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Cold joints in RCC is permissible or not

Created by : Praphulla Kumar Shukla, Dy G M Civil, ABG Cement Ltd  | 12 31 2010 09:46:46 +0000
Keywords : cold joints in rcc is permissible or not
Activity:  705 views;  last activity : 01 10 2011 06:16:05 +0000
 
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Cold joints inRCC should not be allowed Vs Cold joints in RCC can be allowed
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As per standard engineering practice and good behaviour of concrete structure this should be avoided upto maximum extent, however it it is unavoidable situation it needs to be properly treatment of recommonded chemicals so component should act as monolathic strcture. Such joints are needed special attention prior to planning of mass concreting and such circumstances it can avoidable.
By RAVINDRA JAIN, Project Manager, STUP CONSULTANTS  01 04 2011 08:42:48 +0000
 
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RCC cold joints require special treatment in order to assure adequate bonding with the successive lift. Typical cold joint treatments include high pressure washing or wet sandblasting to remove mortar coatings, or other contaminants, followed by a high volume, low pressure washing and vacuuming to remove all excess water and debris. The surface is then maintained in a damp condition and covered with a thin layer of mortar or concrete bedding mix immediately before placing the next lift of RCC.
By Anjaneyula Reddy, Construction-Heavy, DLF  01 04 2011 05:36:01 +0000
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during the working it is sometime unable to complete the job or situation make it unable,so the these joint are made but we should always try to avoid these joints.
By nikhil sharma, Construction-Heavy, Larsen & Toubro Ltd  | 01 04 2011 10:52:28 +0000
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Nobody likes a cold joint but they happen. Here are several things one can do- 1- Try to avoid the cold joins in the middle/ other part as applicable of the structure where the load is high. 2-Let the rebar run about 50 cms to 90 cms out of the concrete at the joint so that it can tie up with further pour of concrete easily. 3-Form a keyway in concrete for subsequent pour of concrete , so that it may be locked. 4-Where one cannot reach leave a rough or uneven surface at initial pour. Ultimately a cold joint is a connection point between two pour of concretes.
By Brajesh Mishra, Construction / Contract Management, UPSSCL  | 01 04 2011 09:31:53 +0000
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Cold joints in RCC
By Praphulla Kumar Shukla, Dy G M Civil, ABG Cement Ltd  | 12 31 2010 09:46:46 +0000
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I agree with Mr.Ghosh, wecan not avoid the cold joints because of some obuvious practical reasons.but the possitions of such joints is very very important & beam-column joints are the most carelessly concreted parts.It is advoicable to provide cold joints away from the junctions & with propper care as elaborated by Anjaneyula Reddy....
By MAYUR MASKE, Lecturer, S.I.T. YADRAV  | 01 10 2011 06:16:05 +0000
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We come across various joints especially contraction,expansion or construction joints these joints are unavoidable,but cold joints are avoidable,because it happens in sub structure,within initial setting of concrete and also in mass concreting.By providing Admixtures,Grouting method by using Epoxy resin ,inserting cold twisted bars in ribbed portin but not by sand plastering method,but in thin structures like slabs we are following weathering courses in new proofing method doing multiple plastering using various chemical compounds
By VIMALAN , Construction-Construction Management, PARSVNATH DEVELOPERS LTD  | 01 09 2011 06:57:18 +0000
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Most of you, who have constructed buildings, have built a column lift and then laid the shuttering and reinforcement for the upper floor slab and beams. Then after several days you have poured concrete for the floor. What is the joint between the column neck and the beam but a cold joint? Cold joints are inevitable in concrete construction, only one has to deliberately select the location and take adequate measures to minimise the effect of this discontinuity. Only in some specifically importnt cases one has to try and avoid cold joints, like foundations for vibrating machinery. In all cases of cold joints, it is imperative to prepare the hardened concrete surface properly before pouring fresh concrete to join with it. It is also true that large flat surface construction is not possible without providing construction joints at regular intervals. For vast expanses of such construction, one has to plan for contraction and expansion joints at design stage. Regards
By Basab Ghosh, General Manager (Operations), Saipem India Project Ltd.  | 01 04 2011 17:46:10 +0000
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without which big construction is not possible, and if done it will crack
By sanjeev , Construction-General Building, lodha  | 01 04 2011 06:30:52 +0000
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Cold joint cannot be totally avoided at all.Special bonding agents are avialable in the market which can be used though it is ideal to avoid cold joints as far as practicable.
By Prabhakar Krishnamurthy, Chief Operating officer, LT Arun Excello Reality Pvt Ltd.  | 01 04 2011 06:17:17 +0000
Argue for "Cold joints inRCC should not be allowed "
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