Classification of concrete

Concrete can be classified as follows:

Based on Cementing material

  1. Lime concrete
  2. Gypsum concrete
  3. Cement concrete

Based on Place of casting

  1. In situ concrete
  2. precast concrete

Based on Bulk density

  1. Heavy concrete
  2. Dense concrete
  3. Lightweight concrete
  4. Extra lightweight concrete

Based on Cementing material

  1. Lime concrete
  2. Gypsum concrete
  3. Cement concrete

Based on Perspective specifications

  • Nominal Mix

Nominal mix specifies the proportion of the cement , sand and aggregates without making special effort to know their individual properties. Nominal mix has Volumetric batching.

The proportions of materials for nominal mix shall be in accordance Grade Proportions C: FA: CA

 

Grade of concrete M5 M7.5 M10 M15 M20 M25
Mix proportion 1:5:10 1:4:8 1:3:6 1:2:4 1:1.5:3 1:1:2
Characteristic compressive strength 5 10 10 15 20 25

Based on Performance oriented specifications

  • Design mix concrete

( From M30 onwards we need to design the concrete mix)

The concrete mix produced under quality control keeping in view the strength, durability, and workability is called the design Mix.

• Others factors like compaction equipment’s available, curing method adopted, type of cement, quality of fine and coarse aggregate etc. have to be kept in mind before arriving at the mix proportion.

• The design mix or controlled mix is being used more and more in variety of important structures, because of better strength, reduced variability, leaner mixed with consequent economy, as well as greater assurance of the resultant quality.

Eg:- M30, M35, M40, M45, M50, M55 etc

Special concrete

Special concrete is defined as “concrete which meets special performance an uniformity requirements that cannot always be achieved routinely by using only conventional materials and normal mixing, placing and curing practices”.

TYPES OF SPECIAL CONCRETE

1. High Volume Fly Ash Concrete.

2. Silica fume concrete.

3. GGBS, Slag based concrete.

4. Ternary blend concrete.

5. Light weight concrete.

6. Polymer concrete.

7. Self Compacting Concrete.

8. Coloured Concrete.

9. Fibre-reinforced Concrete.

10. Pervious Concrete.

11. Water-proof Concrete.

12. Temperature Controlled Concrete.

 

 

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