Firstly, your video is the best I have seen on TH-cam so far, Thank you for making it easy to follow and understand. I have a question? How much water do I put into a mix for the concrete to be at its best? Question 2 What would be a time period to allow to cure, or walk on it? Question 3 My slab is a veranda and exposed to rain and the elements, is there an additive that I could put into the mix to waterproof the concrete? Again you are great. thank you
@gordonpeirce5967 thanks for your kind words of appreciation. It's quite heartwarming. 1. How much water to use? Well, a good water:cement ratio is about 0.5 ie 25kg (25 litres) of water for a 50 kg bag. However, this is water for hydration and not total water. A total water content of about 60 to 80 litres may be ok, but it really depends the aggregate type and size. Trial mixes can be used to confirm. 2. Curing for a period at least 7 days. If it's just walking, that can happen after 24 hours. The concrete would be hard enough to support a man's weight without issues. 3. For the outdoor verandah, there will be a number of admixtures to improve the water-resistant properties of the concrete. Other options will be to use a tiled finish, giving the surface a suitable slope etc. Thanks for watching!
I'm not very good at math but with this presentation I felt like I'm a mathematician. It is very easy to follow. You are a natural born teacher. Thank you and keep it up :)
Thank you this is so helpful to me. I am not an engineer but i am trying to learn from you to build a small house for me. Thank you once again. God bless you.
lol, make another video for the lay man, tell them how many bags of cement, how many head pans of sand and gravel is needed to make a slab of dpc. That will make more sense to a lay man. Thanks
I find your videos very succinct yet deeply incisive and straightforward. How can I reach you please? I would have left my phone number here but I do not know if this comment section is public or not. Kindly reach out please. Thank you.
thank you for this video , if we have granite instead of gravel the density we change likewise the volume of granite , can you throw more light on this
Yes. Depending on the material density, the volume will be adjusted accordingly. This is because the mix design is based on the weight of the aggregates. For example, using granite instead of gravel (they're quite similar though) can give a different concrete strength even if the same mix ratio is used
Thanks for the presentation. A question. If Iam using a wheel barrow to measure my mix as in this calculation (1:2:4). Will I be right to say 1 bag of cement is to 2 wheel barrow of sand and 4 wheel barrow of aggregates?
what you can do in this situation is, pour the cement in the wheelbarrow and mark the level, that should be the level you will use to measure the rest of the materials.
Thanks. your explanation is excellent. But it could have been far much better if you had done it a little bit slow. As you know we are not at the same level of understanding so as to allow us who are slow to grasp the sense out of it
The 1.54 is mainly to cater for the voids in the aggregates ie the spaces between them. If for example, you have a cup and fill it with stones, you can still put some sand in that same cup without the cup overflowing. And even with the stones and sand "filling" the cup, you can still add some water, again without the cup overflowing. You get the idea?
This video is exactly what I need to know, but still don't, kindly assist, 22 meters, in length, 600 cm in width, and 10cm in height, footer for my block wall, M25 concrete recommended, 1: 2:2 ratio, I think, how many cement (50kg bags) how many wheels barrows sand, and stone?
The 1.54 is a factor that is used to allow for the voids in the aggregates. By the time the constituents are thoroughly mixed and compacted, all the void spaces in the gravel and sand will be filled up, leading to an increase of the dry materials.
In order to calculate the number of steel bars, one will need to have the structural drawings and use it to prepare a bar bending schedule (BBS). It is from that BBS that the number of reinforcements can be calculated
The price of concrete will depend on the price of the constituent materials (sand, chippings, water, cement) as well as the desired grade (C15, C20, C25 etc), cost of equipments (mixer, poker vibrator) and the cost of labour. You will agree that the rate will not be uniform across the country
However, using the slab in the video, a rate breakdown per cubic meter of concrete can be thus; 1. Cement: 6.3 bags x 8,000 = 50,400 2. Sand : 0.7 tons x 6,500 = 4,550 3. Gravel : 1.3 tons x 8,500 =10,400 4. Water: = 500 5. Equipment (mixer, etc) = 5,000 6. Labour = 10,000 7. Overhead and profit:@20%= 16,170 8. Total cost per m3: = 97,020.
Please can you do a recent video of a house plan of 1000,1200 to 1400sqft i.e 20by50 to 20by70 with ground floor,first floor and second floor containing 3 to 5BHK. #Civilworks the materials needed and walls to be used whether bricks or stones or cement blocks
I have a question on the density of sand and crushed stones, according to bs 648, the density of sand is in a range of (1602 plus or minus 160kg/m^3), is there any reason you used 1600kg/m^3 only?
