₦airaland Forum

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I can't argue about the strength of concrete based on fine aggregates type because I haven't done any test based on that but I notice that the water to cement ratio (w-c) vary considerably using any of these two aggregates.

I have done some test to estimate and observed the effect of water content on strength of concrete, which shows that water content is an impact factor on the outcome of strength of concrete.
Other factors are coarse aggregates sizes, curing type and duration.

A Low water content gives higher strength of concrete but low workability. The problem is to find a balance between strength and workability and that is why additives like water reducer and plasticizers come handing to reduce water content by also making the concrete workable.

Fine aggregates filled in spaces between coarse aggregates and also help the cement to reduce shrinkage of concrete but don't really contribute much to the strength of the concrete

Miscellaneous:
A column normally resists axial compressive force, & I know it is also possible for it to resist bending (called a "beam column" ). Now, to the engineers, how can we make a beam resist bending? Or better put, what are the applications of a "beam column" ?

Columns resist both axial comprehensive forces and moment induced due to its slenderness, designed on the bases of resisting lateral forces in a monolithic frame structures, moment induced due to eccentricity, arrangements in column and beam construction.

There are different cases where columns undergoes bending in addition to axial comprehensive forces. Bending as a result of moment.

slender columns are designed to resist additional moment induced by deflection at ultimate limit state

Columns in monolithic frames subjected to lateral forces are designed to resist moment due to lateral forces

Column in beam-and - column construction, in the cases of columns supporting asymmetrical arrangements of beams

mufutau55:
Very good progress.

Hajji M.

Thank you sir

Front view

ummeey:
Who is your favourite empire character and why? Mine is jamal. Like cookie too.

I like cookie... ..and nigga luscious

We are at the lintel level now

More block work updates

Upper floor block work

diordaves:
abdulwastecx lets get a clearer perspective of your structural analysis so that we can follow you:

The building started out as a two wing Bungalow and it's now a Duplex right?

If this is the case, how was the structural conversion and the delivery of the project. How was the foundation of the bungalow transformed or improved to spread the load of the duplex? It may be the case that a section of the building still bears the structural hallmark of the bungalow foundation and other sections of the foundation were re-enforced to accommodate the duplex. A classical case of non-coherent structural stability flow. If a section of the building is "all round chained" like you've observed and other congruential sections are not, don't you think there is the risk of differential settlement which may explain partly the vertical cracks?

And for the horizontal crack, you've talk about the roof; that the roof may be exerting pressure on a section of the building with load bearing walls not all round chained evidencing the crack, but the other congruential section is properly chained with no problem. So it's evident that the building is not spreading the roof load evenly.....again non-coherent structural stability flow?

I've seen this happen again and again in the trade and often here on Nairaland. We over re-enforce a section of our project by building columns here and there without the re-enforcement transmitting to other sections of the building to eventually evenly distribute any resulting load, so it stands to reason that if you exert pressure on such structure, a section will hold better than other sections leading to cracks or worse collapse.

Let us know your final outcome. Well done.

No the building didn't start as a Bungalow, it was actually built as a duplex.

n3xt:
What are the probable cause of the crack?

I'm suspecting soil movement beneath the foundation. Upward pressure if the wall buckles. And I won't leave out the age of the building in the investigation.

When it's rushed and not well compacted, it'll definitely settle and crack is inevitable especially when built on wetlands.


Brabus

More features of the cracks : most of the vertical cracks originated from the top of walls and progressing downward.

Horizontal cracks occurs on both face of the wall.

Honey two wall were affected and these walls have two things in common, lacks of under underlying beam or wall and both carries roof load closer to the outside of the house

n3xt:
What are the probable cause of the crack?

I'm suspecting soil movement beneath the foundation. Upward pressure if the wall buckles. And I won't leave out the age of the building in the investigation.

When it's rushed and not well compacted, it'll definitely settle and crack is inevitable especially when built on wetlands.


Brabus

I slept off yesterday... Let me give you more hints

1. These cracks were experienced only on the first floor wall

2. This wall is a load bearing wall (carrying a roof load closer to the edge of the building.

3. This wall has no head beam connected to adjacent columns or pillars to help distributes load to the building frame (load to columns which is passed down to ground floor columns and subsequently to the foundation footings).

4. The building was a semi detached of two flats, these cracks were experienced in one of the balcony, there was am identical balcony in the other units without these cracks. So, we have to check the difference between method of construction of unit A to unit B. Unit A balcony wall rest on a slab beam and wall beneath and experienced no Cracks
Unit B balcony rest on a slab without beam and wall beneath (space below is a living room) and experienced the cracks highlighted above.

Structural cracks on a residential building.

This is a small investigation carried out by our team on courses and possible solutions to structural cracks on a newly completed building.

Introduction, we visited this beautifully finished five bedroom duplex to investigate the occurrence of cracks on some wall portions of the finished building.

The aim of this investigation was to determine the courses of the occurrence of both vertical and horizontal cracks on a new completed building.
To also prefer an economic, non detrimental to structural integrity and aesthetics of the building.

