20 kg concrete is in wet condition so we have to add 40 to 60% to convert it in to dry condition then we have calculate the raw materials required right?
Great explanation and theory and math. But at the end of the day you didn't measure the slump of your concrete with all the agregate falling from the top when removing the cone. maybe the proportions of the mix have to be reconsidered.
Sir...3rd time ke tamping ke bad b aapne concrete fill kiya aur uske bad cone nikal ke measure kiya ye sahi hai? ...Ya fir 3rd tamping ke bad concrete fill hi nhi krna aur cone niklake measure krna sahi hai ?
Sure, i am also planning to make some soil experiments, but could not get time to do so., Hopefully I will prepare videos for soil tests also . thanks for your response
Are you following the ASTM international standard? First off that concrete course aggregate looks over 2 inches. If that’s the case, you need to put it through a two inch sieve. Next, it looked like you didn’t tamp 25 times even though you said you should. Also when the third layer goes under the top of the slump cone you should stop tamping, fill it to the top again, and then continue counting where you left off, then you lifted the cone way too fast. You should finish lifting between 3 and 7 seconds. But what really shows that this wasn’t done right was that the slump sheared showing that the test was invalid. Don’t teach people how to do things wrong please. Especially when it comes to something as important as concrete.
(1) try to keep the height of each layer of concrete while filling to the pre-fixed marks(circular lines) corresponding to each volume of concrete inside the cone. (2) try to keep the pre-fixed quantity and numbers of scooping during each layer's filling to meet the three equal volumetric layers. The key point is not in length(height) but volumetric three layers(three equal volumetric layers).
If we find any grade of concrete to use this mass 20 kg? Like M20 grade -1:1.5:3 Then, 1+1.5+3= 5.5 Mass of cement =(1/5.5) × 20. this is right . Ans it
Dear, mass of water is calculated. You may find it around 7m:44sec. If you are asking about why didn't we consider mass of water calculating 1+2+4.. I am sorry i couldn't understand your question clearly. kindly let me know, what exactly you would like to know!
Dear chiranjeev Rahul sir, kindly help me to answer my query. Sp. Grav. Of cement = 3.15 now den. Cement = 3.15×1000=3150 kg/m3 but den of opc cement is 1440kg/m3. Why is this difference??
Measurement of workability from Slump Test If shear slump or collapse slump occurs, the test should be repeated. We can get the result from the only true slump. We can classify the result within some ranges according to the slump value. Very low workability: slump value 0-25mm Low workability: slump value 25-50mm Medium workability: slump value 50-100mm High workability: slump value 100-175mm Reference: civiltoday.com/civil-engineering-materials/concrete/79-concrete-slump-test-standard-equipment-procedures-cautions
It is water cement ratio. we considered water cement ratio as 0.5, the weight of water to weight of cement is considered (amount of water = 50% of the weight of cement)
It depends on your Design Mix and Water Cement Ratio you have decided. such as 0.4; 0.5; ..... 0.85 something like this. Once you decide on water cement ratio you can calcuate the percentage from mass of the cement. For example, mass of cement = 1 kg and water cement ratio is 0.5, then mass of water shall be 0.5kg (0.5% of mass of cement). Hope this is clear. Thank you
Sir can I get the lab reports of any of the following experiments:- Exp. 1: Tensile Test of Steel(Fe 250 diameter 25mm) and HYSD (Fe 415D diameter 12mm). Exp. 2: Tensile and Compressive Test of Timber Details-(Perpendicular to the grain: 700mm×200mm×150mm.Parallel to the grain:600mm×150mm×150mm) Exp. 3: Shear Test of Steel and Timber. Exp. 4: Torsion Test of Steel. Exp. 5: Buckling Load of Columns with Various End Conditions. I am a 2nd year civil engineering student from nit Srinagar. Thank you
Dear , it is water cement ratio. we considered water cement ratio as 0.5, the weight of water to weight of cement is considered (amount of water = 50% of the weight of cement)
HI Iqbal, are you talking about total weight/mass of the concrete required to do this experiment. Volume of cone : 0.005495 cu.m density of concrete: 2400 kg/m3 so, from these I calculated mass of concrete : 2400 kg/m3 x 0.005495m3 = 13.188 kg considered wastage of concrete as 50%, though it is high, as we are mixing in concrete machine and considering the ease to conduct the experiment, i took wastage a bit high. Generally if it is hand mix, can take around 10-20% maximum. hence, 50% of 13.188 kg = 6.59 kg so, 13.188 + 6.59 = 19.78 kg which is rounded to 20 kg. kindly, please let me know what is your doubt exactly and i you find any mistake, please share it here. I am always ready to learn from mistakes. Thank you.
