UNIT – III
HARDENED CONCRETE : WATER / CEMENT RATIO –
ABRAM’S LAW – GELSPAOE RATIO – NATURE OF
STRENGTH OF CONCRETE – MATURITY CONCEPT –
STRENGTH IN TENSION & COMPRESSION – FACTORS
AFFECTING STRENGTH – RELATION BETWEEN
COMPRESSION & TENSILE STRENGTH – CURING.
TESTING OF HARDENED CONCRETE: COMPRESSION
TESTS – TENSION TESTS – FACTORS
AFFECTING STRENGTH – FLEXURE TESTS – SPLITTING
TESTS – PULL-OUT TEST, NONDESTRUCTIVE
TESTING METHODS – CODAL PROVISIONS FOR NDT.
ELASTICITY, CREEP & SHRINKAGE – MODULUS OF
ELASTICITY – DYNAMIC MODULUS OF ELASTICITY –
POSISSON’S RATIO – CREEP OF CONCRETE – FACTORS
INFLUENCING CREEP – RELATION BETWEEN CREEP &
TIME – NATURE OF CREEP – EFFECTS
OF CREEP – SHRINKAGE – TYPES OF SHRINKAGE