Answer / venu gopal

2 reasons for saging.1) bad staging/supports. 2) bad
design. any hw if it sagged it does noteffect the next slab
casting we can cast the next one. as far as repairing of
1st slab is consern we should have a graphical
representation of sag and find out the lowest level and
highest level plot them and with the help of this date we
can fix the floor level ilttle elevated than planned and
the sagged area should be concreted (screed concret) with
good mix as per site condition.

2.if it is a big footing we cannot remove and redo. so
remove the top 200mm concret by chiping and use proper
bonding agents and introduce few more rebars through the
coloun and anchor them to the old footing and change the
shape of the footing to a triangular shape with rebars and
re concrete the top surface and additional care to be taken
at the time of casting plinth beam it is better to redesign
the plinth beam to take more load which the coloum will
carry. Note. check the mix design and use skilled manpower
while casting cubes at site. also place them in water
immediately after removing from moulds (delay in this
activity will also cause cube failure)

Answer / ronak shah

i am completely aggre with venu gopal answer. if possible
the send me your personal e-mail id i want send to you
quary of civil engineering aspect which is arise in my mind.
my e-mail id (rd_shah13156@yahoo.co.in)

Answer / sujit

look if slab get sagged it better to be dismentaling and
construct new slab. by constructing new slab other floors
will not affect, because load carried by column.

your second question if cube result are below their
strength, as per is code it will better to be dismentaling.

37.18kg/qu.cm.Compressive Strength and 10.20% Water Absorption weight,Efflorescence-nil  this result use in construction work

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