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CEMENT-BONDED PARTICLE BOARDS CHARACTERISTICS

TAMAK CBPB Nomenclature

Size, mm Weight
of 1 sheet, kg		 Sheet
area, m2		 Sheet-
cubiccontent, m3		 Number of
sheets in 1 m3		 Weight
1 m3, kg
length width thickness
2700 1250 8 36,45 3,375 0,0270 37,04 1300-1400
10 45,56 0,0338 29,63
12 54,68 0,0405 24,69
16 72,90 0,0540 18,52
20 91,13 0,0675 14,81
24 109,35 0,0810 12,53
36 164,03 0,1215 8,23
3200 1250 8 43,20 4,000 0,0320 31,25 1300-1400
10 54,00 0,0400 25,00
12 64,80 0,0480 20,83
16 86,40 0,0640 15,63
20 108,00 0,0800 12,50
24 129,60 0,0960 10,42
36 194,40 0,1440 6,94

Physico-mechanical properties of TAMAK CBPB

Property,
unit		 Rate
1. Density, kg/m3 1100 - 1400
2. Moisture, % 9 ± 3
3. Thickness swelling after 24 hours, %, max 1,5
4. Water absorption after 24 hours, %, max 16
5. Bendingstrength, МPа, min
 
for thickness up to 12 mm
for thickness 12–19 mm
for thickness greater than19 mm
 
12
10
9
6. Tensile strength perpendicularly to board plane МPа, min 0,5
7. Flexural modulus, МPа, min 4500
8. Impactstrength, J/m2 1800
9. Flammabilityclass Г1
10. Frost resistance (flexural strength reduction after 50 cycles), %, max 10
11. Roughness Rz concerning national standards (GOST 7016-82), mm, max for boards:
 
grinded
not grinded
 
320
0
12. Thickness limit deviation, mm, max, for boards:
 
grinded  
not grinded: 10 мм
  12 ÷ 16 мм
  24 мм
  36 мм
 
  ± 0,3
  ± 0,6
  ± 0,8
  ± 1,0
  ± 1,4
13. Length and width limit deviation of boards, mm: ± 3
14. Thermal conductivity coefficient, W/(m•K): 0,26
15. Coefficient of linear expansion, mm/(rm•°C) or degr.-1·10-6: 0,0235 или 23,5
16. Vapour permeability coefficient, mg/(m•h•Pа): 0,03

Reference parameters of ТАМАК CBPB physico-mechanical properties

№ Property,
unit		 Rate for CBPB-1 National
standart
1 Flex modulus, МPа, not less 4500 GOST 10635-88
2 Hardnessindex, МPа 46-65 GOST 11843-76
3 Impact elasticity, joule/m, not less 1800 GOST 11843-76
4 Resistivity against pulling screws out of plates, Н/m 4-7 GOST 10637-78
5 Specific heat capacity, k joule (kg С) 1,15 -
6 Classofbiostability 4 GOST 17612-89
8 Reduction of bending strength, % (after 20 cycles of thermal and humidity impact), %, not more 30 -
9 Thickness swelling (after 20 cycles of thermal and humidity impact), %, not more 5 -
10 Inflammability Low-flammable group G1 GOST 30244-94
11 Frost resistance, (reduction of bending strength after 50 cycles), %, not more 10 GOST 8747-88

Loading table of TAMAK CBPB “Continuous load – 1 field console”

Bay,
mm		 Load, kN
Thickness
8 mm		 Thickness
10 mm		 Thickness
12 mm		 Thickness
16 mm		 Thickness
20 mm		 Thickness
24 mm		 Thickness
36 mm
200 0,213 0,345 0,480 0,813 1,414 2,007 4,802
250 0,171 0,267 0,387 0,623 1,031 1,572 3,280
300 0,142 0,212 0,307 0,508 0,803 1,167 2,687
350 0,110 0,168 0,267 0,423 0,688 1,030 2,288
400 0,096 0,153 0,248 0,377 0,622 0,945 2,042
450 0,082 0,128 0,195 0,347 0,553 0,760 1,147
500 0,056 0,095 0,185 0,345 0,541 0,667 1,572

Thermalproperties

Due to wood and cement integrity in CBPB, the plates are made as homogeneous solid material without air droplets. This guarantees high thermal conductivity.That is why CBPB are used mostly in constructions where a combination of high strength and low temperature resistance of a material is needed. Thermal properties of CBPB are estimated with the help of thermal conductivity coefficient which is the most important thermal rate of constructional materials.

Thermal conductivity coefficient dependence on the plate thickness

Thicknessofplates, mm Thermal conductivity, W/m•°C Thermal resistance, m2•°C/W
8 0,26 0,031
10 0,035
12 0,046
16 0,062
20 0,077
24 0,092
36 0,138

Acoustic isolation

Isolation index of airborne noise

ТАМАК CBPB 10 mm RW=30 dB
ТАМАК CBPB 12 mm RW=31 dB

Isolation index of impact noise

Cement-bonded particle boards having thickness 20 and 24 mm, put on the reinforced bearing concrete floor of a measuring chamber in Research Institute of Construction Physics (NIISPh RAASN) provide improvement of isolation of impact noise for 16-17 dB correspondently.

When putting cement-bonded particle boards having thickness 20 and 24 mm not just on the reinforced bearing concrete floor, but on the intermediate layer of elastic soft material comes additional improvement of isolation of impact noise which makes up 9-10 dB.

Resistivity against pulling screws out of plates

№ Type
of a screw,
DxL, mm		 Hole diameter
under a screw, mm		 Average
resistivity out
of tests, N/mm		 Resistivity
spreading,
N/mm
1 5,5 х 30 3,0 122 118 ÷ 137
2 5,0 х 30 3,0 85 68 ÷ 103
3 4,5 х 30 3,0 93 80 ÷ 108
4 4,0 х 30
(L ofscrew 20 mm)		 2,5 110 88 ÷ 147
5 4,0 х 30
(L of screw total)		 2,5 114 103 ÷ 124
6 3,5 х 30 2,5 104 87 ÷ 116
      avg. 105  
 

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