Hi dear Yakhub, sorry i did not understand your question exactly! but 1440 kg/cu.m is the UNIT WEIGHT of cement. I have considered the unit weight of concrete as 2400 kg/cu.m for the purpose of this calculation only.
Dear, this video was made only for lab experiment purpose. It is suggested to use it only for academic purpose and it was made for first semester students of Civil Engineering.
the video was really good.Thank you.
thanks for wonderful explanation
very good explanation sir thank you
nice.. sir and good explanation.
very clean explanation
Good information for civil. Team 👍💪
Thanks for indepth explaination sir
⏳thanks sir
Thanks ...Very Useful Video...
Good explanation sir
what if a wetter slump falls off of the plate but it measures 8 1/2" slump?
thanks for this wonderful teaching , may God continue to enrich you.
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Amazing video👌
U r the best
U said everything clearly
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Super sir, i'm expecting more videos from you.
Nice
supur sir good explanation
very helpful
Help us in mix design by practically by providing such experiments
Good I would like to know parts of the slamp cone
Very nice explain sir
Thank you sir
20 kg concrete is in wet condition so we have to add 40 to 60% to convert it in to dry condition then we have calculate the raw materials required right?
Great explanation and theory and math. But at the end of the day you didn't measure the slump of your concrete with all the agregate falling from the top when removing the cone. maybe the proportions of the mix have to be reconsidered.
Hey.Can i know the height between concrete and upper part of the cone to be the true slump?
Plz upload all the test
Sir if admixture is used how to calculate it??
very nice
if fly ash is added, please tell me how much quantity should be added?
Good
Sir...3rd time ke tamping ke bad b aapne concrete fill kiya aur uske bad cone nikal ke measure kiya ye sahi hai? ...Ya fir 3rd tamping ke bad concrete fill hi nhi krna aur cone niklake measure krna sahi hai ?
gradation of coarse aggregate ka video bhejo sit
good
sir used admixture i t calculate water required
Wet volume or dry volume?
Sir, make a video on soil test
Sure, i am also planning to make some soil experiments, but could not get time to do so., Hopefully I will prepare videos for soil tests also .
thanks for your response
Very informative..
#knowledgehubllt
1050m^2 convert into brass plz sir
well explained
Yah
Are you following the ASTM international standard? First off that concrete course aggregate looks over 2 inches. If that’s the case, you need to put it through a two inch sieve. Next, it looked like you didn’t tamp 25 times even though you said you should. Also when the third layer goes under the top of the slump cone you should stop tamping, fill it to the top again, and then continue counting where you left off, then you lifted the cone way too fast. You should finish lifting between 3 and 7 seconds. But what really shows that this wasn’t done right was that the slump sheared showing that the test was invalid. Don’t teach people how to do things wrong please. Especially when it comes to something as important as concrete.
Looks like 3/4. 3/4 can look pretty big when there's little fine aggregate/sand
I think they are not following any code shown by their treatment of materials 😂. But they may be following India standard code
Mast good best better
There was no wastage of concrete. Then why we 6.59kg additional.?
Not 3 layer. 4 layer mai fill kiya jata hai
why slump test
Sir plss explain how layer is determined... That first is complete, 2nd is complete.. And so on
(1) try to keep the height of each layer of concrete while filling to the pre-fixed marks(circular lines) corresponding to each volume of concrete inside the cone. (2) try to keep the pre-fixed quantity and numbers of scooping during each layer's filling to meet the three equal volumetric layers. The key point is not in length(height) but volumetric three layers(three equal volumetric layers).
According to ASTM C 143, 1/3 of the volume of the slump mold is the height of 70 mm from the bottom and 2/3 is 160 mm.
If we find any grade of concrete to use this mass 20 kg?
Like M20 grade -1:1.5:3
Then,
1+1.5+3= 5.5
Mass of cement =(1/5.5) × 20. this is right .
Ans it
Sir in this test filling the layer of a on rete is 4layer then temped with each layer 25 time you tell in this vedio only 3layer only
Europian EN standard 3x25
m20 grade h kya ye
Too much coarse aggregate in this mixture. Not advisable. Revised it.
