How can check RMC plant for correct volume of concrete. Today I order 6m3 of RMC but actual volume casted on site 4.5 m3 that is 1.5 m3 shortage In concrete. So what's kind of possibility to shortage of concrete in TM
How to check RMC plant for correct volume of concrete
- Thread starter dhirajvarade
- Start date
Srinivasan
Prime CE
Kindly weigh the transit mixer with full load and empty truck.this will give you the weight of total concrete.divide the qty by 1450 u will get the volume
Whenever you are doing a large pour you must ask the vendor to do the weightment of atleast 5% of the total T.M to be received. This will give you the net weight of concrete loaded in the T.M this weight can be compared with the total weight of all the materials batched at the plant which is mentioned in the batch sheet.
This will also be useful to prepare the concrete yield report.
Generally we don't ask the vendor for weight slip for small quantities however if you feel the quantity received is less you can randomly ask the vendor to send the weight slip for T.M that way he will ensure that quantity dispatched to you is correct.
Another way to find out is if you are placing concrete with crane bucket you can check by no of bucket unloaded. If you are bucket size is of 1 cum you will receive anywhere between 5.5 to 6.5 buckets.
You can always keep a track on wastage done at the point of unloading from T.M and at the point of placing also so as to ensure shortage is not due to wastage of concrete.
Hope you understand.
Thanks
This will also be useful to prepare the concrete yield report.
Generally we don't ask the vendor for weight slip for small quantities however if you feel the quantity received is less you can randomly ask the vendor to send the weight slip for T.M that way he will ensure that quantity dispatched to you is correct.
Another way to find out is if you are placing concrete with crane bucket you can check by no of bucket unloaded. If you are bucket size is of 1 cum you will receive anywhere between 5.5 to 6.5 buckets.
You can always keep a track on wastage done at the point of unloading from T.M and at the point of placing also so as to ensure shortage is not due to wastage of concrete.
Hope you understand.
Thanks
A concrete mixing plant or concrete batching plant is widely used in concrete centralized stirring places. It is carried out according to different design and manufacturing requirements that meet the actual needs of the process so that each device with a distinct professional quality.
- Before checking, prepare enough standard weights and weigh materials.
- During the calibration process, a special operator, and their safety must be guaranteed.
- Conduct a visual inspection: measure management marks, explanatory marks, verification marks as well as taking into account safety measures, self-inspection procedures, and conditions of use.
- Set calibration of zero and peeling device accuracy.
- Conduct a bias load test.
- Conduct a weighing test.
- Conduct a Discrimination test.
- If the batching scale fails to reach the corresponding accuracy, it needs to be calibrated.
Dnyan Deshmukh
Staff member
Possibilities of such huge difference in the poured quantity vs supplied quantity.
1. Manufacturer did batching of 4.5 cum of concrete and printed a manipulated batch sheet of 6 cum - You should visit the rmc plant and watch for is ath auto batch report printing do happen after loading of transit mixer or the operator is doing manual printing of batch report (if batch report is manually printed then its further more problematic concrete in terms of its properties)
2. Calibration of the RMC Plant is gone for a toss - You can visit the plant and verify the calibration of all weight scales by instructing them to put a standard weight on each scale frame and see the reading on indicators, if both reading matches when load is increased gradually and for decreased loads too, then calibration of the plant is fine.
3. The driver of somebody is doing scam in between - this no body can control other than identifying those transit mixers which found to be less in quantity in most of the time and instructing the RMC plant for not sending those TM to your site.
4. Transit mixer condition - if the transit mixer is having huge amount of concrete stuck on its drum, it will reduce the volume of the drum, it will absorb the water present in concrete (for first concrete load and will also keep ill impact for a day), this will also reduce your volume of concrete by great extent and will also impact on the workability of the concrete. on higher gradient roads such transit mixer do spill the concrete out of drum due to less volume could lead to reduction in concrete quantity.
5. If it keeps continuing, its time to change the supplier of the concrete for sure.
1. Manufacturer did batching of 4.5 cum of concrete and printed a manipulated batch sheet of 6 cum - You should visit the rmc plant and watch for is ath auto batch report printing do happen after loading of transit mixer or the operator is doing manual printing of batch report (if batch report is manually printed then its further more problematic concrete in terms of its properties)
2. Calibration of the RMC Plant is gone for a toss - You can visit the plant and verify the calibration of all weight scales by instructing them to put a standard weight on each scale frame and see the reading on indicators, if both reading matches when load is increased gradually and for decreased loads too, then calibration of the plant is fine.
