| S.No | Parameter | AAC Blocks | Red Clay Bricks | CLC Blocks |
|---|
| 1 | Raw Materials | Cement, fly ash, water and Air entraining agents | Locally avaiable clay | Cement, lime, specially grinded sand, foam |
| 2 | Size | 400-600mm X 200mm X 150mm – 300mm | 225mm X 75mm X 100/150mm | 400-600 x 200 x 100/150/200 mm |
| 3 | Size Variation | 1.5 mm (+/-) | 5 mm (+/-) | 5 mm (+/-) |
| 4 | Compressive Strength (As per IS codes) | 3-4 N/mm2 | 3.5 N/mm2 | 2 -2.5 kg/cm2 |
| 5 | Dry Density (As per IS codes) | 550-650 kg/m3 Its one-third of the weight of clay brick which makes it easy to lift and transport | 1800 kg/m3 | 800 kg/m3 |
| 6 | Cost Benefit | For high rise buildings there will be reduction of Dead weight which leads to saving in Concrete and steel quantities. | As easily available in local market hence it is beneficiary for low rise structure. | For high rise buildings there will be reduction of Dead weight which leads to saving in Concrete and steel quantities. |
| 7 | Fire Resistance (8″ Wall) | Upto 4 Hours | Around 2 Hours | Around 4 Hours |
| 8 | Quality of End Product | Factory made product. So the quality of end product is consistent and good | Locally made product. Quality depends on various parameters like quality of raw materials used, process of manufacture etc., | The quality of the end product depends on the foam used and degree of quality control |
| 9 | Sound Insulation | Better Sound absoprtion/insulation as compared to bricks | Normal | Better Sound absoprtion/insulation as compared to bricks |
| 10 | Energy Saving | Low thermal conductivity (0.24 Kw-M/C) helps in saving electricity costs 30% for heating and cooling of house | High thermal Conductivity (0.81 Kw-M/C). So no significant cost savings | Low thermal conductivity (0.32 Kw-M/C) helps in saving electricity costs 30% for heating and cooling of house |
| 11 | Environmental Friendliness | In AAC Block there is no top soil consumption and it emits very low Carbon dioxide as compare to Red clay bricks while manufacturing | One sq ft of carpet area with clay brick walling will consume 25.5 kg of top soil (approx). It actually damages environment | In CLC Block there is no top soil consumption and it emits very low Carbon dioxide as compare to Red clay bricks while manufacturing. |
| 12 | Internal and External Plaster | As these bricks have dimensional accuracy, the internal and extenal plaster thickness can be reduced | Requires thick plaster surface as there are variations in the dimensions | As these bricks have dimensional accuracy, the internal and extenal plaster thickness can be reduced |
| 13 | Cost of Construction | 1 Cum costs – Rs. 4200/- | 1 Cum costs – Rs. 2440/- | 1 Cum costs – Rs. 4000/- |
| 14 | Joining Process | Chemical mortars can be used for joining the brick. This reduces the material consumption fo cement and also avoids curing process | Traditional mortar needs to be used and the brick work should be cured atleast for 7 days before plastering | Chemical mortars can be used for joining the brick. This reduces the material consumption of cement and also avoids curing process. |
| 15 | Availability | Factory setup cost is high.Not many factories, so availability is a concern. | Available locally in all cities and villages. | 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. |
| 16 | Thermal Insulator | 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 | It have low thermal insulation as compare to AAC and CLC Block | 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 |
| 17 | Tax Contribution | Contributes to Government taxes in form of Central,Excise,VAT and octroi | No Tax Contribution | Contributes to Government taxes in form of Central,Excise,VAT and octroi |
| 18 | Cylindrical Structures | For Cylindrical structure these blocks are not much useful | Cylindrical manholes or sewage chambers need small size of bricks so that the curvature can be formed hence Red clay bricks are useful | For Cylindrical structure these blocks are not much useful |
| 19 | Water Absorption | Absorb 12- 15% by total volume of AAC blocks | Absorb 17 -20% by total volume of red clay brick | Absorb 12-15% of water by total volume of Block |
| 20 | Range of Application | They are suitable for Non load bearing or RCC structure in partition wall | They are useful in both load bearing and non load bearing structure | They are suitable for Non load bearing or RCC structure in partition wall |
