions of continuous inclusions.
   To calculate the size of the holes in terms of the ethmoid plate precast foundation necessary to know the shear occurring at the line of contact between pavement layers and the values ​​of the required strength of the structural layers of materials to cut.
   Condition of shear strength at the soles of asphalt concrete pavement can be expressed as follows:
   Tsdv. <= Tpr. (1)
   where Tsdv. - Calculated shear force under braking the car with square wheels SKK footprints;
   TPA - the maximum shear stress of the material of the structural layer meshed lattice precast slab foundation.
   Tsdv. and TPA can be determined from the following expressions:
   Tsdv. = Tcz SKK (2)
   Mp = Rcp Fcp, (3)
   where tcz - total shear stresses arising from the combined effects of load and temperature on the contact layers;
   Rcp - the calculated resistance of the material of the structural layer shear at the design temperature, MPa;
   Fcp - cut area, m2.
   Assuming that the area of ​​the cut material structural layer is square holes in the ethmoid plate, from (1-3) we obtain the required orifice area:
   Fotv = tsh / Rsr. (4)
   Thus, the formula (1-4) allow you to define the area as a hole in the plate of the ethmoid terms of strength of materials design shear layers.
   To ensure filling holes in the lattice of precast slabs of asphalt concrete pavement base materials and sub-base of soil, fortified astringent, the angle of the side surfaces of holes selected based on the limit equilibrium theory of granular medium [4]:
   a = (45 + ji) / 2 (5)
   where ji - the angle of internal friction of the structural layer of a suitable material, engaged with precast slab foundation.
   The angle of internal friction ji hot asphalt in the range of 27 to 35 , depending upon the type of asphaltic concrete [5]. For soil reinforced astringent, it is 30-35 . Consequently, in the manufacture of grid plates may be used blockouts from one tilting angle of the side surfaces.
   Consider four hole shapes: square, rectangular, circular and elliptical plates for in terms of size 1,5 x3, 0 m
   The void ratio of the ethmoid plate (CP) and material flow coefficient (Kv) is determined from the expression:
   KP = Vp / VS.P. (6)
   KV = 1 - KP (7)
   where Vn - void volume ethmoid plate, m3; V SP - Gross volume of plate, m3.
   To be continued.