How to measure yield of concrete at site and plant... to measure how much actual volume of concrete dispatched and rectification if yield is minimum and maxmimum.
TO MEASURE YIELD FOLLOWING APPARATUS REQUIRE:
Cylinder - 10 ltr capacity
Tamping rod
Balace - 100 kg capacity
scoop, wheel barrow etc.
Procedure
1) Determine the actual volume of 10 ltr cylinder by filling it by distill water after taking tare wt. of cylinder, after derive water wt. by subtracting total wt. of cylinder and water with cylinder wt. devide it from density of water which is 1000 kg/ m3. Hence we get actual volume of cylinder.
2) Fill the concrete in cylinder thickness of one layer is 50 mm and tamping must not less than 60 times in the case of 10 ltrs cylinder, fill the cylinder by repeat above procedure, strike excessive concrete from cylinder and side of cylinder must be tamped 10 to 15 times so that no large bubble appears on the surface.
3) Determine wt. of concrete in cylinder by subtracting total weight to cylinder tare weight.
4) Apply formula :
density = mass of concrete / volume of cylinder
Let mass of concrete= 24.040 kg
and volume of cylinder = 0.01 m3
Than density of concrete
24.040/ 0.01 = 2404 kg/m3
THAN YIELD OF CONCRETE
Theoretical density/ Practical density
we derive practical density above which is
2404 kg / m3
For theoretical density we need batchsheet which is come during dispatch of concrete
Let total quantity of concrete dispatched is 5 m3 and weight of concrete is 12500 kg for 5m3 concrete as per batchsheet.
Than Theoritical density is
12500/ 5 = 2500 kg / m3
Hence yield = 2500/2404
= 1.03
SO THAT OUR YIELD IS 1.03 WHICH INDICATES WE GIVE MORE CONCRETE
AND HOW MUCH IS GIVEN BELOW
= 1.03 × 5 = 5.15 m3
i.e we produce 0.15 m3 more in the case of 5 m3 concrete.
Yield of concrete must be between
0.98 to 1.02
Cause of more volume of concrete is low specific gravity of aggregate and may also due to problem in calibration of plant.
To rectify this we can reduce quantity of aggregate in mix design .
TO MEASURE YIELD FOLLOWING APPARATUS REQUIRE:
Cylinder - 10 ltr capacity
Tamping rod
Balace - 100 kg capacity
scoop, wheel barrow etc.
Procedure
1) Determine the actual volume of 10 ltr cylinder by filling it by distill water after taking tare wt. of cylinder, after derive water wt. by subtracting total wt. of cylinder and water with cylinder wt. devide it from density of water which is 1000 kg/ m3. Hence we get actual volume of cylinder.
2) Fill the concrete in cylinder thickness of one layer is 50 mm and tamping must not less than 60 times in the case of 10 ltrs cylinder, fill the cylinder by repeat above procedure, strike excessive concrete from cylinder and side of cylinder must be tamped 10 to 15 times so that no large bubble appears on the surface.
3) Determine wt. of concrete in cylinder by subtracting total weight to cylinder tare weight.
4) Apply formula :
density = mass of concrete / volume of cylinder
Let mass of concrete= 24.040 kg
and volume of cylinder = 0.01 m3
Than density of concrete
24.040/ 0.01 = 2404 kg/m3
THAN YIELD OF CONCRETE
Theoretical density/ Practical density
we derive practical density above which is
2404 kg / m3
For theoretical density we need batchsheet which is come during dispatch of concrete
Let total quantity of concrete dispatched is 5 m3 and weight of concrete is 12500 kg for 5m3 concrete as per batchsheet.
Than Theoritical density is
12500/ 5 = 2500 kg / m3
Hence yield = 2500/2404
= 1.03
SO THAT OUR YIELD IS 1.03 WHICH INDICATES WE GIVE MORE CONCRETE
AND HOW MUCH IS GIVEN BELOW
= 1.03 × 5 = 5.15 m3
i.e we produce 0.15 m3 more in the case of 5 m3 concrete.
Yield of concrete must be between
0.98 to 1.02
Cause of more volume of concrete is low specific gravity of aggregate and may also due to problem in calibration of plant.
To rectify this we can reduce quantity of aggregate in mix design .
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