Water taken as weight
sir plz sir step by step plz tell me sir
Why did you not take mass of water sir?
Dear, mass of water is calculated. You may find it around 7m:44sec. If you are asking about why didn't we consider mass of water calculating 1+2+4.. I am sorry i couldn't understand your question clearly. kindly let me know, what exactly you would like to know!
no issue sir for not considering mass of water while doing 1+2+4; thanks you very much for replying.
Dear chiranjeev Rahul sir, kindly help me to answer my query. Sp. Grav. Of cement = 3.15 now den. Cement = 3.15×1000=3150 kg/m3 but den of opc cement is 1440kg/m3. Why is this difference??
grade
Sir what is the nature of slump
Measurement of workability from Slump Test
If shear slump or collapse slump occurs, the test should be repeated.
We can get the result from the only true slump.
We can classify the result within some ranges according to the slump value.
Very low workability: slump value 0-25mm
Low workability: slump value 25-50mm
Medium workability: slump value 50-100mm
High workability: slump value 100-175mm
Reference: civiltoday.com/civil-engineering-materials/concrete/79-concrete-slump-test-standard-equipment-procedures-cautions
How many layers compacted...
3 layers.. each layer compacted with 25 blows and finally remained space is filled with concrete normally without any compaction.
@@chiranjeevirahulrollakanti7429
wrong please check code IS 1199...
4 layers 25 blows...k
Tnx alot sir..but I hv a Confusion of Water u hv tkn for half of cement weight..
w/c ratio is 0.5
It is water cement ratio. we considered water cement ratio as 0.5, the weight of water to weight of cement is considered (amount of water = 50% of the weight of cement)
How to take mass of water
It depends on your Design Mix and Water Cement Ratio you have decided. such as 0.4; 0.5; ..... 0.85 something like this. Once you decide on water cement ratio you can calcuate the percentage from mass of the cement. For example, mass of cement = 1 kg and water cement ratio is 0.5, then mass of water shall be 0.5kg (0.5% of mass of cement).
Hope this is clear. Thank you
sorry u don't know about ASTM
Wrong processor don't stomp to the single hand and
Sir can I get the lab reports of any of the following experiments:-
Exp. 1: Tensile Test of Steel(Fe 250 diameter 25mm) and HYSD (Fe 415D diameter 12mm).
Exp. 2: Tensile and Compressive Test of Timber
Details-(Perpendicular to the grain: 700mm×200mm×150mm.Parallel to the grain:600mm×150mm×150mm)
Exp. 3: Shear Test of Steel and Timber.
Exp. 4: Torsion Test of Steel.
Exp. 5: Buckling Load of Columns with Various End Conditions.
I am a 2nd year civil engineering student from nit Srinagar.
Thank you
what is 50 percent
Dear , it is water cement ratio. we considered water cement ratio as 0.5, the weight of water to weight of cement is considered (amount of water = 50% of the weight of cement)
Mr.Chiranjeevi Rahul ok thank you brother. :)
Tapping by rod is wrong
Do it proper way
Sorry sir but total weight is 21.425
HI Iqbal, are you talking about total weight/mass of the concrete required to do this experiment.
Volume of cone : 0.005495 cu.m
density of concrete: 2400 kg/m3
so, from these I calculated mass of concrete : 2400 kg/m3 x 0.005495m3 = 13.188 kg
considered wastage of concrete as 50%, though it is high, as we are mixing in concrete machine and considering the ease to conduct the experiment, i took wastage a bit high. Generally if it is hand mix, can take around 10-20% maximum.
hence, 50% of 13.188 kg = 6.59 kg
so, 13.188 + 6.59 = 19.78 kg which is rounded to 20 kg.
kindly, please let me know what is your doubt exactly and i you find any mistake, please share it here. I am always ready to learn from mistakes. Thank you.
sir u told that concrete mix is another but ... then what is 1440 cum
Hi dear Yakhub, sorry i did not understand your question exactly! but 1440 kg/cu.m is the UNIT WEIGHT of cement. I have considered the unit weight of concrete as 2400 kg/cu.m for the purpose of this calculation only.
This concrete not able to pumping. this is totally wastage.
Dear, this video was made only for lab experiment purpose. It is suggested to use it only for academic purpose and it was made for first semester students of Civil Engineering.
many things are wrong ...... where is the wet volume calculation .... not a helpfull video
Lol !! Who takes water in kg
G
Thanks sir