Reasons of Honeycombs in Concrete | Big Mistakes during Concrete Casting || By CivilGuruji
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- เผยแพร่เมื่อ 10 มิ.ย. 2021
- #CivilEngineer #CivilGuruji #Concrete #Honeycombing
Reasons of Honeycombs in Concrete | Big Mistakes during Concrete Casting
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In this video Er Sudeep Kumar Agrawal, Corporate Trainer of Civil Guruji Civil Engineers Training Institute is Explaining Reasons of Honeycombs in Concrete | Big Mistakes during Column Casting
Causes of Honeycombs in Concrete
Honeycomb is due to non-reaching of concrete to all places due to which cavities and hollow pockets are created, main reasons are:
Improper vibration during concrete.
:- Less cover to reinforcement bars
:- Use of very stiff concrete (this can be avoided by controlling water as per slump test).
:- Places like junction of beam to beam to column and to one or more beams are the typical spots where honeycombs are observed. This is due to jumbling of reinforcement of beams and column rods at one place; special attention is required at such place during concreting and vibrating.
:- Presence of more percentage of bigger size of aggregate in concrete also prevents concrete to fill narrow spaces between the reinforcement rods.
Reasons of Honeycombs in Concrete | Big Mistakes during Column Casting
Remedies for Honeycombs in Concrete
Strictly speaking wherever honeycombs are observed in concrete, the affected area should be broken and the portion should be re-concreted after applying grouting chemical to the old surface. Honeycombs as a defect not only reduces the load bearing capacity but water finds an easy way to reinforcement rods and rusting and corrosion starts. Corrosion is a process which continues through reinforcement rods even in good concrete, this result in losing grip between rods and concrete, which is very dangerous to safety and life of concrete structures. Reinforced concrete structures have failed within 20 or 30 years of their construction due to honeycombs, which is less than half their projected life. Especially no risk should be taken in case of columns, machine foundations, rafts, beams etc., where breaking and recasting is the only best way. In case of honeycombs on surface pressure grouting with cement based chemicals which are non-shrinkable can be adopted after taking opinion of the designer and acting as per his advice. It will not be out of context to point out that contractors and their supervisors are in the habit of hiding honeycombs by applying super facially cement plaster on the honeycombs, hence site engineer must be very cautious. At places of junction of columns and beams concrete with strictly 20mm and down aggregates should be used with slightly more water and cement to avoid honeycombs. Taping with wooden hammer the sides of shuttering from outside during concreting and vibrating will help minimizing honeycombs to a great extent in case of columns and beams. Use of thinner needle say 25mm or less with vibrator at intricate places of concreting will also help in reducing honeycombs.
Reasons of Honeycombs in Concrete | Big Mistakes during Column Casting
Best civil channel of entire TH-cam.
Weldone 🎉
Please make detailed video on formwork... Also tell about modern plastic panels for formwork
Hiii Civil Guruji Fam
Provide a Video on Productivity Labours
Very helpful knowledge
Thank you very much sir.
How many times can be use the scaffolding.
Good information which we ingnored in daily work and got wrong Results .
Thank you sir 😃
Foundation work me bearing capacity kese find krte hai and
Kese work ko initialised krte hai ?
Is pr ek video jarur banye.🙏
Pls make a video on formwork age.
👍
Sir formwork par vedio banayea
For sure.
Sir please make video on how many times we use shuttering ply
Sir aap ka har video ak achchha jankari deta hai sir agar honey com agya to iska kya tarika hai sahi karney ka ya thekedar to ciment balu ka motar bana kar lep yani ak tarah se us jagah ko bhar dete hai apney galti ko jaldi se chhupa deta hai
Thank You Very Much
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KEEP LEARING, KEEP SHARING.
Column clear cover provide or kept space 40 mm after vertical reinforcement or after stirrup..pls clear it .
Thank u very much
Have a good day sir
Prevention of honeycomb would have clarified in construct ability at site
Pls make a vdos on Shuttering
For sure you will get it on upcoming week.
So stay tuned.
Great Knowledge! Thank Very Much!
How can I take part in your online course! Please Guide...
Best Regards From Kathmandu, Nepal.
Shailesh Singh
Hello Shailesh ,
Glad the video is helpful for you.
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@@Civil_Guruji
Thank You very much for your reply and response ! Shall approach you very soon!
Best Regards!
Shailesh Singh 🙏🙏🙏
softwaer kaise sekhey online kaise instaal kare computer me or kha se
Long sa from bok kidnapped dinner takes chaltahe video do
Sir maine BBS advance ka individual course purchase kiya tha yesterday but course open nhi ho rha something went wrong message a rha h please check krke btaye sir
Hello Haris ,we will just check and solve asap .
You will get a call in few minutes.
@@Civil_Guruji ok sir
Sir ek bar me Kitni height tak concreting krna chahiye column or retaining wall me.
1.2m
@@dipankargogoi3998 thanku 😊
@@dipankargogoi3998 wrong you didn't get the question because he is not asking about concrete height he is asking about how much height we can cast (pour) in beam, column, footing in one time that is correct answer (300mm -500mm) and height of concreting falling (1.2m -1.5m) if i am not right then forgive me 🙏🙏
Maximum height 1.5 m
@@sadikali1986 thanku sadik bhai .....this is what i want to know
Plyboard shuttering - 4 times
Ms plate - 8 times
Mivan shuttering - 40 times
Ply atleast 10 times
Ms plate if not bend can be 50 minimum repetition
Mivan used for minimum 200 repetition
Please guys help me i m looking job as civil engineer fresher
Honeycomb is due to poor Compaction process
Solution nahi bataya