₦airaland Forum

FEGEITOK:
The standard practice is that you do 1 part cement to 3 parts coarse aggregate.

What is supposed to be varied is the sand of which you are using 1.5 parts.

So as far as I am concerned your mix ratio is fine.

I use 1 part cement to 2 parts sand to 3 parts course aggregate though.

As for your question on using 16mm for the columns and 12mm for the upper beams, here are a collection of links for you to review.

It seems to have received the seal of approval from maestros on this thread

Thanks for your time engineer

sonnie10:
If they are of equal length, that means each is about 3.2feet in height.

Sure u r right here

sonnie10:
Is the total length of the 16 pillars 50 feet or is this the length of just one pillar?

How could the length of a pillars b 50feets? Which kind wahala b this! Pillars is 3meters each or 10feet each highest. The building length is 50feets while the breath is 30feets. Pillars is usually 9" inches width each. I don't understand ur question oo

sonnie10:
Is the total length of the 16 pillars 50 feet or is this the length of just one pillar?

Total numbers of the pillars is 16 numbers .
Length 50feet breath 25feet

sonnie10:
Are the units of these dimensions accurate?

I don't understand

Good day engineers in the house, pls which of these is the best TMT IRON ROD currently in used today and tested ok.
PSL, TIGER, HITECH, LCI including their prices.
I want to know the best among them before the purchase.

DMTtechnologies:
* What are the sizes of the "pillars" (LxBXW)
* What's your Mix ratio

The entire pillars is 16 Nos
My mixing ratio is 1:1.5:3 u can as well recommend the best mixing ratio for me also. Length 50feets: breath 25feets: width 9inch size of a 9inches blocks which was used for the entire wall.

Also is it ok to use 16mm for the columns and 12mm for the upper beams for a storey building

Good day engineer in the house, pls like how many tons of sharp sand & 3/4 granite including cement can cast. 16 pillars successfully including the lintel

destiny10:
Relocation sales-6pcs of curtains available at give away price 5k only.

Only the curtains no rails pls

Location nd contact pls

Stevo30:
Please I got this quote for some column work, is it fair

*Column Casting*
27 pcs (230 x 450 and 230 x 230)

33 bags of Cement = N141,900
Sand = N120,000
Granite = N180,000

1 ton 16mm rod (TMT) = N560,000
15 length 10mm = N57,000
Binding Wire = 16,000

Column formwork rental = N150,000
(Bamboo, Wood, column shutter, nail and workmanship)

Iron bending = 50,000
Casting = 30,000


*N1,324,900*

I think d price is fair for 27 columns, but d cement is too small oo. It should be 3bags for 2 columns, which should be like 40bags. what about beams?

kalu61:
Nawa oo.

No bi Coren exam l de write
The dryness of the sand and granite affects mixture. However, the slurry, the better.

U try, thanks

kalu61:
Soft and sand inclusion. Na theory you de talk . I don't use them. Only sharp sand.

That mixture up there is my standard.
Some do 1:5:5

Ok thanks, what about water ratio to the above mixing 1:5:5? How many litres of water is adequate for the above?

kalu61:
Will car park on it?

1:4:4
1 bag of cement to 8 sand and 8 granite of headpan. If you want to be economical then make it 9 sand and 9 granite.
12mm is fine.

Is it only sharp sand? Wot about soft sand inclusion?

Also what is the best mixing ratio for lintel and pillars for a storey building

anuoreangel:
Timberland
07013050882

Nationwide delivery available

How much and what are the available sizes

Gigaset:
This method are common in most African countries I don't know why we don't use this method here in Nigeria,in Kenya they use this method is called Beam & Blocks think of how much someone can save on formwork,steel bars, bamboos etc...using this method

Am speechless oo, wow! Well we learn every day, thanks for the insight engineer

KolaShangOne:
If you really want to do large quantities, come to Ogun state.. There's CDK at Sagamu, Goodwill and Royal (I think) around Atan.. etc

If u want CDK TILES I can assist u from the source.

arcahmad:
Advantages of hollow blocks slab.

- Its more economical.
Hollow blocks is more cheaper to execute than normal RC slab. It saves more than 40% of total cost of both labour and materials to be used in construction.

for example. If you need 200pcs y12mm bars for decking in normal slab, you will need 120-150pcs of y12mm bars for hollow blocks slab. Same as cement and gravels.

- Low self-weight
Because of the hollow blocks been used, it reduces the quantity of concrete to be used which increases the dead load (self weight) of the building.

- More stable.
Hollow blocks slabs uses mostly beams which intersects with one another strategically, making it more stable.

Contact me for your building supervision or architectural drawings. My services are but not limited to;

- Decking contract (both carpentry and casting)
- Plaster labour contract
- Blockwork labour contract
- Tiling and interlocks. etc

contact me on 07069672461
Thanks

Am seeing this for the first time. U mean this is a decking of a building? What are the sizes of those steel bars used? Nawaaaa ooo!

abdulwastecx:
I think 1 bucket is 25liters.

It's one bucket of water to one bag of cement.
Let me use this simple calculation to buttress the point.
assuming that you want to use a Water/cement ratio of 0.5. Hence for 50kg of cement, you will need 25kg of water.
Since the density of water is 1000kg/m3, and mass = density x volume.
since one bucket is 25litres = 25/1000 m3
mass = 25/1000 x 1000 = 25kg.
hence 25litres of water is 25kg.

