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Is this type of cracking in columns accepted?

<p>dear all,</p> <p> </p> <p>today's morning I was taking a look at new building in its first stage of construction. I found out a crack covering all sides of the column as shown in the pictures bellow.</p> <p> </p> <p>please</p> <p> </p> <p>1- is this type of cracking accepted?</p> <p>1- what are the causes of such cracking?  </p> <p> </p> <p> </p> <p> </p> <p><img src="http://im82.gulfup.com/CXJ6Ip.jpg" alt="" /></p> <p><img src="http://im82.gulfup.com/8vFQCh.jpg" alt="" /></p>

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Question ajoutée par Ahmed Al-shaibani , Senior Civil Engineer , STST
Date de publication: 2014/10/26
Muhammad Khalil
par Muhammad Khalil , Chief Engineer (Civil) , Water and Sanitation Services Mardan

The type of cracking is not acceptable and the solution is to dismantle one side of the column so that main bars are to be seen and try to put one another row of main bars with the column and bind with the older and refill from concrete 

FAZAL BASHA SHAIK
par FAZAL BASHA SHAIK , Laboratory Manager , Bureau Veritas

Hi,

Such type of cracks are not accepted. Before loading the column started cracking.

I am having a doubt that by seeing the pictures it is looking like the column concrete is not rich in strength, the quality of concrete is too poor and compaction is not up to mark.

And one more clear and Even horizontal crack was found due to poor shuttering workmanship.

The Shuttering is also not good.

Thanks

Fazal

 

 

LABIB KOOLI
par LABIB KOOLI , Director of the Sectoral Center for Training in Hotel Technologies at Southern Hammamet , Tunisian Vocational Training Agency (ATFP)

Not at all accepted !

Most of the present professionals are agree that the poor concrete is the basic cause of this non conformity.

 

فؤاد أحمد حسين
par فؤاد أحمد حسين , مدير , حكومي

Thank you my dear friend for this invitation ,,, we have to know more information from the site about the column concrete casting works my be we have problems  during this works cause to stoped concreting or daily it to the time which effect to the concrete mix and my be also they add more water or cement and water to the   mix thinking that they will get more control  to the workability of concrete in spit of  an other mestek by using more vibration  which it cause to the fine sand and cement to go out from the mix  as a thin layer on the face of column with the cracks and those are not a deep but in any way its ( not acceptable ),,,  So when we are looking to the first picture we will find that the  right side is clear from dawn to the top but dawn ii more clare than up and the first thing you will see the joint  under the crushing part (( with a large number of voids))like sponge and the concrete is different than the the concrete under this joint  this indicate that the casting of column concreting was not cast  in the same time  and also the  shape and color of concrete also different and that is mean that we fail to get a good job and also we have a poor and bad concrete 

María Infante Chillón
par María Infante Chillón , Civil Engineer , Arco Studio

This kind of cracking isn’t accepted in construction because it will cause the collapse of the structure.

 

 

We can see this cracking when the vibration of the concrete is poor, so these kind of problems aren’t allowed in our career and we have to avoid it

 

 

Utilisateur supprimé
par Utilisateur supprimé

I think that  column shown in the picture is the long columns type and it cracked by buckling.

It is known that the bearing ability of column increases as loads was concentrated in the center of column section where the column was in critical condition and it undergoes  of refraction if the resultant of exerted loads being out by about one-third of middle  of columns section in square or rectangle columns, and if it got out of the middle quarter in the case of the column with a circular section .

I am afraid that this column has been subjected to conditions above and that the matter is not in lake of curing.

Utilisateur supprimé
par Utilisateur supprimé

Crack is governed by Shear force and not by moment here.

firstly check the crack width calculation permissible as per design and at site.

if still it is failing such provide splicing.

Sasa Stavric
par Sasa Stavric , Engineer Techinician , Kombinat

Not at all accepted.In my opinion this cracks because there is no care about curing stage,so we should care about curing stage for concrete and plasting.

jalal saleh
par jalal saleh , AREA MANAGER , BUHALEEBA CONTRACTING LLC

- not accepted at all >

- the joint in midle of the column is not accepted

- if this column is belong to new building , then the best isto make report to municiplity engineer to take action against cons. & contr.

hatem labib
par hatem labib , Quality control manager , MISER consultant

those horizontal cracks in columns is not accepted

as i see in the attached photos it is long column type which should have special design and should be concreted carefully to avoid segregation or cold joints.       

Alex Al Yazouri
par Alex Al Yazouri , General Manager , Al Mushref Cooperative Society

Unacceptable, possibly expired concrete or ratio of the ready mix is not correct.

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