Unit 1
Materials: cement – different types – chemical composition and physical properties – tests on cement – I.S. specifications – aggregates – classification – mechanical properties and tests as per I.S. – alkali aggregate reaction – grading requirements – heavy weight – light weight – normal weight – aggregate – sampling of aggregate – water – quality of water – admixtures – accelerators – retarders – water reducing agents – super plasticizers- use of silica fumes.
Properties of fresh concrete – workability – factors affecting workability – tests for workability – segregation and bleeding.
Unit 2
Properties of hardened concrete – factors affecting strength of concrete – strength of concrete in compression, tension and flexure – stress- strain characteristics and elastic properties – shrinkage and creep – durability of concrete – permeability – chemical attack – sulphate attack – resistance to abrasion and cavitation – resistance to freezing and thawing – resistance to fire – marine atmosphere – quality control – frequency of sampling – test specimens – statistical analysis of test results – standard deviation – acceptance criteria.
Manufacture of concrete – measurement of materials – storage and handling – batching plant and equipment – mixing – types of mixers – transportation of concrete – pumping of concrete – placing of concrete – under water concreting – compaction of concrete – curing of concrete – ready mix concrete.