3. The driver of somebody is doing scam in between - this no body can control other than identifying those transit mixers which found to be less in quantity in most of the time and instructing the RMC plant for not sending those TM to your site.
4. Transit mixer condition - if the transit mixer is having huge amount of concrete stuck on its drum, it will reduce the volume of the drum, it will absorb the water present in concrete (for first concrete load and will also keep ill impact for a day), this will also reduce your volume of concrete by great extent and will also impact on the workability of the concrete. on higher gradient roads such transit mixer do spill the concrete out of drum due to less volume could lead to reduction in concrete quantity.
5. If it keeps continuing, its time to change the supplier of the concrete for sure.
You have not mentioned the grade of concrete normally concrete weighs about 2400 kg/cum.*
So since you have ordered 6 cum the total weight of the concrete should be about 2400 x 6 = 14400 kg
Now when you weight the TM ( transit mixer ) it will show self-weight of TM + fuel inside the TM ( generally full tank is about 200 lit approx ) + water in the tank on TM ( 500 lit approx ) + any other material which is currently on the TM.
( please note that in case you intend to use large quantities then its better to weight all the TM's of that particular RMC suppliers by sending our reliable person which could be either storekeeper along with engineer once this is done you are aware of the approx weight of the TM as per their registration numbers, there is theft no matter how much you monitor it but if its a big project then ideally if we have our own weighing scale installed at the site then cases of cheating are controlled otherwise you can't do anything about it some amount of cheating is bound to happen.)
So considering a normal running TM of about 6 cum capacity it generally weights say about 10500 to 11000 kgs.
So when you first weigh the vehicle with concrete so ideally, the total weight should be 11000 kgs + 14400 kg =25400 kgs
After the concrete is discharged then again the vehicle should be weighed so now the calculation would be as follows:
Loaded weight of TM = 25400 kgs
Unloaded weight of TM = 11000 kgs
------------------------------------------------------------
Net weight = 14400 kgs
------------------------------------------------------------
So 14400 / 2400 = 6 cu.m
* Please note that depending on the grade of concrete being used generally the weight of concrete varies from 2400 kg/cum to 2450 kg/cum so derive your constants by maintaining the data for concrete received at site based on the RMC vendors.
One more way you can find if the correct amount of concrete was loaded in the TM was by seeing the BATCH MIX REPORT which comes along with the TM where you will see the material loaded in kgs and make an assumption.
Cheating is a way of life in India so you have to live with it, hence you have to be vigilant. Most of the customers don't weigh the TM and don't take precautions so that theft is minimized if you take care then such kind of cheating can definitely be arrested.
And the golden rule is always weighed each and every TM so the vendor knows that this party is vigilant and hence will not resort to cheating.
So since you have ordered 6 cum the total weight of the concrete should be about 2400 x 6 = 14400 kg
Now when you weight the TM ( transit mixer ) it will show self-weight of TM + fuel inside the TM ( generally full tank is about 200 lit approx ) + water in the tank on TM ( 500 lit approx ) + any other material which is currently on the TM.
( please note that in case you intend to use large quantities then its better to weight all the TM's of that particular RMC suppliers by sending our reliable person which could be either storekeeper along with engineer once this is done you are aware of the approx weight of the TM as per their registration numbers, there is theft no matter how much you monitor it but if its a big project then ideally if we have our own weighing scale installed at the site then cases of cheating are controlled otherwise you can't do anything about it some amount of cheating is bound to happen.)
So considering a normal running TM of about 6 cum capacity it generally weights say about 10500 to 11000 kgs.
So when you first weigh the vehicle with concrete so ideally, the total weight should be 11000 kgs + 14400 kg =25400 kgs
After the concrete is discharged then again the vehicle should be weighed so now the calculation would be as follows:
Loaded weight of TM = 25400 kgs
Unloaded weight of TM = 11000 kgs
------------------------------------------------------------
Net weight = 14400 kgs
------------------------------------------------------------
So 14400 / 2400 = 6 cu.m
* Please note that depending on the grade of concrete being used generally the weight of concrete varies from 2400 kg/cum to 2450 kg/cum so derive your constants by maintaining the data for concrete received at site based on the RMC vendors.
One more way you can find if the correct amount of concrete was loaded in the TM was by seeing the BATCH MIX REPORT which comes along with the TM where you will see the material loaded in kgs and make an assumption.
Cheating is a way of life in India so you have to live with it, hence you have to be vigilant. Most of the customers don't weigh the TM and don't take precautions so that theft is minimized if you take care then such kind of cheating can definitely be arrested.
And the golden rule is always weighed each and every TM so the vendor knows that this party is vigilant and hence will not resort to cheating.
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