Question

The ratio of cement mortar used in the Collar joint is?

(a) 1:2

(b) 1:6

(c) 2:1

(d) 1:1

The question was asked in class test.

My query is from Joints and Shapes of Sewers and  Cleaning, Maintenance and Ventilation of Sewer in section Construction of Sewers, Sewer Appurtenances and Sewage Pumping of Environmental Engineering

Answer 1

The correct option is (a) 1:2

The best I can explain: In the Collar joint, the ratio of cement and mortar used is 1:1 in the space provided between the collar and the ends of the pipe.