If t1=Time at which water is first added to cement, t2=Time when needle fails to penetrate 5 mm to 7 mm from bottom of the mould, t3=Time when the needle makes an impression but the attachment fails to do so, then what is initial setting time?
(a) t2-t1
(b) t2+t1
(c) t3-t1
(d) 2*t1
The question was posed to me during a job interview.
My question is from Setting Time Test in division Types of Cement and Testing of Cement of Concrete Technology