Efflorescence in cement is caused due to the excess of

The surface where two successive placements of concrete meet, is known as

Slump test is done for

The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be

Efflorescence in cement is caused due to an excess of

An aggregate which may contain some moisture in the pores but having dry surface is known as

Workability of concrete mix with low water cement ratio is determined by

Le-Chatelier's apparatus is used for testing