1
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Raw Materials
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Cement, fly ash, water and Air entraining agents
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Locally avaiable clay
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Cement, lime, specially grinded sand, foam
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2
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Size
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400-600mm X 200mm X 150mm – 300mm
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225mm X 75mm X 100/150mm
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400-600 x 200 x 100/150/200 mm
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3
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Variation Size
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1.5 mm (+/-)
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5 mm (+/-)
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5 mm (+/-)
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4
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Compressive Strength (As per IS codes)
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3-4 N/mm2
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3.5 N/mm2
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2 -2.5 kg/cm2
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5
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Dry Density (As per IS codes)
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550-650 kg/m3 Its one-third of the weight of clay brick which makes it easy to lift and transport
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1800 kg/m3
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800 kg/m3
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6
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Cost Benefit
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For high rise buildings there will be reduction of Dead weight which leads to saving in Concrete and steel quantities.
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As easily available in local market hence it is beneficiary for low rise structure.
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For high rise buildings there will be reduction of Dead weight which leads to saving in Concrete and steel quantities.
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7
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Fire Resistance (8″ Wall)
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Upto 4 Hours
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Around 2 Hours
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Around 4 Hours
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8
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Quality of End Product
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Factory made product. So the quality of end product is consistent and good
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Locally made product. Quality depends on various parameters like quality of raw materials used, process of manufacture etc.,
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The quality of the end product depends on the foam used and degree of quality control
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9
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Sound Insulation
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Better Sound absoprtion/insulation as compared to bricks
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Normal
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Better Sound absoprtion/insulation as compared to bricks
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10
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Energy Saving
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Low thermal conductivity (0.24 Kw-M/C) helps in saving electricity costs 30% for heating and cooling of house
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High thermal Conductivity (0.81 Kw-M/C). So no significant cost savings
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Low thermal conductivity (0.32 Kw-M/C) helps in saving electricity costs 30% for heating and cooling of house
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11
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Environmental Friendliness
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In AAC Block there is no top soil consumption and it emits very low Carbon dioxide as compare to Red clay bricks while manufacturing
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One sq ft of carpet area with clay brick walling will consume 25.5 kg of top soil (approx). It actually damages environment
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In CLC Block there is no top soil consumption and it emits very low Carbon dioxide as compare to Red clay bricks while manufacturing.
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12
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Internal and External Plaster
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As these bricks have dimensional accuracy, the internal and extenal plaster thickness can be reduced
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Requires thick plaster surface as there are variations in the dimensions
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As these bricks have dimensional accuracy, the internal and external plaster thickness can be reduced
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13
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Finishing
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excellent
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Very bad
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Not linear
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14
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Joining Process
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Chemical mortars can be used for joining the brick. This reduces the material consumption fo cement and also avoids curing process
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Traditional mortar needs to be used and the brick work should be cured atleast for 7 days before plastering
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Chemical mortars can be used for joining the brick. This reduces the material consumption of cement and also avoids curing process.
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15
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Availability
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Factory setup cost is high.Not many factories, so availability is a concern.
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Available locally in all cities and villages.
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Factory setup cost is low as compared to AAC. Also takes long time to produce if steam curing is not used.Timely availability is a concern.
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16
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Thermal Insulator
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AAC Blocks are very good thermal insulator if cooling is an major component of any building monthly expenses it will save cost for entire lifetime
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It have low thermal insulation as compare to AAC and CLC Block
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CLC Blocks are very good thermal insulator if cooling is an major component of any building monthly expenses it will save cost for entire lifetime
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17
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Tax Contribution
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GST REFUNDABLE
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No Tax Contribution
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GST REFUNDABLE
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18
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Cylindrical Structures
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For Cylindrical structure these blocks are not much useful
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Cylindrical manholes or sewage chambers need small size of bricks so that the curvature can be formed hence Red clay bricks are useful
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For Cylindrical structure these blocks are not much useful
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19
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Water Absorption
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Absorb 12- 15% by total volume of AAC blocks
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Absorb 17 -20% by total volume of red clay brick
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Absorb 12-15% of water by total volume of Block
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20
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Range of Application
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They are suitable for Non load bearing or RCC structure in partition wall
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They are useful in both load bearing and non load bearing structure
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They are suitable for Non load bearing or RCC structure in partition wall
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