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Questions about Concrete in House Construction

Wills · 147 · 23448

Wills

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Hi everyone! I'm currently building our house and I have a question, what kind of concrete slab should I use, ready-mix or site mix?

I'll be using:

T-Joist from jackbilt (6,000 psi)
Hollow Blocks on ground floor is load-bearing from jackbilt (1,000 psi)
Hollow Blocks on second and third floor is also load-bearing from jackbilt (700 psi)

The whole structural system is engineered using the said specs.

Reason for my query is because I'm having difficulty in deciding whether to use ready-mix concrete or on-site mix. Ready-mix is more expensive but more consistent and accurate compared to the on-site mix but since I'm using T-Joist which has good compressive strength(6k psi) I don't feel the need of using ready-mix anymore because T-Joist acting as a "BIGA" is well spread out, it's like the slab of second floor is well supported using T-Joist.

Please help me guys! :help:

Thanks!
« Last Edit: Oct 29, 2017, 12:32 PM by FutureGizmo »


wilch23

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Reply #1 on: May 04, 2017, 08:18 PM
If your budget allows, Ready mix pa rin for consistency.
Normally you may test a random sample to check if it complies with your specs (psi rating).
You may save a bit on labor also.
Lastly, you will save some time. a few hours lang for each floor.


Wills

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Reply #2 on: May 04, 2017, 08:58 PM
If your budget allows, Ready mix pa rin for consistency.
Normally you may test a random sample to check if it complies with your specs (psi rating).
You may save a bit on labor also.
Lastly, you will save some time. a few hours lang for each floor.

Thanks.

I forgot to mention, I'm using sharp sand (Blue Sand as they call it here in PH) for my slab if ever I will opt for on-site mix that is why I'm kind of leaning towards the on-site mix but yeah you're right uniformity in ready-mix cannot match by on-site mix.


Thomas

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Reply #3 on: May 05, 2017, 12:15 AM
Hi everyone! I'm currently building our house and I have a question, what kind of concrete slab should I use, ready-mix or site mix?

Don't use premixed if you aren't sure of the mix, because normaly they mix in to litle cement to "save money" !!!
It's easier FOR THEM to use such because such FLOAT better, but it become much WEAKER.
Hollow Blocks on ground floor is load-bearing from jackbilt (1,000 psi)
Hollow Blocks on second and third floor is also load-bearing from jackbilt (700 psi)
I don't know what that mean concerning CRACK risk.
Have you made a "drop test"?
If you drop a good one from chest hight, they will fall in max TWO pieces
while the common ones CRUMBLE...

There are a FEW who make good ones though. I know only of one (Toledo, Cebu).

Some foreigners have even bought an used hollow block maker to be sure of the mix, just to be used to the OWN house.
Ready-mix is more expensive but more consistent and accurate compared to the on-site mix 
Well. You can do as I did and buy an used cement mixer. Just messure good enough and mix long enough time.  Or use one for rent, if there are any such in your neighbourhood.


radio_head

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Reply #4 on: May 05, 2017, 01:16 PM
Very helpful thread. Anyone who knows kung anong materials ang ginagamit ng mga developer sa structures ng condominium? Gusto ko kase mag-canvass kung magkano magagastos ko for building a apartment? And gusto ko kasing-tibay siya ng condominium.


Wills

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Reply #5 on: May 06, 2017, 09:06 AM
^ Yes this will be a helpful thread sa mga gustong magpatayo ng bahay na quality pero hindi kamahalan.

I'm building my house with contract on labor only the rest is on me supervision, buying of materials and also research on alternative methods that will reduce the total cost without sacrificing the quality.

Right now I'm still in the structural process but while at it I'm doing my research on the finishing process of my house.

My house has a floor area of 400 sqm, we're estimating the house to finish at around 5.5M to 6M, I didn't go for the contractor route because they will build my house at a cost of 9.8 million so I decided to do it myself.

For anyone here who is afraid to build their dream house by themselves what I can say is don't be afraid, I for one has no knowledge at all when it comes to construction but here I am now building my dream house!

If you guys want to know how to do it just ask! I might be of help
« Last Edit: May 06, 2017, 09:08 AM by Wills »


wilch23

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Reply #6 on: May 06, 2017, 10:20 AM
Follow up lang, we used pre-mixed concrete for my last project in the PHILIPPINES.
Baka sa Sweden meron nagdadaya sa mix?

Anyway, we required compression testing for each batch. The concrete company will give you some bollards taken from each batch, then an independent company will do the compression test on 1 or 2 pieces. Pag-fresh pa curing, it won't be at full strength pero meron extrapolation of final strength namin based on science of concrete.
Based on my experience, the actual strength usually exceeds the required specs.

Since you're using T joists, then maybe the cost will have to be given serious consideration.


Wills

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Reply #7 on: May 06, 2017, 11:13 AM
Thank you Wilch, yes I'm considering the pre-mixed concrete na since hindi naman masyadong malayo ang cost sa site batch mix dahil residential lang naman.

Regarding T Joist, ang cost is a lot cheaper compare to conventional were you need to buy materials for formworks. The cost of using t joist is around 928 per sqm finished slab na iyon and using site batch mix.


Wills

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Reply #8 on: May 06, 2017, 01:53 PM
UPDATE:

You can rent a concrete mixer for only 150 per day for the whole four months. It's cheap!


tenrai

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Reply #9 on: May 06, 2017, 03:44 PM
Mas mura din po ba un t joist kesa sa steel decking?


Wills

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Reply #10 on: May 06, 2017, 04:55 PM
Yes because you don't need to buy materials for formworks e.g. lumbers, nails and steel deck.

Also the slab thickness will lessen by 2 inches vs 4 inches thick so the total concrete that you need will cut in to half.

And the steel that you are going to use in your slab will be the 6mm steel mesh wire instead of 10mm deformed bars, mesh wire is a lot cheaper. Why steel mesh wire? because your T Joist is rated at 6,000 psi which has enough strength it doesn't need larger diameter of steel.

You only need to use two 6mm mesh wires in roof decks and toilets just to make sure there will be no cracks in the future while in conventional slab you will use two layer of 10mm deformed bars.

Another plus factor for using T-Joist is the weight ratio of your slab, slab using t-joist is much lighter than the conventional.

Dead loads of the typical slab is huge compared to slab with t-joist, making your slab light is very important as the concentration of the strength of your slab will focus more on the loads that it will carry and less on its own weight.
« Last Edit: May 06, 2017, 06:59 PM by Wills »


wilch23

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Reply #11 on: May 06, 2017, 05:58 PM
Sir, rebars reinforced din ba ang T Joist?


Wills

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Reply #12 on: May 06, 2017, 07:00 PM
Sir, rebars reinforced din ba ang T Joist?

It has prestressed steel
« Last Edit: May 06, 2017, 07:07 PM by Wills »


tenrai

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Reply #13 on: May 06, 2017, 08:10 PM
Ano po ung ilalagay nyo sa gitna ng dalawang t joist? Alam ko sa pars builders, solid block ang nakalagay sa gitna ng dalawang t beams nila.


Wills

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Reply #14 on: May 06, 2017, 09:20 PM
In Jackbilt, they have a removable steel form and wood cleats that are for rent.

Wood cleats will serve as the lock and support of the steel form.

The rent of removable steel form and wood cleats are fully refundable when you return them.


The question is who's the cheapest of the two? Jackbilt or pars builders?


I'll search on that this coming monday.
« Last Edit: May 06, 2017, 09:54 PM by Wills »


 


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