rc design ce3060_intro2

Concrete

Cement

Aggregates

Concrete Mix Proportions

IS : 6461 (Part VII) - 19732.354 Workability -That property of freshly mixed concrete or mortar which determines the ease and homogeneity with which it can be mixed, placed, compacted, and finished. It is the amount of energy to overcome friction and cause full consolidation.

Nominal Mix Concrete

Design Mix Concrete

Properties of Concrete Compressive Strength

Tensile Strength

Modulus of Elasticity

Shrinkage of Concrete

Free Shrinkage, causes volume change, but no stresses

before shrinkage After Shrinkage

Restrained Shrinkage- creates stresses, which may cause cracking

Restrained shrinkage crackingParallel cracking perpendicularto the direction of shrinkage

Creep of Concrete

Thermal Expansion of Concrete

Durability of Concrete General Features

Freezing and Thawing

Exposure to Sulphate Attack

Fire Resistance, Corrosion & Cover

Requirements of RCC Members

Tables 16, 16A of IS:456-2000

A fire-resistance rating typically means the duration for which a passive fire protection system can withstand a standard fire resistance test. This can be quantified simply as a measure of time, or it may entail a host of other criteria, involving other evidence of functionality or fitness for purpose.

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