Also to the final question that you asked,
1:2.5:3.5 mean
for every bag of cement ( which is 2 head-pan (flat)
5 head-pan of sand ( flat the surface, don't hip it)
7 head-pan of gravel (flat the surface don't hip it)

Thanks for the swift response, but d above analysis didn't spell out 1:2:5:3:5 kindly spell out what each digit stands for from the above analysis cos I know it's usually times 2 of the ratio, reason being that the concrete mixer usually mixed a bag of cement in two portion . However, are u saying there is no room for soft sand in ur formulation? What if it's column(pillars)?

abdulwastecx:
But 1:2:4 will not even give you the minimum required strength for most reinforced concrete applications.

If most reinforced concrete work. I use 1:2.5:3.5 which will give characteristics of concrete compressive strength of 25N/mm2 after 28days.

Also, the water-to-cement ratio is so important. W/C of 0.5 which will translate into 1 bucket for one bag mix should be the way to go.

For example, if Mr. A uses a mix of 1:1.5:3 with too much water, 1.5buckets, and Mr. B uses a mix of 1:2.5:3.5 mixed with 1 bucket, the strength achieved by Mr. B will be better than that of Mr. A with all things equal.

In summary, quality control is as important as the volume of cement used in concrete production. Also, I experiment with mixes and carry out tests from time to time.

Good day engineer, pls if am not wrong ur 1:2:5:3:5 means, 1 bucket of water, 1bag of cement, 10 headpan of sharp sand, 6 headpan of soft sand, 10 headpan of Granite
Pls correct me if am wrong!
Also how many litres of water is ur 1 bucket equivalent?

Aforxzy:
The position of columns are determined by the structural engineer from the architectural drawings. They are placed in such a way that they do not obstruct circulation while ensuring that the stability and design of the structure is not compromised.

In this picture, we can not but assume that this column is placed outside the wall because that's where the structural engineer deem it should be from the drawing available to him.

Such columns are referred to as unbraced..

Thanks for the insight chief engineer!

Good evening engineers in the house. Pls what type of pillar is this and why are they outside and not inside as usual

ananne:
Sharp Sand= 36,000 x 3 trips= 108,000

Gum Sand= 35,000 x 1= 35,000

Cement= 3900 x 100 bags = 390,000
Transport and job= 20,000

Water supply= 30,000

Workmanship for Plastering is 400,000
( Dressing of doors and windows is not included)

Total amount is 983,000


This is the quotation I fit for the plastering of a five bedroom bungalow in the south east

What do you think guys?

Sharp sand or soft sand for plastering??

ollykay619:
Hello house, Please i got this quotation from iron bender. Is the workmanship charges okay? The materials are on ground

The city is ibadan

Well done chief, is the building a storey building or just a bungalow? How many pillars in total are we talking about here? pls update us about the carpenter charges, bricklayer charges, and the total amount to complete the lintel and beam. I av similar project at hand to complete please.

ollykay619:
Hello house, Please i got this quotation from iron bender. Is the workmanship charges okay? The materials are on ground

The city is ibadan

Well done chief, is the building a storey building or just a bungalow? pls update us about the carpenter charges, bricklayer charges, and the total amount to complete the lintel and beam. I am similar project at hand to complete please.

Aforxzy:
Yes, it is good and better you continue the columns with 16mm bars.

Please don't ignore the structural drawings unless the building drawings has been completely altered.

Thanks engineer, I will go back to the structural drawing as advice

Aforxzy:
How many floors does your building has?

For your ground to first floor columns ( pillars) please use 16mm bars.

Beam reinforcements are determined by the load it will be subjected to and the length/span of the beam. This will be calculated/ designed by the structural engineer. So I can't tell you the rebars to use on your beams.


However for the slab, Y12mm is very appropriate but the spacing depends on the load and span..

Do you have a structural drawing for your building?

It's a storey building on 30feets W by 60feets L
Hmm, what if 12mm is already in the ground foundation of like 3 coaches foundation, is it possible to continue the remaining long pillars with 16mm?

structural design is at the back of the building plan but I think it's bn ignored because am not on ground physically but everybody checking it said the buildings ok so far but I still want to b on more saver side

Aforxzy:
How many floors does your building has?

For your ground to first floor columns ( pillars) please use 16mm bars.

Beam reinforcements are determined by the load it will be subjected to and the length/span of the beam. This will be calculated/ designed by the structural engineer. So I can't tell you the rebars to use on your beams.


However for the slab, Y12mm is very appropriate but the spacing depends on the load and span..

Do you have a structural drawing for your building?

It's a storey building on 30feets W by 60feets L

Aforxzy:
For this reinforced concrete roof slab and beams, we used a total of about one ton of steel ( Y10&Y12 for the slab and beams, while Y16m bars for the beams).

Thanks for the Swift respond!
Is it possible to use 12mm for the pillars and also the beams including the slabs(decking)?

16mm for all the columns(pillars) or beams?

Aforxzy:
Form work and reinforcements for the gate/power house roof slab

Pls like how many tons of steel for this decking?

CDG1:
Payment before delivery sir

Payment b4 delivery abi wetin u call am? Ok isoright!

Of course yes, thanks for the insight

olukaygold:
It'd make your Project more solid if you can afford it.

olukaygold:
I've to reduced the measurements because There's already deposited stone Sand in the Gravel unlike Granites that is solely grained rock.

Sure, now I understand.