Despite the fact that the production ofasbestos-containing building materials in several countries is banned in Russia hrizotiltsement having a truly unique physical and chemical properties, is used for the manufacture of roofing materials and pipes that are most widely used in engineering networks, sewerage and drainage systems, garbage disposal.
The composite material hrizotiltsement whichpreviously it had trade name asbestos cement, obtained by curing a mixture of water, Portland cement and chrysotile. Portland cement ratio in the finished material may be from 80 to 90% chrysotile - from 10 to 20%. The unique properties of this material is due to the fact that chrysotile, which is popularly known as "mountain flax" is able to be split into the finest fibers having improved tensile strength, elasticity, high adhesive and cohesive properties. These fiber reinforced concrete, increasing its strength and resistance to any external influences.
Hrizotiltsement in which chrysotile fibersare in a bound state that prevents them released into the environment is safe. Furthermore, chrysotile in its composition does not react with the alkaline environment of the cement stone, so the material has a high resistance to corrosion. It is not inflammable, not affected by putrefactive bacteria capable briefly withstand acidic environment. In addition, hrizotiltsement - reliable insulator electric currents, electromagnetic and radioactive radiation, it is characterized by low thermal conductivity and can withstand high temperatures. Today the industry produces a wide assortment of hrizotiltsementa, including pipes which are used in construction.
Types hrizotiltsementnyh pipes
Hrizotiltsementnye pipes are distinguished by the conditionsoperation: non-pressure and pressure. Furthermore, there is a gradation in size: inner diameter sections can be from 100 to 500 mm, the length - from 2950 to 5950 mm. Non-pressure pipes are available in two types - normal, having marked BNT and thin-walled, marked BNTT. Pressure hrizotiltsementnye pipe divided by purpose. Those which are used for water pipes, are marked W and intended for heat conductors, designated TT. Depending on the design working pressure, they are divided into several classes, and can be used in the absence of external loads under 0.3 to 1.6 MPa.
Hrizotiltsement has a low coefficient of thermal elongation, its linear dimensions do not change even at high temperatures.</ Blockquote>
Piping of hrizotiltsementnyh pipes
During installation of the non-pressure pipelineshrizotsiltsementnyh pipes for laying communication cables, sewerage and drainage systems, use one scheme: preparing trenches, drainage or discharge kanavy- delivery pipe and couplings to a place ukladki- control of their quality systems installation truboprovoda- leak test or prohodimost- filling pipe .
Hrizotiltsementnye pipes and fittings are sensitive to mechanical damage and shocks, so their installation is carried out with observance of caution, it is desirable, in the manual mode.</ Blockquote>
The connection pipes between them produced viahrizotiltsementnyh or plastic sleeves, which are mounted on concrete mortar, bitumen, special mastic or a binder solution. Best sealing the laying of pipelines in moist soils can achieve using hot bitumen. In normal dry soils well proven clutch made of polyethylene, which before installed on the ends of the tubes is heated to 90-100oS.
For mounting pressure hrizotiltsementnyh pipesare often used together with steel, used hrizotiltsementnye flange or coupling, and the lugs of steel tubes welded to eat through or it tips-tubes coinciding with the outer diameter of chrysotile cement pipe.
Application hrizotiltsementnyh pipes
In Russia, where the manufacture of asbestos cement pipesbegan in 1932, it has already gained a lot of experience on their application in various fields, including and construction. Their popularity is due to the low cost, because the price of such pipes are 2-3 times cheaper than metal and plastic, and durability - more than 50 years. Besides pipelines of different purposes, hrizotiltsementnye pipe used as trunks and chutes as supporting pillars in the construction of pile-pile foundations and casing wells. Septic tanks and storage devices for solid waste management in the autonomous sewer systems - another area of application of this material. From hrizotiltsementnyh pipes are made drainage systems - it made holes all over the surface or only part of it.
In our country, research organizations,dealing with sanitary-epidemiological studies, it has studied the possibility of using hriotiltsementnyh pipes for heat and hot water systems. It has been scientifically proven that the organoleptic, chemical and biological properties of water after passing on pipelines has not changed, as was confirmed by the corresponding certificates.