Types Of Concrete

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What is Concrete?
Concrete is a composite building material consist of aggregate bonded together with a fluidic cement which gets harden over time. Most use of the term "concrete" refers to Portland cement concrete or to concretes made with other hydraulic cements, such as ciment fondu. However, road surfaces are also a type of concrete, known as "asphaltic concrete", where the cement material is bitumen.

Types of Concrete:-
1. Normal concrete
2. High Strength Concrete
3. High Performance Concrete
4. Air Entrained Concrete
5. Light Weight Concrete
6. Self Compacting Concrete
7. Shotcrete
8. Pervious Concrete
9. Roller Compacted Concrete
Composition of Concrete:-
• Cement - Ordinary Portland Cement , Portland
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a) Used as structural concrete-Used to construct structural members such as Reinforced Cement Concrete ( RCC) and Pre-Stressed Concrete (PSC) members and
b) Used as a protection material to structural steel against fire – Primarily Plain Cement Concrete (PCC)
Material properties:-
1. Thermal Expansion:- Thermal expansion is the characteristics of matter to change in shape, area, and volume in relation to a change in temperature, through heat transfer.

There are four properties which play a vital role in thermal expansion of concrete:-
• The type of cement content in the concrete
• The type of aggregate, i.e Coarse, fine, carbonecious, silicious,etc.
• Water content in the concrete when there is change or deviation in temperature
• Age of concrete
Concrete has a positive coefficient of thermal expansion.
Which is an indication that when there is a rise in temperature, the thermal expansion of concrete increases.
However the rate of increase in thermal expansion is not linear.

2. Thermal Conductivity:- Thermal conductivity is defined as the quantity of heat that flows in one second through a cube of unit size and when the opposite faces of the cubes is maintained at a temperature difference of 1
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• The thermal diffusivity decreases with increase in temperature.

5. Compressive Strength of Concrete:-
 Compressive strength of concrete depends on the relative proportion of individual materials present in the concrete.
 Influence of temperature on the strength of concrete depends on the strength behaviour of various materials present in concrete as well.
 Concrete loses strength with increase in temperature.
 It is interesting to note that up to about 200 C, the reduction in the strength of concrete is nominal.
 On the other hand, when temperature reaches at 500 C and above, concrete starts deteriorating its strength rapidly.
 With the development of temperature in concrete, the ferric oxide present in aggregate becomes dehydrated or get reacted with lime present in cement paste.
 This results a color change in the concrete and the process is irreversible.
 The colour change occurs at a fairly well defined temperature as indicated below.
 up to about 300 C - There is no change in the colour of the concrete( normal colour is gray )
 at 300 C - Colour changes to Pink, Red or Reddish
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