WHAT IS AERATED CONCRETE? MANUFACTURING METHODS AND APPLICATION OF AERATED CONCRETE.

AERATED CONCRETE

The aerated concrete is made by introducing air or gas bubbles into the plastic cement mortar mix to produce a material with a cellular structure, Somewhat similar to sponge rubber. It is also known as Gas concrete or Cellular concrete. It is a mixture of cement, water and finely crushed sand.

The aerated concrete is different from air entrained concretes, though in both cases air is introduced into the material. Air entrained  concrete contains a much lower proportion of air and is in fact a heavy concrete whereas the amount of aeration is more in cellular concrete and it is light weight concrete.

The cellular concretes may or may not contain course aggregate. The densities generally range from 300 to 1000 kg/cu.m. Lower density grades are used per insulation purposes. Medium density grades are used for the manufacture of building blocks or load bearing walls and higher density grades are used in the manufacture of prefabricated structural members.

Aerated concrete can be manufactured in the following ways :

1. By the formation of gas by chemical reaction within the mass during liquid or plastic state:
Finely divided aluminium powder at the rate of 0.2 percent by weight of cement is added to cement. The aluminium powder reacts with calcium hydroxide and alkalies, liberated during hydration of cement, thus generating hydrogen gas.

2. By adding preformed stable form with the slurry :
A forming agent, usually a hydrolyzed protein or a resin soap is added during mixing of concrete and the mixture is mixed and worked at high speeds. 

3. By adding finely powdered expansive solid matter :
Expansive solid matters like pulverised sea weeds are stored in the water for 12 hours, leading to swelling of material to several times its original volume. The swelled material is added to sand and cement at the mixer. When the mortar sets and dries, Pores are produced by shrinkage of this material to the original volume.

Applications :



  1. As load bearing masonry walls using cellular concrete blocks.
  2. As partition walls in residential, institutional and industrial buildings.
  3. As precast composite wall or floor panel.
  4. As a filler wall in the form of precast reinforced wall panels in highrise buildings.
  5. As a precast floors and roof panels in all type of building.
  6. As insulation cladding to exterior walls of all types of building.

Comments

Popular Posts

TYPES OF CRACKS IN R.C.C COLUMNS

CHECKLIST FOR TERRACE WATERPROOFING (BRICK BAT COBA)

CLASSIFICATION OF STAIR AND THEIR USES