Technical Specification of Interlocking Blocks
| HF 220 Interlocking/ Conduit/ Plain | HF150 | |
| Use | External walls/Fencing/Load bearing constructions | Interior/Partition Walls/Framed Constructions |
| Width | 220 mm (9 inch) | 150 / 115mm (6/4.5 inch) |
| Height | 115 mm | 115 mm |
| Length | 120 mm to 240 mm | 120 mm to 240 mm |
| Weight | + – 11 Kg (Full block) for SCEB; + – 8 kg (full block) for fly Ash blocks | 5.5-7 kg approx |
| Application | By size, one HF220 is equivalent to three to three & half size of conventional fired bricks. Other sizes are also available. | |
Raw Material for making blocks
The blocks can be made in Hydraform machine using Fly ash – Lime – Gypsum – Cement- Sand (Fal-G), other fly Ash based combination OR Soil-Cement (Compressed Stabilized Earth Blocks SEB) OR Stone Dust – Cement.
Mix Design
Different mix designs can be made to suit the quality, cost of raw material and compressive strength of blocks required. Eg. the blocks have been successfully made using following combinations :
Fly ash Cement Block
- Fly ash = 35% – 60%
- Coarse sand = 35% – 70%
- Stabilizer = 8% – 15% (including lime, cement, gypsum)
Stabilized Earth Block
- Soil = 60 – 70%
- Coarse sand = 20 – 30%
- Cement = 8 – 10%
Note: The mix ratio will require to be fine tuned based on above factors.We can provide mix design assistance in this respect.
Block Strength
The block strength is determined by nature of Soil / Fly Ash , quantity of Cement and other materials used . The water curing after manufacture of blocks plays a important role in final compressive strength and quality of blocks.
In past we have obtained results as indicated below:
| Soil – Cement Blocks | Fal-G – C. Sand | ||
| Cement Content | Strength | Cement Content | Strength |
| 8% | 4 to 5 MPa | 8% | 7 to 8 MPa |
| 10% | 7 to 8 MPa | 10% | 12 to 13 MPa |
| 1 MPa is equal to 10 Kg / Sq. cm | |||
Thermal Quality
It can be up to 3 times better than conventional brick masonry.
Water Absorption
Good quality blocks can be made from Hydraform machine to give:
- For Fly Ash- Cement: Up to 15%.
- For Stabilized Earth Block: Up to 12%.
Block Finish
Block finish is very good and compares even better than face brick finish. It provides option to keep the wall with or without plaster. In case of without plaster, the wall could be given a groove pointing / varnish / sili-coat or tereline coat to protect against weathering effect.
Conduiting
Conduiting can be done using Conduit blocks. Alternatively conventional chase cutting also possible
Block Making
This involves the following steps:
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| Loading the soil | Mixing, soil, cement and water |
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| Loading the Hydraform machine | Carrying the block |
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| Stacking and curing the blocks | Laying the blocks |
ADVANTAGES OF INTERLOCKING BLOCKS OVER CONVENTIONAL BRICK/CONCRETE MASONRY
- Interlocking Blocks save on Mortar & Plaster cost
- High Finish Design & Aesthetics
- Faster Construction
- Simplicity of Use
- Cost Efficient
- High Quality Product
- Environment Friendly – No Burning of Bricks required
- Option to Use Waste materials / Fly Ash / Marble Slurry powder / Rice Husk ash / Concrete mix with chips up to 4 mm
- Minimum mortar required
- Independence to make at site of construction
- Training and technical support
- International proven product used in 45 countries
- Can be used without plastering
- Fly ash blocks can be Lighter than conventional masonry
- Suitable for earthquake resistant construction
- Local / Unskilled labour can be constructed
- Conduits / Plumbing possible
