EN
CEMENT-BONDED
PARTICLE BOARDS

CEMENT-BONDED PARTICLE BOARDS (CBPB) TAMAK

Cement-bonded particle boards (CBPB) are solid plates having smooth and hard surface used in dry assembly technology. The thickness varies from 10mm to 36mm.
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High quality of CBPB is guaranteed by a strict quality control in accordance with the national standards (GOST 26816-86) (CBPB-1 higher quality) and European standard EN 634-2

Type of an applied construction Thickness, mm
1. Frame partitions (trimming) 8, 10, 12, 16, 20, 24
2. Facing of columns, cross-beams 8, 10, 12, 16
3. Outer frame walls (trimmings)     10, 12, 16, 20, 24
4. Sheet-backing coat for plane roof           12, 16, 20, 24
5. Attic floor           12, 16, 20, 24
6. Basement for floors                      20, 24, 36
7. Window sill slab                            24, 36

ECOLOGICAL SAFETY

CBPB is an ecologically sound material. The main binder is cement and therefore cement-bonded particle boards do not contain dangerous phenol and formaldehyde bonding substances, asbestos and other poisonous stuff.

CBPB TAMAK are made by pressing moulded mixture, consisting of coniferous wood chips, Portland cement, mineral substance and water.

Cement-bonded particle boards

Percentage of production mixture components, considering the total volume, is the following:

Cement-bonded particle boards

A plate is a hard monolith material. Emitting of dust, gas or vapour from the plates is impossible in connection with mineralization of contained substances and applied technology of production.

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FIRE SAFETY

Cement-bonded particle board is referred to the group of substances which are difficult to ignite and do not spread fire. Being exposed to fire the boards do not emit toxic gases and vapour.

Cement-bonded particle boards

Experiment for fire resistance of a ventilated facade structure with CBPB TAMAK trimming 8mm
(class 0, GOST 31251-2003). 45 min.

Comparative characteristics of fire safety

Indexes CBPB OSB
Group of combustibility 1 low combustible 4 highly combustible
Group of inflammability 1 hardly flammable 3 easily flammable
Group of flame propagation 1 non-propagating moderate propagating
Smoke-forming ability 1 low 3 high
Toxicity hazard class
of combustion products
1 low-hazard 3 high-hazard

RELIABILITY

CBPB is first of all a constructional material that gives hardness to frame constructions. During the process of production a cement-bonded particle carpet is formed out of four layers: exterior layers of small-sized, interior out of bigger chip fractions. Then the carpet is subjected to pressing.

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Testing CBPB 12 mm for ultimate loads of secondary structures. Total weight is 406,5 kg, two points of support.
Fixtures, used when testing.
Flexural testing CBPB 24 mm. Width 600 mm, ultimate load 350 kg.

It is worthwhile mentioning one more property a possibility to use building constructions with CBPB trimming in earthquake-prone zones and buildings with a big number of storeys.

Cement-bonded particle boards

After the earthquake in Spitak (Armenia) in December 1988 TsNIISK conducted all kinds of research concerning the experience of erecting wooden panel houses in earthquake-prone zones. TsNIISK worked out a construction of a strengthened load-bearing panel on a wooden frame using trimmings out of CBPB and also the methods of connecting it with a foundation. Principal construction is applied until now. When building multi-storey houses in Krasnodar kray such kind of earthquake-prone constructions passed non-departmental expertise and an expertise of TsNIISK named after Kucherenko successfully.


MOISTURE RESISTANCE

CBPB are mostly used for trimming panels with a wooden frame in low-storey house building (fig. 5). The plates not only enhance wooden frames with additional stiffness, but also serve as defense from atmospheric actions. Bearing and fencing constructions of a house with CBPB trimming because of their smooth surface do not demand additional treatment. That is why for outer house trimming exterior wall surfaces are just enough to be painted.

Cement-bonded particle boards

CBPB have a substantial advantage concerning water absorption as compared to other plate materials. For further details see the article.


BIOSTABILITY

CBPB sustains fungus, pruners, gnawing animal action. It is important to notice that this biostability is achieved not due to including as a component of CBPB some special antiseptic agents and not due to surface treatment with antiseptic agent. Antiseptic is formed in the mass of CBPB itself in the process of turning cement into concrete, because an additional product of this process is calcium hydroxide that makes strongly alkaline media preventing growth of fungus.


FROST RESISTANCE

Frost resistance is one of serious advantages of CBPB, expending the use geography.

Cement-bonded particle boards

Thus, specified value of flexural strength reduction after 50 cycles does not exceed 10%. As a matter of practice an indicator of these values is lower. Long experience of use of constructions with CBPB in the building of different destination in Yakutia, Khanty-Mansisk proved high exploitation properties of the material.







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