Which of the following sentences is INCORRECT in the case of mortar?
1
Cement lime mortars are helpful in autogenously healing of cracks.
2
Even a small percentage of mica, if present, considerably lowers the tensile strength and adversely affects the compressive strength
3
There is a gain of compressive strength by the replacement of less than 25% of cement by hydrated lime.
4
It requires about twice as much cement to produce mortar of a given strength when fine sand is used as it does with coarse sand.