UTC AAC BLOCK FEATURES

  • Eco-Friendly
  • Light Weight – 1/3 of Brick
  • Earthquake Resistance
  • Sound Resistance
  • Fire Resistance
  • Load Resistance
  • Pest & Termite Resistance
  • Reduce joint and mortar
  • Moisture Resistant/Effloresence
  • Cost Saving/Easy To use
  • Fast Construction

SPECIFICATIONS : CONFORMING TO INDIAN STANDARDS IS:2185 (Part-3)-1984

S.No. PARAMETER UNIT VALUES
1. Size(Dimensions)
Length
Height
Width
mm
mm
mm

625(approx 25")
240(approx 9.7")
100,125,150,175,200,230,250,300
4", 5", 6", 7", 8", 9", 10", 12" (approx)
2. Precision In Size(Tolerance Limit
Length
Height
Width
mm
mm
mm
+- 1.5
+- 1.0
+-1.5
3. Density Kg/m 551-650
4. Compressive Strength N/mm 3-5
5. Thermal Conductivity(K-value) W/m.k 0.16-0.24
6. Drying Shrinkage % 0.04-0.10
7. Modulus of Elasticity Mpa 2040
8. Sound Absorption db 40-45 (For 200mm thick wall)
9. Water Absorption Coefficient Kg/mxh 4-6
10. Fire Resistance Hours 4-6 Hour (For 200 mm thick wall)

COMPARSION BETWEEN AAC BLOCKS & CLAY BRICKS

S. No. PARAMETER AAC BLOCKS CLAY BRICKS
1. Size 600mm x 200mm x 100-30mm 230 mm x 115 mm x 75 mm
2. Precision in Size Variation in Length & Width : 1.5 mm
Variation in Height : 1.0 mm
Variation in Length & Width : 10 mm
Variation in Height : 5 mm
3. Material Composition Cement, Lime, Fly Ash, Gypsum,Aluminium & Water. No problem of efflorescence. Soil is used which contains many inorganic impurities like sulphates etc. which result in eflorescence
4. Baking Done in Autoclaves with High Presure steam at 190°c & AAC Blocks are ready for use in 12 - 14 hours. Done in clay kilns & takes months for final use.
5. Surface Quality (Fungus Problems) Neat, clean, smoth surface finish without any fungus. Fungus & Salinity Problems on the surface (Reh)
6. Compressive Strength 3-5 N/mm 2.5-3.0 N/mm
7. Dry Density 551-650 Kg/m (Oven Dry) 1900-230 Kg/m
8. Wet Density Approx. 80-850 Kg/m Approx. 2400 Kg/m
9. Fire Resistance 4-6 Hours for 200 m thick wall 2 Hours for 230 thick wall
10. Sound Reduction 40-45 db for 200mm thick wall More than 45 db for 230 mm thick wall
11. Thermal Conductivity Approx. 0.16-0.24 W /m.k Approx. 0.81 W /m.k
12. Adaption to Various Surface Finishes Smoother surface result in better coating applications Inconsistent Surface
13. Construction Time Very high speed in construction due to bigger size & light weight. So 50% construction time is reduced as compared to bricks. Double time required as compared to AAC Blocks
14. Energy Saving 30% Load reduced on HVAC as Heating & Cooling wil come down there by saving on electricity bill upto 20% No Saving
15. Wastage Negligible Upto 20%
16. Cost Benefit Factor One third weight of bricks. So dead load of building is reduced. Approx 20-26% can be saved on concrete % steel reinforcement. No Saving
17. Contribution to Carpet Area 3-5 % increase in carpet area No Saving
18. Tax Contribution Contributes to the Government Taxes in form of central Excise, VAT & Octroi. Does not Contribute to Government exchange (Taxes)
19. Transportation & Handling Easier & Economical for transportation & Handling due to light weight. Difficult & Costly for transportation & handling as compared to AAC Blocks.
20. Quality Uniform & smooth finished product made with state-of-the-art technology in fully automatic block plant under controlled quality parameters. Inconsistance in size, shape & variation in quality. Bricks are generally made in unorganized sector manually by unskilled workers.
21. Green Building Contributes to green building as it is Eco-friendly product (use fly ash) Contributes to pollution as co emission are very high.

Do's&Don'ts

S.No. Do's Don'ts
1. AAC Blocks should be wetted with brush/cotton cloth before joining with mortar. AAC Blocks should not be soaked in water like bricks for a long time.
2. The mortar mix should be 1;6 (cement:sand) Rich mortar mix such as 1;4(cement;sand) should not be used.
3. The mortar thickness should be limited to 10-12 mm The mortar thickness should be more than 12mm.
4. Use mechanical tools such as stone cutting machine or carpentry hack saw with big tooth for cutting. Chisel and hammer should not be used for cutting blocks.
5. The internal plaster should be 10mm thickand external plaster should be 15mm thick. The internal plaster should not be more than 10mm thick and external plaster should not be more than 15mm thick.
6. The recess joints should be made while constructing wall for better bonding of plaster with masonry. The joints should not be finished flush with surface masonry.
7. Only mortar joints of masonry should be cured with water. Full wall should be flooded with water for curing like bricks.