When carrying out a mix design, you will need to establish the actual densities of the materials regardless of what the table of values state. I've once encountered gravel with a density of 1850 kg/M3.
The water content is based on a water: cement ratio of 0.5, ie about 25 litres for each bag. However, this volume is just the free water and not the total water. On site, the total water is between 30 and 40 litres per bag, depending on the workability required
Maybe so, but waste is a highly debatable component of the material estimate. Why should the client pay for "waste"? I think the cost of "waste" should be factored into production of concrete and not the material requirements. Great point, though.
A lot of people, actually. If you're interested in your house lasting long without carrying out repairs every year, that initial (additional) cost is well worth it
@@voiceofthunder7345 Depends on the material you're loading and whether you're heaping it or level in the barrow. A wheel barrow is about 60 - 65 litres (flat). More when heaped. So, when full of aggregates ie sand or gravel, it gives approximately 90kg. That means you will need about 11 wheel barrows to give you a ton
Please i want design a concrete mix of grade 30 that is M30 please i want your assistance. if possible i can contact you privately if you can give me your username please thanks.
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I love your presentation. Even a blind person could follow and understand what you've said and what exactly to do. Thanks
Glad you liked the video ☺️👍
Thank u sir, am an electrical engineer but this video has help me understand my civil knowledge. Thank you
You're welcome!
Please we need more video like this you are doing amazing job.
Thanks 👍
Firstly, your video is the best I have seen on TH-cam so far, Thank you for making it easy to follow and understand.
I have a question? How much water do I put into a mix for the concrete to be at its best?
Question 2 What would be a time period to allow to cure, or walk on it?
Question 3 My slab is a veranda and exposed to rain and the elements, is there an additive that I could put into the mix to waterproof the concrete?
Again you are great. thank you
@gordonpeirce5967 thanks for your kind words of appreciation. It's quite heartwarming.
1. How much water to use? Well, a good water:cement ratio is about 0.5 ie 25kg (25 litres) of water for a 50 kg bag. However, this is water for hydration and not total water. A total water content of about 60 to 80 litres may be ok, but it really depends the aggregate type and size. Trial mixes can be used to confirm.
2. Curing for a period at least 7 days. If it's just walking, that can happen after 24 hours. The concrete would be hard enough to support a man's weight without issues.
3. For the outdoor verandah, there will be a number of admixtures to improve the water-resistant properties of the concrete. Other options will be to use a tiled finish, giving the surface a suitable slope etc.
Thanks for watching!
I'm not very good at math but with this presentation I felt like I'm a mathematician. It is very easy to follow. You are a natural born teacher. Thank you and keep it up :)
🙏 Thanks. Glad you liked the video
Thank you this is so helpful to me. I am not an engineer but i am trying to learn from you to build a small house for me. Thank you once again. God bless you.
Thanks. I'm glad you liked the video and also appreciate the prayer. God bless you and yours
Oga, you need to develop this channel. The info is priceless.
Thanks 👍. I have other videos in the pipeline. Watch this space!
Fantastic video! Gave me the needed information in an unforgettable way. Kudos 👏
Glad you liked the video.
This is excellent I understood perfectly well
Glad you enjoyed the video! Please subscribe for more. Thanks
Perfect ur calculations where perfect
Thanks!
Thanks...top explanations👍
Glad you liked the video!
Very useful, thank you so much
Great Lesson
Glad you found it helpful
Your lecture is so great
Thanks a lot
Very simple to understand
Thanks
Very help full video thank you
Glad you found the video helpful
Thank you sir. You know your trade.🙏🙏🙏🙏
Thank you 👍
This was helpful. Thanks
Perfect in cacuation were perfect😮
Thanks!
Great work chief
lol, make another video for the lay man, tell them how many bags of cement, how many head pans of sand and gravel is needed to make a slab of dpc. That will make more sense to a lay man. Thanks
Hmmm...you have a point there. I'll include that in one of my next videos. 👍
We are awaiting which make sense @civilworks826
Excellent 💯
Good morning please make a lesson for how to measure and calculate area of plastering. Thank you.
I find your videos very succinct yet deeply incisive and straightforward. How can I reach you please? I would have left my phone number here but I do not know if this comment section is public or not. Kindly reach out please. Thank you.
