Which of the below is not a filler material in filler slabs?

Which of the below is not a filler material in filler slabs? Correct Answer Rubber pieces

In R.C.C slabs, concrete in the lower portion does not help in anyway because it is weak in tension (bottom zone). Therefore, in filler slabs, it is replaced by certain filler materials, like coconut shells, burnt clary bricks, pots etc.

Related Questions

Statement (I): In resistance welding of sheet metal, filler rod is not used. Statement (II): It is the filler rod which gets oxidized and deposits the oxide in the weldment.
In which of the following joining process, the filler material used is the same as the parent material?
In which of the following joining process the filler material used is different as the parent material?