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History of asbestos termination in Iran

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July 18, 2019

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In the 16th environmental department act, the necessity of asbestos elimination was approved and the task was given to a committee by the name of committee of planning the elimination of asbestos in factories.

 

In the second day 1379 of mordad The committee decided to completely eliminate asbestos in 7 years.

 

In the 15th of mordad of 1387 as the deadline had been crossed and the production and use of asbestos had not been stopped, the chief of presidents office issued a letter to the environmental department, by the order of the president,  to stop all asbestos use until a suitable substitute has been found . The director of industrial mines of the industry ministry issued the order in the same day. Considering the pressure by the environmental department to enforce the 16th act of the high council of environmental department, in the 1389 16th day of aban the industry minister issued a letter to the first council of the president to keep using white asbestos only, until a suitable substitute is available and as soon as such substitute is introduced, within 6 months all use of white asbestos will be stopped.

 

In 1390 khordads first, after surpassing the due deadline by nearly 3 years, the environment preservation department issued an order to stop all use and importation of asbestos.

 

In 1390 khordads the 4th, the manager of industrial mine department of industry ministry expressed his concern regarding the closer of factories to the council of industry minister. The labor minister in 1390 tir’s 12th, issued a letter to the president insisting on the permission asked in 1380 aban’s 16th and asked for the act of foundational industry and environment act by the number of 446557 in the 24th day of tir of 1389 to be issued.

 

At the end, the first council of the president issued a letter banning any kind of asbestos use in the process of factories including spare machine parts and construction materials. In this letter the use of asbestos in the production of pressured and sewer pipes was allowed under certain conditions until the 1391 shahrivar’s 31 day and the deadline was announced none renewable.

 

In 1390, baverce co. considering the 20 years of experience in this field and considering the necessity of replacing asbestos in the fiber cement industry started to launch the plan of asbestos free fiber cement sheets in its own concrete pipe factory.

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Cellulose preparation plant process in eyvanit sheet production

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July 18, 2019

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The purpose of cellulose preparation, is the production of high flow cellulose in order of fiber expansion without fraction.  This means that the fiber after the expansion becomes thinner. Liquid limit of cellulose is measured by a Canadian Standard, Freeness method or C.S.F, according to the ISO 5267/2 standard with the measurement unit of ml and the Schopper Riegler method of SR according to the ISO 5267/1 standard with the measurement unit of degree or (°). The extent of expansion required is a function of production type. (Flat sheet meant for inner use, flat sheet meant for outer use and corrugated sheets)

Without the appropriate expansion, cellulose fiber has the below disadvantages:

A: fibers are too big and rough to use beside cement. In this situation the tensile strength of the product is low and does not have the necessary area to ensure the ultimate tensile strength in fiber cement sheets.

B: The rough and big fibers can’t keep the necessary amount of water in the screen tank. The mesh cracks of the screen tank is bigger than the cement pieces, sillies and other extra materials. So the big fibers can’t stop the escape of these materials and a large portion of these materials exit the screen tank and cause a considerable amount of trouble in the water cycle use.

C: the excessive amount of cellulose in the plasticity production process causes a decrease in the quality. For example resistance against freezing of fiber cement products can decrease, also particle separation and cement parts from the fiber cement area can occur and cause some problems for the color coverage of the product.

Baverce co. cellulose production process is equipped with the below machinery to prevent the above problems:

  1. Water tank is equipped with water volume controller
  2. Cellulose feeding system including elevator, equipped with load cell.
  3. Cellulose pulper with 8 cubic meter velocity and 75 kv power
  4. Cellulose evacuation pump from the cellulose pulper (Centrifuges type).
  5. Two opening cycle tanks or refining cellulose fibers.
  6. Trash rack
  7. Refiner feeding pump, mohno type, with consistent discharge rate.
  8. 250 kv disc dual refiner to open or refine cellulose fiber
  9. Dual cellulose processing tanks with mixer, by the velocity of 100 cubic meter.
  10. Cellulose transition pump to material building section.
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Cement board oven dryer (flat eyvanit sheet)

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July 18, 2019

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Cement boards, after completing grasping and curing process, have higher moister than the environment and after being exposed to the dryer, loose some of their moister and have a minor shrinkage and a minor reduction in their dimension like most construction material. So if the cement boards are not properly dried or in other words, their moister has not been reduced enough, after being installed in the structure and being exposed to the fresh air; lose some of their moister and the wrenches attached to the boards cause shrinkage or convexity or concave. This can cause internal tension and lead to cement board rapture from the wrench installation points and cause fracture from the edges of the board.

This is why the cement boards need to be dried and have their moister reduced to an acceptable amount to stop this flaw from happening.