Thanks. Glad you found the video helpful. You can reach me on +234 813 7870 705. Call/WhatsApp
This was very helpful thank you
Glad you found it helpful
Good presentation. Can u make presentations for other aspects of building construction like plastering, roofing etc
Thanks for the compliment. And for the suggestion, I'll look into it.
Your videos are great
Thanks
good presentation ese
You did great
Thanks!
thank you for this video , if we have granite instead of gravel the density we change likewise the volume of granite , can you throw more light on this
Yes. Depending on the material density, the volume will be adjusted accordingly. This is because the mix design is based on the weight of the aggregates. For example, using granite instead of gravel (they're quite similar though) can give a different concrete strength even if the same mix ratio is used
Thanks for the presentation. A question. If Iam using a wheel barrow to measure my mix as in this calculation (1:2:4). Will I be right to say 1 bag of cement is to 2 wheel barrow of sand and 4 wheel barrow of aggregates?
No. You would be using 1 barrow (not bag) of cement. The unit of measurement must be consistent
what you can do in this situation is, pour the cement in the wheelbarrow and mark the level, that should be the level you will use to measure the rest of the materials.
Exactly!
Very amazing video, pls can you do a video on structural steel design for a watch tower with a shelter house on top
I'll see what I can do. Thanks for watching!
Thanks for the video.. ❤️👍
How much cubic of concrete mix would I require for slab.. W 2.4m x L 5.8m x 0.1 m
Thanks. your explanation is excellent. But it could have been far much better if you had done it a little bit slow. As you know we are not at the same level of understanding so as to allow us who are slow to grasp the sense out of it
Thanks for your comments. I'll try and accommodate your concerns in my next video. 👍
I want more of your lecture
Thanks so much brother
You're welcome 👍
thank you
You're welcome
Please make the same video for feet calculation. Thanks
Its a good work, how do we calculator iron bars in the slab
I'll try and do a video on bar bending schedule at a later date. Thanks
So interesting
Thanks
Oh sorry but do I use this same formula to calculate Plastering of walls?
@@gordonpeirce5967 plaster uses a similar sand to cement ratio but often richer. Plaster typically uses a sand:cement ratio of 1:4 to 1:6
Wonderful 💯
Thanks
Thank you sir, i have one question, where did you get the 1.54? Please can you explain it furthermore.
Thank you
The 1.54 is mainly to cater for the voids in the aggregates ie the spaces between them. If for example, you have a cup and fill it with stones, you can still put some sand in that same cup without the cup overflowing. And even with the stones and sand "filling" the cup, you can still add some water, again without the cup overflowing. You get the idea?
@@civilworks826
Yes I got the idea.
Thank you
If we calculate in feets, different quantities coming... shall we calculate in feets or in meters
It doesn't matter which one, as long as you're consistent with the units, the result will be the same
How do they calculate the number sand and cement for wall construction
What number were u dividing with volume to get density?
Since Density=Mass/Volume; Volume is Mass/Density and the density of cement is 1440 kg/m3
This video is exactly what I need to know, but still don't, kindly assist, 22 meters, in length, 600 cm in width, and 10cm in height, footer for my block wall, M25 concrete recommended, 1: 2:2 ratio, I think, how many cement (50kg bags) how many wheels barrows sand, and stone?
Let me subscribe first ....Thanks buddy
Thanks. Really appreciate it.👍
Thanks
You're welcome
we need more
Ok. Is there any particular type you will like to see?
Where did you get that 1.54 from am stack from there
The 1.54 is a factor that is used to allow for the voids in the aggregates. By the time the constituents are thoroughly mixed and compacted, all the void spaces in the gravel and sand will be filled up, leading to an increase of the dry materials.
thank you can you dfo videos on rigid pavements in the Nigeria context most the videos on youtube are for asians
Glad you liked the video. I've actually thought of doing a video on rigid pavements. Soon
Please make a video on how to calculate number of steel bar and cement in casting 14 pillar and slab with a dimension of 10m by 10m
In order to calculate the number of steel bars, one will need to have the structural drawings and use it to prepare a bar bending schedule (BBS). It is from that BBS that the number of reinforcements can be calculated
However, a video of how to do that is in the pipeline. Thanks for reaching
How to calculate a supporting wall, of 1,5m height?
Sorry, I don't quite understand the question
How can you calculate for current concrete rate which can be used for quotation.