Note : permission has been taken from the building owner to publish the result of the report and to also upload pictures of the building on the conditions that beam of owner, location of project remain hornamous.

EgunMogaji:
This was delivered as sharp sand.

Is it okay or should I use it as fill dirt? The color is throwing me off.

The clay content of the sand is way too much, I will suggest you use it as a filling sir.

Miscellaneous:
Another analysis was carried out, many people use granite dust in their construction of houses and they always argue that it is very good but in my lab tests, I observed that the granite dust seems very hard to bond with the cement & coarse aggrega8 and when I tested the cube strength, it was far below the required value for a 7-day period. Now, why is granite dust still preferred as a fine aggregate even, when it ought to be rejected by all sane human ?

Can you publish the summary of your report here for all to see, so that we can all learn from it

AZUH:
@anikkyshaya ? Female ? What are you doing here ? No wonder everybody is busy welcoming her ? Nigerians !!!

Oga what is your problem with '' female'', she is entitled to all the information she can get to do her project. we are welcoming her because we love varieties here

anikkyshaya:
Am not d one ooo!!!!

Big madam, welcome to the house of structures and new ideas.... .

mavverick:
House

Which should be done first.

Electrical fittings
OR
Painting internal & external.

Electrical fittings: Electrician is telling me that nohow, there will be stains on the wall after they are done with the fittings and that painter can come later to do touchup.

It got me thinking, if they do the fittings first, would it not be stained by the painting ?

Any comments welcome.

Fittings should come first before painting... Your electrical fittings can be covered with masking tape or other materials during painting

skimanski:
Its possible what was Designed was Different from what was Build. And its also possible he gave the project to someone with a Relationship instead of a proper Professional.

That house no just try at all. Reminds me of Linda Ikeji's House. very poor Architecture for such an amount.

I watch the video where he alluded that though, the house was designed by a young architect but he tweak the house to his taste,. He continued by saying that all the interior are his ideas...

I kind of like the concept of the house but execution and interiors were terribly odd

NaijaFutbol:
Awesome work on the redesign!


Some questions though:
1. why the rods on the floor DPC for a bungalow.
2. I can see you will use precast parapet roofing. Shouldn't you have had rod pillars at all corners and at some spacing say every 4 meters.

Let me call on some other experts. I need to learn.

CC: spyder880, abdulwastecx

NF

This a wonderful project by my very good friend olabamijie... another wonderful product of fut Minna.
Coming to your question, the rod for the dpc is to to make the building better, this reduce any possibility of settlement of the dpc.

The building look solid enough with those corner pillars and it will be able to carry the precast provided their a well reinforced head beam... .

Chukazu:
but this is rather too high, more like a masquerade... I mean do you plan to rent the space in-between the roof to a tenant?

do we also consider maintenance, how can someone climb this is there is leakage?

The hight of the house is moderate. The hight Is a function of how wide and the angle you use. For this building the slope is around 30%, which is very good for easily flow of water and ease of repair

,

Mrjo:
to achieve 45 in rafters the hight of king post will be the measurement of the width divid by 2 bt to get that in corner hip 3 quater of the width.

Sir, check know this simple sketch below out

Mrjo:
45 degree should hav been for rafters nt ridge and V. gutter, though the work itself didnt show that, well, i will like to work with u.

You are wrong sir, 45degree is for the ridge or Valley.
The angle of the rafter is govern by the high of the roof. Hope this sketch below help

nwaanambra1:
you must be very good in what u do. superbly clean roofing!


oya wey those Nairalanders that always ask "who all those maths wey them teach for school epp!" come and see the people that it epped!


bros! this project na for anambra shee? even if its not anambra am sure its in the east!

Those mathematics and all those things we learned in school are very important, you just have to open your mind to them, learn them well and try as much as possible to apply them.

The roof Construction cost less because there was no trial by error. The construction was extremely fast because I have a concise drawing made with all dimensions.... In fact, every thing came out well because I always put in more time in the office to produce error free sketches for any job we want to do.

Experience is also a very important factor, I was a carpenter before (family business) we all learn how to do wood work from very early age

nwaanambra1:
you must be very good in what u do. superbly clean roofing!


oya wey those Nairalanders that always ask "who all those maths wey them teach for school epp!" come and see the people that it epped!


bros! this project na for anambra shee? even if its not anambra am sure its in the east!

My oga na for anambra o. You know anambra is a very beautiful place na. It is in akpom village very close to onitsha.

EgunMogaji:
Oga Abdul, this your finish guys, are they freelancers or are they staff that work under your supervision?

www.nairaland.com/attachments/3548017_3_jpeg182845aceb39c9e413e28fd549058cf8

They work under me but I can lend you sir, when you need them. They only do plastering work for me, I have other set that specializes in block laying.

Updates of materials will follow soon.
We start curing this morning

More updates this morning

More updates

Updates of first floor slab and beam casting work.

We have two concrete mixer on ground

ganiyu26:
Informative!

Thanks... more to come f