Considering this problem baverce co. has designed, manufactured and launched an oven dryer to place its productions in before delivering it to the customers to prevent such problems occurring before installation.

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Flat fiber cement board grasping process

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July 18, 2019

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The process of fiber cement board grasping is as follows:

1) Grasping in free air:

In free air grasping system, cement hardening and hydration bounds are formed in free air, as in other cement based products. After 6 to 10 hours from the time that sheets crossed through the heating tunnel with the approximate temperature of 50 to 60 degrees and the moister of nearly 100% the products have the appropriate strength for movement. The products are separated from the mould and are placed for at least 21 days in, damp free air inside a lidded space to reach their ultimate strength. In products produced in this manner poly vinyl alcohol (PVA) fibers ensure the arming of cement to ensure the tensile strength of the product.

               2) autoclave grasping:

               autoclave process causes basic changes in hydration materials for example high temperatures causes crystal shape silicate hydrate structures. In fact, the grasping system in free air, silicate hydrate crystals are formed but in very high temperatures in autoclave method the crystal structures are changed and the tobermolit structures are formed and can cause an enhancement in the sheets properties. In this system the cement is mixed with sillies with the approximate ratio of 40% cement and 60% sillies. The initial set is like the previous explanatory method in heat house but the ultimate grasping in autoclave and in the approximate temperature of 180 degree and saturated environment is set by the vapor pressure of 12 loads in which the silicate hydrate is formed. The crystal structure formed gives the product good physical properties which it has tensile tension and so the use of PVA is eliminated. The product produces in autoclave method and after passing the dryer is ready to be delivered to the customer.

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Ardoise

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July 18, 2019

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Ardoise is a French word with the meaning of Fine – grained metamorphic rock which is made as a thin layer and sheets with smooth surface.

eyvanit Ardoise is produced by undergoing a pressure of 100 to 150 kg/cm² on its surface to be compressed and gain the same properties as natural Ardoise and for this reason mechanical properties and resistance against weathering is more than flat sheets and is closer to the properties of natural rocks.

Ardoise is a light coverage, impenetrable and beautiful that gives a classic look to villas and the façade of the buildings with high gradient.

Ardoise is carefully cut and hole-drilled to decrease installation time.

Ardoise installation tools, packaging details and properties:

Dimensions: 300by600 mm

Thickness: 4mm

Flexural strength: 220 kg/cm2

Number in a box: 10

Number in a pallet: 1020

Number used to cover 1 m2: 17

Number of truss or girder under the frame work: 900 mm

Framing distance under the foundation : 200 mm

Dimensions of wooden beams under the foundation: 30by40 mm

Required fastener: 2 galvanized nails and 1 crampon

Installation details of Ardoise avanet

 

 

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Fiber Cement Boards

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July 15, 2019

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Today with the development of building technology, using precast materials, according to high possibility of quality control and construction speed, is more welcomed by people more than past. One of this precast materials that is used in inner surface and facade is Fiber Cement Board. According to high flexural strength of Fiber Cement Board, it is used in interior and exterior façade and walls, floor and roof covers.

