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            | CONCRETE DOOR FRAMES   |  
            | System Components   | Initial Cost Structure   |  
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            | Critical Factors   1. Curing 2. Quality of sand for concrete 3. Provision of holes at the right place for
     fixing door shutters 4. Holes for fixing the door shutter
   | Tools Used   1.   Trowel 2.   Wooden float 3.   Straight float   |  
            | DO’S | DON’T’S |  
            | 1. Frames should be cured for 14 days 2. Mortar should be used within 30
     minutes of adding water to mix 3. Frames should be stacked properly
   | 1. Cavities should not be left in the frame      during casting 2. Fine sand should not be used
 3. Excess water should not be added to
     the concrete   |  
            |                                                    Construction Process             |  
            | Take measured quantities of cement, sand and aggregates and mix the concrete | Clean and assemble the mould | Place reinforcement in the mould and fill concrete | Insert a PVC pipe at the center of the post to fix door latch |  
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            | Compact the concrete with trowel to get uniform thickness to the frame | Remove the mould    | Finish the edges with straight edge | Finish the edges with wooden float |  
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            | Clean the concrete from the PVC pipe provided for the door latch | Make hole on the post to fix door hinges | Cure the frames for 14 days |  Stack the frames |  
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            | Erect RCC door frames in the house | A house with a RCC door frame | A house with RCC door frame with wooden shutters |   |  
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