www.sefindia.org

[rahulrai711]

HiThe issue is ok. Its  easily repairable. Following steps are required


1) Shot patch
2) Pmm
3) Anti rust agent 
4) Carbon fibres wrapping  ( depending on beam condition , the pics of which is not attached ) 
And u will be good to go for another decade or so .
Nothing to worry.


P.S. - such conditions is normal in buildings of Mumbai and have repaired quite a few using combination of steps enumerated above.
Regards 
Rahul Rai






On Sun, May 15, 2022 at 9:43 AM Arpit Parikh <forum@sefindia.org (forum@sefindia.org)> wrote:

[rahulrai711]

And yes , no requirement of emptying the floor above  , just this that till mortar sets , there is no vibration on the immediate above floor ,mostly  residents agree on this and repairs are carried smoothly.


Regards
Rahul Rai


On Wed, May 18, 2022 at 11:51 AM Rahul Rai <rahulrai711@gmail.com (rahulrai711@gmail.com)> wrote:

[vikram.jeet]

But as a first aid , pl provide urgently a steel beam of good depth and heavy ,  to reduce the span to half.


[quote="mugil_sam"]Hi,
I have seen the images, kindly engage a structural engineer from your end to inspect your flat, provide the report. you share the report with the upper flat owner and the association. to take appropriate action.. it is of high risk for both yourself and the upperfloor.


We have lots of repair procedures like those discussed by the experts in the forum. The structural engineer will test the slab, beam column and other areas using the NDT test to provide a complete report.


in the images i can see some more cracks so the falling concrete will continue, hence avoid using this flat and move to a safe place.

Regards
S.Mugilon

[e80707]

You have clearly stated that "the upper flat resident does not allow to do the work". It signifies a non-urgent situation. Generally, one can accept the 40 years of life span if a two-way slab. In addition, sidewalls have no shear crack, which means the loading scenarios are in control. Minor patching and grouting is required. Check the floor of the above residence and see whether it is okay.

THanks you

[csr_building_repair]

For structural audit of old residential and commercial buildings, connect us at https://www.buildingrepair.in.

Pl drop your requirement and we shall be honoured to assist you in possible ways.

Thank you.

Rajesh B
9323547766

[Seshadri]

Hi All,My proposal to arrest damage is below. Before that, why I have a different take on a few points made by esteemed engineers. 
1. The spalling is due to corrosion.
2. Spalling occurs only in the cover, and has happened at a few spots; so that is unlikely to be a structural  issue yet considering ceiling slab is not expected to take building load.
3. Clearly, concrete is of poor quality and very porous.
4. Sacrificial anodic protection has a short life - depends on the quality of concrete and the thickness of the member. From the spall pix and considering it is 100-150mm thick slab, anodes are likely to dissolve in just  2-3 years; and to be effective even for that period, should be installed at regular intervals across the slab necessitating opening of covercrete and repairs. 
5.Cathodic protection is right if the problem were due to continuous and unstoppable chloride ingress;  sea breeze from the creek at Nerul can bring  chlorides, but ingress cannot be continuous nor unstoppable - a good protective coating can stop. 
My Diagnosis:
Spalling seems to have occured due to water ingress from upper floor wet areas. If additional signs of fungus on interiors, or of paint blistering / peeling is seen, the suspicion is confirmed.
If so, the upper floor bathrooms and wet areas etc should be made watertight; all embedded water pipes must be ensured watertight.
If there are no confirmatory signs of water from the floor above, the most likely cause of corrosion is  contamination in concrete. At least in the concrete used for the affected slabs, either beach sand was used or the water was chloride rich (say brought from nearby backwaters?), etc. A piece of spalled concrete can be analysed for chloride content - if more than 0.15% by wt of concrete, corrective actions must be taken.
The only way to stop issues with  chloride contaminated concrete is to stop 100%  moisture and oxygen ingress  into the concrete, after repairing the spalls. There are excellent solutions that are affordable; other methods such as Electrostatic chloride extraction are too expensive and impracticable in an occupied flat.
Hope the above helps.




On Tue, May 17, 2022, 9:47 PM nitbehl77 <forum@sefindia.org (forum@sefindia.org)> wrote:

[Rahul Ganguli29]

[Kunal Tank]

Hi Pankaj,

Kunal this side, I am based in Delhi NCR and handling those kinds of Jobs. Please revert me at kunaltonk@gmail.com (kunaltonk@gmail.com) or call me at 9997144468 for further discussion.


Best,
Kunal


On Sun, 15 May 2022 at 09:24, Pankaj Bhardwaj <forum@sefindia.org (forum@sefindia.org)> wrote:

[quote]            Hi 

I read your email and really feeling bad with what you are facing and therefore thought to reply.
I am bridge Engineer with more than 10 years of experience. I have few points on which you should think about.


1) your slab is cracked section, maybe because of poor construction and  less steel, no matter how much repair you do you cant make the benefit of uncracked section. That is the moment of inertia has reduced considerably.
2) you can see the steel, if possible get your steel spacing, steel dia and cover of concrete checked from the agency using as built design drawings.
3) you can not break the floor, the guy living at top will never allow for that, until and unless you move with strong legal support.
4) The best solution for this is GFRP/CFRP retrofitting. That will inrease the strength of slab equal to or even more than uncracked section. You need to consult structural engineers who do cfrp retrofitting.


Lets see what others think about this.
 
Thanks 




On Sun, 15 May 2022, 12:02 am ssen, forum@sefindia.org (forum@sefindia.org))> wrote:

      --auto removed--

Posted via Email

[mjnasar]

Dear sir

the best solution for your condition is - as answered bt vikram jeet sir
please go ahead with the works suggested by vikram jeet sir ( until society do some thing

God willing it will be Ok

best regards

[ssen]

Hello Sirs,

Thank you so much for so many replies from learned persons like you. I go through all the responses.

I am too much occupied fighting with my Society's illogical and unjustified attitude towards my flat, by not allowing us to continue with the work as well as not doing it by themselves too, for the reasons best known to them.

Let me get some clearances from the society, I will get back to you. If anyone can please help me how to deal with or what actions should I take for the inactions of the society, that would be great.

Best regards...