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Light Leca Block

Light weight aggregate concrete block:

Leca concrete is made by mixing of Leca aggregates, cement and Water. Adding sand into the mixture reduces the porous and Makes the concrete with Smoother surface. Adding of Sand decreases the volume of air in concrete and increases concrete strength.

This kind of block (with addition of sand) is called medium weight concrete block. When fine light weight aggregate is replaced by sand, workability goes high, water-cement Ratio decreases, and the strength of concrete increases.

Using Leca for non-bearing walls will reduce concrete weight and the thermal conductivity. With these particular and above specifications for Leca aggregates, following advantages can be expected from Leca Concrete:

  1. Lower weight
  2. Easy transportation
  3. Reduction of manpower and construction time for its lightness and easy- applying
  4. Easy for plastering on cellular texture and rough surface of the block
  5. Strength against imposed pressures
  6. Durable thermal insulation since the inside porous texture of aggregates and the air existing inside and among the aggregates
  7. Low coefficient of thermal conductivity
  8. Resistance against fire without producing toxic gases in firing
  9. Sound insulation with suitable coefficient of acoustical absorption
  10. Resistance against freezing and thawing cycles
  11. Impermeable against moisture
  12. Resistance against calcareous substances

 

Leca Gradation
( mm )

Mix
( 0 – 25 )

Fine
( 0 – 4 )

Mid
( 4 – 10 )

Density ( kg / m )

Max 430

Max 610

Max 430

Table. 1 Leca Aggregate Density

Compressive Strenght
(Min kg/cm)

Density (kg/m)

Block Weight (Max. kg)

Dimension
(mm)

Kinds of Block

Nominal Thickness (mm)

20

645

12

 

Bottom - close

200

20

625

5.7

 

Bottom - close

20

660

10

400*190*200

Bottom - close

45

930

17.3

490*190*200

Solid block

20

750

12

 

Bottom - close

175

20

670

9.5

 

Bottom - close

150

20

675

4.7

 

Bottom - close

25

785

9.2

 

Hollow block

120

20

750

8.5

590*100*200

Bottom - close

100

20

725

5.8

 

Bottom - close

45

970

4

 

Bottom - close

45

970

8

400*100*200

Solid block

45

970

9.5

490*100*200

Solid block

------

1090

1.2

 

Brick size

45

985

6.3

 

Solid block

80

 

Table. 2 Leca Light Weight Wall Blocks Specification

Test Reference (Aggregate Standard): Aggregate used in concrete blocks. Iran Standard No.7657

Test Reference: Non – load bearing light weight concrete blocks. Iran Standard No.7782

Notice :

Tolerance for height is ± 4 mm, length and width is ± 3 mm. Iran Standard No.7782According to Standard No. 7782, maximum density for hollow blocks is 700 kg / m and for solid blocks is 1000 kg / m

 

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