Uses of Concrete
1. As bed concrete below column footings, wall footings, on wall at supports to beams 2. As sill concrete 3. […]
Concrete
Plain concrete, commonly known as concrete, is an intimate mixture of binding material, fine aggregate,
coarse aggregate and water. This can be easily moulded to desired shape and size before it looses
plasticity and hardens. Plain concrete is strong in compression but very weak in tension. The tensile
property is introduced in concrete by inducting different materials and this attempt has given rise to
RCC, RBC, PSC, FRC, cellular concrete and Ferro cement. In this chapter proportioning, mixing,
curing, properties, tests and uses of plain concrete is dealt in detail. The other improved versions of
concrete are explained and their special properties and uses are pointed out.
Tests on Concrete
The following are some of the important tests conducted on concrete: 1. Slump test. 2. Compaction factor test. 3. Crushing
Reinforced Cement Concrete (R.C.C.)
Concrete is good in resisting compression but is very weak in resisting tension. Hence reinforcement is provided in the concrete wherever
Reinforced Brick Concrete (RBC)
It is the combination of reinforcement, brick and concrete. It is well known fact that concrete is very weak in tension.
Properties of Hardened Concrete
Strength The characteristic strength of concrete is defined as the compressive strength of 150 mm size cubes after 28 days of
Properties of Concrete
Concrete has completely different properties when it is the plastic stage and when hardened. Concrete in the plastic stage is also
Properties of Green Concrete
Workability This is defined as the ease with which concrete can be compacted fully without seggregating and bleeding. It can
Prestressed Concrete (PSC)
Strength of concrete in tension is very low and hence it is ignored in R.C.C. design. Concrete in tension is acting
Preparing and Placing of Concrete
The following steps are involved in the concreting: 1. Batching 2. Mixing 3. Transporting and placing and 4. Compacting. 1.
Plain Concrete
Major ingredients of concrete are: 1. Binding material (like cement, lime, polymer) 2. Fine aggregate (sand) 3. Coarse aggregates (crushed