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constraction details

Tue Jul 17, 2012Total posts : 4
ranvir kumar singh
ranvir kumar singh
Join date: May 2012
Topic: constraction details

i have two yrs old home. there is some crack in wall and pop. and i have notice hair like crack in celling  . this crack looking like a net.what is reason of crack and how to repair carck. i have attached some picture.
Attachments: Photo0511.jpg on Tue Jul 17, 2012, 
Photo0512.jpg on Tue Jul 17, 2012, 
Photo0513.jpg on Tue Jul 17, 2012, 
Photo0514.jpg on Tue Jul 17, 2012,&n
Wed Jul 18, 2012Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008

Dear singh

           There are many reason of cracks in the building, main reasons are due to drying and shirankage, chemecal reaction and foundation movement and foundation settlement etc.

In your building Iam in opinion that there is case of foundation settlement and I think you have not made plinth protection. Some water percolate through siol in foundation and there by settlement in the foundation.As per your ceiling cracks in slab, which might  be due to settlement, by using fine material in RCC, or sand with execive silt is used.

Construction plinth protection if not made, Ensure that there is no any leakage in the sewer or water pipe line or frome open drain. Repair the cracks as given in the artices of HOW TO REPAIR CRACKS. LINK GIVEN BELOW

http://www.gharexpert.com/articles/Cracks-1468/How-To-Repair-Cracks_0.aspx

http://www.gharexpert.com/articles/Cracks-1468/How-To-Repair-Cracks_0.aspx

http://www.gharexpert.com/articles/Cracks-718/Which-Various-Reasons-Cracks-in-Buildings-_0.aspx

 
Wed Jul 18, 2012Post  #2
ranvir kumar singh
ranvir kumar singh

Join date: May 2012
thaks guapta sir.
 
Wed Jul 18, 2012Post  #3
ranvir kumar singh
ranvir kumar singh

Join date: May 2012
Post subject: construction methodology

After study u r comments i am sure that crack in wall is due to foundation settlement and in ceiling is due to excessive silt or fine sand.
i would like to know about following.
1 How to reduce
drying and shrinkage effect.
2 How many day curing require in wall and ceiling slab.
3 how many day shuttering require for ceiling support.
4 how to construct
Construction plinth protection.
 
Thu Jul 19, 2012Post  #4
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008

Dear Singh

       The drying and shrinkage effect can be minimise to use required quantity of cement. Some time mason add extra cement for the reson to enhance the strength but after some limit it will not benifit the structure and excessive cement gives greater drying and shrinkage. If you use more fine material than there is more drying and shirankage.Some time mason add more water in the mix for easy and to save time and labor is one of the main cause of cracking specially in floor. Improper curing is also one of the cause.

Curing for wall masonary should be done at least for 7 days. For Rcc Roof the theoritical curing is for28 days but practically do curing at least for10 days i.e. water should stands on the slab like POND.

At least 7 days shuttering should be kept under horizontal surface in case of slab.

In plinth protection, construct support wall/ toe wall. Than compact the earth with rammer and lay lean cement conc and compact again. Then lay floor with c.conc. 1;2;4 or any other floor finishing as per your choice.Care hould be taken that there is proper slope from building to out side.

 

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