Fiber Cement Boards have High resistance to fire, they are good sound & heat insulations and waterproofed. Comparing to similar products, Fiber Cement Boards have more resistance to absorption and moisture passage. Although in submerge condition they absorb water and their flexural strength decrease, but after being dried, without any size deformation, the original flexural strength is back,According to the fact that are so smooth, after installation, without being finished, they can be colored, wallpapered or any PVC cover & HPL plate.In the following, you can see the production process
Uses of Fiber Cement Boards:
1-interior cover of building:
Lining inside walls:
Fiber Cement Boards with a density up to 1600 Kg/m^3 could be used in internal space of the building and cover. Due to the high impact resistance of this product and suitable mechanical properties, it could be used in walls of a busy place.According to different varieties in design and colors, the Fiber Cement Boards can be used as décor walls or final covers (without being colored) in offices, residential and business places.Substructure of tile and ceramic in toilets, pools, and very wet locations:According to high water proofing of Fiber Cement Boards and strong adhesion to mortars and tile bonding layers, it could be used as Drywall`s covers in such places.Stepped ceilings:In offices, residential and business places and also wet places like pools and which are possible to humidity or steam contact Fiber Cement Board can be used as stepped ceiling in the form of 60*60 tiles or decorative.
2-dry wall Fiber Cement Board:
Is dry wall with fiber cement plate cover without asbestos or Fiber Cement Board that can be used as interior or exterior walls along with facade. There is no need to use traditional material in the wall.Components in dry wall Fiber Cement Board:
1-Ultimate external cover: Acrylic water based color, textured cover.
2-External cover: Fiber Cement Board due to covering external wall and façade simultaneously.3-
Cushioning4–
thermal and sound insulation, water and steam barrier5-Polyurethane insulation, rock wool, poly styrene (heat and sound insulation), water barrier (exterior strap with a one-way layer like tie walk), vapor barrier (internal vapor strap with a normal nylon layer)6-Interior cover: Fiber Cement Board, gypsum board, robiits Plus spray gypsum7-Ultimate interior cover: Acrylic water based color, plastic or oil color, wall paperRun the Fiber Cement BoardAccording to the way of using Fiber Cement Board, which is used as covering or dry wall and well defined in previous sections, the way of running is as following:1-Running dry wall system:in this system, because of in-plane stiffness, if it is executed  as the Seismic performance of the building will not changes in main. Dry wall system contains horizontal and vertical parts as cold rolled steel sheet. Horizontal parts (runners) are installed on two levels, one on the floor and the other one on the ceiling, by hilty nail or screw; and then, The vertical parts (stadia) depending on wall and building’s usage are placed on runners at standard distances. In structuring walls, the stadia is not screwed in runners, but has a free space to play???? , and the connection type is by screwing Fiber Cement Board’s panels. This type of flexible connection between fiber cement board and stadia & runner is will reduce the earthquake force and while the earthquake happens there will not be any extra pressure or reaction force on the structure and it will not affect the seismic behavior of the building. After that structuring is completed, Fiber Cement Board plates are installed on the structure by screw. If needed, seal materials like rock wool, glass wool and poly styrene will be used between Fiber Cement Board’s plates.

2-Introducing Fiber Cement Board wall system:

Fiber Cement Board wall is designed to solve the traditional wall’s problems and complete dry wall’s system. This system, in addition to quick construction and mechanical connection to the building and structure, is stronger than dry installation of similar system and doesn’t have problems such as hollow sound, unsafety, insects penetration in the free space of the wall and…. Fiber Cement Board wall consisted of galvanized stadia runners, are connected to the ceiling and roof by hilty or nails and after placement of mechanical and electrical installations, both side of the wall is covered by Fiber Cement Board. After the Fiber Cement Boards are installed, light weight concrete mixed with cement, granule poly styrene and additives is injected into the wall and at the end the seam between Fiber Cement Board, is covered by sealing and the result is a high quality wall prepared for color or any other polishing.

3-implacemment of the cement board façade (cement board on the façade):
3-1-metall fitting:


Implacemment of the vertical element (wall post) of 40*80 can:Because in most of the buildings curtain walls are made of light materials and beams of the classes are the only structural connection points, wall post is used to make connection between horizontal elements; and because full weight of the facade is on the structure, 40*80 can or the right element -depending on the designer’s calculations- is used.Implacemment of the horizontal element from 40*40 can:Because V&M galvanized profiles are placed vertically, horizontal elements from 40*40 cans are performed on wall posts up to 150 vertically distances. It is necessary to mention that implementing the horizontal elements as a crossroad will help align the substructure.

3-2-Galvanized substructure
:

M galvanized profile: This profile is made from galvanized sheet a thickness of 7 millimeter; and for dimensional control of Fiber Cement Board panels that is made due to moisture changes, is used. This profile is placed between two Fiber Cement Board panels. If this profile is used, seam between panels will remains visible; for covering this steam, A galvanized profile can be used. This profile connects to the metal substructure from the middle part, only by a screw.V galvanized profile: This profile is made from galvanized sheet a thickness of 7 millimeter and is used with M galvanized profile in modular and siding Fiber Cement Board façade’s substructure. According to the fact that the price of this structure is significantly lower than M profile, using this profile will reduce cost of substructure. This profile is screwed to the metal substructure from two sides.
3-3- Installing Fiber Cement Board
Running waterproof insulation (sealer) behind the panels:  Because Fiber Cement Board is totally made by cement, has good compatibility with water and wet environment, but because of using cement in combination and the property of absorbing water when saturated with moisture (directly, with vapor or humidity in the air) expands and when dried, contracts; and tension caused by increasing and decreasing length will cause problems on the connection points (screwed points).  To avoid this problem a special sealer behind the Fiber Cement Board’s panels is used and on the Fiber Cement Board’s panels primer and color will do this duty, to minimize moister absorption.You can also find out more about the installation of eyvanit’s Sheets
Cut in specific dimensions:
Fiber Cement Boards must be cut by cutting table machine to avoid non-homogenization and unbounding cutting location. Avoid cutting by milling machine. Granite blades are suitable for cutting this stuff and other sheets cannot be used.
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