How to calculate the quantity of water for a given mix concrete. As it would be required to calculate for mix 1:2:4.
Basic differences PCC RCC Plain Cement Concrete R/f Cement Concrete It doesn’t carry ‘Steel’. It carries Steel. PCC is weak in tension loading while strong in compression loading. RCC is strong in both. PCC blasts on excessive loading & in an instant w/t giving any warning. RCC gives you enoughRead more
Basic differences
| PCC | RCC |
| Plain Cement Concrete | R/f Cement Concrete |
| It doesn’t carry ‘Steel’. | It carries Steel. |
| PCC is weak in tension loading while strong in compression loading. | RCC is strong in both. |
| PCC blasts on excessive loading & in an instant w/t giving any warning. | RCC gives you enough time to vacate the structure before collapse. |
| Plain Cement Concrete | R/f Cement Concrete | |
| Tension | Steel tendons
High tensile steel bars Included with tension |
Ordinary Mild Steel Deformed Bars
No tension included |
| Basic materials used | Min grade of concrete
Post-Tensioning → M30 Pre-Tensioning → M40 to resist high stresses
High strength steel to transfer large prestressing force |
Min grade of concrete → M20
Steel → MS |
| Effectiveness of member | Entire section carries load | Does not carries load |
| Crack resistance | High
Cracks don’t occur under working loads |
Less |
| Wt & suitability | Light
Heavy loads & longer spans |
Heavy
Wt is more desired than steel |
| Equiments | Requires many specialized equiments
Pulling jack, Post-tensioning pump, Master wedges, Anchhor head & bearing |
Doesn’t involve specialized equiments. |
| Quality of steel reqd | 1/3rd of RCC
More strength & less c/s area |
More |
| Deflection | Very less | More |
| Load carrying capacity & Durability | More | Less |
| Shock resistance | More | Less |
| Yield | As high as 2100 N/mm2 | 200 – 300 N/mm2 |
| Testing | Testing of steel & concrete can be done while prestressing. | No way of testing the steel & concrete. |
| Cost | Economical for span of 10m – 18m.
As length of span gets ↑ Cost % ↑ C/s area of beam ↓ |
Economical for span < 9m. |
Preet Chovatiya
As we know 1:2:4 ratio is for M15 concrete. Generally Water quantity is calculated as per below formula: Water Quantity=W/C ratio*Cement Quantity Generally W/C ratio is lays between 0.4 to 0.6 as per IS 10262(2009). Now first we have to assume cement quantity, so let's assume cement quantity=50 KG aRead more
As we know 1:2:4 ratio is for M15 concrete. Generally Water quantity is calculated as per below formula:
Water Quantity=W/C ratio*Cement Quantity
Generally W/C ratio is lays between 0.4 to 0.6 as per IS 10262(2009).
Now first we have to assume cement quantity, so let’s assume cement quantity=50 KG and W/C ratio=0.5
Now let’s calculate water quantity for 50 KG cement.
Water Quantity=0.5*50=25 liter.
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