The price of concrete will depend on the price of the constituent materials (sand, chippings, water, cement) as well as the desired grade (C15, C20, C25 etc), cost of equipments (mixer, poker vibrator) and the cost of labour. You will agree that the rate will not be uniform across the country
However, using the slab in the video, a rate breakdown per cubic meter of concrete can be thus;
1. Cement: 6.3 bags x 8,000 = 50,400
2. Sand : 0.7 tons x 6,500 = 4,550
3. Gravel : 1.3 tons x 8,500 =10,400
4. Water: = 500
5. Equipment (mixer, etc) = 5,000
6. Labour = 10,000
7. Overhead and profit:@20%= 16,170
8. Total cost per m3: = 97,020.
Sir how can i calculate the volume of Mass concrete of LxBxH which is 79 length B39. 5 Height 0.5
Your question is not very clear. Get in touch via the number in the description box
Please can you do a recent video of a house plan of 1000,1200 to 1400sqft i.e 20by50 to 20by70 with ground floor,first floor and second floor containing 3 to 5BHK. #Civilworks the materials needed and walls to be used whether bricks or stones or cement blocks
Hmmm. That's quite an ask! Do you have a particular building plan? Or just any plan that fits your description?
It is said what you are holding in the hand, you don't need a mirror to see it
Thank so much for your clear explanation, but you are too fast. Can you take time in your calculations please sir?
Thanks. I don't think I'm actually that fast. However , you can adjust the playing speed of the video to your preference
I have a question on the density of sand and crushed stones, according to bs 648, the density of sand is in a range of (1602 plus or minus 160kg/m^3), is there any reason you used 1600kg/m^3 only?
Well, 1600 kg/M3 falls within the range doesn't it? For practical reasons, actually.
When carrying out a mix design, you will need to establish the actual densities of the materials regardless of what the table of values state. I've once encountered gravel with a density of 1850 kg/M3.
@@civilworks826 it actually does, thank you sir.
How much water was added to the 1:2:4 ratio?
The water content is based on a water: cement ratio of 0.5, ie about 25 litres for each bag. However, this volume is just the free water and not the total water. On site, the total water is between 30 and 40 litres per bag, depending on the workability required
Thank you very much sir for your interpretation and your calculations.
My question is how can someone come up with a design of main Hall.
Main hall? I don't quite understand the question
That'd be the reinforced concrete design
He's only quantifying in this video
@@angelaonwuka1987 👍
What is 1:2:4?
1 it is cement or sand or gravel?
2 it is cement or sand or gravel?
4 it is cement or sand or gravel?
It's the proportion of the constituents. Like 1 bucket of cement mixed with 2 buckets of sand and 4 buckets of gravel
❤❤❤
How many 10kg in 6.3 ton
Well, 6.3 tons is approximately 6300 kg so for 10kg, that will be 630
How come of 13.8
.
Watch to the end, the explanation is there
1.95 is that volume of cement ?
Yes
Actually 1.98 m3
@@civilworks826 thank you for the video it’s immensely helpful
@@SARA00151 You're welcome
What if we use 1m3=1000kg
To change volume of cement in m3 into kg??
That will not be correct. It is water that 1m3=1000 kg, Cement has 1m3 = 1440 kg
@@civilworks826 thank you
@@edutt14 You're welcome
You didn't consider waste in your calcution. With this you
can cause dispute between client and contractor. Regards
Maybe so, but waste is a highly debatable component of the material estimate. Why should the client pay for "waste"? I think the cost of "waste" should be factored into production of concrete and not the material requirements. Great point, though.
In this hard Nigeria who uses 1:2:4 mix ration
A lot of people, actually. If you're interested in your house lasting long without carrying out repairs every year, that initial (additional) cost is well worth it
My last question is how many wheel barrows makes 1 ton?
@@voiceofthunder7345 Depends on the material you're loading and whether you're heaping it or level in the barrow. A wheel barrow is about 60 - 65 litres (flat). More when heaped. So, when full of aggregates ie sand or gravel, it gives approximately 90kg. That means you will need about 11 wheel barrows to give you a ton
Thikness .15 or .25 which one
0.15m
you are too fast
Really? And there I was thinking that I was too slow!
How can someone contact u.. i need ur contact plz. Its very important
Thanks. Glad you found the video helpful. You can reach me on +234 813 7870 705. Call/WhatsApp
I need to join this group
Please i want design a concrete mix of grade 30 that is M30 please i want your assistance. if possible i can contact you privately if you can give me your username please thanks.
Glad you found the video helpful. You can reach me on +234 813 7870 705. Call/WhatsApp
thanks
thanks, very helpful 😊
You're welcome!